KR101385458B1 - Display device and Manufacturing method thereof - Google Patents

Abstract

The present invention relates to a display device which simplifies the manufacturing process of a plurality of display units included in one display device and a method of manufacturing the same.

A method of manufacturing a display device according to the present invention includes forming two or more display parts on one surface of a flexible substrate in a form of being separated from each other; And forming a bending groove penetrating the flexible substrate at a boundary between the display units. The thin film transistors included in each of the display units are formed at the same time.

Description

Display device and manufacturing method thereof

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a folding type cellular phone which is an example of a display device having a plurality of display units in the related art.

FIG. 2 illustrates a method of manufacturing the display device illustrated in FIG. 1.

3 is a flowchart illustrating a method of manufacturing a display device according to an exemplary embodiment of the present invention.

4 is a view for explaining a step of forming a bending groove at a boundary between the display units;

5A to 5C illustrate display parts of a display device according to an exemplary embodiment of the present invention.

6A to 6C are diagrams for describing a method of manufacturing a display device according to an exemplary embodiment of the present invention in more detail.

FIG. 7 is a diagram for describing a method of forming a display unit when the display units are different kinds; FIG.

8 to 11B are views for explaining various methods of folding a flexible substrate.

<Explanation of symbols for the main parts of the drawings>

131: flexible substrate

A1, A2, A3: Areas separated by the boundary of the display section

130, 130a, 130b: thin film transistor array

140, 140a, 140b, 240, 340: upper array

73, 83: hinge 71a, 71b, 81a, 81b: body

75: input unit 311: bending groove

The present invention relates to a display device and a method of manufacturing the same. In particular, the present invention relates to a display device and a method of manufacturing the same, which simplify the manufacturing process of a plurality of display units included in one display device.

The display device is being developed based on a flat panel display device that can realize a thin screen and a large screen. Such flat panel displays include liquid crystal displays (hereinafter referred to as "LCDs"), organic light emitting diodes (hereinafter referred to as "OLEDs"), electrophoretic displays (Electrophoresis Display; Hereinafter referred to as " EPD "). They are driven by thin film transistors (hereinafter referred to as "TFTs").

In addition, although a display device generally implements an image through a single display unit, development and use of display apparatuses for implementing an image through a plurality of display units are being activated due to the development of mobile devices such as mobile phones and laptops.

1 illustrates a foldable cellular phone as a representative example of a display device having a plurality of display units.

Referring to FIG. 1, a folding cellular phone includes a display unit 1 and an input unit 5. The display portion 1 and the input portion 5 are assembled in the body portion 9 of the terminal device including a rotatable hinge 7. As a result, the display unit 1 and the input unit 5 are folded in conjunction with the opening and closing operation of the body 9. The display portion 1 of such a display device includes a first display portion 2 and a second display portion 3 facing in both directions for the convenience of using a mobile phone. The first display portion 2 is formed for displaying an image when the body portion 9 is folded, and the second display portion 3 is formed for displaying an image when the body portion 9 is unfolded. The second display unit 3 is a main display unit that can identify images such as numbers input to the input unit 5, and the first display unit 2 is an auxiliary display unit such as a date, time, a received message, and the like. Simple information irrelevant to the input of the body can be checked even when the body (9) is folded.

Thus, the display part 1 provided with the 1st and 2nd display parts 2 and 3 is manufactured through the manufacturing process as shown in FIG.

Referring to FIG. 2, a manufacturing process of the display unit 1 including the first and second display units 2 and 3 may include forming the first display unit 2 and the second display unit 3, and the first display unit 2. ) And the second display unit 3 are aligned, and the first display unit 2 and the second display unit 3 are bonded to each other.

The process of forming the first display unit 2 and the second display unit 3 includes forming the first display element included in the first display unit 2 on the first glass substrate 10 and the second display unit 3. ) Is formed into a process of forming a second display element included on the second glass substrate 20. In addition, the first display element and the second display element include a TFT array. Accordingly, the process of forming the first display element on the first glass substrate 10 includes forming a TFT array on the first glass substrate 10, and the second display element is formed on the second glass substrate 20. The process of forming on the substrate includes forming a TFT array on the second glass substrate 20. On each of the glass substrates 10 and 20 on which the TFT array is formed, the first display portion 2 and the second display portion 3 are completed through a subsequent process, respectively.

