KR20230110234A - Display device - Google Patents

Abstract

A display device according to one embodiment of the present invention comprises: a display panel in which a plurality of pixels are defined; a back cover supporting the display panel on a back surface of the display panel and having a through hole disposed thereon; a plurality of flexible films electrically connected to one end of the display panel and disposed on one surface of the back cover; a source printed circuit board electrically connected to the plurality of flexible films and disposed on one surface of the back cover; a control printed circuit board electrically connected to the source printed circuit board and disposed on the opposite surface of one surface of the back cover; and a flexible cable electrically connecting the source printed circuit board and the control printed circuit board through the through hole. Therefore, by disposing the control printed circuit board outside a roller, the heat dissipation effect of the control printed circuit board may be improved, and the reliability of the display device may be secured.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a rollable display device capable of displaying an image even when rolled.

Display devices used in computer monitors, TVs, mobile phones, etc. include organic light emitting displays (OLEDs) that emit light by themselves, and liquid crystal displays (LCDs) that require a separate light source.

The range of applications of display devices is diversifying from computer monitors and TVs to personal portable devices, and research into display devices having a reduced volume and weight while having a large display area is being conducted.

In addition, recently, a rollable display device manufactured to display an image even when rolled by forming a display unit and wires on a flexible substrate such as plastic, which is a flexible material, is attracting attention as a next-generation display device.

An object to be solved by the present invention is to provide a display device including a back cover having high flexibility so as to be rolled together with a display panel.

Another problem to be solved by the present invention is to provide a display device in which the control printed circuit board can be easily repaired by arranging the control printed circuit board outside the roller.

Another problem to be solved by the present invention is to provide a display device in which the control printed circuit board is disposed outside the roller to improve the heat dissipation effect of the control printed circuit board.

Another problem to be solved by the present invention is to provide a display device capable of reducing the size of the display device by reducing the diameter of the roller by arranging a control printed circuit board outside the roller.

Another problem to be solved by the present invention is to provide a display device in which a flexible cable is not visually recognized from the rear surface of a display panel.

Another object to be solved by the present invention is to provide a display device capable of minimizing noise of a signal transmitted through the flexible cable by reducing the length of the flexible cable.

Another problem to be solved by the present invention is to provide a display device capable of minimizing damage to a control printed circuit board and a source printed circuit board.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, a display device according to an embodiment of the present invention includes a display panel in which a plurality of pixels are defined, a back cover supporting the display panel on the rear surface of the display panel, and having through-holes disposed thereon, electrically connected to one end of the display panel, and electrically connected to a plurality of flexible films disposed on one surface of the back cover, electrically connected to a source printed circuit board disposed on one surface of the back cover, and electrically connected to the source printed circuit board, and disposed on a side opposite to one surface of the back cover. and a flexible cable electrically connecting the source printed circuit board and the control printed circuit board through the control printed circuit board and the through hole. Therefore, by disposing the control printed circuit board outside the roller, the heat dissipation effect of the control printed circuit board can be improved and the reliability of the display device can be secured.

In order to solve the above problems, a display device according to another embodiment of the present invention includes a display panel, a plurality of source printed circuit boards electrically connected to the display panel, a back cover supporting the display panel and the plurality of source printed circuit boards and including a through hole and a plurality of openings, a roller on which the display panel and the back cover are wound or unwound, a flat portion and a curved portion, a control printed circuit board electrically connected to the plurality of source printed circuit boards, and disposed outside the roller, and a plurality of source printed circuit boards and a control printed circuit board. and includes a plurality of flexible cables that are connected to each other and pass through the through hole. Accordingly, the diameter of the roller can be reduced by disposing the control printed circuit board outside the roller, and the size of the display device can be reduced.

Other embodiment specifics are included in the detailed description and drawings.

The present invention can provide a back cover having high flexibility by arranging a plurality of openings in the back cover.

According to the present invention, since the control printed circuit board is disposed outside the roller, only the control printed circuit board can be easily replaced or repaired without completely disassembling the roller of the display device.

According to the present invention, heat generated from the control printed circuit board can be effectively dissipated by disposing the control printed circuit board outside the roller.

According to the present invention, the volume of the display device can be reduced by reducing the size of the roller.

According to the present invention, signal noise can be reduced by reducing the length of the flexible cable.

According to the present invention, damage due to bending of the control printed circuit board and the source printed circuit board can be minimized by always keeping the control printed circuit board and the source printed circuit board flat regardless of winding or unwinding the display device.

Effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present invention.

1A and 1B are perspective views of a display device according to an exemplary embodiment of the present invention.
2 is an exploded perspective view of a display device according to an exemplary embodiment of the present invention.
3 is a schematic cross-sectional view illustrating a head bar and a display unit of a display device according to an exemplary embodiment.
4 is a cross-sectional view of a display device according to an exemplary embodiment.
5 is a plan view of a display unit of a display device according to an exemplary embodiment of the present invention.
FIG. 6 is a cross-sectional view taken along line VI-VI' of FIG. 5 .
7 is a plan view of a back cover in a display device according to an exemplary embodiment of the present invention.
FIG. 8 is an enlarged view of area A of FIG. 7 .
9A is a cross-sectional view of a display device according to an exemplary embodiment.
9B is an enlarged view of area B of FIG. 9A.
9C is a cross-sectional view of a display device according to an exemplary embodiment.
9D is a cross-sectional view of a display device according to an exemplary embodiment.
10 is a plan view of a display unit of a display device according to another exemplary embodiment of the present invention.
11 is a cross-sectional view taken along line XI-XI' in FIG. 10;
12 is a perspective view of a roller in a display device according to another exemplary embodiment of the present invention.
13 is a schematic exploded perspective view illustrating winding of a source cover part and a control cover part of a display device according to another embodiment of the present invention around a roller.
14 is a schematic perspective view illustrating winding of a back cover of a display device according to another embodiment of the present invention around a roller.
15 is a top plan view of a back cover in a display device according to another embodiment of the present invention.

The advantages and features of the present invention, and how to achieve them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different shapes, and only these embodiments make the disclosure of the present invention complete, and those skilled in the art are provided to fully inform the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, and the present invention is not limited thereto. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists', etc. mentioned in the present invention is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, when the positional relationship of two parts is described as 'on ~', 'upon ~', 'on ~ below', 'next to', etc., one or more other parts may be located between the two parts unless 'directly' or 'directly' is used.

When an element or layer is referred to as “on” another element or layer, it includes all cases where another element or layer is directly on top of another element or another layer or other element intervenes therebetween.

In addition, although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numbers designate like elements throughout the specification.

The area and thickness of each component shown in the drawings is shown for convenience of description, and the present invention is not necessarily limited to the area and thickness of the illustrated component.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Display Device - Rollable Display Device>

First, a rollable display device may be referred to as a display device capable of displaying an image even when rolled. A rollable display device may have high flexibility compared to conventional general display devices. Depending on whether or not the rollable display device is used, the shape of the rollable display device can be freely changed. Specifically, when the rollable display device is not in use, the rollable display device may be rolled up to reduce its volume and stored. Conversely, when using a rollable display device, the rolled rollable display device may be unfolded and used again.

1A and 1B are perspective views of a display device according to an exemplary embodiment of the present invention. Referring to FIGS. 1A and 1B , a display device 100 according to an exemplary embodiment includes a display part DP and a housing part HP.

The display unit DP is a component for displaying an image to a user, and for example, a display element and a circuit, wiring, and parts for driving the display element may be disposed. In this case, since the display device 100 according to an embodiment of the present invention is a rollable display device 100, the display unit DP may be configured to be wound and unwinded. For example, the display unit DP may include a display panel and a back cover that have flexibility to be wound or unwound. A more detailed description of the display unit DP will be described later with reference to FIGS. 5 and 6 .

The housing part HP is a case in which the display part DP can be accommodated. The display part DP may be wound and stored inside the housing part HP, and the display part DP may be unwound and disposed outside the housing part HP.

An opening HPO is disposed in the housing part HP so that the display part DP can move inside and out of the housing part HP. The display unit DP may move vertically through the opening HPO of the housing unit HP.

Meanwhile, the display unit DP of the display device 100 may be converted from a full unwinding state to a full winding state or from a full winding state to a full unwinding state.

1A shows a state in which the display unit DP of the display device 100 is fully unwound, and the fully unwinded state is a state in which the display unit DP of the display device 100 is disposed outside the housing unit HP. That is, in order for the user to watch an image through the display device 100, the display unit DP is unwinded and placed outside the housing unit HP as much as possible, and a state in which unwinding is no longer possible can be defined as a full unwinding state.

1B shows a state in which the display unit DP of the display device 100 is fully wound, and the fully wound state is a state in which the display unit DP of the display device 100 is housed in the housing unit HP and cannot be further wound. That is, when the user does not watch an image through the display device 100, it is advantageous in terms of appearance that the display unit DP is not disposed outside the housing unit HP. Therefore, a state in which the display unit DP is wound and accommodated inside the housing unit HP can be defined as a full winding state. In addition, when the display unit DP is housed in the housing unit HP in a fully wound state, the display device 100 has a small volume and can be easily transported.

Meanwhile, a driving unit winding or unwinding the display unit DP is disposed to convert the display unit DP to a fully unwound state or a fully wound state.

<Drive unit>

2 is an exploded perspective view of a display device according to an exemplary embodiment of the present invention. 3 is a schematic cross-sectional view illustrating a head bar and a display unit of a display device according to an exemplary embodiment. 4 is a cross-sectional view of a display device according to an exemplary embodiment. 4 is a schematic cross-sectional view illustrating the roller 171 and the display unit DP of the display device 100 according to an exemplary embodiment. For convenience of explanation, only the head bar 184 and the display unit DP are shown in FIG. 3 , and only the housing unit HP, the roller 171 and the display unit DP are shown in FIG. 4 .

First, referring to FIG. 2 , the driving unit MP includes a roller unit 170 and a lifting unit 180 .

The roller unit 170 rotates in the first direction DR1 or the second direction DR2 and winds or unwinds the display unit DP fixed to the roller unit 170 . The roller unit 170 includes a roller 171 , a roller support unit 172 and a roller rotating unit 173 .

The roller 171 is a member around which the display unit DP is wound. The roller 171 may have, for example, a cylindrical shape in which at least a portion of the outer circumferential surface is formed of a flat surface and the remaining portion of the outer circumferential surface is formed of a curved surface. The flat portion of the roller 171 is a portion on which the flexible film of the display unit DP and the source printed circuit board are seated, and will be described later with reference to FIGS. 9A to 9C .

A lower edge of the display unit DP may be fixed to the roller 171 . When the roller 171 rotates, the display unit DP having the lower edge fixed to the roller 171 may be wound around the roller 171 . On the other hand, when the roller 171 rotates in the opposite direction, the display unit DP wound around the roller 171 may be unwound from the roller 171 .

Referring to FIG. 4 , the roller 171 has a cylindrical shape as a whole, but a portion thereof may be made of a flat surface. That is, a part of the outer circumferential surface of the roller 171 is formed flat, and the remaining part of the outer circumferential surface is formed as a curved surface. However, it is not limited thereto, and the roller 171 may have a completely cylindrical shape or an arbitrary shape capable of winding the display unit DP, but is not limited thereto.

The roller support 172 supports the roller 171 on both sides of the roller 171 . Specifically, the roller support part 172 is disposed on the bottom surface HPF of the housing part HP. And the top side of the roller support 172 is coupled to both ends of the roller 171. Thus, the roller support part 172 may support the roller 171 to be spaced apart from the bottom surface HPF of the housing part HP. At this time, the roller 171 may be rotatably coupled to the roller support 172 .

