KR20210082061A - Stretchable display device - Google Patents

Abstract

The present invention relates to a stretchable display device. According to an embodiment of the present invention, a stretchable display device includes: a plurality of first substrates which is disposed on a lower substrate to be spaced apart from each other and includes at least one pixel; a plurality of connection substrates which connects adjacent first substrates among the plurality of first substrates; and a plurality of connection lines which electrically connects pads disposed on the plurality of adjacent first substrates and is disposed on side surfaces of the plurality of connection substrates. Therefore, a resistance of the connection line may be minimized.

Description

Stretchable display device {STRETCHABLE DISPLAY DEVICE}

The present invention relates to a stretchable display device, and more particularly, to a stretchable display device including a connection line.

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

A display device is being applied to a personal portable device as well as a computer monitor and TV, and research on a display device having a large display area and reduced volume and weight is being conducted.

In addition, in recent years, a stretchable display device manufactured to be stretchable in a specific direction and change into various shapes by forming a display unit and wiring on a flexible substrate such as plastic, which is a flexible material, is a next-generation display device. is attracting attention as

SUMMARY OF THE INVENTION An object of the present invention is to provide a stretchable display device capable of minimizing wiring resistance.

Another object of the present invention is to provide a stretchable display device capable of securing sufficient elongation.

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

A stretchable display device according to an exemplary embodiment includes a plurality of first substrates disposed to be spaced apart from each other on a lower substrate and on which at least one pixel is formed, and a plurality of first substrates adjacent to each other among the plurality of first substrates. a plurality of connecting portions connecting the substrates; and a plurality of connection wires electrically connecting pads disposed on a plurality of first substrates adjacent to each other and disposed on side surfaces of the plurality of connection parts, thereby minimizing resistance of the connection wires.

The details of other embodiments are included in the detailed description and drawings.

According to the present invention, by forming the connection wiring on the side of the connection part, the resistance of the connection wiring can be drastically reduced.

According to the present invention, the elongation can be improved by minimizing the width of the connecting wiring in the curved region.

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

1 is an exploded perspective view of a stretchable display device according to an exemplary embodiment.
2 is an enlarged plan view of a stretchable display device according to an exemplary embodiment.
FIG. 3 is a cross-sectional view III-III′ of FIG. 4 .
4 is a plan view illustrating one pixel of a stretchable display device according to an exemplary embodiment.
FIG. 5 is a cross-sectional view taken along line V-V' of FIG. 4 .
6 is a plan view illustrating one pixel of a stretchable display device according to another exemplary embodiment of the present invention.
7 is a cross-sectional view taken along VII-VII' of FIG. 6 .
8 is a plan view illustrating one pixel of a stretchable display device according to another exemplary embodiment.
9 is a cross-sectional view IX-IX' of FIG. 8 .
10 is a plan view illustrating one pixel of a stretchable display device according to another exemplary embodiment of the present invention.
11 is a cross-sectional view XI-XI′ of FIG. 10 .
12 is a perspective view illustrating a connection line of a stretchable display device according to another exemplary embodiment of the present invention.
13 is a cross-sectional view taken along line XIII-XIII' of FIG. 12 .
14A is a simulation result of measuring the stretching stress of a conventional stretchable display device.
14B is a simulation result of measuring stretching stress of a stretchable display device according to another exemplary embodiment of the present invention.
15 is a diagram illustrating a connection line of a stretchable display device according to another exemplary embodiment of the present invention.
16A is a simulation result of measuring the stretching stress of a conventional stretchable display device.
16B is a simulation result of measuring stretching stress of a stretchable display device according to another exemplary embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent 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, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have 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 to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When 'include', 'have', 'consists of', etc. mentioned in the present invention are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

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

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between the two parts unless 'directly' is used.

Reference to a device or layer “on” another device or layer includes any intervening layer or other device directly on or in the middle of another device.

Also, although the 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. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

Like reference numerals refer to like elements throughout.

The area and thickness of each component shown in the drawings are 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 may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be implemented independently of each other or may be implemented together in a related relationship. may be

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

<Stretchable display device>

The stretchable display device may be referred to as a display device capable of displaying an image even if it is bent or stretched. The stretchable display device may have high flexibility compared to a conventional general display device. Accordingly, the shape of the stretchable display device may be freely changed according to a user's manipulation such as bending or stretching the stretchable display device. For example, when the user grabs and pulls the end of the stretchable display device, the stretchable display device may be stretched by the user's force. Alternatively, when a user arranges the stretchable display device on a non-flat wall surface, the stretchable display device may be disposed to be bent along the shape of the surface of the wall surface. Also, when the force applied by the user is removed, the stretchable display device may return to its original shape.

1 is an exploded perspective view of a stretchable display device according to an exemplary embodiment.

Referring to FIG. 1 , the stretchable display device 100 includes a lower substrate DS, a plurality of first substrates ST1 , a plurality of second substrates ST2 , a plurality of connection supports CS, and a COF. 140 (Chip on Flim), including a printed circuit board (PCB) and an upper board (US).

The lower substrate DS is a substrate for supporting and protecting various components of the stretchable display device 100 . The lower substrate DS is a soft substrate or a flexible substrate and may be formed of an insulating material that can be bent or stretched. For example, the lower substrate DS is made of an elastomer such as silicone rubber such as polydimethylsiloxane (PDMS), polyurethane (PU), or polytetrafluoroethylene (PTFE), Accordingly, it may have a flexible property. However, the material of the lower substrate DS is not limited thereto.

The lower substrate DS is a flexible substrate, and may reversibly expand and contract. In addition, the elastic modulus (elastic modulus) may be several MPa to several hundred MPa, for example, may be 0.5 MPa to 1 MPa. In addition, the lower substrate DS may have a stretch failure rate of 100% or more. Here, the elongation fracture rate refers to the elongation rate at the time when the elongated object is destroyed or cracked. The thickness of the lower substrate DS may be 10 μm to 1 mm, but is not limited thereto.

The lower substrate DS may include a display area AA and a non-display area NA surrounding the display area AA.

The display area AA is an area in which an image is displayed in the stretchable display device 100 , in which a display element and various driving elements for driving the display element are disposed. The display area AA includes a plurality of pixels including a plurality of sub-pixels. The plurality of pixels are disposed in the display area AA and include a plurality of display elements. Each of the plurality of sub-pixels may be connected to various wirings. For example, each of the plurality of sub-pixels may be connected to various lines such as a gate line, a data line, a light emitting signal line, a high potential power line, a low potential power line, a reference voltage line, and a compensation signal line.

The non-display area NA is an area adjacent to the display area AA. The non-display area NA is adjacent to the display area AA and surrounds the display area AA. The non-display area NA is an area in which an image is not displayed, and wirings and circuits may be formed therein. For example, a plurality of pads may be disposed in the non-display area NA, and each pad may be connected to each of a plurality of sub-pixels of the display area AA.

A plurality of first substrates ST1 and a plurality of second substrates ST2 are disposed on the lower substrate DS. The plurality of first substrates ST1 may be disposed in the display area AA of the lower substrate DS, and the plurality of second substrates ST2 may be disposed in the non-display area NA of the lower substrate DS. can Although it is illustrated in FIG. 1 that the plurality of second substrates ST2 are disposed above and on the left side of the display area AA in the non-display area NA, the present invention is not limited thereto, and the plurality of second substrates ST2 are disposed in an arbitrary area of the non-display area NA. can be placed.