The process of aligning the first display unit 2 and the second display unit 3 is a process of aligning the first display unit 2 and the second display unit 3 so as to face in both directions depending on the use of the display device.

The step of joining the first display portion 2 and the second display portion 3 is a step of bonding the surfaces of the aligned first display portion 2 and the second display portion 3 to each other with a real material 25 or the like.

As described above, the manufacturing process of the display unit 1 including the first and second display units 2 and 3 is formed by forming the first display unit 2 and the second display unit 3 and then bonding them. In addition, the steps of forming the first display unit 2 and the second display unit 3 respectively include forming a TFT array on the first glass substrate 10 and forming a TFT array on the second glass substrate 20. Process. The process of forming the TFT array includes a plurality of mask processes. One mask process includes a plurality of processes such as a thin film deposition (coating) process, a cleaning process, a photolithography process (hereinafter, a photo process), an etching process, a photoresist removing process, an inspection process, and the like. As a result, the manufacturing process of the display unit 1 including the first and second display units 2 and 3 is very complicated because it includes two groups of mask processes. Accordingly, in order to manufacture the display unit 1 including the first and second display units 2 and 3, a large material cost, a manufacturing cost, and a manufacturing time are required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device and a method of manufacturing the same that simplify the manufacturing process of a plurality of display units included in one display device.

In order to achieve the above object, a method of manufacturing a display device according to an embodiment of the present invention comprises the steps of forming at least two display units on one surface of the flexible substrate to be separated from each other; And forming a bending groove penetrating the flexible substrate at a boundary between the display units. The thin film transistors included in each of the display units are formed at the same time.

A display device according to an embodiment of the present invention is a flexible substrate; And at least two display units formed on one surface of the flexible substrate; The flexible substrate is folded along the bending grooves formed through the flexible substrate at the boundary between the display units.

The flexible substrate includes a metal substrate of 0.2 mm or less.

The flexible substrate includes a plastic substrate of 0.5 mm or less.

The display portion includes first and second display portions; The first and second display units are disposed with the flexible substrate folded along the bending grooves therebetween.

The folded faces of the flexible substrate are bonded.

The bonded flexible substrate is assembled in a first body part including a hinge, the hinge is coupled to a second body part in which an input part is assembled, and the display part and the input part are joined to the hinge by the first and second bodies. Fold in conjunction with negative rotation.

At least one display unit is formed on a portion of one surface of the substrate separated by the boundary.

The flexible substrate is assembled to a body portion including a hinge, and the flexible substrate is folded along the bending groove in conjunction with the rotation of the body portion coupled to the hinge.

The display portion includes first and second display portions; The first and second display portions face each other in a space of the flexible substrate folded along the bending grooves.

The display portion includes first to third display portions; The first and second display portions face each other in a space of the flexible substrate folded along the bending grooves; The second and third display units face each other with the flexible substrate folded along the bending grooves therebetween.

Each of the display units includes any one of a liquid crystal display (LCD), an organic light emitting display (OLED), and an electrophoretic display (EPD).

Other objects and advantages of the present invention will become apparent from the following description of preferred embodiments of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 11.

3 is a flowchart illustrating a manufacturing method of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a method of manufacturing a display device according to an exemplary embodiment of the present invention may include forming two or more display parts, that is, a plurality of display parts on a flexible substrate (hereinafter, referred to as “S1”) and at the boundary of display parts. Forming a bending groove (hereinafter referred to as " S3 ").

Display units according to embodiments of the present invention include a TFT array. In S1, the TFT array included in each of the display portions is formed simultaneously through a group of masks. S1 includes forming a TFT array included in each of the display portions at the same time, and then forming an upper array portion of the display portions on the TFT array. The display unit is formed on the flexible substrate in consideration of the folding of the substrate. The flexible substrate is made of thin plastic or thin metal which is durable. If the thickness of the plastic is less than 0.5mm can be folded without damaging the flexible substrate, if the thickness of the metal is less than 0.2mm can be folded without damaging the flexible substrate.