The roller rotation unit 173 may rotate the roller 171 in the first direction DR1 or the second direction DR2. A roller rotation unit 173 may be disposed on each of the pair of roller support units 172 . For example, the roller rotation unit 173 may be a rotation motor that transmits rotational force to the roller 171, but is not limited thereto.

The lifting unit 180 moves the display unit DP in the vertical direction according to the driving of the roller unit 170 . The elevation unit 180 includes a link support unit 181 , a link unit 182 , a link elevation unit 183 and a head bar 184 .

The link support part 181 supports the link part 182 and the link elevation part 183 . Specifically, the link support part 181 may support the link part 182 moving in the vertical direction so that the display part DP does not collide with the boundary of the opening part HPO of the housing part HP. The link support part 181 may support the link part 182 and the display part DP so that they can move only in the vertical direction without moving in the forward and backward directions.

The link unit 182 includes a plurality of links 182L hinged to each other. Each of the plurality of links 182L is rotatably hinged to each other and can be moved in the vertical direction by the link lifting unit 183 . When the link unit 182 moves in the vertical direction, each of the plurality of links 182L may rotate in a direction in which each of the links 182L moves away from or approaches each other. A detailed description of this will be described later with reference to FIG. 4 .

The link lifting unit 183 may move the link unit 182 in the vertical direction. The link lifting unit 183 may rotate each of the plurality of links 182L of the link unit 182 to come closer to each other, or rotate each of the plurality of links 182L to move away from each other. The link lifting unit 183 may raise or lower the link unit 182 so that the display unit DP connected to the link unit 182 is raised or lowered.

At this time, the link lifting unit 183 is driven in synchronization with the roller rotation unit 173, so that the roller unit 170 and the lifting unit 180 can operate simultaneously. For example, when the display unit DP is converted from a fully unwound state to a fully wound state, the roller unit 170 operates to wind the display unit DP around the roller 171, and at the same time, the lifting unit 180 rotates the plurality of links 182L of the link unit 182 to lower the display unit DP. In addition, when the display unit DP is converted from a full-wound state to a fully unwound state, the roller unit 170 operates to unwind the display unit DP from the roller 171, and at the same time, the lifting unit 180 rotates the plurality of links 182L of the link unit 182 to raise the display unit DP.

The head bar 184 of the elevating unit 180 is fixed to the top of the display unit DP. The head bar 184 is connected to the link unit 182 to move the display unit DP in the vertical direction according to the rotation of the plurality of links 182L of the link unit 182 . That is, the display unit DP may move vertically by the link unit 182 and the link lifting unit 183 by the head bar 184 .

Referring to FIG. 3 together, the head bar 184 is disposed at the top of the display unit DP to cover the front and rear surfaces of the display unit DP.

The head bar 184 includes a first head bar 184a and a second head bar 184b. The first head bar 184a covers the front of the display unit DP. The first head bar 184a covers only a part of the front surface adjacent to the uppermost edge of the display unit DP so as not to block the image displayed in front of the display unit DP.

The second head bar 184b covers the rear surface of the display unit DP. The second head bar 184b covers a portion of the rear surface adjacent to the uppermost edge of the display unit DP. However, since an image is not displayed on the rear surface of the display unit DP, the second head bar 184b may overlap the display unit DP more than the first head bar 184a.

To fasten the display unit DP to the first head bar 184a and the second head bar 184b, a first fastening hole AH1 may be formed in the display unit DP. Further, the screw SC may pass through the first fastening hole AH1 and fasten the first head bar 184a, the display unit DP, and the second head bar 184b.

The second head bar 184b is provided with a palm nut PN to which the link unit 182 of the elevation unit 180 is fastened. The second head bar 184b and the link part 182 of the elevation part 180 may be fastened by the fem nut PN. Therefore, when the link part 182 of the lifting part 180 moves in the vertical direction, the second head bar 184b fastened to the link part 182, the first head bar 184a fastened to the second head bar 184b, and the display unit DP can move in the vertical direction together.

Meanwhile, in FIG. 3, the first head bar 184a and the second head bar 184b are illustrated as having a straight line shape, but the shapes of the first head bar 184a and the second head bar 184b may be variously changed, but are not limited thereto.

Hereinafter, a driving operation of the driver MP will be described in detail with reference to FIG. 4 .

Referring to FIG. 4 together, the lower edge of the display unit DP is connected to the roller 171 . When the roller 171 is rotated in the first direction DR1, that is, clockwise, by the roller rotating unit 173, the display unit DP may be wound around the roller 171 such that the rear surface of the display unit DP comes into close contact with the surface of the roller 171.

Conversely, when the roller 171 rotates in the second direction DR2, that is, counterclockwise, by the roller rotation unit 173, the display unit DP wound around the roller 171 is unwound from the roller 171 and may be disposed outside the housing unit HP.

In some embodiments, a driving unit MP having a structure other than the driving unit MP described above may be applied to the display device 100 . That is, if the display unit DP can be wound and unwound, the above-described configurations of the roller unit 170 and the elevation unit 180 may be changed, some components may be omitted, and other configurations may be added.

<Display part>

5 is a plan view of a display unit of a display device according to an exemplary embodiment of the present invention. FIG. 6 is a cross-sectional view along line VI-VI′ of FIG. 5 . In FIG. 5 , for convenience of description, the control printed circuit board 160 and the source cover 140c of the display unit DP are omitted, and only the back cover 110, the display panel 120, the flexible film 130, the source printed circuit board 140, and the flexible cable 150 are shown.

Referring to FIG. 5 , the display unit DP includes a back cover 110 , a display panel 120 , a flexible film 130 , a source printed circuit board 140 , and a flexible cable 150 .

The display panel 120 is a panel for displaying an image to a user. The display panel 120 may include a display element for displaying an image, a driving element for driving the display element, and wires for transmitting various signals to the display element and the driving element. The display element may be defined differently depending on the type of display panel 120. For example, when the display panel 120 is an organic light emitting display panel, the display element may be an organic light emitting element including an anode, an organic light emitting layer, and a cathode. For example, when the display panel 120 is a liquid crystal display panel, the display element may be a liquid crystal display element. Hereinafter, it is assumed that the display panel 120 is an organic light emitting display panel, but the display panel 120 is not limited to the organic light emitting display panel. Also, since the display device 100 according to an exemplary embodiment of the present invention is a rollable display device, the display panel 120 may be implemented as a flexible display panel to be wound or unwound around the roller 171 .

The display panel 120 includes a display area AA and a non-display area NA.

The display area AA is an area where an image is displayed on the display panel 120 . A plurality of sub-pixels and a circuit for driving the plurality of sub-pixels may be disposed in the display area AA. A plurality of sub-pixels is a minimum unit constituting the display area AA, and a display element may be disposed in each of the plurality of sub-pixels. For example, an organic light emitting element including an anode, an organic light emitting layer, and a cathode may be disposed in each of the plurality of sub-pixels, but is not limited thereto. In addition, a circuit for driving a plurality of sub-pixels may include driving elements and wires. For example, the circuit may include, but is not limited to, a thin film transistor, a storage capacitor, a gate line, and a data line.

The non-display area NA is an area in which an image is not displayed. In the non-display area NA, various wires and circuits for driving the organic light emitting elements of the display area AA are disposed. For example, a link wire or driving IC such as a gate driver IC or a data driver IC may be disposed in the non-display area NA, but is not limited thereto.

The flexible film 130 is a film in which various parts are disposed on a flexible base film. In detail, the flexible film 130 is a film for supplying signals to a plurality of sub-pixels and circuits of the display area AA, and may be electrically connected to the display panel 120 . The flexible film 130 is disposed on one end of the non-display area NA of the display panel 120 to supply power voltages and data voltages to a plurality of sub-pixels and circuits in the display area AA. Although FIG. 5 shows that there are eight flexible films 130, the number of flexible films 130 may be variously changed according to design, but is not limited thereto.

Meanwhile, a driving IC such as, for example, a gate driver IC and a data driver IC may be disposed on the flexible film 130 . The driving IC is a component that processes data for displaying an image and a driving signal for processing the data. The driving IC may be disposed in a manner such as a chip on glass (COG), a chip on film (COF), or a tape carrier package (TCP) depending on a mounting method. However, for convenience of description, it has been described that the driving IC is mounted on the flexible film 130 in a chip-on-film method, but is not limited thereto.

The source printed circuit board 140 is disposed on one end of the flexible film 130 and connected to the flexible film 130 . The source printed circuit board 140 is a component that supplies signals to the driving IC. The source printed circuit board 140 supplies various signals such as driving signals and data signals to the driving IC. For example, a data driver for generating data signals may be mounted on the source printed circuit board 140, and the generated data signals may be supplied to a plurality of sub-pixels and circuits of the display panel 120 through the flexible film 130. Meanwhile, although the number of source printed circuit boards 140 is illustrated in FIG. 5 as four, the number of source printed circuit boards 140 may be variously changed according to design, but is not limited thereto.

A flexible cable 150 electrically connected to one end of the source printed circuit board 140 is disposed. The flexible cable 150 passes through the through hole 112 of the back cover 110 and extends to the side opposite to one side of the back cover 110 . The flexible cable 150 is for electrically connecting the source printed circuit board 140 and the control printed circuit board 160, and the flexible cable 150 and the control printed circuit board 160 will be described later in detail with reference to FIGS. 9A to 9D.

The back cover 110 is disposed on the rear surface of the display panel 120, the flexible film 130, and the source printed circuit board 140, and supports the display panel 120, the flexible film 130, and the source printed circuit board 140. Accordingly, the area of the back cover 110 may be larger than that of the display panel 120 . The back cover 110 may protect other components of the display unit DP from the outside. The back cover 110 is formed of a material having rigidity, but at least a portion of the back cover 110 may have flexibility to be wound or unwound together with the display panel 120 . For example, the back cover 110 may be made of a metal material such as SUS (Steel Use Stainless) or Invar, or a material such as plastic. However, the material of the back cover 110 may be variously changed as long as it satisfies physical property conditions such as thermal deformation amount, radius of curvature, and stiffness according to design, but is not limited thereto.

Referring to FIG. 6 , the display panel 120 includes a substrate 121 , a buffer layer 122 , a pixel unit 123 , an encapsulation layer 124 , and an encapsulation substrate 125 .

The substrate 121 is a base member for supporting various components of the display panel 120 and may be made of an insulating material. The substrate 121 is used for winding or unwinding the display panel 120 . It may be made of a material having flexibility, for example, it may be made of a plastic material such as polyimide (PI).

The buffer layer 122 may prevent diffusion of moisture and/or oxygen penetrating from the outside of the substrate 121 . The buffer layer 122 may be composed of a single layer or a double layer of silicon oxide (SiOx) and silicon nitride (SiNx), but is not limited thereto.

The pixel unit 123 includes a plurality of organic light emitting elements and a circuit for driving the organic light emitting elements. The pixel unit 123 may be an area corresponding to the display area AA. The organic light emitting element may include an anode, an organic light emitting layer, and a cathode.

The anode may supply holes to the organic light emitting layer and may be made of a conductive material having a high work function. For example, the anode may be made of tin oxide (TO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (ITZO), and the like, but is not limited thereto.