The plurality of first substrates ST1 and the plurality of second substrates ST2 are rigid substrates, and are respectively independently disposed on the lower substrate DS to be spaced apart from each other. The plurality of first substrates ST1 and the plurality of second substrates ST2 may be more rigid than the lower substrate DS. That is, the lower substrate DS may have more flexible characteristics than the plurality of first substrates ST1 and the plurality of second substrates ST2 , and the plurality of first substrates ST1 and the plurality of second substrates ST2 . ) may have more rigidity than the lower substrate DS.

The plurality of first substrates ST1 and the plurality of second substrates ST2 that are the plurality of rigid substrates may be made of a plastic material having flexibility, for example, polyimide (PI); It may be made of polyacrylate, polyacetate, or the like. In this case, the plurality of first substrates ST1 and the plurality of second substrates ST2 may be made of the same material, but are not limited thereto, and may be made of different materials.

The modulus of the plurality of first substrates ST1 and the plurality of second substrates ST2 may be higher than that of the lower substrate DS. The modulus is an elastic modulus indicating a ratio of deformation by stress to stress applied to the substrate. When the modulus is relatively high, hardness may be relatively high. Accordingly, the plurality of first substrates ST1 and the plurality of second substrates ST2 may be a plurality of rigid substrates having rigidity compared to the lower substrate DS. The modulus of the plurality of first substrates ST1 and the plurality of second substrates ST2 may be 1000 times greater than the modulus of the lower substrate DS, but is not limited thereto. For example, elastic modulus of the plurality of first substrates ST1 and the plurality of second substrates ST2 may be 2 GPa to 9 GPa depending on transparency. More specifically, when the plurality of first substrates ST1 and the plurality of second substrates ST2 are transparent, the elastic modulus is 2 GPa, and the plurality of first substrates ST1 and the plurality of second substrates ST2 are transparent. In this opaque case, the modulus of elasticity is 9 GPa.

The COF 140 is a film in which various components are disposed on the flexible base film 141 , and is a component for supplying signals to a plurality of sub-pixels of the display area AA. The COF 140 may be bonded to a plurality of pads of the plurality of second substrates ST2 disposed in the non-display area NA, and a power voltage, a data voltage, a gate voltage, etc. may be applied to the display area AA through the pads. is supplied to each of a plurality of sub-pixels of The COF 140 includes a base film 141 and a driving IC 142 , and various components may be disposed in addition to this.

The base film 141 is a layer supporting the driving IC 142 of the COF 140 . The base film 141 may be made of an insulating material, for example, may be made of an insulating material having flexibility.

The driving IC 142 is a component that processes data for displaying an image and a driving signal for processing the data. 1 shows that the driving IC 142 is mounted in the COF 140 method, but is not limited thereto, and the driving IC 142 is mounted in a COG (Chip On Glass), TCP (Tape Carrier Package) method, etc. could be

In FIG. 1 , one second substrate ST2 is disposed in the non-display area NA above the display area AA to correspond to the first substrates ST1 in one row disposed in the display area AA, Although it is illustrated that one COF 140 is disposed on one second substrate ST2, the present invention is not limited thereto. That is, one second substrate ST2 and one COF 140 may be disposed to correspond to the plurality of rows of the first substrate ST1 .

A control unit such as an IC chip or a circuit unit may be mounted on the printed circuit board (PCB). In addition, a memory, a processor, etc. may be mounted on the printed circuit board (PCB). The printed circuit board (PCB) is a component that transmits a signal for driving the display element from the controller to the display element. Although it has been described in FIG. 1 that one printed circuit board (PCB) is used, the number of printed circuit boards (PCB) is not limited thereto.

Hereinafter, for a more detailed description of the stretchable display device 100 according to an embodiment of the present invention, FIGS. 2 to 3 are also referred to.

<Plane and cross-sectional structure>

2 is an enlarged plan view of a stretchable display device according to an exemplary embodiment. FIG. 3 is a cross-sectional view III-III′ of FIG. 4 . For convenience of description, the stretchable display device 100 according to an embodiment of the present invention will be described with reference to FIG. 1 .

2 and 3 , the stretchable display device 100 includes a lower substrate DS, a plurality of first substrates ST1 , a plurality of connection parts CS, a plurality of connection wires 120 , and a plurality of the plurality of first substrates ST1 . It includes a pad 130 , a transistor 150 and an LED 160 .

1 and 2 , a plurality of first substrates ST1 is disposed on the lower substrate DS of the display area AA. The plurality of first substrates ST1 are spaced apart from each other and disposed on the lower substrate DS. For example, the plurality of first substrates ST1 may be disposed in a matrix form on the lower substrate DS as shown in FIGS. 1 and 2 , but is not limited thereto.

1 and 2 , a plurality of sub-pixels SPX constituting the plurality of pixels PX may be disposed on the plurality of first substrates ST1 , and a display of the plurality of second substrates ST2 may be disposed. The gate driver GD may be mounted on the second substrate ST2 located on the left side of the area AA. The gate driver GD may be formed on the second substrate ST2 by a gate in panel (GIP) method when various components on the first substrate ST1 are manufactured. Accordingly, various circuit configurations constituting the gate driver GD such as various transistors, capacitors, and wiring may be disposed on the plurality of second substrates ST2 . However, the present invention is not limited thereto, and the gate driver GD may be mounted in a chip on film (COF) method. In addition, the plurality of second substrates ST2 are disposed in the non-display area NA located on the right side of the display area AA, and the gate driver is also disposed on the plurality of second substrates ST2 located on the right side of the display area AA. (GD) may be mounted.

Referring to FIG. 1 , sizes of the plurality of second substrates ST2 may be larger than sizes of the plurality of first substrates ST1 . In detail, the size of each of the plurality of second substrates ST2 may be greater than the size of each of the plurality of first substrates ST1 . As described above, the gate driver GD is disposed on each of the plurality of second substrates ST2 , and, for example, one stage of the gate driver GD is disposed on each of the plurality of second substrates ST2 . can Accordingly, since the area occupied by various circuit configurations constituting one stage of the gate driver GD is relatively larger than the area of the first substrate ST1 on which the pixel PX is disposed, the plurality of second substrates ST2 ) each may have a size greater than a size of each of the plurality of first substrates ST1 .

1 and 2 , between a plurality of first substrates ST1 , between a plurality of second substrates ST2 , or between a plurality of first substrates ST1 and a plurality of second substrates ST2 , a plurality of A connection part CS is disposed. The plurality of connection parts CS may be a first substrate ST1 adjacent to each other, a second substrate ST2 adjacent to each other, or a substrate connecting the first substrate ST1 and the second substrate ST2 adjacent to each other. . The plurality of connection parts CS may be simultaneously and integrally formed of the same material as that of the first substrate ST1 or the second substrate ST2 , but is not limited thereto.

Referring to FIG. 2 , the plurality of connection parts CS have a curved shape on a plane. For example, as shown in FIG. 2 , the plurality of connection parts CS may have a sinusoidal shape. However, the shape of the plurality of connection parts CS is not limited thereto, and for example, the plurality of connection parts CS may extend in a zigzag shape, and a plurality of rhombus-shaped substrates are connected at vertices to extend, etc. It may have various shapes. In addition, the number and shape of the plurality of connection parts CS illustrated in FIG. 2 are exemplary, and the number and shape of the plurality of connection parts CS may be variously changed according to design.