In S3, bending grooves 311 penetrating through the flexible substrate 131 are formed at the boundary between the display units as shown in FIG. 4. The bending groove 311 is formed to have a size of 200 μm or less at the boundary of the display units, so that the flexible substrate 131 can be easily folded at the boundary of the display units. Since the flexible substrate 131 is thin, the bending groove 311 is formed by cutting the flexible substrate 131 by a physical method such as a knife. In particular, when the flexible substrate 131 is a metal substrate, the bending groove 311 may be formed by irradiating a laser on the flexible substrate 131.

After the bending grooves 311 are formed, the flexible substrate may be folded along the bending grooves 311 in various ways. For example, the flexible substrate is folded in a state in which a display unit is formed, or is assembled in a body part of a terminal device including a hinge that is rotatable and folded in conjunction with an opening and closing operation of the terminal device.

5A to 5C illustrate examples of a display unit included in a display device according to an exemplary embodiment of the present invention. 5A to 5C, a display unit of a display device according to an exemplary embodiment of the present invention includes an LCD, an EPD, an OLED, and the like. The above-mentioned display elements are all driven by including a TFT array.

The LCD is divided into a TFT array portion and an upper array portion facing each other with the liquid crystal molecules 71 interposed therebetween as shown in FIG. 5A.

The upper array 140 of the LCD includes a black matrix 143, a color filter 145, and a common electrode 147 formed on the upper substrate 141. The black matrix 143 partitions an area where the color filter 145 is to be formed and absorbs light incident from the adjacent color filter 145 to prevent optical interference between adjacent color filters 145. The color filter 145 transmits light of a specific wavelength band including red (R), green (G), and blue (B) to display a corresponding color. The common electrode 147 forms an electric field with the pixel electrode 47 of the TFT array portion.

The TFT array 130 includes TFTs connected to a gate line (not shown) and a data line (not shown) intersecting each other with a gate insulating film 133 formed on the flexible substrate 131 interposed therebetween. The pixel electrode 47 is included. The TFT array 130 includes an insulating film 132 for planarizing the surface of the flexible substrate 131 and insulating the flexible substrate 131 between the flexible substrate 131 and the gate conductive layer including the gate electrode 38. Is formed more.

The TFT causes the data signal of the data line to be charged and held in the pixel electrode 47 in response to the gate signal of the gate line. To this end, the TFT includes a gate electrode 38 extending from the gate line, a semiconductor pattern 48 overlapping the gate electrode 38, a source electrode 40 ohmic contact with the semiconductor pattern 48 and extending from the data line, And a drain electrode 42 in ohmic contact with the semiconductor pattern 48 and connected to the pixel electrode 47. The semiconductor pattern 48 is exposed between the source electrode 40 and the drain electrode 42 to form an active channel 44, and the electrodes 40 and 42 connected to the active layer 44 include the active layer 44. ) And an ohmic contact layer 46 to make ohmic contact. The pixel electrode 47 is in contact with the drain electrode 42 through the contact hole 45 exposing the drain electrode 42 through the passivation layer 135 that protects the TFT.

The LCD may implement a predetermined gray color by adjusting the light transmittance passing through the liquid crystal molecules 71 by using an electric field formed between the pixel electrode 47 and the common electrode 47. When the LCD included in the display unit is a reflective type for displaying an image using light incident from the outside, the pixel electrode 47 is made of aluminum-based metal having high reflectance to reflect light incident from the outside. . In addition, in order to increase reflection efficiency of the pixel electrode 47, the passivation layer 135 under the pixel electrode 47 may have an embossed surface such that the pixel electrode 47 has an embossed surface.

When the LCD is a transmission type or a transflective type for displaying an image using light incident through the backlight, the flexible substrate 131 is preferably a plastic substrate. The backlight may be assembled to the rear surface of the flexible substrate 131 at the time of assembling the body.

The EPD is divided into a TFT array portion and an upper array portion as shown in Fig. 5B.

