Display device

Abstract

A display device is provided. The display device includes a flexible substrate, a display, pads, and a plurality of wirings. The flexible substrate includes a first region where an image is displayed, a second region separated from the first region, and a bending region located between the first region and the second region. The display is located on the first region of the flexible substrate, the pads are located on the second region of the flexible substrate, and the plurality of wirings are located on the flexible substrate. The plurality of wirings include a first wiring having a first shape and a second wiring having a second shape different from the first shape. The first wiring and the second wiring pass through the bending region.

Description

[0001] Korean Patent Application No. 10-2018-0120605, filed with the Korean Intellectual Property Office on October 10, 2018, and titled "Display Apparatus," is incorporated herein by reference in its entirety. Technical Field

[0002] Embodiments relate to a display apparatus. Background Art

[0003] A display apparatus may have a display on a substrate. In the display apparatus, by bending at least a part of the display apparatus, visibility at various angles may be improved, or the area of a non-display region may be reduced. Summary of the Invention

[0004] Embodiments may be implemented by providing a display apparatus including a flexible substrate including: a first region in which an image is displayed; a second region separated from the first region; and a bending region located between the first region and the second region; a display located on the first region of the flexible substrate; a pad located on the second region of the flexible substrate; and a plurality of wirings located on the flexible substrate, each of the plurality of wirings including: a first wiring having a first shape; and a second wiring having a second shape different from the first shape, the first wiring and the second wiring passing through the bending region.

[0005] The bending region may include: a first bending region contacting the first region and having a first curvature; and a second bending region contacting the first bending region and having a second curvature different from the first curvature.

[0006] The first curvature may be greater than the second curvature.

[0007] The first wiring may be located on the first bending region, and the second wiring may be located on the second bending region.

[0008] Each of the plurality of wirings may branch and include a first branch wiring and a second branch wiring located on the bending region.

[0009] The first branch wiring may include a first wire located on the first bending region and a second wire located on the second bending region, and the second branch wiring may include a third wire located on the first bending region and a fourth wire located on the second bending region.

[0010] Each of the first wire and the third wire of the first wiring may have a stripe shape.

[0011] The second wiring may further include a bridge wire connecting the second wire to the fourth wire.

[0012] The bridge line can be arranged in a direction intersecting the second wire and the fourth wire.

[0013] The first wiring can be inclined at an angle with respect to the second wiring.

[0014] The bending region can be bent along a bending axis extending in a first direction, and the second wiring can be arranged orthogonal to the bending axis.

[0015] The second wiring can further include a bridge line connecting the second wire and the fourth wire, and the bridge line can include a first bridge line and a second bridge line arranged in a direction intersecting each other.

[0016] Each of the second wire and the fourth wire can have a portion in contact with the bridge line, and the portion has an inwardly concave shape.

[0017] Each of the second wire and the fourth wire can have a portion in contact with the bridge line, and the portion has an outwardly rounded shape.

[0018] In a plane, the second wiring can include a hole surrounded by the second wire and the bridge line, or a hole surrounded by the fourth wire and the bridge line, and the hole has a fan shape.

[0019] The same signal can be input to each of the first branch wiring and the second branch wiring.

[0020] The first wiring can have a stripe shape.

[0021] The second wiring can have a plurality of holes.

[0022] The second wiring can have a curved shape in at least a part of its region.

[0023] The bending region can further include a third bending region in contact with the second bending region and having a third curvature different from the first curvature and the second curvature, and each of the plurality of wirings can include a third wiring in the third bending region and having a third shape different from the first shape and the second shape.

[0024] The first curvature, the second curvature, and the third curvature can satisfy the following equation: the first curvature > the second curvature > the third curvature.

[0025] The second curvature can be larger than the first curvature, and the second wiring can have a stripe shape.

[0026] The first wiring can include a plurality of holes.

[0027] The bending region can be symmetric about the bending axis, and the first bending region and the second bending region can be located on one side with respect to the bending axis.

[0028] Embodiments can be implemented by providing a display device including a substrate, the substrate including a curved region located between a first region and a second region and curved about a bending axis, the curved region including: a first curvature region curved with a first curvature; and a second curvature region located between the first curvature region and each of the first region and the second region and curved with a second curvature different from the first curvature; a display located in the first region of the substrate; and a plurality of wirings extending in a direction crossing the bending axis and passing through the curved region, each of the plurality of wirings having a first shape in the first curvature region and a second shape different from the first shape in the second curvature region.

[0029] The second curvature can be greater than the first curvature, and the second shape can be a stripe shape.

[0030] The first curvature can be greater than the second curvature, and the first shape can be a stripe shape.

[0031] Each of the plurality of wirings can branch and have a multi-wiring shape on the curved region.

[0032] Each of the plurality of wirings can further include bridge lines connecting the multi-wirings to each other in a region having a smaller curvature in the first curvature region and the second curvature region.