Referring to FIG. 3 , a buffer layer 112 is disposed on the plurality of first substrates ST1 . The buffer layer 112 protects various components of the stretchable display device 100 from penetration of moisture (H2O) and oxygen (O2) from outside the lower substrate DS and the plurality of first substrates ST1 . It is formed on the plurality of first substrates ST1 for this purpose. The buffer layer 112 may be made of an insulating material, and for example, an inorganic layer made of silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), etc. may be formed of a single layer or multiple layers. However, the buffer layer 112 may be omitted depending on the structure or characteristics of the stretchable display device 100 .

The buffer layer 112 may be formed only in a region where the lower substrate DS overlaps the plurality of first substrates ST1 and the plurality of second substrates ST2 . As described above, since the buffer layer 112 may be made of an inorganic material, cracks may be easily generated in the process of stretching the stretchable display device 100 and may be damaged. Accordingly, the buffer layer 112 is not formed in the region between the plurality of first substrates ST1 and the plurality of second substrates ST2 , but is formed between the plurality of first substrates ST1 and the plurality of second substrates ST2 . The patterned shape may be formed only on the plurality of first substrates ST1 and the plurality of second substrates ST2 . In other words, the buffer layer 112 may not be formed on the plurality of connection parts CS. Accordingly, in the stretchable display device 100 according to the exemplary embodiment of the present invention, the buffer layer 112 is formed only in regions overlapping the plurality of first substrates ST1 and the plurality of second substrates ST2 that are rigid substrates. Accordingly, even when the stretchable display 100 is deformed, such as bent or stretched, damage to the buffer layer 112 can be prevented.

Referring to FIG. 3 , a transistor 150 including a gate electrode 151 , an active layer 152 , a source electrode 153 , and a drain electrode 154 is formed on the buffer layer 112 .

First, referring to FIG. 3 , an active layer 152 is disposed on the buffer layer 112 . For example, the active layer 152 may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or an organic semiconductor. can

A gate insulating layer 113 is disposed on the active layer 152 . The gate insulating layer 113 is a layer for electrically insulating the gate electrode 151 and the active layer 152 and may be made of an insulating material. For example, the gate insulating layer 113 may be formed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. it's not going to be

A gate electrode 151 is disposed on the gate insulating layer 113 . The gate electrode 151 is disposed to overlap the active layer 152 . The gate electrode 151 may be formed of various metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and It may be any one of copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

An interlayer insulating layer 114 is disposed on the gate electrode 151 . The interlayer insulating layer 114 is a layer for insulating the gate electrode 151 , the source electrode 153 , and the drain electrode 154 , and may be made of an inorganic material similar to the buffer layer 112 . For example, the interlayer insulating layer 114 may be formed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. it's not going to be

A source electrode 153 and a drain electrode 154 in contact with the active layer 152 are disposed on the interlayer insulating layer 114 . The source electrode 153 and the drain electrode 154 are spaced apart from each other on the same layer. The source electrode 153 and the drain electrode 154 may be electrically connected to the active layer 152 in a manner in contact with the active layer 152 . The source electrode 153 and the drain electrode 154 may be formed of various metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), It may be any one of neodymium (Nd) and copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

In addition, the gate insulating layer 113 and the interlayer insulating layer 114 may be patterned and formed only in regions overlapping the plurality of first substrates ST1 . Since the gate insulating layer 113 and the interlayer insulating layer 114 may also be made of the same inorganic material as the buffer layer 112 , cracks may be easily generated during stretching of the stretchable display device 100 and may be damaged. . Accordingly, the gate insulating layer 113 and the interlayer insulating layer 114 are not formed in the region between the plurality of first substrates ST1 , but are patterned in the shape of the plurality of first substrates ST1 to form the plurality of first substrates. (ST1) It can be formed only in the upper part.

3 illustrates only a driving transistor among various transistors that may be included in the stretchable display device 100 for convenience of explanation, but a switching transistor, a capacitor, and the like may also be included in the display device. In addition, although it has been described herein that the transistor 150 has a coplanar structure, various transistors such as a staggered structure may also be used.

Referring to FIG. 3 , a plurality of pads 130 are disposed on the interlayer insulating layer 114 . Although the drawings show that the plurality of pads 130 are disposed on the first substrate ST1 , the plurality of pads 130 may also be disposed on the second substrate ST2 . The plurality of pads 130 transmit any one of various signals such as a gate signal, a data signal, a light emitting signal, a high potential power signal, a low potential power signal, a reference voltage signal, and a compensation signal to the plurality of sub-pixels SPX. It may be a pad for the purpose, but is not limited thereto. In addition, the plurality of pads 130 may be made of the same material as the source electrode 153 and the drain electrode 154 , but is not limited thereto.

The plurality of pads 130 includes a first pad 131 and a second pad 132 . The first pad 131 may be connected to the first connection line 121 . In addition, the second pad 132 may be connected to the second connection wire 122 .

Referring to FIG. 3 , a planarization layer 115 is formed on the transistor 150 and the interlayer insulating layer 114 . The planarization layer 115 planarizes an upper portion of the transistor 150 . The planarization layer 115 may be formed of a single layer or a plurality of layers, and may be formed of an organic material. Accordingly, the planarization layer 115 may be referred to as an organic insulating layer. For example, the planarization layer 115 may be made of an acryl-based organic material, but is not limited thereto.

Referring to FIG. 3 , the planarization layer 115 is disposed on the plurality of first substrates ST1 to cover upper surfaces and side surfaces of the buffer layer 112 , the gate insulating layer 113 , and the interlayer insulating layer 114 , of the buffer layer 112 , the gate insulating layer 113 , and the interlayer insulating layer 114 together with the first substrate ST1 of FIG. Specifically, the planarization layer 115 covers the upper surface and side surfaces of the interlayer insulating layer 114 , the side surface of the gate insulating layer 113 , the side surface of the buffer layer 114 , and a portion of the upper surfaces of the plurality of first substrates ST1 . It can be arranged to

The planarization layer 115 may compensate for a step difference in the side surfaces of the buffer layer 112 , the gate insulating layer 113 , and the interlayer insulating layer 114 , and is disposed on the side surfaces of the planarization layer 115 and the planarization layer 115 . It is possible to increase the adhesive strength of the connecting wiring 120 to be used. For example, the side surface of the planarization layer 115 may have a gentler slope than the slope formed by the side surface of the interlayer insulating layer 112 , the side surface of the gate insulating layer 113 , and the side surface of the buffer layer 114 . Accordingly, the connection wiring 120 disposed in contact with the side surface of the planarization layer 115 is disposed with a gentle inclination to reduce stress generated in the connection wiring 120 when the stretchable display device 100 is stretched. and it is possible to suppress a phenomenon in which the connection wiring 120 is cracked or peeled off from the side surface of the planarization layer 115 .

In some embodiments, a passivation layer may be formed between the transistor 150 and the planarization layer 115 . That is, in order to protect the transistor 150 from penetration of moisture and oxygen, a passivation layer covering the transistor 150 may be formed. The passivation layer may be made of an inorganic material, and may be formed of a single layer or a multilayer, but is not limited thereto.