The upper array 240 of the EPD includes an upper electrode 244 formed on the upper substrate 241, capsules 245 positioned on the upper electrode 244 and including charge pigment particles, and an adhesive layer. (adhesive layer) 246. The capsule 245 includes black dye particles 245a and white dye particles 245b charged at different polarities, and a transparent fluid 245c.

The TFT array 130 includes TFT and pixel electrodes 47 formed on the flexible substrate 131 as described above in FIG. 5A.

The EPD is divided into black, white, or a predetermined gray color by dividing the white dye particles 245b and the black dye particles 245a in the capsule 245 by an electric field formed between the pixel electrode 47 and the upper electrode 244. Can be implemented.

The OLED is divided into a TFT array portion and an upper array portion as shown in Fig. 5C.

The upper array 340 of the OLED includes a first electrode 342, an organic emission layer 346, and a second electrode 347 formed on the upper substrate 341. The first electrode 342 is formed on the entire surface of the upper substrate 341, and the second electrode 347 is formed in sub pixel units. The organic emission layer 346 includes a first carrier transport layer 343 in contact with the first electrode 342, a second carrier transport layer 345 in contact with the second electrode 347, and a first carrier transport layer 343. And a light emitting layer 344 formed between the second carrier transport layer 345. The light emitting layer 344 is patterned in subpixel units and includes a light emitting layer of red (R), green (G), and blue (B). When the first electrode 342 is an anode and the second electrode 347 is a cathode, the first carrier transport layer 343 includes a hole injection layer and a hole transport layer, and the second carrier transport layer 345 is an electron transport layer. And an electron injection layer. The upper array 340 further includes a connection pattern 349 connected to the second electrode 347. The connection pattern 349 is also connected to the pixel electrode 47 included in the TFT array 130. Accordingly, the second electrode 347 may receive a signal from the TFT.

The TFT array 130 includes a TFT and a pixel electrode 47 formed on the flexible substrate 131 as described above in FIG. 5A. The pixel electrode 47 connected to the TFT is connected to the connection pattern 349.

The OLED displays an image by causing the light emitting layer 344 to emit light by an electric field formed between the first electrode 342 and the second electrode 347. That is, when voltage is applied, holes generated from the first electrode 342, which is an anode, move toward the emission layer 344 through the hole injection layer and the hole transport layer 343. In addition, electrons generated from the second electrode 347, which is a cathode, move toward the emission layer 344 through the electron injection layer and the electron transport layer 345. Accordingly, in the light emitting layer 344, light is generated as holes and electrons collide and recombine, and the light is emitted to the outside through the first electrode 342, which is a transparent electrode, so that an image is displayed.

6A to 6C are diagrams for describing a method of manufacturing a display device according to an exemplary embodiment of the present invention in more detail. 6A to 6C, a case in which the display units are made of LCD will be described as an example.

Referring to FIG. 6A, the flexible substrate 131 is divided into a first region A1 and a second region A2 with the boundary of the display units interposed therebetween. The first TFT array 130a is formed in the first region A1 through the TFT array forming process, and the second TFT array 130b is formed in the second region A2 through the TFT array forming process. The first TFT array 130a and the second TFT array 130b include a gate line GL, a data line DL, a gate line GL, and a TFT connected to the data line DL, and a pixel connected to the TFT. Electrode 47. The first TFT array 130a and the second TFT array 130b including the same components are simultaneously formed through a group of mask processes.

Referring to FIG. 6B, after the first and second TFT arrays 130a and 130b are formed on the flexible substrate 131, a subsequent process of completing the display unit is performed. In detail, the first upper substrate 141a having the first upper array 140a formed thereon is bonded to the first region A1 to face the first TFT array 130a. The second upper substrate 141b on which the second upper array 140b is formed to face the second TFT array 130b is bonded to the second region A2 of the flexible substrate 131. The liquid crystals 71a and 71b are formed with the flexible substrate 131 having the first and second TFT arrays 130a and 130b formed thereon or the first and second upper arrays 140a and 140b before bonding the upper substrates 141a and 141b. The first and second upper substrates 141a and 141b may be dropped. Alternatively, the liquid crystals 71a and 71b may be injected into the space between the upper substrates 141a and 141b and the flexible substrate 131 after the upper substrates 141a and 141b are bonded. In addition, the liquid crystals 71a and 71b may be formed in various ways.