[0033] Each of the plurality of wirings can include a plurality of holes in a region having a smaller curvature in the first curvature region and the second curvature region.

[0034] Each of the plurality of wirings can have a curved shape in at least a part of each wiring in a region having a smaller curvature in the first curvature region and the second curvature region. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Features will be apparent to those skilled in the art by describing exemplary embodiments in detail with reference to the accompanying drawings, in which:

[0036] Figure 1 A perspective view showing a part of a display device according to an embodiment;

[0037] Figure 2 Shows Figure 1 A plan view of the display device before structural bending;

[0038] Figure 3 Shows Figure 1 An equivalent circuit diagram of any one pixel of the display device;

[0039] Figure 4 Shows Figure 1 A side view of the curved region of the display device;

[0040] Figure 5 Shows Figure 1 a plan view of a part of a bending region of a display device of

[0041] Figure 6 Shows Figure 5 a plan view of another embodiment of

[0042] Figure 7 Shows Figure 5 a plan view of another embodiment of

[0043] Figure 8 Shows Figure 5 a plan view of another embodiment of

[0044] Figure 9 a side view of a bending region of a display device according to another embodiment;

[0045] Figure 10 Shows Figure 9 a plan view of a part of a bending region of a display device of

[0046] Figure 11 a side view of a bending region of a display device according to another embodiment;

[0047] Figure 12 Shows Figure 11 a plan view of a part of a bending region of a display device of

[0048] Figure 13 a cross-sectional view of a display device according to another embodiment;

[0049] Figure 14 Shows Figure 13 a cross-sectional view of a display panel structure of ; and

[0050] Figure 15 and Figure 16 a plan view of a part of a display device according to another embodiment. DETAILED DESCRIPTION

[0051] Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the exemplary embodiments to those skilled in the art.

[0052] Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, in which like reference numerals always refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as limited to the descriptions set forth herein. Accordingly, the embodiments are described below only by referring to the accompanying drawings to explain aspects of the present specification. As used herein, the terms "or" and "and / or" include any combination and all combinations of one or more of the associated listed items. Expressions such as "at least one of / kind of..." modify the entire list of elements when placed after a list of elements and do not modify individual elements in the list.

[0053] It will be understood that although the terms "first", "second", etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. In addition, as used herein, unless the context clearly indicates otherwise, the singular forms "a / an", "said / the" are also intended to include the plural forms.

[0054] It will be understood that when a layer, region or component is referred to as being "formed on" another layer, region or component, it can be formed directly or indirectly on the said another layer, region or component. For example, there may be an intermediate layer, region or component.

[0055] For ease of explanation, the dimensions of the components in the drawings may be exaggerated. In other words, since the dimensions and thicknesses of the components in the drawings are arbitrarily shown for ease of explanation, the following embodiments are not limited thereto.

[0056] In the following examples, the x-axis, y-axis and z-axis are not limited to the three axes of a rectangular coordinate system and can be interpreted in a broader sense. For example, the x-axis, y-axis and z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other.

[0057] When a certain embodiment can be implemented differently, the specific process order may be performed differently from the described order. For example, two consecutively described processes may be performed substantially simultaneously or in an order opposite to the described order.

[0058] A display device according to an embodiment is a device for displaying an image and may include, for example, a liquid crystal display device, an electrophoretic display device, an organic light emitting display device, an inorganic light emitting display device, a field emission display device, a surface conduction electron emitter display device, a plasma display device or a cathode ray display device.

[0059] In the following description, for example, an organic light emitting display device is described as a display device according to an embodiment. However, various types of display devices may be employed.

[0060] Figure 1 A perspective view of a part of the display device 1 according to an embodiment is shown. Figure 2 Shown is Figure 1 a plan view of the display device 1 before the structure is bent.

[0061] Referring to Figure 1 and Figure 2 , the display device 1 according to the present embodiment may include a substrate 100. The substrate 100 may have a first region 1A, a second region 2A, and a bending region BA. The bending region BA may be between the first region 1A and the second region 2A. In an embodiment, as shown in Figure 1 , the substrate 100 may be bent about or around a bending axis BAX that extends in the X direction.

[0062] The substrate 100 may include various materials having a flexible or bendable property. For example, the substrate 100 may include a polymer resin such as polyethersulfone (PES), polyacrylate (PA), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallyl ester, polyimide (PI), polycarbonate (PC), or cellulose acetate propionate (CAP).

[0063] The display region DA may be included in the first region 1A. For example, as shown in Figure 2 , the first region 1A may include the display region DA and a part of the peripheral region PA around the display region DA. The peripheral region PA may include the bending region BA and the second region 2A. The first region 1A and the second region 2A and the bending region BA located between them may be on the same plane (x-y plane).