Referring to FIG. 3 , a common line CL is disposed on the gate insulating layer 113 . The common wiring CL is a wiring that applies a common voltage to the plurality of sub-pixels SPX. The common wiring CL may be made of the same material as the gate electrode 151 of the transistor 150 , but is not limited thereto.

Referring to FIG. 3 , a first connection pad 191 and a second connection pad 192 are disposed on the planarization layer 115 . The first connection pad 191 is an electrode for electrically connecting the LED 160 and the transistor 150, which will be described later. For example, the first connection pad 191 may electrically connect the drain electrode 154 of the transistor 150 and the LED 160 through a contact hole formed in the planarization layer 115 .

The second connection pad 192 is an electrode for electrically connecting the LED 160 and the common line CL. For example, the second connection pad 192 may electrically connect the common line CL and the LED 160 through a contact hole formed in the planarization layer 115 .

Referring to FIG. 3 , the LED 160 is disposed on the first connection pad 191 and the second connection pad 192 . The LED 160 includes an n-type layer 161 , an active layer 162 , a p-type layer 163 , an n-electrode 164 , and a p-electrode 165 . The LED 160 of the stretchable display device 100 according to an embodiment of the present invention has a flip-chip structure in which an n-electrode 164 and a p-electrode 165 are formed on one surface. .

The n-type layer 161 may be formed by implanting n-type impurities into gallium nitride (GaN). The n-type layer 161 may be disposed on a separate base substrate made of a material capable of emitting light.

An active layer 162 is disposed on the n-type layer 161 . The active layer 162 is a light emitting layer emitting light from the LED 160 , and may be made of a nitride semiconductor, for example, indium gallium nitride (InGaN). A p-type layer 163 is disposed on the active layer 162 . The p-type layer 163 may be formed by implanting p-type impurities into gallium nitride (GaN).

LED 160 according to an embodiment of the present invention, as described above, after sequentially stacking the n-type layer 161, the active layer 162, and the p-type layer 163, after etching a predetermined portion, It is manufactured in such a way that the n-electrode 164 and the p-electrode 165 are formed. At this time, the predetermined portion is a space for separating the n-electrode 164 and the p-electrode 165 , and the predetermined portion is etched to expose a portion of the n-type layer 161 . In other words, the surface of the LED 160 on which the n-electrode 164 and the p-electrode 165 are to be disposed may have different height levels, not the planarized surface.

In this way, the n-electrode 164 is disposed on the etched region, that is, the n-type layer 161 exposed through the etching process. The n-electrode 164 may be made of a conductive material. Meanwhile, the p-electrode 165 is disposed on the non-etched region, that is, the p-type layer 163 . The p-electrode 165 may also be made of a conductive material, for example, may be made of the same material as the n-electrode 164 . Each of the above-described p-electrode 165 and n-electrode 164 may be defined as a first electrode and a second electrode of the LED 160 .

The adhesive layer AD is disposed between the upper surfaces of the first connection pad 191 and the second connection pad 192 and the first connection pad 191 and the second connection pad 192 , so that the LED 160 is connected to the first connection pad 191 and the second connection pad 192 . It may be adhered to the connection pad 191 and the second connection pad 192 . In this case, the n-electrode 164 may be disposed on the second connection pad 192 , and the p-electrode 165 may be disposed on the first connection pad 191 .

The adhesive layer AD may be a conductive adhesive layer in which conductive balls are dispersed on an insulating base member. Accordingly, when heat or pressure is applied to the adhesive layer AD, the conductive balls may be electrically connected to the portion to which the heat or pressure is applied to have a conductive property, and an area that is not pressurized may have an insulating property. For example, the n-electrode 164 is electrically connected to the second connection wiring 122 through the adhesive layer AD, and the p-electrode 165 is electrically connected to the first connection wiring 121 through the adhesive layer AD. is connected to That is, after the adhesive layer AD is applied on the first connection pad 191 and the second connection pad 192 by an inkjet method, the LED 160 is transferred onto the adhesive layer AD, and the LED 160 ) may be electrically connected to the first connection pad 191 and the p-electrode 165 and the second connection pad 192 to the n-electrode 164 by applying heat. However, the portion of the adhesive layer AD disposed between the n-electrode 164 and the second connection pad 192 and the portion of the adhesive layer AD disposed between the p-electrode 165 and the first connection pad 191 are separated. Except for the portion of the adhesive layer AD, the portion has an insulating property.

Meanwhile, the adhesive layer AD may be disposed on each of the first connection pad 191 and the second connection pad 192 in a separated form. That is, the adhesive layer AD disposed between the p-electrode 165 and the first connection pad 191 may be defined as the first adhesive pattern, and disposed between the n-electrode 164 and the second connection pad 192 . The used adhesive layer AD may be defined as a second adhesive pattern.

As described above, the stretchable display device 100 according to an embodiment of the present invention has a structure in which the LED 160 is disposed on the lower substrate DS on which the transistor 150 is disposed, thereby providing a stretchable display. When the device 100 is turned on, different voltage levels applied to each of the first connection pad 191 and the second connection pad 192 are transmitted to the n-electrode 164 and the p-electrode 165, respectively. (160) is emitted.

Meanwhile, although it is illustrated that the bank is not used in FIG. 3 , the bank may be formed on the first connection pad 191 , the second connection pad 192 , the connection wire 120 , and the planarization layer 115 . The bank may be disposed on one side and the other side of the LED 160 to distinguish adjacent sub-pixels SPX. The bank may be made of an insulating material. Also, the bank may include a black material. The bank serves to cover wirings that can be viewed through the display area AA by including a black material. The bank may, for example, be made of a transparent carbon-based mixture, and specifically include carbon black. However, the present invention is not limited thereto, and the bank may be formed of a transparent insulating material.

1 and 3 , an upper substrate US is disposed on the LED 160 and the lower substrate DS. The upper substrate US is a substrate supporting various components disposed under the upper substrate US. Specifically, the upper substrate US is formed by coating a material constituting the upper substrate US on the lower substrate DS and then curing the lower substrate DS, the first substrate ST1, and the second substrate US. 2 It may be disposed to contact the substrate ST2 and the connection part CS.

The upper substrate US is a flexible substrate and may be formed of an insulating material that can be bent or stretched. The upper substrate US is a flexible substrate, and may reversibly expand and contract. Also, the elastic modulus may be several MPa to several hundred MPa, and the elongation failure rate may be 100% or more. The thickness of the upper substrate US may be 10 μm to 1 mm, but is not limited thereto.

The upper substrate US may be made of the same material as the lower substrate DS. For example, the upper substrate US may be made of an elastomer such as silicone rubber such as polydimethylsiloxane (PDMS), polyurethane (PU), or polytetrafluoroethylene (PTFE). , thus, may have flexible properties. However, the material of the upper substrate US is not limited thereto.

Meanwhile, although not shown in FIG. 3 , a polarizing layer may be disposed on the upper substrate US. The polarization layer may polarize light incident from the outside of the stretchable display device 100 to reduce external light reflection. In addition, an optical film other than the polarizing layer may be disposed on the upper substrate US.

2 and 3 , a plurality of connection wires 120 are disposed on the planarization layer 115 and the plurality of connection parts CS. The plurality of connection wires 120 are wires that electrically connect the plurality of pads 130 adjacent to each other. In this case, the connection wiring 120 and the pad 130 may be connected to each other through a contact hole formed in the planarization layer 115 . The plurality of connection wirings 120 may be composed of one of various wirings such as a gate wiring, a data wiring, a light emitting signal wiring, a high potential power wiring, a low potential power wiring, a reference voltage wiring, a compensation signal wiring, and the like. no.