As another example, when the display unit to be formed is an EPD, the upper array unit of the EPD prepared in advance is bonded onto the flexible substrate on which the TFT array is formed through a subsequent process for completing the display unit. As another example, when the display unit to be formed is an OLED, the upper array unit of the OLED is bonded onto the flexible substrate on which the TFT array is formed through a subsequent process for completing the display unit.

Next, as described above with reference to FIG. 4, a bending groove is formed at the boundary between the first display unit and the second display unit.

Referring to FIG. 6C, after the first display unit and the second display unit are completed, the flexible substrate 131 is folded along the bending groove. The method of folding the flexible substrate 131 may vary depending on the arrangement of the display units.

6A to 6C illustrate the case in which the display units are made of LCD only, but different types of display units may be formed in each display unit depending on which upper array unit is bonded to the process of completing the display unit. As described above, even when the display units formed on the display units are different, the process of forming the first and second TFT arrays 130a and 130b is simultaneously performed through a group of mask processes. The process proceeds according to the type of display elements constituting the display unit.

For example, when the LCD is formed in the first area A1 and the EPD is formed in the second area A2 as shown in FIG. 7, the TFT array forming process is simultaneously performed as described above with reference to FIG. 5A. . In the flexible substrate 131 on which the first and second TFT arrays 130a and 130b are formed, the first display unit and the second display unit are completed through a process of completing the display unit. That is, a first upper array 140 is formed to face the first TFT array 130a in the first area A1 of the flexible substrate 131 on which the first and second TFT arrays 130a and 130b are formed. The upper substrate 141 is bonded. The liquid crystal 71 may be dropped onto the flexible substrate 131 on which the first TFT array 130a is formed or the first upper substrate 141 on which the first upper array 140 is formed before bonding the first upper substrate 141. . Alternatively, the liquid crystal 71 may be injected into the space between the first upper substrate 141 and the flexible substrate 131 after bonding the first upper substrate 141. In addition, the liquid crystal 71 may be formed in various ways. Apart from the completion of the first display unit, the second upper substrate 242 having the second upper array unit 240 formed thereon is bonded to the second region of the flexible substrate 131 so as to face the second TFT array 130b. Here, the first upper array unit 140 includes the color filter described above in FIG. 3A, and the second upper array unit 240 includes a capsule including the charged dye particles described above in FIG. 3B.

8 to 11B are diagrams for describing various methods of folding the flexible substrate 131. As described above with reference to FIG. 6C, the method of folding the flexible substrate 131 may vary depending on the use of the display device.

As illustrated in FIG. 8, when the image is to be displayed through both surfaces of the display unit 175, the first display unit and the second display unit are disposed with the flexible substrate 131 folded in between. In this case, when the first display unit and the second display unit need to be fixed as in the case of a folding cellular phone, the present invention includes folding the flexible substrate 131 along the bending groove, and the flexible substrate 131 is folded to face each other. Bonding the faces to the actual or the adhesive 170 further comprises. The display unit 175 including the flexible substrate 131 bonded in this manner is assembled in the first body portion 71a to expose the first display unit and the second display unit. The first body portion 71a is coupled to the second body portion 71b through the rotatable hinge 73. In the second body portion 71b, an input portion 75 for inputting characters or numbers to be displayed on the display portion 175 is assembled.

The flexible substrate 131 is assembled into the body portions 81a and 81b including the hinge 83 as shown in FIG. 9, and then interlocked by the rotation of the body portions 81a and 81b coupled to the hinge 83. Can be folded. The body parts 81a and 81b may include two or more body parts depending on boundaries between the display parts. 9 illustrates a case in which the first and second body parts 81a and 81b are included, and the flexible substrate (a) is formed along the rotational direction of the hinge 83 for assembling the first and second body parts 81a and 81b. 131 is folded. For example, if the hinge 83 is rotated to face the first and second display portions, the flexible substrate 131 will be folded between the first and second display portions. On the other hand, if the hinge 83 is rotated such that the first and second display portions face each other, the flexible substrate 131 is folded so that the first and second display portions face each other in the space by the flexible substrate 131. .