The organic light emitting layer may emit light by receiving holes from the anode and electrons from the cathode. The organic light emitting layer may include a red organic light emitting layer, a green organic light emitting layer, a blue organic light emitting layer, and a white organic light emitting layer according to the color of light emitted from the organic light emitting layer. In this case, when the organic light emitting layer is a white organic light emitting layer, color filters of various colors may be additionally disposed.

The cathode may supply electrons to the organic light emitting layer and may be made of a conductive material having a low work function. For example, the cathode may be made of at least one selected from the group consisting of metals such as magnesium (Mg), silver (Ag), aluminum (Al), and alloys thereof, but is not limited thereto.

Meanwhile, depending on the direction in which light emitted from the organic light emitting device is emitted, the display panel 120 may be configured in a top emission or bottom emission method.

The top emission method is a method in which light emitted from the organic light emitting device is emitted to the top of the substrate 121 on which the organic light emitting device is formed. In the case of the top emission method, a reflective layer may be formed under the anode to propagate light emitted from the organic light emitting device to the top of the substrate 121, that is, to the cathode side.

The bottom emission method is a method in which light emitted from an organic light emitting device is emitted from a lower portion of the substrate 121 on which the organic light emitting device is formed. In the case of the bottom emission method, the anode may be made of only a transparent conductive material, and the cathode may be made of a metal material having high reflectance in order to propagate light emitted from the organic light emitting device to the lower portion of the substrate 121 .

Hereinafter, for convenience of explanation, description will be made on the assumption that the display device 100 according to an embodiment of the present invention is a bottom emission type display device, but is not limited thereto.

A circuit for driving an organic light emitting element is disposed in the pixel unit 123 . The circuit may include a thin film transistor, a storage capacitor, a gate line, a data line, a power line, and the like, but may be variously changed according to the design of the display device 100 .

An encapsulation layer 124 covering the pixel portion 123 is disposed on the pixel portion 123 . The encapsulation layer 124 seals the organic light emitting element of the pixel unit 123 . The encapsulation layer 124 may protect the organic light emitting element of the pixel unit 123 from external moisture, oxygen, impact, and the like. The encapsulation layer 124 may be formed by alternately stacking a plurality of inorganic layers and a plurality of organic layers. For example, the inorganic layer may be made of an inorganic material such as silicon nitride (SiNx), silicon oxide (SiOx), or aluminum oxide (AlOx), and the organic layer may be an epoxy-based or acrylic-based polymer, but is not limited thereto.

An encapsulation substrate 125 is disposed on the encapsulation layer 124 . The encapsulation substrate 125 protects the organic light emitting element of the pixel unit 123 together with the encapsulation layer 124 . The encapsulation substrate 125 may protect the organic light emitting element of the pixel unit 123 from external moisture, oxygen, impact, and the like. The encapsulation substrate 125 has strong corrosion resistance and is easy to process in the form of a foil or thin film. It may be made of a metal material such as aluminum (Al), nickel (Ni), chromium (Cr), or an alloy of iron (Fe) and nickel. Thus, as the encapsulation substrate 125 is formed of a metal material, the encapsulation substrate 125 can be implemented in the form of an ultra-thin film, and protection against external impact and scratches can be provided.

A first adhesive layer AD1 may be disposed between the encapsulation layer 124 and the encapsulation substrate 125 . The first adhesive layer AD1 may adhere the encapsulation layer 124 and the encapsulation substrate 125 . The first adhesive layer AD1 is made of an adhesive material and may be a heat-curable or natural-curable adhesive. For example, the first adhesive layer AD1 may be formed of optical clear adhesive (OCA) or pressure sensitive adhesive (PSA), but is not limited thereto.

Meanwhile, the first adhesive layer AD1 may be disposed to surround the encapsulation layer 124 and the pixel unit 123 . That is, the pixel unit 123 may be sealed by the buffer layer 122 and the encapsulation layer 124, and the encapsulation layer 124 and the pixel unit 123 may be sealed by the buffer layer 122 and the first adhesive layer AD1. The first adhesive layer AD1 together with the encapsulation layer 124 and the encapsulation substrate 125 may protect the organic light emitting element of the pixel unit 123 from external moisture, oxygen, impact, and the like. In this case, the first adhesive layer AD1 may further include a moisture absorbent. The desiccant may be a particle having hygroscopicity, and may absorb moisture and oxygen from the outside, thereby minimizing penetration of moisture and oxygen into the pixel unit 123 .

A back cover 110 is disposed on the encapsulation substrate 125 . The back cover 110 may be disposed to contact the encapsulation substrate 125 of the display panel 120 to protect the display panel 120 . The back cover 110 may be formed of a material having rigidity to protect the display panel 120 .

Meanwhile, the back cover 110 includes a plurality of openings 111 . The plurality of openings 111 may allow the back cover 110 to have flexibility. The plurality of openings 111 can be flexibly deformed, and the back cover 110 can be wound around the roller 171 together with the display panel 120 or unwound from the roller 171 . A detailed description of this will be described later with reference to FIGS. 8A and 8B.

A second adhesive layer AD2 is disposed between the encapsulation substrate 125 and the back cover 110 . The second adhesive layer AD2 may adhere the encapsulation substrate 125 and the back cover 110 . The second adhesive layer AD2 is made of an adhesive material and may be a heat-curable or natural-curable adhesive. For example, the second adhesive layer AD2 may be formed of optical clear adhesive (OCA) or pressure sensitive adhesive (PSA), but is not limited thereto.

In FIG. 6, it is shown that the second adhesive layer AD2 is not filled in the plurality of openings 111 of the back cover 110, but the second adhesive layer AD2 is the plurality of openings 111 of the back cover 110. Some or all of them may be filled. If the second adhesive layer AD2 is filled inside the plurality of openings 111 of the back cover 110, the contact area between the second adhesive layer AD2 and the back cover 110 increases, so that the peeling phenomenon can be prevented.

Meanwhile, although not shown in FIG. 6 , a light-transmitting film may be further disposed on the rear surface of the substrate 121 . The light-transmitting film may perform functions such as protecting the front surface of the display panel 120 or minimizing reflection of external light incident on the display panel 120 . For example, the light transmitting film may be at least one of a polyethyleneterephthalate (PET) film, an antireflection film, a polarizing film, and a transmittance controllable film, but is not limited thereto.

Hereinafter, the back cover 110 will be described in more detail with reference to FIGS. 7 and 8 .

<Specific composition of the back cover>

7 is a plan view of a back cover in a display device according to an exemplary embodiment of the present invention. FIG. 8 is an enlarged view of area A of FIG. 7 .

Referring to FIG. 7 , the back cover 110 includes a plurality of support areas PA and a plurality of flexible areas MA. The plurality of support areas PA is an area in which the plurality of openings 111 are not disposed, and the plurality of flexible areas MA is an area in which the plurality of openings 111 are disposed. Specifically, the first support area PA1, the first flexible area MA1, the second support area PA2, the second soft area MA2, and the third support area PA3 are sequentially disposed from the top of the back cover 110.

The first support area PA1 is the uppermost area of the back cover 110 and is an area fastened to the head bar 184 . A first fastening hole AH1 is formed in the first support area PA1 for fastening with the head bar 184 . And as described above in FIG. 3 , the head bar 184 and the screw SC passing through the first fastening hole AH1 are disposed so that the head bar 184 and the first support area PA1 of the back cover 110 can be fastened. In addition, as the first support area PA1 is fastened to the head bar 184, when the link unit 182 fastened to the head bar 184 is raised or lowered, the back cover 110 may also be moved up or down together, and the display panel 120 attached to the back cover 110 may also be moved up or down together. Although FIG. 7 illustrates that the number of first fastening holes AH1 is five, the number of first fastening holes AH1 is not limited thereto. In addition, although it has been described that the back cover 110 is fastened to the head bar 184 using the first fastening hole AH1 in FIG. 7, it is not limited thereto, and the back cover 110 and the head bar 184 may be fastened without a separate fastening hole.

The first flexible area MA1 is an area extending from the first support area PA1 to the lower side of the back cover 110 . The first flexible area MA1 is an area where the plurality of openings 111 are disposed and the display panel 120 is attached. Specifically, the first flexible area MA1 is an area that is wound or unwound around the roller 171 together with the display panel 120 . The first flexible region MA1 may overlap at least the display panel 120 among other components of the display unit DP.

The second support area PA2 is an area extending from the first flexible area MA1 to the lower side of the back cover 110 . The flexible film 130 connected to one end of the display panel 120, the source printed circuit board 140, and the source cover part 140c are attached to the second support area PA2.

In order to protect the flexible film 130 and the source printed circuit board 140, the second support area PA2 may support the flexible film 130 and the source printed circuit board 140 together with the source cover portion 140c so as to maintain a flat state without being bent by the roller 171.

Also, when the second support area PA2 is wound around the roller 171, a portion of an outer circumferential surface of the roller 171 in contact with the second support area PA2 may also be made flat. Therefore, the second support area PA2 can always maintain a flat state regardless of whether it is wound around the roller 171 or unwound, and the flexible film 130, the source printed circuit board 140, and the source cover portion 140c disposed on the second support area PA2 can also maintain a flat state.

A through hole 112 is disposed in the second support area PA2 of the back cover 110 . The through hole 112 is a hole through which a flexible cable 150 for electrically connecting the source printed circuit board 140 disposed on the second support area PA2 and the control printed circuit board 160 disposed on the opposite surface of the back cover 110 passes. However, the through hole 112 may also be disposed in the second flexible area MA2 instead of the second support area PA2, but is not limited thereto.

The second flexible area MA2 is an area extending from the second support area PA2 to the lower side of the back cover 110 . The second flexible area MA2 is an area in which the plurality of openings 111 are disposed and the display area AA of the display panel 120 is extended to be disposed outside the housing part HP. For example, when the back cover 110 and the display panel 120 are fully unwound, the third support area PA3 of the back cover 110 fixed to the roller 171 to the second support area PA2 to which the flexible film 130, the source printed circuit board 140, and the source cover unit 140c are attached may be disposed inside the housing unit HP, and the display panel 120 may be attached thereto. 1 flexible area MA1 may be disposed outside the housing part HP. In this case, when the lengths from the third support area PA3 fixed to the roller 171 to the second flexible area MA2 and the second support area PA2 are smaller than the length from the third support area PA3 to the opening HPO of the housing part HP, a part of the first flexible area MA1 to which the display panel 120 is attached may be disposed inside the housing part HP. Also, since a portion of the lower end of the display area AA of the display panel 120 is disposed inside the housing part HP, it may be difficult to view the image. Accordingly, the lengths from the third support area PA3 fixed to the roller 171 to the second flexible area MA2 and the second support area PA2 may be designed to be the same as the length from the third support area PA3 fixed to the roller 171 to the opening HPO of the housing part HP.

The third support area PA3 is an area extending from the second flexible area MA2 to the lower side of the back cover 110 . The third support area PA3 is the lowermost area of the back cover 110 and is fastened to the roller 171 . A second fastening hole AH2 may be formed in the third support area PA3 to fasten with the roller 171 . For example, a screw SC penetrating the roller 171 and the second fastening hole AH2 may be disposed so that the roller 171 and the third support area PA3 of the back cover 110 may be fastened. Also, as the third support area PA3 is engaged with the roller 171 , the back cover 110 may be wound or unwound around the roller 171 . Although FIG. 7 illustrates that there are two second fastening holes AH2, the number of second fastening holes AH2 is not limited thereto.