The plurality of connection wires 120 may be disposed between two adjacent first substrates ST1 to electrically connect the two first substrates ST1 . Specifically, the plurality of connection wirings 120 may be disposed on top, side, and side surfaces of the connection part CS connecting the two adjacent first substrates ST1 and the two adjacent second substrates ST2 to each other. . In addition, the plurality of connection wirings 120 may be disposed between two adjacent second substrates ST2 and between the first and second substrates ST1 and ST2 adjacent to each other.

In a region corresponding to the connection part CS, the plurality of connection wires 120 may be formed in the same shape as the plurality of connection parts CS and overlap each other. That is, the plurality of connection wires 120 may have the same curved shape as the plurality of connection parts CS above the plurality of connection parts CS.

The plurality of connection wires 120 includes a first connection wire 121 and a second connection wire 122 . The first connection wiring 121 and the second connection wiring 122 may be formed between the plurality of first substrates ST1 , between the plurality of second substrates ST2 , or between the plurality of first substrates ST1 and the plurality of second substrates. (ST2) can be disposed between.

The first connection wiring 121 may be in contact with the top and side surfaces of the planarization layer 115 disposed on the first substrate ST1 and may extend to the top and side surfaces of the connection part CS. Also, the second connection wiring 122 may be in contact with the top and side surfaces of the planarization layer 115 disposed on the first substrate ST1 and may extend to the top and side surfaces of the connection part CS.

1 and 2 , the first connection wiring 121 means a wiring extending in the X-axis direction among the plurality of connection wirings 120 , and the second connection wiring 122 is a wiring extending in the X-axis direction among the plurality of connection wirings 120 . It may mean a wiring extending in the Y-axis direction. The first connection wire 121 and the second connection wire 122 may be configured to transmit different signals to the plurality of sub-pixels SPX. That is, the signal transmitted by the first connection line 121 and the signal transmitted by the second connection line 122 may be different from each other.

The plurality of connection wires 120 may be made of a metal material such as copper (Cu), aluminum (Al), titanium (Ti), or molybdenum (Mo) or copper/molybdenum-titanium (Cu/Moti), titanium/aluminum/titanium (Ti) /Al/Ti) may be formed of a laminated structure of a metal material, but is not limited thereto.

The display device includes various signal wirings such as gate wirings, data wirings, light emitting signal wirings, high potential power wirings, low potential power wirings, reference voltage wirings, compensation signal wirings, and the like. In the case of a general display device, various signal lines are disposed to extend linearly between a plurality of sub-pixels, and the plurality of sub-pixels are connected to one signal line. Accordingly, in the case of a general display device, various signal wirings extend from one side of the display device to the other without interruption on the substrate.

In contrast, in the case of the stretchable display device 100 according to the exemplary embodiment of the present invention, the signal wiring having a linear shape, which can be considered to be used in a general display device, includes the plurality of first substrates ST1 and the plurality of second substrates ST1 . 2 It is disposed only on the substrate ST2. That is, in the stretchable display device 100 according to the exemplary embodiment of the present invention, the linear signal line is disposed only on the plurality of first substrates ST1 and the plurality of second substrates ST2 .

In the stretchable display device 100 according to an embodiment of the present invention, adjacent substrates ST1 and ST2 are adjacent to each other in order to connect discontinuous wirings on the first substrate ST1 or the second substrate ST2. The upper pad 130 may be connected by a connection wire 120 . That is, the connection wiring 120 electrically connects two adjacent first and second substrates ST1 and ST2 and the pads 130 on the first and second substrates ST1 and ST2. do. Accordingly, in the stretchable display device 100 according to an exemplary embodiment of the present invention, a signal having a linear shape on the plurality of first substrates ST1 and the plurality of second substrates ST2 by the plurality of connection wires 120 is provided. The wires may be electrically connected to each other.

For example, a gate line may be disposed on the plurality of first substrates ST1 disposed adjacent to each other in the X-axis direction, and gate pads may be disposed at both ends of the gate line. For example, the first pad 131 may be one of the gate pads disposed at both ends of the gate line of the sub-pixel SPX. The first connection wiring 121 may function as a gate wiring. In addition, the first pads 131 on the plurality of first substrates ST1 disposed adjacent to each other in the X-axis direction may be connected to each other by the first connection wires 121 on the connection part CS. Accordingly, the gate wire disposed on the plurality of first substrates ST1 and the first connection wire 121 disposed on the connection part CS may function as one gate wire. Accordingly, one gate signal is transmitted to the gate electrodes (SPX) of the plurality of sub-pixels through the first pad 131 , the first connection wire 121 , and the gate wires respectively disposed on the plurality of first substrates ST1 . 151) can be transferred.

Also, a data line may be disposed on the plurality of first substrates ST1 disposed adjacent to each other in the Y-axis direction, and data pads may be disposed at both ends of the data line. For example, the second pad 132 may be one of data pads disposed at both ends of the data line of the sub-pixel SPX. The second connection line 122 may function as a data line. In addition, the second pad 132 and another pad on the plurality of first substrates ST1 disposed adjacent to each other in the Y-axis direction may be connected to each other by the second connection wire 122 on the connection part CS. Accordingly, the data line disposed on the plurality of first substrates ST1 and the second connection line 122 disposed on the connection part CS may function as one data line. Accordingly, one data signal is transmitted to the plurality of sub-pixels SPX through the data lines respectively disposed on the second pad 132 , another pad, the second connection line 122 , and the plurality of first substrates ST1 . can be transmitted to

In addition, the connection wiring 120 connects the pads on the plurality of first substrates ST1 and the plurality of second substrates ST2 to each other or pads on the plurality of second substrates ST2 disposed adjacent to each other in the Y-axis direction. A wiring connecting the pads on the two second substrates ST2 arranged side by side among them may be further included.

<Type of connection wiring>

4 is a diagram illustrating a connection wiring of a stretchable display device according to an exemplary embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line V-V' of FIG. 4 .

Although the form of the connecting wire shown in FIG. 4 and the form of the connecting wire shown in FIG. 2 are partially different, for convenience of explanation, the form of the connecting wire will be described with reference to the connecting wire shown in FIG. 4 . In addition, since the first and second connection wirings differ only in their arrangement directions and have the same practical form, the first connection wiring and the second connection wiring will be described as being integrated as a connection wiring.

Referring to FIG. 4 , each of the plurality of connection parts CS and the plurality of connection wires 420 has a curved shape. As described above, each of the plurality of connection parts CS and the plurality of connection wires 420 may have various shapes such as a sine wave and a zigzag shape.

Accordingly, each of the plurality of connection parts CS and the plurality of connection wires 420 may be disposed in the straight area SA and the curved area CA. That is, an area in which the plurality of connection parts CS and the plurality of connection wires 420 are respectively disposed may be divided into a straight area SA and a curved area CA. In the straight area SA, each of the plurality of connection parts CS and the plurality of connection wires 420 may extend in a straight line without being bent. In addition, in the curved area CA, each of the plurality of connection parts CS and the plurality of connection wires 420 does not extend in a straight line, but may be bent with a predetermined curvature. However, in FIG. 4 , each of the plurality of connection parts CS and the plurality of connection wires 420 is shown to be bent while maintaining a constant curvature in the curved area CA. However, the present invention is not limited thereto, and each of the plurality of connection parts CS and the plurality of connection wires 420 may be bent or bent at a predetermined angle while maintaining a variable curvature in the curved area CA according to design necessity.