In addition, in the present invention, three or more display units may be formed. 10A through 11B illustrate a display device including three display units as an example. One display part may be formed on one surface of the flexible substrate 131 with the boundary of the display parts interposed therebetween, as shown in FIGS. 10A and 10B, or two or more display parts may be formed as illustrated in FIGS. 11A and 11B. Can be. Hereinafter, various methods of folding the flexible substrate 131 will be described without omitting the body part.

Referring to FIG. 10A, the flexible substrate 131 is divided into three regions A1, A2, and A3 according to the boundary of the display units. In each of the first to third regions A1, A2, and A3, display units (first display unit, second display unit, and third display unit) are formed. As described above with reference to FIGS. 6A to 7, all of the first to third display units include TFT arrays, and each display unit includes display elements of the same or different type. The flexible substrate 131 having the first to third display parts is folded as shown in FIG. 10B along a bending groove of the boundary of the display parts. Referring to FIG. 10B, the first and second display portions face each other in the space of the flexible substrate 131 folded in cross section, and the second and third display portions face the flexible substrate 131 folded in cross section. Leave on and face each other. As shown in FIG. 10B, the display device that is folded does not expose the display surfaces of the first to third display units to the outside when the first to third display units are not used, thereby protecting the display surfaces of the first to third display units. Can be.

Referring to FIG. 11A, the flexible substrate 131 is divided into two regions A1 and A2 according to the boundary of the display portions, and each of the regions A1 and A2 has display portions (first display portion, second display portion, and third portion). Display unit) is formed. In this case, one or more display units may be formed in each of the regions A1 and A2. In FIG. 11A, the first display part is formed in the first area A1, and the second and third display parts are formed in the second area A2.

As described above with reference to FIGS. 6A to 7, all of the first to third display units include TFT arrays, and each display unit includes display elements of the same or different type. The flexible substrate 131 on which the first to third display parts are formed is folded as shown in FIG. 11B at the boundary of the display parts. Referring to FIG. 11B, the first display portion and the second display portion are disposed with the flexible substrate 131 folded in the cross section, and the third display portion faces in a direction parallel to the second display portion. As shown in FIG. 11B, the folded display device is applied to a folding type mobile phone such that the first display unit and the second display unit display a simple image such as a date and time, and the third display unit displays a character inputted from the outside. It can be applied in various ways.

As described above, the method of manufacturing the display device according to the exemplary embodiment of the present invention includes forming a plurality of display units on one surface of the flexible substrate, and forming the bending grooves at the boundaries of the display units. As a result, in the display device according to the exemplary embodiment of the present invention, a plurality of display units are disposed along the same surface.

Although the structure of the TFT array according to the embodiment of the present invention described above is mainly focused on using amorphous silicon as the semiconductor layer, the embodiment of the present invention is not limited to the amorphous silicon type TFT array, but the poly It can also be applied to a (Poly) type TFT array.

As described above, the present invention forms a plurality of display portions on one surface of the flexible substrate, and then forms a bending groove at each boundary of the display portions, thereby easily folding the flexible substrate along the bending groove. Since a plurality of display units are formed on the same side of the flexible substrate, TFT arrays included in each display unit are simultaneously manufactured through a group of mask processes. As a result, the present invention can simplify the manufacturing process of the display device having a plurality of display units, and also reduce the process time and manufacturing cost.

In addition, since the TFT driving elements included in each display unit according to the present invention are manufactured through the same mask process on one substrate, it is easy to align adjacent wirings so that linkage driving between display units is possible. Accordingly, the present invention can easily achieve the cooperative driving between display units adjacent to each other only by changing the circuit connected to the wirings.