Meanwhile, the plurality of openings 111 formed in the plurality of flexible regions MA are not formed in the first support region PA1 , the second support region PA2 , and the third support region PA3 . That is, only the first fastening hole AH1 and the second fastening hole AH2 are formed only in the first support region PA1 and the third support region PA3, respectively, and the plurality of openings 111 as formed in the plurality of flexible regions MA are not formed in the first support region PA1, the second support region PA2, and the third support region PA3. Also, the first fastening hole AH1 and the second fastening hole AH2 have different shapes from the plurality of openings 111 . The first support area PA1 is an area fixed to the head bar 184, the second support area PA2 is an area where the flexible film 130, the source printed circuit board 140, and the source cover part 140c are supported, and the third support area PA3 is an area fixed to the roller 171 and should have more rigidity than the plurality of flexible areas MA. Specifically, as the first support area PA1 , the second support area PA2 , and the third support area PA3 have rigidity, the first support area PA1 and the third support area PA3 can be firmly fixed to the head bar 184 and the roller 171 , and the second support area PA2 is flat so that the flexible film 130 and the source printed circuit board 140 together with the source cover part 140c are not bent. to protect the flexible film 130 and the source printed circuit board 140. Therefore, the display unit DP is fixed to the roller 171 and the head bar 184 of the driving unit MP, so that it can be moved inside or outside the housing unit HP according to the operation of the driving unit MP, and the flexible film 130 and the source printed circuit board 140 can be protected.

Meanwhile, when the display unit DP is wound or unwinded, the plurality of openings 111 disposed in the plurality of flexible regions MA of the back cover 110 may be deformed by stress applied to the display unit DP. Specifically, when the display unit DP is wound or unwound, the plurality of flexible regions MA of the back cover 110 may be deformed as the plurality of openings 111 contract or expand. In addition, as the plurality of openings 111 contract or expand, a slip phenomenon of the display panel 120 disposed on the plurality of flexible regions MA of the back cover 110 is minimized, and stress applied to the display panel 120, that is, stress can be minimized.

When the display panel 120 and the back cover 110 are wound, the length of the display panel 120 wound around the roller 171 differs from the length of the back cover 110 due to a difference in curvature radius between the display panel 120 and the back cover 110. For example, when winding the back cover 110 and the display panel 120 around the roller 171, lengths required to wind the back cover 110 and the display panel 120 one turn around the roller 171 may be different. That is, since the display panel 120 is disposed outside the back cover 110 with respect to the roller 171, the length required for the display panel 120 to be wound around the roller 171 once may be longer than the length required for the back cover 110 to be wound around the roller 171 once. As such, when the display unit DP is wound, the winding length between the back cover 110 and the display panel 120 is different due to the difference in curvature radius, and the display panel 120 attached to the back cover 110 may slide and move from its original position. In this case, a phenomenon in which the display panel 120 slips from the back cover 110 due to stress generated by winding and a difference in radius of curvature may be defined as a slip phenomenon. If the slip is excessively large, the display panel 120 may be detached from the back cover 110 or defects such as cracks may occur.

At this time, in the display device 100 according to an embodiment of the present invention, even when the display unit DP is wound or unwinded and stress is applied to the display unit DP, the plurality of openings 111 of the back cover 110 are flexibly deformed to relieve stress applied to the back cover 110 and the display panel 120. For example, when the back cover 110 and the display panel 120 are wound around the roller 171, stress that deforms the back cover 110 and the display panel 120 in a vertical direction may be applied. At this time, the plurality of openings 111 of the back cover 110 may increase in the vertical direction of the back cover 110, and the length of the back cover 110 may also be flexibly deformed. Accordingly, the plurality of openings 111 of the back cover 110 may compensate for a length difference between the back cover 110 and the display panel 120 due to a difference in radius of curvature while the back cover 110 and the display panel 120 are wound. In addition, in the process of winding the back cover 110 and the display panel 120 , the plurality of openings 111 are deformed so that stress applied from the back cover 110 to the display panel 120 may be relieved.

Referring to FIGS. 7 and 8 , the plurality of openings 111 are disposed alternately with respect to the plurality of openings 111 in adjacent rows. For example, the plurality of openings 111 arranged in one row are alternately arranged with the plurality of openings 111 arranged in a row adjacent to the corresponding row. Specifically, the centers of the plurality of openings 111 arranged in odd rows and the centers of the plurality of openings 111 arranged in even rows may be staggered, for example, the openings 111 may be staggered by 1/2 of the width 111WR in the row direction. However, the arrangement of the plurality of openings 111 shown in FIGS. 7 and 8 is exemplary and is not limited thereto.

As the plurality of openings 111 are alternately arranged, a distance 111WB between the plurality of openings 111 whose centers coincide with each other in the column direction may be minimized. Specifically, in the plurality of flexible regions MA, regions between the plurality of openings 111 whose centers coincide in the column direction may have rigidity. In addition, when winding the back cover 110, since the back cover 110 must be bent in the column direction, the longer the distance 111WB of the partial region between the plurality of openings 111 having the same center in the column direction, the more difficult it is to bend the back cover 110 in the column direction. At this time, as the plurality of openings 111 are staggered in rows, the distance 111WB between the plurality of openings 111 whose centers coincide with each other in the column direction can be minimized, and the area between the plurality of openings 111 can also be minimized. Therefore, the distance 111WB between the plurality of openings 111 concentric in the column direction decreases, and as the plurality of flexible regions MA continuously extend in the column direction to remove regions where the plurality of openings 111 are not disposed, the distance 111WB between the plurality of openings 111 having rigidity in the column direction is minimized, thereby preventing the winding or unwinding of the back cover 110 without interfering with the strength of the back cover 110. sexuality can be improved.

Referring to FIG. 8 , the maximum width 111WR of the plurality of openings 111 in the row direction is greater than the maximum width 111WC in the column direction. That is, as shown in FIG. 8 , the maximum width 111WR of the plurality of openings 111 in the horizontal direction may be greater than the maximum width 111WC of the plurality of openings 111 in the vertical direction.

As the width 111WR of the plurality of openings 111 in the row direction increases, the plurality of flexible regions MA of the back cover 110 may be flexibly deformed. Specifically, when winding, the back cover 110 may be bent in the column direction of the back cover 110, and stress may be applied so that the plurality of openings 111 are stretched in the column direction. At this time, when the width 111WR of the plurality of openings 111 in the row direction increases, when the plurality of openings 111 are pulled in the column direction, the width 111WC of the plurality of openings 111 extending in the column direction may increase. In addition, as the plurality of openings 111 increase in the column direction, stress applied to the plurality of flexible regions MA may be alleviated. Therefore, by increasing the width 111WR of the plurality of openings 111 in the row direction, the plurality of flexible regions MA of the back cover 110 can be easily wound or unwound, and the stress applied to the plurality of flexible regions MA can also be relieved.

Meanwhile, in FIGS. 5, 7, and 8, the plurality of openings 111 are illustrated as having a dumbbell shape, but the maximum width 111WR of each of the plurality of openings 111 in the row direction is greater than the maximum width 111WC in the column direction. The shape of the plurality of openings 111 is not limited thereto. For example, the plurality of openings 111 may have at least one of a rectangular shape, an elliptical shape, a ribbon shape, a dumbbell shape, or a diamond shape, but is not limited thereto.

As the width 111WC of the plurality of openings 111 in the column direction increases, processing of the plurality of openings 111 becomes easier. However, when the width 111WC of the plurality of openings 111 in the column direction increases, the opening ratio of the plurality of openings 111 in the plurality of flexible regions MA increases, and the contact area between the display panel 120 attached to the plurality of flexible regions MA and the back cover 110 decreases. At this time, if the overlapping area between the display panel 120 and the back cover 110, that is, the contact area between the back cover 110 and the second adhesive layer AD2 decreases, the back cover 110 and the second adhesive layer AD2 may be peeled off. Accordingly, the adhesive force may be adjusted to prevent separation between the display panel 120 and the back cover 110 by adjusting the width 111WC of the plurality of openings 111 in the column direction, and the back cover 110 may be designed to have high flexibility by adjusting the width 111WR of the plurality of openings 111 in the row direction.

In the display device 100 according to an exemplary embodiment of the present invention, a back cover 110 having a plurality of openings 111 is disposed on the rear surface of the display panel 120 to support and protect the display panel 120 . The back cover 110 is formed of a metal material to have rigidity, and at the same time, a plurality of openings 111 are formed in the flexible area MA where the display panel 120 is disposed in the back cover 110, so that the flexibility of the back cover 110 can be improved. Accordingly, in a fully unwound state in which the display unit DP of the display device 100 is disposed outside the housing unit HP, the back cover 110 made of a rigid material and having high rigidity can support the display panel 120 so that it is spread flat. On the other hand, in a fully wound state where the display unit DP of the display device 100 is accommodated inside the housing unit HP, the back cover 110 having high flexibility due to the plurality of openings 111 may be wound around the roller 171 together with the display panel 120 and stored therein.

In addition, in the display device 100 according to an embodiment of the present invention, the back cover 110 may have flexibility by adjusting the width 111WR of the plurality of openings 111 in the row direction, and stress applied during winding of the back cover 110 may be relieved. Specifically, when the back cover 110 and the display panel 120 are wound around a roller, the back cover 110 may be bent in a column direction, and stress may be applied so that the plurality of openings 111 are stretched in a column direction. Since the plurality of openings 111 have a large width 111WR in the row direction, when the back cover 110 and the display panel 120 are wound around the roller 171, the plurality of openings 111 can be easily stretched in the column direction, and the stress applied to the back cover 110 can be relieved. Therefore, in the display device 100 according to an embodiment of the present invention, the flexibility of the back cover 110 may be increased by adjusting the width 111WR of the plurality of openings 111 in the row direction, and the back cover 110 and the display panel 120 may be easily wound around the roller 171. In addition, the plurality of openings 111 expand in the column direction and stress applied to the back cover 110 and the display panel 120 can be relieved, and thus damage to the display panel 120 can be reduced.

In addition, in the display device 100 according to an embodiment of the present invention, the adhesive force between the back cover 110 and the display panel 120 may be adjusted by adjusting the width 111WC of the plurality of openings 111 in the column direction. Specifically, the display panel 120 is attached to the flexible area MA of the back cover 110 . At this time, as the aperture ratio of the plurality of openings 111 disposed in the flexible area MA increases, the contact area between the display panel 120 and the back cover 110 decreases, and thus the adhesive force between the display panel 120 and the back cover 110 may decrease. However, in the display device 100 according to an embodiment of the present invention, the width 111WC of the plurality of openings 111 of the back cover 110 in the column direction is made small so that the opening ratio of the plurality of openings 111 can be reduced, and the contact area between the display panel 120 and the back cover 110 can be increased. As the contact area between the display panel 120 and the back cover 110 increases, the adhesive force between the display panel 120 and the back cover 110 may be improved. Therefore, in the display device 100 according to an embodiment of the present invention, the adhesive strength above a certain level can be secured by adjusting the width 111WC of the plurality of openings 111 in the column direction so that separation between the back cover 110 and the display panel 120 does not occur.

Hereinafter, the winding of the back cover 110 having the plurality of support areas PA and the plurality of flexible areas MA together with the display panel 120 around the roller 171 will be described in detail with reference to FIGS. 9A to 9D .

<Winding process of back cover and display panel>

9A is a cross-sectional view of a display device according to an exemplary embodiment. 9B is an enlarged view of area B of FIG. 9A. 9C is a cross-sectional view of a display device according to an exemplary embodiment. 9D is a cross-sectional view of a display device according to an exemplary embodiment. 9A is a cross-sectional view of a state in which the back cover 110 is fully unwound around the roller 171. 9C is a cross-sectional view in a state in which the third support area PA3 and the second flexible area MA2 of the back cover 110 are wound around the roller 171 . 9D is a cross-sectional view in a state in which the third support area PA3, the second flexible area MA2, and the second support area PA2 of the back cover 110 are wound around the roller 171. Referring to FIG.