Referring to FIG. 5 , the plurality of connection wires 420 may be disposed on both sides of the plurality of connection parts CS. Each of the plurality of connection wirings 420 may be formed as a double wiring in contact with both sides of the connection part CS. That is, each of the plurality of connection wires 420 is not disposed on the upper surface of the connection part CS, but may be disposed on both sides of the connection part CS in the form of double wires. However, the present invention is not limited thereto, and each of the plurality of connection wirings 420 may be formed of a single wiring contacting only one side of both sides according to design necessity.

In addition, the plurality of connection wires 420 may be in contact with the lower substrate DS. However, the present invention is not limited thereto, and the plurality of connection wires 420 may be spaced apart from the lower substrate DS according to design requirements.

In addition, the thickness T1 of the plurality of connection wires 420 may be 0.6 μm to 1 μm.

As described above, in the stretchable display device according to an embodiment of the present invention, the plurality of connection wires 420 may be formed as double wires on both sides of the connection part CS. Accordingly, each of the plurality of connection wirings 420 is connected in parallel, so that wiring resistance may be rapidly reduced. Accordingly, in order to drive the stretchable display device, a delay of a signal applied to the connection line 420 may be minimized. As a result, the display quality of the stretchable display device may be improved.

Also, in the conventional stretchable display device, the plurality of connection wires are disposed only on the upper surface of the connection part, and the plurality of connection wires are disposed in a horizontal direction with respect to the lower substrate. For this reason, when the conventional stretchable display device is stretched, the stretching stress applied to the plurality of connecting wires was measured to be a maximum of 73500 MPa. As a result, in the conventional stretchable display device, cracks are highly likely to occur in a plurality of connecting wires, and thus there is a problem of disconnection.

In contrast, in the stretchable display device according to an embodiment of the present invention, a plurality of connection wires 420 are disposed on both sides of the connection part CS, so that the plurality of connection wires 420 are connected to the lower substrate DS. It can be placed in a vertical direction as a reference. That is, the positions of the plurality of connection wires 420 may be closer to the central axis of curvature of the curved shape of the plurality of connection wires 420 . Accordingly, when the stretchable display device according to the exemplary embodiment is stretched, the stretching stress applied to the plurality of connection wires 420 was measured to be a maximum of 692 MPa. That is, the stretching stress applied to the plurality of connecting wires 420 at the same stretching rate is reduced by up to 100 times or more. For this reason, the stretchable display device according to an embodiment of the present invention can solve the problem of disconnection of the connection wiring 420 . This may improve the stretch reliability of the stretchable display device.

6 is a diagram illustrating a connection wiring of a stretchable display device according to another exemplary embodiment of the present invention. 7 is a cross-sectional view taken along line VII-VII' of FIG. 6 .

Since the stretchable display device according to another exemplary embodiment of the present invention differs from the stretchable display device according to the exemplary embodiment only in the arrangement shape of the connecting wires, a description of overlapping parts will be omitted, and the connection line will be omitted. The arrangement form of the wiring will be specifically described.

As shown in FIG. 6 , the connection wiring 620 of the stretchable display device according to another exemplary embodiment may have different shapes in the straight area SA and the curved area CA.

That is, referring to FIG. 7 , the plurality of connection wirings 620C disposed in the curved area CA are disposed only on both sides of the connection part CS, and the plurality of connection wirings 620S disposed in the straight area SA. is disposed only on the upper surface of the connection part CS. That is, the plurality of connection wires 620C disposed in the curved area CA may be disposed in the form of double wires on both sides of the connection part CS, but the plurality of connection wires 620S disposed in the straight area SA may not It may be disposed on the upper surface of the connection part CS in the form of a single wire.

When the stretchable display device is stretched, a relatively high stretching stress is concentrated in the curved area CA than in the straight area SA. Accordingly, the probability that cracks occur in the plurality of connection wires 620C disposed in the curved area CA is very high. Accordingly, in the stretchable display device according to an embodiment of the present invention, the plurality of connection wires 620C are disposed only on both side surfaces of the connection part CS in the curved area CA so as to be connected to the curved area CA. The plurality of connection wires 620C may be disposed in a vertical direction with respect to the lower substrate DS. That is, the positions of the plurality of connection wires 620C may be closer to the central axis of curvature of the curved shape of the plurality of connection wires 620C. Accordingly, the stretchable display device of the present invention can withstand high stress in the curved area CA, and thus the elongation can be improved.

Also, the thickness T2 of the connection line 620S disposed in the straight area SA and the thickness T1 of the connection line 620C disposed in the curved area CA may be different from each other. That is, the thickness T1 of the connection wire 620C disposed in the curved area CA may be thinner than the thickness T2 of the connection wire 620S disposed in the straight area SA. Accordingly, since the thickness T1 of the connection wiring 620C disposed in the curved area CA is relatively thin, the stretchable display device of the present invention has a curved area CA that is more susceptible to stretching stress than the straight area SA. can withstand relatively high stress in the , the elongation can be improved.

8 is a diagram illustrating a connection line of a stretchable display device according to another exemplary embodiment of the present invention. 9 is a cross-sectional view taken along line IX-IX' of FIG. 8 .

Since the stretchable display device according to another embodiment of the present invention is different from the stretchable display device according to the embodiment only in the shape of the connecting wiring, a description of overlapping parts will be omitted, and the connection line will be omitted. The form of the wiring will be described in detail.

8 and 9 , the plurality of connection wires 820 may be disposed on both sides of the plurality of connection parts CS, and the plurality of connection wires 820 may also be disposed above the plurality of connection parts CS. have. That is, each of the plurality of connection wires 820 may be disposed to cover the outer surface of the connection part CS. In other words, the plurality of connection wires 820 may be divided into an upper connection wire 820U disposed on an upper surface of the plurality of connection parts CS and a lower connection wire 820D disposed on both sides of the plurality of connection parts CS. can

In addition, the plurality of connection wires 820 may be in contact with the lower substrate DS. However, the present invention is not limited thereto, and the plurality of connection wires 820 may be spaced apart from the lower substrate DS according to design requirements.

In addition, the thickness T3 of the lower connection wiring 820D disposed on both sides of the plurality of connection parts CS and the thickness T4 of the upper connection wiring 820U disposed on the upper surface of the plurality of connection parts CS are different from each other. can do. That is, the thickness T3 of the lower connection line 820D may be thinner than the thickness T4 of the upper connection line 820U. For example, the thickness T3 of the lower connection wire 820D may be 0.3 μm to 0.4 μm, but the thickness T4 of the upper connection wire 820U may be 0.6 μm to 1 μm.

As described above, in the stretchable display device according to another embodiment of the present invention, the plurality of connection wires 820 may be formed to cover the outer surface of the connection part CS. Accordingly, the cross-sectional area of the plurality of connection wirings 820 may increase, and thus wiring resistance may be rapidly reduced. Accordingly, in order to drive the stretchable display device, a delay of a signal applied to the connection line 820 may be minimized. As a result, the display quality of the stretchable display device may be improved.