In addition, since the present invention forms the display parts on the flexible substrate, the flexible substrate can be folded in various ways at each boundary of the display parts, thereby providing a wide range of applications.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (23)

Simultaneously forming at least first and second display portions spaced apart from each other on one surface of the flexible substrate; Forming a bending groove at a boundary between the first and second display units of the flexible substrate; And Assembling the flexible substrate, which is folded using the bending groove, to the body portion such that the first and second display portions face each other; And forming the bending grooves, wherein the bending grooves are formed in a shape in which grooves penetrating the flexible substrate are arranged along a boundary between the first and second display units. The method of claim 1, The flexible substrate includes a metal substrate of 0.2 mm or less. The method of claim 1, The flexible substrate may include a plastic substrate of 0.5 mm or less. delete delete delete The method of claim 1, In the assembling the flexible substrate to the body portion, the body portion includes a first body portion including a hinge, and a second body portion assembled with the input unit, Assembling the flexible substrate in the body portion, Folding the flexible substrate using the bending groove; Bonding mutually opposing surfaces of the folded flexible substrate; Assembling the flexible substrate having the surfaces facing each other into the first body portion; And Fastening the second body portion to a hinge of the first body portion, In the folding of the flexible substrate, the mutually facing surfaces of the folded flexible substrate are disposed between the first and second display portions that face each other, In the step of fastening the second body portion to the hinge of the first body portion, any one of the first and second display portion and the input unit is interlocked with the hinge between the first and second body portion to face each other. Method of manufacturing a display device. delete The method of claim 1, In the assembling the flexible substrate to the body portion, the body portion includes a hinge, Assembling the flexible substrate in the body portion, The bending groove is disposed to correspond to the hinge, the flexible substrate is folded along the bending groove in conjunction with the hinge, And the first and second display units face each other between the folded and folded flexible substrates in conjunction with the hinges. delete 10. The method of claim 9, In the step of forming the first and second display unit at the same time, further forming a third display unit spaced apart from the first and second display unit on one surface of the flexible substrate, In the assembling of the flexible substrate to the body portion, the flexible substrate is folded using a bending groove between any one of the first and second display portion and the third display portion, The folded flexible substrate is disposed between any one of the first and second display units and the third display unit. The method of claim 1, Each of the display units includes any one of a liquid crystal display (LCD), an organic light emitting display (OLED), and an electrophoretic display (EPD). A flexible substrate; First and second display parts spaced apart from each other on one surface of the flexible substrate; A bending groove formed at a boundary between the first and second display portions of the flexible substrate; And A body portion assembled with the flexible substrate folded using the bending groove so that the first and second display portions face each other; And the banding groove is formed in a shape in which grooves penetrating the flexible substrate are arranged along a boundary between the first and second display units. 14. The method of claim 13, The flexible substrate may include a metal substrate of 0.2 mm or less. 14. The method of claim 13, The flexible substrate may include a plastic substrate of 0.5 mm or less. delete delete 14. The method of claim 13, The body portion includes a first body portion including a hinge, and a second body portion assembled with the input, The flexible substrate folded using the bending groove includes surfaces disposed between the first and second display portions and facing each other. Mutually opposing faces of the folded flexible substrate are bonded, The flexible substrate on which the surfaces facing each other are bonded is assembled in the first body portion. The hinge is engaged with the second body portion, And one of the first and second display units and the input unit interlock with a hinge between the first and second body portions so as to face each other. delete 14. The method of claim 13, The body portion includes a hinge, In the state where the bending grooves are aligned to correspond to the hinge, the flexible substrate is assembled in the body portion, The flexible substrate is folded along the bending groove in conjunction with the hinge, And the first and second display units face each other between the folded and folded flexible substrates in association with the hinges. delete 21. The method of claim 20, And a third display unit spaced apart from the first and second display units on one surface of the flexible substrate. The flexible substrate is folded using a bending groove between any one of the first and second display units and the third display unit. And the folded flexible substrate is disposed between any one of the first and second display units and the third display unit. 14. The method of claim 13, Each of the display units includes any one of a liquid crystal display (LCD), an organic light emitting display (OLED), and an electrophoretic display (EPD).

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