Referring to FIG. 9A , the roller 171 has a cylindrical shape as a whole, but a portion thereof may be made of a flat surface. That is, a portion of the outer circumferential surface of the roller 171 is formed of a flat portion 171F, and the remaining portion of the outer circumferential surface is formed of a curved portion 171R.

The third support area PA3 is fastened to the flat portion 171F of the roller 171 . Except for the third support area PA3 fastened to the roller 171, the rest of the back cover 110 extending from the third support area PA3 may be in a flat state.

Meanwhile, as described above with reference to FIG. 7 , when the back cover 110 is in a fully unwound state, the third support area PA3, the second flexible area MA2, and the second support area PA2 of the back cover 110 may be disposed inside the housing part HP, and the first support area PA1 and the first flexible area MA1 may be disposed outside the housing part HP.

Meanwhile, a guide roller 171G may be further disposed inside the housing part HP. The guide roller 171G is not fixed to one side of the back cover 110 and may guide the rest of the flexible cable 150 disposed inside the housing part HP to be wound around the roller 171 together with the back cover 110 and the display panel 120. However, the position of the guide roller 171G may be changed or omitted depending on the arrangement of the flexible cable 150, but is not limited thereto.

Referring to FIG. 9B together, the display device 100 includes a source cover part 140c and a control printed circuit board 160 .

First, the source cover part 140c in which the source printed circuit board 140 is accommodated is disposed on the second support area PA2 on one surface of the back cover 110 . The source cover portion 140c includes a source base plate 141c and a source cover plate 142c.

A source base plate 141c is disposed on one surface of the back cover 110 . A source printed circuit board 140 is disposed on one surface of the source base plate 141c. When the display unit DP is wound, the source base plate 141c may support the source printed circuit board 140 to maintain a flat state without being bent. For example, the source base plate 141c may be fixed to the back cover 110 with screws or the like and may be made of a material having rigidity, but is not limited thereto.

Meanwhile, a portion of the source base plate 141c may be opened to correspond to the through hole 112 of the back cover 110 . The flexible cable 150 may be respectively connected to the source printed circuit board 140 and the control printed circuit board 160 through the open portion of the source base plate 141c and the through hole 112 of the back cover 110. However, depending on the arrangement of the through holes 112 of the back cover 110, a portion of the source base plate 141c may not be open, and the arrangement of the through holes 112 is not limited thereto.

A source cover plate 142c is disposed on at least a portion of the source base plate 141c, the source printed circuit board 140 fixed to the source base plate 141c, and the flexible film 130 connected to the source printed circuit board 140. The source cover plate 142c is disposed to cover the source base plate 141c, the source printed circuit board 140, and the flexible film 130, and may have a convex shape. The source cover plate 142c may protect the source printed circuit board 140 and the flexible film 130, and may be made of a rigid material, but is not limited thereto.

A third adhesive layer AD3 may be disposed between the source base plate 141c and the source printed circuit board 140 . The third adhesive layer AD3 may adhere the source printed circuit board 140 to the source base plate 141c. The third adhesive layer AD3 is made of an adhesive material and may be a heat-curable or natural-curable adhesive. For example, the third adhesive layer AD3 may be formed of optical clear adhesive (OCA) or pressure sensitive adhesive (PSA), but is not limited thereto.

A flexible cable 150 electrically connecting the control printed circuit board 160 and the source printed circuit board 140 is disposed. One end of the flexible cable 150 may be connected to the source printed circuit board 140 disposed on one surface of the back cover 110, and the other end of the flexible cable 150 may be connected to the control printed circuit board 160 disposed on the opposite surface of the one surface of the back cover 110. That is, the flexible cable 150 penetrates through the through hole 112 of the back cover 110 and electrically connects the source printed circuit board 140 on one side of the back cover 110 and the control printed circuit board 160 on the opposite side of the one side of the back cover 110. The flexible cable 150 may be, for example, a flexible flat cable (FFC), but is not limited thereto.

Since the flexible cable 150 is respectively connected to the source printed circuit board 140 and the control printed circuit board 160 disposed inside the housing part HP, regardless of whether the display part DP is wound or unwound, it can be disposed only inside the housing part HP. Accordingly, the flexible cable 150 may be disposed only inside the housing part HP and may not be visually recognized by the user.

A fourth adhesive layer AD4 may be disposed between the opposite surface of one surface of the back cover 110 and at least a portion of the flexible cable 150 . Specifically, the fourth adhesive layer AD4 may be disposed to extend from an upper boundary of the through hole 112 toward the display panel 120 on a surface opposite to one surface of the back cover 110 .

Also, the fourth adhesive layer AD4 may adhere the flexible cable 150 to a surface opposite to one surface of the back cover 110 . The fourth adhesive layer AD4 is made of an adhesive material and may be a heat-curable or natural-curable adhesive. For example, the fourth adhesive layer AD4 may be formed of optical clear adhesive (OCA) or pressure sensitive adhesive (PSA), but is not limited thereto.

Accordingly, at least a portion of the flexible cable 150 may be fixed to the side of the display panel 120 from the surface opposite to one surface of the back cover 110 by the fourth adhesive layer AD4 . In detail, a portion of the flexible cable 150 may be fixed from the upper boundary of the through hole 112 to the display panel 120 on the side opposite to one surface of the back cover 110 . In addition, at least a portion of the flexible cable 150 is fixed from the upper boundary of the through hole 112 toward the display panel 120, so that when winding or unwinding the display DP, the display DP may be wound or unwound along with the display DP without interfering with the winding or unwinding of the display DP to the roller 171.

A control printed circuit board 160 is disposed on the opposite side of one side of the back cover 110 . Specifically, the control printed circuit board 160 may be disposed on a surface opposite to one surface of the back cover 110 and electrically connected to the source printed circuit board 140 disposed on one surface of the back cover 110 . The control printed circuit board 160 is disposed outside the roller 171, and for example, the control printed circuit board 160 may be disposed on an inner side surface of the housing part HP. The control printed circuit board 160 supplies timing signals for controlling driving ICs such as gate driver ICs and data driver ICs to driving ICs. For example, the control printed circuit board 160 may be equipped with a timing controller that generates gate control signals such as a gate start pulse, a gate shift clock, and a gate output enable signal and data control signals such as a source start pulse, a source sampling clock, and a source output enable signal, and the generated gate control signal and data control signal may be supplied to a driving IC.

A fifth adhesive layer AD5 may be disposed between the control printed circuit board 160 and the inner side of the housing part HP. The fifth adhesive layer AD5 may adhere the control printed circuit board 160 to the inner side of the housing part HP. The fifth adhesive layer AD5 is made of an adhesive material and may be a heat-curable or natural-curable adhesive. For example, the fifth adhesive layer AD5 may be formed of optical clear adhesive (OCA) or pressure sensitive adhesive (PSA), but is not limited thereto.

Next, referring to FIG. 9C , the third support area PA3 and the second flexible area MA2 of the back cover 110 are wound around the roller 171, and the second support area PA2 and the first flexible area MA1 extending from the second soft area MA2 are unwound.

Of the outer circumferential surface of the roller 171, the third support area PA3 is disposed on the flat portion 171F, and the second flexible area MA2 is disposed on the curved portion 171R.

Next, referring to FIG. 9D , the third support area PA3, the second flexible area MA2, and the second support area PA2 of the back cover 110 are wound around the roller 171, and the first soft area MA1 extending from the second support area PA2 is in an unwinded state.

Of the outer circumferential surface of the roller 171, the second flexible region MA2 is disposed on the curved portion 171R, and the third support region PA3 and the second support region PA2 are disposed on the flat portion 171F.

Since the second support area PA2 on which the source printed circuit board 140, the flexible film 130, and the source cover portion 140c are disposed is wound around the flat portion 171F of the roller 171, the source printed circuit board 140, the flexible film 130, and the source cover portion 140c of the second support area PA2 may maintain a flat state without being bent. Therefore, the flexible film 130, the source printed circuit board 140, and the source cover portion 140c can always be kept flat regardless of whether the display portion DP is wound or unwound, and the flexible film 130 and the source printed circuit board 140 can be prevented from being damaged as they are bent.

At this time, the source cover plate 142c of the source cover part 140c disposed in the second support area PA2 has a convex shape. The convex shape of the source cover plate 142c may have a shape corresponding to the curved portion 171R of the roller 171 . Accordingly, in a state in which the second support area PA2 is wound around the roller 171, cross sections of the curved portion 171R of the roller 171 and the source cover plate 142c may have a substantially circular shape.

Thereafter, in the case of a portion of the first flexible region MA1 wound to overlap the flat portion 171F of the roller 171, it may be bent like the second flexible region MA2 wound to the curved portion 171R of the roller 171. Specifically, in a state in which the third support area PA3, the second flexible area MA2, and the second support area PA2 are wound around the roller 171, the first flexible area MA1 may be wound to cover the second support area PA2 and the second flexible area MA2. At this time, since the source cover plate 142c disposed on the second support region PA2 has a curved surface, a portion of the first flexible region MA1 disposed to cover the second support region PA2 overlapping the planar portion 171F may be bent according to the shape of the source cover plate 142c.

At this time, the guide roller 171G may be wound around the roller 171 while the rest of the flexible cable 150, which is not fixed to the opposite side of one side of the back cover 110, is in contact with the opposite side of one side of the back cover 110. It can be guided. Accordingly, the flexible cable 150 may be wound around the roller 171 in a straight line without being entangled by the guide roller 171G.

Specifically, as the second support area PA2 is wound around the roller 171, the flexible cable 150 is also wound around the roller 171 together with the second support area PA2. Specifically, on the opposite side of the back cover 110, the flexible cable 150, one part of which is fixed by the fourth adhesive layer AD4 so as to overlap the second support area PA2, may be wound around the roller 171 together with the back cover 110. Accordingly, in a state in which the back cover 110 and the display panel 120 are fully wound around the roller 171, the flexible cable 150 may be disposed between at least a portion of a surface opposite to one surface of the back cover 110 and at least a portion of the upper surface of the display panel 120 and may be wound around the roller 171.

In the display device 100 according to an exemplary embodiment of the present invention, a back cover 110 having a plurality of openings 111 is disposed on the rear surface of the display panel 120 to support and protect the display panel 120 . The back cover 110 may be formed of a metal material to have rigidity, and at the same time, flexibility of the back cover 110 may be improved by forming a plurality of openings 111 . Accordingly, in a fully unwound state in which the display unit DP of the display device 100 is disposed outside the housing unit HP, the back cover 110 made of a rigid material and having high rigidity can support the display panel 120 so that it is spread flat. On the other hand, in a fully wound state where the display unit DP of the display device 100 is accommodated inside the housing unit HP, the back cover 110 having high flexibility due to the plurality of openings 111 may be wound around the roller 171 together with the display panel 120 and stored therein.