10 is a diagram illustrating a connection line of a stretchable display device according to another exemplary embodiment of the present invention. 11 is a cross-sectional view taken along line XI-XI' of FIG. 10 .

Since the stretchable display device according to another embodiment of the present invention differs from the stretchable display device according to the embodiment only in the arrangement form of the connecting wires 420 , the description of overlapping parts is not provided. It abbreviate|omits and the arrangement|positioning form of connection wiring is demonstrated concretely.

As shown in FIG. 10 , the connection wiring 1020 of the stretchable display device according to another exemplary embodiment may have different shapes in the straight area SA and the curved area CA.

That is, referring to FIG. 11 , the plurality of connection wires 1020S disposed in the straight area SA are disposed on both sides and upper surfaces of the connection part CS, and the plurality of connection wires 1020S disposed in the curved area CA ( 1020C is disposed only on both sides of the connection part CS. That is, the plurality of connection wires 1020S disposed in the straight area SA may be disposed to cover the outer surface of the connection part CS, but the plurality of connection wires 1020C disposed in the curved area CA may be connected to the connection part CS. ) can be arranged in the form of double wiring on both sides.

In other words, the plurality of connection wires 1020S disposed in the straight area SA may include an upper connection wire 1020U disposed on an upper surface of the plurality of connection parts CS and a lower part disposed on both sides of the plurality of connection parts CS. It may be divided by a connection wire 1020D.

When the stretchable display device is stretched, a relatively high stretching stress is concentrated in the curved area CA than in the straight area SA. Accordingly, the probability that cracks occur in the plurality of connection wirings 1020 disposed in the curved area CA is very high. Accordingly, in the stretchable display device according to an embodiment of the present invention, the plurality of connection wires 1020 are disposed only on both sides of the connection part CS in the curved area CA, so that a plurality of the plurality of connection wires 1020 are disposed in the curved area CA. The connection wiring 620C may be disposed in a vertical direction with respect to the lower substrate DS. That is, the positions of the plurality of connection wires 620C may be closer to the central axis of curvature of the curved shape of the plurality of connection wires 620C. Accordingly, the stretchable display device of the present invention can withstand high stress in the curved area CA, and thus the elongation can be improved.

12 is a perspective view illustrating a connection line of a stretchable display device according to another exemplary embodiment of the present invention. 13 is a cross-sectional view taken along line XIII-XIII' of FIG. 12 . 14A is a simulation result of measuring the stretching stress of a conventional stretchable display device. 14B is a simulation result of measuring stretching stress of a stretchable display device according to another exemplary embodiment of the present invention.

In the stretchable display device according to another exemplary embodiment of the present invention, since the connection parts CS1 and CS2 have technical characteristics, the connection parts CS1 and CS2 will be described in detail.

12 and 13 , the connecting portions CS1 and CS2 of the stretchable display according to another exemplary embodiment of the present invention may have different thicknesses in the straight area SA and the curved area CA. can

That is, referring to FIG. 13 , the plurality of first connection parts CS1 disposed in the straight area SA may be thicker than the plurality of second connection parts CS2 disposed in the curved area CA. have. That is, the thickness T5 of each of the plurality of first connection parts CS1 disposed in the straight area SA is the thickness T6 of each of the plurality of second connection parts CS2 disposed in the curved area CA. could be thicker.

However, the connection wiring 1220 disposed on the plurality of first connection parts CS1 disposed in the straight area SA and the connection wire 1220 disposed on the plurality of second connection parts CS2 disposed in the curved area CA 1220 may be formed to have the same thickness.

Accordingly, the component disposed in the straight area SA may be relatively thicker than the component disposed in the curved area CA.

In the case of the conventional stretchable display device, since the thickness of the straight area SA and the thickness of the curved area CA are uniform, stress is concentrated in the curved area CA shown in FIG. 14A and is not easily deformed. Accordingly, since vertical deformation in the curved area CA of the conventional stretchable display device is limited, the stretching direction of the conventional stretchable display device is limited.

However, as shown in FIG. 14B , in the case of the stretchable display device according to another exemplary embodiment of the present invention, since the thickness of the curved area CA is relatively thin, stress may be well distributed in the curved area CA. have. Accordingly, in the case of the stretchable display device according to another exemplary embodiment of the present invention, it may be easy to change the curved area CA in the vertical direction.

As a result, in the stretchable display device according to another exemplary embodiment of the present invention, stress is distributed in all directions, so that there is no limitation in the stretching direction and stretching reliability can be improved.

15 is a diagram illustrating a connection line of a stretchable display device according to another exemplary embodiment of the present invention. 16A is a simulation result of measuring stretching stress of a conventional stretchable display device. 16B is a simulation result of measuring stretching stress of a stretchable display device according to another exemplary embodiment of the present invention.

Since the stretchable display device according to another embodiment of the present invention is different from the stretchable display device according to the embodiment only in the shape of the connecting wiring, a description of overlapping parts will be omitted, and the connection line will be omitted. The form of the wiring will be described in detail.

15 , the connection wiring 1520 of the stretchable display device according to another exemplary embodiment may have different shapes in the straight area SA and the curved area CA.

That is, referring to FIG. 15 , the plurality of connection wires 1520S disposed in the straight area SA may include straight lines, and the plurality of connection wires 1520C disposed in the curved area CA may It may include a curved line and a reinforcement pattern PT. In other words, the plurality of connection wires 1520S disposed in the straight area SA may have a straight line shape having a constant wire width, but the plurality of connection wires 1520C disposed in the curved area CA have a constant wire width. may have a curved shape having , and the reinforcement pattern PT may be disposed on a portion of the plurality of connection wires 1520C disposed in the curved area CA.

The above-described reinforcement pattern PT may have a circular shape, and a diameter of the reinforcement pattern PT may be wider than a wiring width of the plurality of connection wirings 1520S disposed in the straight area SA. However, the shape of the reinforcement pattern PT is not limited to a circular shape, but may be a polygon having a width or a diameter wider than that of the plurality of connection wires 1520S.

In addition, the reinforcement pattern PT may be formed of a metal material such as copper (Cu), aluminum (Al), titanium (Ti), or molybdenum (Mo) or copper/molybdenum-titanium (Cu/Moti) like the connection wiring 1520 . , titanium/aluminum/titanium (Ti/Al/Ti), etc. may be formed of a stacked structure of a metal material, but is not limited thereto.

As illustrated in FIG. 16A , when the conventional stretchable display device is stretched, a relatively high stretching stress is concentrated in the curved area CA. (A region marked in green in FIGS. 16A and 16B means an area in which stress is concentrated, and an area in blue is an area in which stress is less concentrated.) Accordingly, a plurality of connection wirings arranged in the curved area CA The probability of cracking is very high.

Accordingly, in the stretchable display device according to another embodiment of the present invention, cracks occur in the plurality of connection wires 1520 by disposing the connection wiring 1520S including the reinforcement pattern PT in the curved area CA. can reduce the probability of occurrence.

Specifically, as shown in FIG. 16B , the reinforcement pattern PT is less affected by stretching stress in the curved area CA, and thus, the reinforcement pattern PT can more effectively withstand the stress in the curved area CA. Accordingly, the elongation of the stretchable display device according to another embodiment of the present invention may be improved.