In addition, by adjusting the width 111WR of the plurality of openings 111 in the row direction, the back cover 110 may have flexibility, and stress applied during winding of the back cover 110 may be relieved. Specifically, when the back cover 110 and the display panel 120 are wound around a roller, the back cover 110 may be bent in a column direction, and stress may be applied so that the plurality of openings 111 are stretched in a column direction. Since the plurality of openings 111 have a large width 111WR in the row direction, when the back cover 110 and the display panel 120 are wound around the roller 171, the plurality of openings 111 can be easily stretched in the column direction, and the stress applied to the back cover 110 can be relieved. Therefore, in the display device 100 according to an embodiment of the present invention, the flexibility of the back cover 110 may be increased by adjusting the width 111WR of the plurality of openings 111 in the row direction, and the back cover 110 and the display panel 120 may be easily wound around the roller 171. In addition, the plurality of openings 111 expand in the column direction and stress applied to the back cover 110 and the display panel 120 can be relieved, and thus damage to the display panel 120 can be reduced.

In addition, in the display device 100 according to an embodiment of the present invention, the adhesive force between the back cover 110 and the display panel 120 may be adjusted by adjusting the width 111WC of the plurality of openings 111 in the column direction. Specifically, the display panel 120 is attached to the first flexible region MA1 of the back cover 110 . At this time, as the aperture ratio of the plurality of openings 111 disposed in the first flexible region MA1 increases, the contact area between the display panel 120 and the back cover 110 decreases, and thus the adhesive force between the display panel 120 and the back cover 110 may decrease. However, in the display device 100 according to an embodiment of the present invention, the width 111WC of the plurality of openings 111 of the back cover 110 in the column direction is made small so that the opening ratio of the plurality of openings 111 can be reduced, and the contact area between the display panel 120 and the back cover 110 can be increased. As the contact area between the display panel 120 and the back cover 110 increases, the adhesive force between the display panel 120 and the back cover 110 may be improved. Therefore, in the display device 100 according to an embodiment of the present invention, the adhesive strength above a certain level can be secured by adjusting the width 111WC of the plurality of openings 111 in the column direction so that separation between the back cover 110 and the display panel 120 does not occur.

In the display device 100 according to an embodiment of the present invention, damage to the flexible film 130 and the source printed circuit board 140 disposed on the second support area PA2 can be minimized by disposing the second support area PA2 and the source cover part 140c accommodating the source printed circuit board 140 on the second support area PA2. Specifically, when the back cover 110 is wound around the roller 171, the back cover 110 may be bent and wound along the shape of the roller 171. However, when the flexible film 130 and the source printed circuit board 140 are bent along the shape of the roller 171, the flexible film 130 and the source printed circuit board 140 may be damaged. At this time, the second support area PA2 is an area where the plurality of openings 111 are not disposed and can always maintain a flat state, and the flexible film 130, the source printed circuit board 140, and the source cover part 140c disposed on the second support area PA2 can be supported to maintain a flat state. In addition, a portion of the roller 171 around which the second support area PA2 is wound may be formed as a planar portion 171F so that the second support area PA2 is wound around the roller 171 evenly. Therefore, since the second support area PA2 can always maintain a flat state regardless of whether it is wound or unwound around the roller 171, the flexible film 130 attached to the second support area PA2, the source printed circuit board 140, and the source cover part 140c can also always maintain a flat state. For example, when the display unit DP is fully unwound, the flexible film 130 and the source printed circuit board 140 may be maintained flat by the source base plate 141c and the second support area PA2. Conversely, when the display unit DP is in a full-wound state, the flexible film 130 and the source printed circuit board 140 are seated on the flat portion 171F of the roller 171 so that they can be maintained flat. Therefore, in the display apparatus 100 according to an embodiment of the present invention, the second support region PA2 and the source base plate 141c are flatly formed, and a part of the outer circumferential surface of the roller 171 may be formed as a flat portion 171F, so that the flexible film 130 and the source printed circuit board 140 may not be bent repeatedly. The damage of the flexible film 130 and the source printed circuit board 140 may be minimized.

In the display device 100 according to an embodiment of the present invention, since the control printed circuit board 160 is disposed outside the roller 171, replacement and repair of the control printed circuit board 160 may be facilitated. Conventionally, a control printed circuit board is disposed inside the roller and electrically connected to a source printed circuit board outside the roller through a flexible cable. However, when the control printed circuit board inside the roller needs to be replaced or repaired, the housing part, the back cover, etc. have to be dismantled to take out the control printed circuit board inside the roller. Accordingly, since the control printed circuit board 160 is disposed outside the roller 171 in the display device 100 according to an embodiment of the present invention, the control printed circuit board 160 can be easily replaced and repaired without disassembling the back cover 110 and the roller 171.

In addition, in the display device 100 according to an embodiment of the present invention, the size of the roller 171 may be reduced by disposing the control printed circuit board 160 outside the roller 171, and the volume of the display device 100 may be reduced. The size and volume of the control printed circuit board 160 for driving the display device 100 increases as the display device 100 has a high resolution and a large area. However, since the control printed circuit board is conventionally disposed inside the roller, when the display device has a large area and high resolution, the size of the roller is inevitably increased. However, when the size of the roller is increased, the volume of the display device increases and the weight of the driving unit also increases. Therefore, in the display device 100 according to an embodiment of the present invention, the control printed circuit board 160 is disposed outside the roller 171 so that the size of the control printed circuit board 160 is not limited, the size of the roller 171 can be reduced, and the volume of the display device 100 can be reduced. Accordingly, when the display device 100 is not viewed, the volume of the display unit DP can be reduced by winding, and a rollable display device that can be easily transported can be provided.

In addition, the display device 100 according to an exemplary embodiment of the present invention may effectively dissipate heat generated from the control printed circuit board 160 by disposing the control printed circuit board 160 outside the roller 171 . Conventionally, since the control printed circuit board is disposed inside the roller, it is difficult to discharge heat generated from the control printed circuit board to the outside, which may damage the control printed circuit board and reduce efficiency. Therefore, in the display device 100 according to an embodiment of the present invention, since the control printed circuit board 160 is disposed outside the roller 171 and inside the housing HP, heat from the control printed circuit board 160 can be effectively dissipated and reliability of the control printed circuit board 160 can be improved.

<Protection of Control Printed Circuit Board>

10 is a plan view of a display unit of a display device according to another exemplary embodiment of the present invention. 11 is a cross-sectional view taken along line XI-XI' in FIG. 10; The display device 1000 of FIGS. 10 and 11 is different from the display device 100 of FIGS. 1 to 9C in the shape of the back cover 1010 and the roller 1071 and the arrangement of the control printed circuit board 160, and further includes a control cover part 160c, and other components are substantially the same, so duplicate descriptions are omitted.

Referring to FIG. 10 , the through hole 1012 of the back cover 1010 is disposed from an area adjacent to the lower edge of the source printed circuit board 140 in the second support area PA2 to the third support area PA3. That is, the through hole 1012 may be formed from an area adjacent to the boundary between the second support area PA2 and the second flexible area MA2 of the second support area PA2 to the third support area PA3.

Meanwhile, since the through hole 1012 is a hole through which the flexible cable 150 electrically connecting the source printed circuit board 140 and the control printed circuit board 160 passes, the edge of the control printed circuit board 160 and the edge of the source printed circuit board 140 may be formed to correspond to each other. For example, when the control printed circuit board 160 is disposed to overlap two centered source printed circuit boards 140 among the four source printed circuit boards 140, the through hole 1012 may be arranged to correspond to the lower edge of the control printed circuit board 160 and the lower edges of the two centrally located source printed circuit boards 140 among the four source printed circuit boards 140. Hereinafter, for convenience of explanation, it will be assumed that the control printed circuit board 160 is arranged to overlap the two source printed circuit boards 140 located in the middle among the four source printed circuit boards 140, but it is not limited thereto.

The through hole 1012 may be formed from the lower edge of the control printed circuit board 160 to a portion that first overlaps the second flat portion 1071Fb among the third support area PA3 and the second flexible area MA2 that are wound around the roller 1071 before the control printed circuit board 160. Specifically, the second planar portion 1071Fb is disposed closer to the center of the roller 1071 than the first planar portion 1071Fa. At this time, when a portion of the back cover 1010 is wound in contact with the first planar portion 1071Fa, since the first planar portion 1071Fa protrudes more than the second planar portion 1071Fb, a portion of the back cover 1010 may be wound so as to come into contact with only the first planar portion 1071Fa and wound away from the second planar portion 1071Fb. Accordingly, the control cover part 160c, which must be seated on the second flat part 1071Fb to not interfere with the winding and unwinding of the display device 1000, cannot be seated on the second flat part 1071Fb due to a part of the back cover 1010. Accordingly, the through hole 1012 may be formed from a portion of the back cover 1010 that first overlaps the second planar portion 1071Fb to a lower edge of the control cover portion 160c. For example, when the third support area PA3 is first wound on the planar portion, the through hole 1012 may be disposed from a portion of the third support area PA3 overlapping the second planar portion 1071Fb to a lower edge of the control cover portion 160c, except for a portion overlapping the first planar portion 1071Fa. However, the arrangement of the through hole 1021 may vary depending on where the part of the back cover 1010 first contacting the roller 1071 is, but is not limited thereto.

Referring to FIG. 11 , the control printed circuit board 160 is disposed outside the roller 1071 . Specifically, the control printed circuit board 160 is disposed in the second support area PA2 on the opposite side of one surface of the back cover 1010 so as to overlap the source printed circuit board 140 . In addition, the control printed circuit board 160 disposed on the opposite side of one surface of the back cover 1010 may be electrically connected to the source printed circuit board 140 disposed on one surface of the back cover 1010 through a flexible cable 150.

The control cover part 160c in which the control printed circuit board 160 is accommodated is disposed on the second support area PA2 on the opposite side of one surface of the back cover 1010 . The control cover part 160c includes a control base plate 161c and a control cover plate 162c.

A control base plate 161c is disposed on the opposite side of one side of the back cover 1010. A control printed circuit board 160 is disposed on one side of the control base plate 161c. When the display device 1000 is wound, the control base plate 161c may support the control printed circuit board 160 to maintain a flat state without being bent. For example, the control base plate 161c may be fixed to the back cover 1010 with screws or the like and may be made of a rigid material, but is not limited thereto.

A sixth adhesive layer AD6 may be disposed between the control base plate 161c and the control printed circuit board 160 . The sixth adhesive layer AD6 may adhere the control printed circuit board 160 to the control base plate 161c. The sixth adhesive layer AD6 is made of an adhesive material and may be a heat-curable or natural-curable adhesive. For example, the sixth adhesive layer AD6 may be formed of optical clear adhesive (OCA) or pressure sensitive adhesive (PSA), but is not limited thereto.

A portion of the control base plate 161c may be opened to correspond to the through hole 1012 of the back cover 1010 . The flexible cable 150 may be respectively connected to the source printed circuit board 140 and the control printed circuit board 160 through the open portion of the control base plate 161c and the through hole 1012 of the back cover 1010. However, depending on the arrangement of the through holes 1012 of the back cover 1010, a portion of the control base plate 161c may not be open, but is not limited thereto.

A control cover plate 162c is disposed on the control base plate 161c and the control printed circuit board 160 fixed to the control base plate 161c. The control cover plate 162c is disposed to cover the control base plate 161c and the control printed circuit board 160, and may have a flat shape. The control cover plate 162c may protect the control printed circuit board 160 and may be made of a rigid material, but is not limited thereto.

Meanwhile, a plurality of openings 163c are disposed in the control cover plate 162c. The plurality of openings 163c are disposed on the control cover plate 162c covering the control printed circuit board 160 so that heat generated from the control printed circuit board 160 can be discharged to the outside of the control cover portion 160c. Accordingly, heat generated from the control printed circuit board 160 may be discharged to the outside through the plurality of openings 163c of the control cover plate 162c.

Meanwhile, the control cover part 160c and the source cover part 140c may be formed in a D shape. The control cover part 160c and the source cover part 140c are formed in a D shape, so that when the display part DP is wound around the roller 1071, it may correspond to a plane portion of the roller 1071. Accordingly, the D-shaped control cover portion 160c and the source cover portion 140c may form a circular shape together with the curved portion of the roller 1071 .

At this time, the shape of the roller 1071 may be modified depending on whether only the source cover part 140c is disposed in the second support area PA2 or whether both the source cover part 140c and the control cover part 160c are disposed. Hereinafter, the roller 1071 will be described in more detail with reference to FIG. 12 .

<Design of roller and back cover>

12 is a perspective view of a roller in a display device according to another exemplary embodiment of the present invention. 13 is a schematic exploded perspective view illustrating winding of a source cover part and a control cover part of a display device according to another embodiment of the present invention around a roller. 14 is a schematic perspective view illustrating winding of a back cover of a display device according to another embodiment of the present invention around a roller. 14 is a perspective view in a state in which the roller 1071 is wound to the third support area PA3 and the second flexible area MA2 of the back cover 1010 . In FIG. 13, only the roller 1071, the source cover part 140c, and the control cover part 160c are shown for convenience of description. In FIG. 14 , only the roller 1071 and the back cover 1010 are illustrated for convenience of explanation, and the opening 111 of the second flexible region MA2 is omitted.

Referring to FIG. 12 , the outer circumferential surface of the roller 1071 includes a flat portion 1071F and a curved portion 1071R, and the flat portion 1071F includes a first planar portion 1071Fa and a second planar portion 1071Fb.

The second flat part 1071Fb may be disposed closer to the center of the roller 1071 than the first flat part 1071Fa. That is, the straight line distance from the center of the roller 1071 to the second flat part 1071Fb may be shorter than the straight line distance from the center of the roller 1071 to the first flat part 1071Fa.

Meanwhile, although FIG. 12 shows that the second flat part 1071Fb is disposed between the first flat part 1071Fa and the first flat part 1071Fa, the arrangement of the second flat part 1071Fb may be changed corresponding to the arrangement of the control cover part 160c, but is not limited thereto.

In the display device according to another embodiment of the present invention, a surface opposite to one surface of the back cover 1010 may be wound to face the outer circumferential surface of the roller 1071 . In order for the control cover portion 160c disposed to protrude from one side of the back cover 1010 opposite to the other side of the back cover 1010, the second planar portion 1071Fb may be disposed closer to the center of the roller 1071 than the first planar portion 1071Fa.

Hereinafter, referring to FIG. 13 , the mounting of the source cover part 140c and the control cover part 160c on the first flat part 1071Fa and the second flat part 1071Fb of the roller 1071 will be described in detail.

Referring to FIG. 13 , when the display device 1000 is wound around the roller 1071, only the source cover portion 140c in which the source printed circuit board 140 is accommodated may be seated on the first flat portion 1071Fa of the roller 1071. Specifically, the source base plate 141c of the source cover part 140c may be disposed to correspond to the first flat part 1071Fa. Further, the cross section of the source cover part 140c seated on the curved portion 1071R of the roller 1071 and the first flat portion 1071Fa may have a substantially circular shape.

When the display device 1000 is wound around the roller 1071, the source cover part 140c in which the source printed circuit board 140 is accommodated and the control cover part 160c in which the control printed circuit board 160 is accommodated may be seated on the second planar portion 1071Fb of the roller 1071. Specifically, the control base plate 161c of the control cover part 160c may be disposed to correspond to the second flat part 1071Fb. Cross sections of the control cover part 160c and the source cover part 140c seated on the curved portion 1071R of the roller 1071 and the second flat portion 1071Fb may have substantially circular shapes.

Therefore, by disposing the flat part 1071F of the roller 1071 to correspond to the arrangement of the source cover part 140c and the control cover part 160c, the source cover part 140c and the control cover part 160c can be wound around the roller 1071 while maintaining a flat state. Accordingly, the flexible film 130, the source printed circuit board 140, and the control printed circuit board 160 accommodated in the source cover portion 140c and the control cover portion 160c can always be kept flat regardless of winding and unwinding of the display device 1000, and the flexible film 130, the source printed circuit board 140, and the control printed circuit board 160 are not damaged by repeated bending. that can be prevented.

Hereinafter, the winding of the back cover 1010 around the roller 1071 designed to correspond to the arrangement of the source cover part 140c and the control cover part 160c will be described in detail with reference to FIG. 14 .

Referring to FIG. 14 , the third support area PA3 of the back cover 1010 is disposed on the first flat portion 1071Fa of the flat portions 1071F of the roller 1071 . For example, a screw SC penetrating the second fastening hole AH2 of the third support area PA3 and the first planar portion 1071Fa is disposed so that the third support area PA3 of the back cover 1010 may be fixed to the first planar portion 1071Fa of the roller 1071.

In a state in which the third support area PA3 is disposed on the first planar portion 1071Fa, the back cover 1010 may not contact the second planar portion 1071Fb. Specifically, since the through hole 1012 is disposed at the central portion of the third support area PA3 to correspond to the second planar portion 1071Fb, the third support area PA3 of the back cover 1010 is only in contact with the first planar portion 1071Fa, but may not come into contact with the second planar portion 1071Fb.

Next, the second flexible region MA2 of the back cover 1010 is disposed on the curved portion 1071R of the roller 1071 . Specifically, the second flexible region MA2 of the back cover 1010 may contact only a portion of the curved portion 1071R extending from the first planar portion 1071Fa among the curved portions 1071R, and the back cover 1010 may not contact the remaining portion of the curved portion 1071R extending from the second planar portion 1071Fb. Since the through hole 1012 is disposed from the third support area PA3 to the second flexible area MA2 and a part of the second support area PA2 to correspond to the remaining portion of the curved portion 1071R extending from the second flat portion 1071Fb, the remaining portion of the curved portion 1071R extending from the second flat portion 1071Fb is the second flexible area MA2 of the back cover 1010. ) may not touch.

Subsequently, a second support area PA2 may be disposed on the flat portion 1071F of the roller 1071 . Specifically, the second support area PA2 extending from the second flexible area MA2 may be disposed on the first planar portion 1071Fa and the second planar portion 1071Fb. The control cover part 160c disposed on the rear surface of the second support area PA2 may be seated on the second flat part 1071Fb of the roller 1071, and the source cover part 140c may be disposed to cover the first flat part 1071Fa and the second flat part 1071Fb, so as to form a circular shape with the curved part 1071R of the roller 1071.

Since the through hole 1012 is disposed from the second support area PA2 near the lower edge of the control cover portion 160c to the second flexible area MA2, the third support area PA3 and the second flexible area MA2 do not come into contact with the second flat portion 1071Fb, but only come into contact with the first flat portion 1071Fa until the control cover portion 160c is wound around the roller 1071. It can be. Accordingly, as the through hole 1012 is formed in the back cover 1010, the control cover portion 160c disposed in the second support area PA2 of the back cover 1010 may be seated on the second flat portion 1071Fb of the roller 1071.

If the through hole 1012 is not disposed, the second flexible area MA2 of the back cover 1010 may prevent the control cover part 160c from being seated on the second flat part 1071Fb. When the third support area PA3 and the second flexible area MA2 are disposed to cover the second planar portion 1071Fb, the control cover portion 160c is disposed on the second flexible area MA2 and may protrude from the outer circumferential surface of the roller 1071, and may interfere with winding and unwinding of the display device 1000. Accordingly, the through hole 1012 is disposed in a part of the back cover 1010 corresponding to the second planar portion 1071Fb until the control cover portion 160c is seated so that the control cover portion 160c is seated on the second planar portion 1071Fb of the roller 1071 and wound.

In the display device according to another embodiment of the present invention, the control cover portion 160c accommodating the control printed circuit board 160 may be disposed on the second support area PA2 to protect the control printed circuit board 160 that is wound or unwound together with the back cover 1010 and the display panel 120. Specifically, when the back cover 1010 is wound around the roller 1071, the back cover 1010 may be bent and wound along the shape of the roller 1071. However, when the control printed circuit board 160 disposed on the back cover 1010 is bent along the shape of the roller 1071 together with the back cover 1010, the control printed circuit board 160 may be damaged. In this case, the second support area PA2 is an area where the plurality of openings 111 are not disposed and can always maintain a flat state, and the control printed circuit board 160 disposed on the second support area PA2 can be supported to maintain a flat state. In addition, the control cover portion 160c in which the control printed circuit board 160 is accommodated is also made of a rigid material to protect the control printed circuit board 160 and at the same time support it to maintain a flat state. In addition, a portion of the roller 1071 on which the control printed circuit board 160 and the control cover portion 160c are wound may be formed as a planar portion 1071F so that the second support area PA2 and the control printed circuit board 160 and the control cover portion 160c on the second support area PA2 are flatly wound around the roller 1071. Therefore, since the second support area PA2 can always maintain a flat state regardless of whether it is wound or unwound on the roller 1071, the control printed circuit board 160 and the control cover 160c attached to the second support area PA2 can also always maintain a flat state. Therefore, in the display device according to another embodiment of the present invention, the second support area PA2 and the control base plate 161c are formed flat, and a part of the outer circumferential surface of the roller 1071 is formed as a flat portion 1071F so that the control printed circuit board 160 cannot be repeatedly bent and the control printed circuit board 160 can be protected.

In the display device according to another embodiment of the present invention, heat generated from the control printed circuit board 160 can be effectively discharged by disposing the opening 163c in the control cover 160c accommodating the control printed circuit board 160 . Specifically, when the control printed circuit board 160 disposed within the control cover portion 160c is driven, heat may be generated from the control printed circuit board 160 . At this time, the heat generated from the control printed circuit board 160 may decrease the efficiency of the control printed circuit board 160 . However, since the heat generated from the control printed circuit board 160 can be released to the outside through the plurality of openings 163c of the control cover plate 162c of the control cover portion 160c, the reduction in efficiency of the control printed circuit board 160 due to heat can be minimized. Accordingly, the reliability of the control printed circuit board 160 may be improved by disposing the opening 163c capable of dissipating heat in the control cover portion 160c disposed to protect the control printed circuit board 160 .

In the display device according to another embodiment of the present invention, since the source printed circuit board 140 and the control printed circuit board 160 overlap each other with the back cover 1010 therebetween, the length of the flexible cable 150 electrically connecting the source printed circuit board 140 and the control printed circuit board 160 can be reduced. The flexible cable 150 may have one end electrically connected to the source printed circuit board 140 and the other end electrically connected to the control printed circuit board 160 . The longer the distance between the source printed circuit board 140 and the control printed circuit board 160, the longer the flexible cable 150 should be. However, as the length of the flexible cable 150 increases, noise of a signal transmitted through the flexible cable 150 may increase, and reliability of the display device may deteriorate. Therefore, in the display device according to another embodiment of the present invention, the length of the flexible cable 150 connected to the source printed circuit board 140 and the control printed circuit board 160 can be reduced and noise of the flexible cable 150 can be minimized by arranging the source printed circuit board 140 and the control printed circuit board 160 to overlap each other.

<Edge reinforcement part of through hole>

15 is a top plan view of a back cover in a display device according to another embodiment of the present invention. In the back cover 1510 of FIG. 15, compared to the back cover 1010 of FIGS. 10 to 14, only an edge reinforcement portion (ERA) is further disposed at the edge of the through hole 1012, and other configurations are substantially the same, so redundant description is omitted.