In addition, in the stretchable display device according to another exemplary embodiment of the present invention, since the diameter of the reinforcement pattern PT is wider than the width of the wiring, the resistance of the connection wiring 1520 may be reduced. Signal propagation delay can also be reduced.

A stretchable display device according to various embodiments of the present disclosure may be described as follows.

A stretchable display device according to an exemplary embodiment includes a plurality of first substrates disposed to be spaced apart from each other on a lower substrate and on which at least one pixel is formed, and a plurality of first substrates adjacent to each other among the plurality of first substrates. a plurality of connecting portions connecting the substrates; and a plurality of connection wires electrically connecting pads disposed on a plurality of first substrates adjacent to each other and disposed on side surfaces of the plurality of connection parts, thereby minimizing resistance of the connection wires.

According to another feature of the present invention, each of the plurality of connection wires may be disposed on both sides of each of the plurality of connection parts, and may be in the form of double wires connected in parallel.

According to another feature of the present invention, each of the plurality of connection parts and the plurality of connection wires has a curved shape, and a straight region in which the plurality of connection parts and the plurality of connection wires extend in a straight line, and a plurality of connection parts and a plurality of connection wires It may include a curved region that is curved.

According to another feature of the present invention, in the straight region and the curved region, the plurality of connection wires may be disposed only on side surfaces of the plurality of connection portions.

According to another feature of the present invention, each of the plurality of connection wires may have a thickness of 0.6 μm to 1 μm.

According to another feature of the present invention, the plurality of connection wires may be disposed only on side surfaces of the plurality of connection parts in the curved region, and the plurality of connection wires may be disposed only on the upper surface of the plurality of connection parts in the straight region.

According to another feature of the present invention, the thickness of each of the plurality of connection wires disposed in the curved area may be thinner than the thickness of each of the plurality of connection wires disposed in the straight area.

According to another feature of the present invention, in the curved region and the straight region, the plurality of connection wires may be disposed on both the upper surface and the side surface of the plurality of connection parts.

According to another feature of the present invention, each of the plurality of connection wires includes an upper connection wire disposed on an upper surface of the plurality of connection parts and a lower connection wire disposed on side surfaces of the plurality of connection parts, and the thickness of the lower connection wire is the upper connection part. It may be thinner than the thickness of the wiring.

According to another feature of the present invention, in the curved region, the plurality of connection wires may be disposed on side surfaces of the plurality of connection parts, and in the straight region, the plurality of connection wires may be disposed on both upper surfaces and side surfaces of the plurality of connection parts.

According to another feature of the present invention, the thickness of the plurality of first connecting portions disposed in the straight region may be greater than the thickness of the plurality of second connecting portions disposed in the curved region.

According to another feature of the present invention, the thickness of the plurality of connection wires disposed in the straight region may be the same as the thickness of the plurality of connection wires disposed in the curved region.

According to another feature of the present invention, the plurality of connection wirings disposed in the curved area may include a reinforcement pattern.

According to another feature of the present invention, the diameter of the reinforcement pattern may be wider than the width of the plurality of connection wires disposed in the straight region.

Although 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 various modifications may be made within the scope without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the technical spirit 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 by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: stretchable display device
112: buffer layer
113: gate insulating layer
114: interlayer insulating layer
115: planarization layer
120, 420, 620, 820, 1020, 1220, 1520: connecting wiring
121: first connection wiring
122: second connection wiring
130: pad
131: first pad
132: second pad
140: COF
141: base film
142: driving IC
150: transistor
151: gate electrode
152: active layer
153: source electrode
154: drain electrode
160: LED
161: n-type layer
162: active layer
163: p-type layer
164: n low pole
165: p electrode
191, 192: connection pad
DS: lower board
ST1: first substrate
ST2: second substrate
CS: connection
CS1: first connection
CS2: second connection
PT: reinforcement pattern
US: top board
AA: display area
NA: non-display area
GD: gate driver
PCB: Printed Circuit Board
PX: Pixel
SPX: sub-pixel
CL: common wiring
AD: adhesive layer
CA: curved area
SA: straight area
820D, 1020D: bottom connection wiring
820U, 1020U: top connection wiring

Claims (15)

a plurality of first substrates spaced apart from each other on a lower substrate and on which at least one pixel is formed;
a plurality of connecting portions connecting a plurality of first substrates adjacent to each other among the plurality of first substrates; and
and a plurality of connection wires electrically connecting pads disposed on the plurality of first substrates adjacent to each other and disposed on side surfaces of the plurality of connection parts.
According to claim 1,
Each of the plurality of connecting wires,
The stretchable display device is disposed on both sides of each of the plurality of connection parts and has a double wire type connected in parallel.
According to claim 1,
Each of the plurality of connection parts and the plurality of connection wires has a curved shape,
and a straight region in which the plurality of connection parts and the plurality of connection wires extend in a straight line, and a curved region in which the plurality of connection parts and the plurality of connection wires are bent.
4. The method of claim 3,
In the linear region and the curved region,
The plurality of connection wires are disposed only on side surfaces of the plurality of connection parts.
5. The method of claim 4,
A thickness of each of the plurality of connection lines is 0.6 μm to 1 μm.
4. The method of claim 3,
In the curved area,
The plurality of connection wires are disposed only on side surfaces of the plurality of connection parts,
In the linear region,
The plurality of connection wires are disposed only on upper surfaces of the plurality of connection parts.
7. The method of claim 6,
than the thickness of each of the plurality of connecting wires disposed in the straight region
The stretchable display device, wherein each of the plurality of connection lines disposed in the curved region has a thinner thickness.
4. The method of claim 3,
In the curved region and the straight region,
The plurality of connection wires are disposed on both upper surfaces and side surfaces of the plurality of connection parts.
7. The method of claim 6,
Each of the plurality of connecting wires,
an upper connection wire disposed on an upper surface of the plurality of connection parts and a lower connection wire disposed on side surfaces of the plurality of connection parts;
and a thickness of the lower connection line is thinner than a thickness of the upper connection line.
4. The method of claim 3,
In the curved area,
The plurality of connection wires are disposed on side surfaces of the plurality of connection parts,
In the linear region,
The plurality of connection wires are disposed on both upper surfaces and side surfaces of the plurality of connection parts.
a plurality of first substrates spaced apart from each other on a lower substrate and on which at least one pixel is formed;
a plurality of connecting portions connecting a plurality of first substrates adjacent to each other among the plurality of first substrates; and
and a plurality of connection wires electrically connecting the pads disposed on the plurality of first substrates adjacent to each other, and
and a straight region in which the plurality of connection parts and the plurality of connection wires extend in a straight line and a curved region in which the plurality of connection parts and the plurality of connection wires are bent are defined.
12. The method of claim 11,
The stretchable display device, wherein a thickness of the plurality of first connecting portions disposed in the straight region is greater than a thickness of the plurality of second connecting portions disposed in the curved region.
13. The method of claim 12,
The stretchable display device, wherein a thickness of the plurality of connection wires disposed in the straight region is the same as a thickness of the plurality of connection wires disposed in the curved region.
12. The method of claim 11,
The plurality of connection lines disposed in the curved area include a reinforcement pattern.
15. The method of claim 14,
The reinforcement pattern is in the form of a circle,
and a diameter of the reinforcement pattern is wider than a width of a plurality of connection wires disposed in the straight region.

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