Referring to FIG. 15 , an edge reinforcement portion ERA is disposed at an edge portion of the through hole 1012 . Specifically, the edge reinforcement portion ERA is disposed at the edge portion of the through hole 1012 in the second flexible region MA2 . That is, the edge reinforcement part ERA may be disposed in the second flexible region MA2 . The edge reinforcement portion ERA is a region in which the plurality of openings 111 are not disposed, and may have higher rigidity than a portion of the second flexible region MA2 in which the plurality of openings 111 are disposed.

In the display device according to another embodiment of the present invention, cracks of the back cover 1510 may be minimized by disposing an edge reinforcement part ERA at an edge of the through hole 1012 of the back cover 1510 . Specifically, the through hole 1012 formed in the second flexible region MA2 may be formed to overlap some of the plurality of openings 111 . Accordingly, a portion of the edge of the through hole 1012 may be bumpy along the shape of the opening 111, and cracks of the back cover 1510 may easily occur from the bumpy edge. At this time, as the edge reinforcement portion ERA in which the plurality of openings 111 are not formed is disposed at the edge of the through hole 1012, the edge of the through hole 1012 may be formed smoothly, and the possibility of cracking of the back cover 1510 may be reduced.

A display device according to embodiments of the present invention can be described as follows.

A display device according to an embodiment of the present invention includes a display panel in which a plurality of pixels are defined, a back cover supporting the display panel on the rear surface of the display panel and having a through hole disposed thereon, a plurality of flexible films electrically connected to one end of the display panel, a plurality of flexible films disposed on one surface of the back cover, a source printed circuit board electrically connected to the plurality of flexible films, a source printed circuit board disposed on one surface of the back cover, a control printed circuit board electrically connected to the source printed circuit board, and disposed on a surface opposite to one surface of the back cover, and a through hole. and a flexible cable electrically connecting the source printed circuit board and the control printed circuit board through a flexible cable.

According to another feature of the present invention, a housing portion accommodating the back cover and the display panel and a roller on which the back cover and the display panel are wound or unwound may further be included.

According to another feature of the present invention, at least a portion of the flexible cable may be fixed from a side opposite to one side of the back cover toward the display panel.

According to another feature of the present invention, an adhesive layer disposed extending from an upper boundary of the through hole to the display panel side on the opposite side of one side of the back cover, and the flexible cable may be fixed to the opposite side of the one side of the back cover by the adhesive layer.

According to another feature of the present invention, in a state in which the display panel and the back cover are fully wound around the roller, the flexible cable may be disposed between at least a portion of a surface opposite to one surface of the back cover and at least a portion of the upper surface of the display panel and wound around the roller.

According to another feature of the invention, the control printed circuit board can be arranged outside the roller.

According to another feature of the present invention, the control printed circuit board may be disposed on the opposite side of one side of the back cover so as to overlap the source printed circuit board.

According to another feature of the present invention, a source cover part disposed on one surface of the back cover to accommodate the source printed circuit board and a control cover part disposed on the opposite surface of the back cover to accommodate the control printed circuit board, and the source cover part and the control cover part may be formed in a D shape.

According to another feature of the present invention, in a state in which the display panel and the back cover are fully wound around the roller, the outer surface of the control cover unit may come into contact with the outer circumferential surface of the roller.

According to another feature of the present invention, the outer circumferential surface of the roller is composed of a flat part and a curved part, and the flat part of the roller includes a first flat part on which the source cover part is seated and a second flat part on which the source cover part and the control cover part are seated. The second flat part may be closer to the center of the roller than the first flat part.

According to another feature of the present invention, the through hole may extend from an area adjacent to the lower edge of the source cover portion to a partial area of the back cover facing the second flat portion.

According to another feature of the present invention, the control cover unit may include a control base plate fixed to the opposite side of one surface of the back cover, on which the control printed circuit board is disposed, and a control cover plate covering the control printed circuit board and the control base plate.

According to another feature of the present invention, a plurality of openings may be arranged in the control cover plate.

According to another feature of the present invention, the back cover may further include an edge reinforcement part disposed at a boundary between the plurality of openings and through holes disposed to overlap at least the display panel.

A display device according to another embodiment of the present invention includes a display panel, a plurality of source printed circuit boards electrically connected to the display panel, a back cover supporting the display panel and the plurality of source printed circuit boards, including a through hole and a plurality of openings, on which the display panel and the back cover are wound or unwound, a roller formed of a flat portion and a curved portion, electrically connected to the plurality of source printed circuit boards, electrically connected to a control printed circuit board disposed outside the roller, the plurality of source printed circuit boards and the control printed circuit board, and passing through the through hole. Includes a plurality of flexible cables.

According to another feature of the present invention, a source cover portion disposed to cover a plurality of source printed circuit boards and having a curved surface is further included, and in a fully wound state, the curved surface of the source cover portion may form a circular shape with the curved portion of the roller.

According to another feature of the present invention, a housing portion accommodating the back cover and the display panel may be further included, the control printed circuit board may be disposed on an inner surface of the housing portion facing the rear surface of the back cover, and at least a portion of the plurality of flexible cables may be fixed on the rear surface of the back cover in a direction away from the roller.

According to another feature of the present invention, a control cover portion disposed to cover the control printed circuit board on the rear surface of the back cover may be further included, and the flat portion of the roller may include a second flat portion on which the control cover portion is seated and a first flat portion other than the second flat portion.

According to another feature of the present invention, the through hole may be disposed from a portion overlapping the second plane portion to a portion adjacent to the lower edge of the control cover portion in a state in which the back cover is wound around the roller one turn.

According to another feature of the present invention, the back cover may further include an edge reinforcement portion disposed at an edge of the through hole.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified without departing from the technical spirit of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100, 1000: display device
110, 1010, 1510: back cover
111: opening
120: display panel
121 Substrate
122: buffer layer
123: pixel unit
124: encapsulation layer
125: encapsulation substrate
130: flexible film
140: source printed circuit board
140C: source cover part
141C: sauce base plate
142C: sauce cover plate
150: flexible cable
160: control printed circuit board
160C: control cover
161C: Control base plate
162C: Control cover plate
163C: opening
170: roller unit
171: roller
171F, 1071F: flat part
1071 Fa: first flat part
1071Fb: second planar part
171R, 1071R: curved part
171G: guide roller
172: roller support
173: roller rotating part
180: lifting part
181: link support
182: link unit
183: link lifting unit
184: head bar
182L: link
184a: first head bar
184b: second head bar
AA: display area
AD1: first adhesive layer
AD2: second adhesive layer
AD3: third adhesive layer
AD4: fourth adhesive layer
AD5: fifth adhesive layer
AD6: 6th adhesive layer
AH1: first fastening hole
AH2: second fastening hole
DP: Display
DR1: first direction
DR2: second direction
ERA: edge reinforcement part
HP: housing part
HPF: bottom side
HPO: Orifice
MA: ductile region
MA1: first flexible region
MA2: second flexible region
MA3: third flexible region
MP: driving part
NA: non-display area
PA: support area
PA1: first support area
PA2: second support area
PA3: third support area
PN: Pam Nut
SC: screw

Claims (20)

a display panel in which a plurality of pixels are defined;
a back cover supporting the display panel on a rear surface of the display panel and having a through hole;
a plurality of flexible films electrically connected to one end of the display panel and disposed on one surface of the back cover;
a source printed circuit board electrically connected to the plurality of flexible films and disposed on one side of the back cover;
a control printed circuit board electrically connected to the source printed circuit board and disposed on a surface opposite to one surface of the back cover;
a flexible cable electrically connecting the source printed circuit board and the control printed circuit board through the through hole;
a source cover unit disposed on one side of the back cover to accommodate the source printed circuit board; and
and a control cover portion disposed on a surface opposite to one surface of the back cover to accommodate the control printed circuit board. According to claim 1,
a housing portion accommodating the back cover and the display panel; and
The display device further comprises a roller on which the back cover and the display panel are wound or unwinded. According to claim 2,
At least a portion of the flexible cable is fixed to the display panel from a side opposite to one surface of the back cover. According to claim 3,
Further comprising an adhesive layer disposed extending from an upper boundary of the through hole to the display panel on a side opposite to one surface of the back cover,
The display device, wherein the flexible cable is fixed to a surface side opposite to one surface of the back cover by the adhesive layer. According to claim 3,
In a state in which the display panel and the back cover are fully wound around the roller, the flexible cable is disposed between at least a portion of a surface opposite to one surface of the back cover and at least a portion of an upper surface of the front surface of the display panel and is wound around the roller. Display device. According to claim 2,
The display device of claim 1 , wherein the control printed circuit board is disposed outside the roller. According to claim 6,
The display device of claim 1 , wherein the control printed circuit board is disposed on a surface opposite to one surface of the back cover so as to overlap the source printed circuit board. According to claim 7,
A display device comprising a D shape including a plurality of openings in a shape of the entirety of the source cover part and the control cover part. According to claim 8,
In a state in which the display panel and the back cover are fully wound around the roller, an outer surface of the control cover part is in contact with an outer circumferential surface of the roller. According to claim 8,
The outer circumferential surface of the roller is composed of a flat portion and a curved portion,
The flat part of the roller,
a first flat part on which the source cover part is seated; and
A second flat part on which the source cover part and the control cover part are seated,
The second flat part is closer to the center of the roller than the first flat part. According to claim 10,
The through hole extends from a lower edge of the source cover part to a partial area of the back cover facing the second flat part. According to claim 8,
The control cover part,
a control base plate fixed to a surface opposite to one surface of the back cover and on which the control printed circuit board is disposed; and
and a control cover plate covering the control printed circuit board and the control base plate. According to claim 12,
A display device, wherein a plurality of openings are disposed in the control cover plate. According to claim 1,
The back cover,
a plurality of openings disposed to overlap at least the display panel; and
The display device further includes an edge reinforcement portion disposed at a boundary of the through hole. display panel;
a plurality of source printed circuit boards electrically connected to the display panel;
a back cover supporting the display panel and the plurality of source printed circuit boards and including a through hole and a plurality of openings;
a roller on which the display panel and the back cover are wound or unwound, and formed of a flat part and a curved part;
a control printed circuit board electrically connected to the plurality of source printed circuit boards and disposed outside the roller;
a plurality of flexible cables electrically connecting the plurality of source printed circuit boards and the control printed circuit board and passing through the through hole;
a source cover unit disposed on one side of the back cover to accommodate the source printed circuit board; and
and a control cover portion disposed on a surface opposite to one surface of the back cover to accommodate the control printed circuit board. According to claim 15,
The source cover part is made of a curved surface,
In a state in which the display panel and the back cover are fully wound around the roller, the curved surface of the source cover part forms a circular shape with the curved surface part of the roller. According to claim 16,
A housing unit accommodating the back cover and the display panel;
The control printed circuit board is disposed on an inner surface of the housing portion facing the rear surface of the back cover,
At least a portion of the plurality of flexible cables is fixed in a direction away from the roller on the rear surface of the back cover. According to claim 16,
The display device of claim 1 , wherein the flat surface of the roller includes a second flat surface on which the control cover is seated and a first flat surface other than the second flat surface. According to claim 18,
The display device, wherein the through hole is disposed from a portion overlapping the second flat portion to a lower edge of the control cover portion in a state in which the back cover is wound around the roller once. According to claim 16,
The display device, wherein the back cover further includes an edge reinforcement portion disposed at an edge of the through hole.