[0064] Referring to Figure 2 , the display device 1 may include a display 10 disposed on the substrate 100. The display 10 may include a plurality of pixels P connected to a scan line SL extending in the x direction and a data line DL extending in the y direction perpendicular to the x direction. The display 10 may provide an image by light emitted from the pixels P and define the display region DA.

[0065] Each pixel P may emit, for example, red light, green light, blue light, or white light. Each pixel P may include a display element that may include an organic light emitting diode (OLED). In an embodiment, the pixel P refers to a pixel that emits any one of the above red light, green light, blue light, and white light. The structure of the pixel P will be described in detail below with reference to Figure 3 .

[0066] The peripheral region PA can be outside the display region DA. For example, the peripheral region PA can surround the display region DA. The peripheral region PA is an area where no pixels P are arranged and corresponds to a non-display region that does not provide an image. In an embodiment, the bending region BA can be a part of the peripheral region PA, and thus, the bending region BA can be a non-display region that does not provide an image.

[0067] The driving circuits (e.g., the first scan driving circuit 20, the second scan driving circuit 30, the pad structure 40, the driving power supply wiring 60, and the common power supply wiring 70) can be arranged in the peripheral region PA.

[0068] The first scan driving circuit 20 and the second scan driving circuit 30 can be arranged in the peripheral region PA of the substrate 100, can generate scan signals, and can transmit the scan signals to each pixel P through the scan lines SL. In an embodiment, the first scan driving circuit 20 can be arranged on the left side of the display 10, and the second scan driving circuit 30 can be arranged on the right side of the display 10. In an embodiment, only one scan driving circuit can be provided.

[0069] The pad structure 40 can be arranged at one end of the substrate 100 and can include a plurality of pads 41, 42, 44, and 45. The pad structure 40 can be exposed without being covered by an insulating layer and can be electrically connected to a flexible printed circuit board substrate (FPCB). The pad structure 40 can be located on a side of the substrate 100 where the first scan driving circuit 20 and the second scan driving circuit 30 are not located.

[0070] The FPCB is electrically connected to the controller 90 and the pad structure 40, and the signals or power transmitted from the controller 90 can be transmitted to the connection wirings 21, 31, 51, 61, and 71 connected to the pad structure 40.

[0071] The controller 90 receives a vertical synchronization signal, a horizontal synchronization signal, and a clock signal, and generates control signals to control the driving of the first scan driving circuit 20 and the second scan driving circuit 30. The generated signals can be transmitted to each of the first scan driving circuit 20 and the second scan driving circuit 30 through the pads 44 and the connection wirings 21 and 31 connected to the FPCB. The scan signals of the first scan driving circuit 20 and the second scan driving circuit 30 can be provided to each pixel P through the scan lines SL. The controller 90 supplies the driving power ELVDD and the common power ELVSS to the driving power supply wiring 60 and the common power supply wiring 70 through the pads 42 and 45 and the connection wirings 61 and 71 connected to the FPCB, respectively. The driving power ELVDD can be provided to each pixel P through the driving voltage line PL, and the common power ELVSS can be provided to the common electrode of the pixel P.

[0072] The data driving circuit 80 may be arranged on the FPCB. The data driving circuit 80 supplies data signals to each pixel P. The data signals of the data driving circuit 80 are supplied to each pixel P through the connection wiring 51 connected to the pad 41 and the data line DL connected to the connection wiring 51. In an embodiment, as Figure 2 shown, the data driving circuit 80 may be arranged on the FPCB. In an embodiment, the data driving circuit 80 may be arranged in the peripheral area PA of the substrate 100.

[0073] The driving power supply wiring 60 may be arranged in the peripheral area PA. For example, the driving power supply wiring 60 may be arranged between one side of the display 10 adjacent to the pad structure 40 and the pad structure 40. The driving power ELVDD supplied through the connection wiring 61 connected to the pad 42 may be supplied to each of the pixels P through the driving voltage line PL.

[0074] The common power supply wiring 70 may be arranged in the peripheral area PA and may partially surround the display 10. For example, the common power supply wiring 70 has an annular shape with an open side on the side of the display 10 adjacent to the pad structure 40, and may extend along the edge of the substrate 100 except for the pad structure 40.

[0075] Figure 2 The common power supply wiring 70 is electrically connected to the connection wiring 71, the connection wiring 71 is connected to the pad 45, and the common power supply wiring 70 supplies the common power ELVSS to the counter electrode 330, for example, the cathode of the OLED of the pixel P (see Figure 14 ). In Figure 2 , the common power supply wiring 70 partially surrounds the display 10 in the form of an annulus with one open side, and the connection wiring 71 and the common power supply wiring 70 are integrally formed.

[0076] In an embodiment, a thin film encapsulation part for encapsulating the display 1 from the outside may also be provided on the display 1. The thin film encapsulation part may be provided as a plurality of layers in which an inorganic layer and an organic layer are alternately stacked. The thin film encapsulation part may cover the circuit parts (for example, the first scan driving circuit 20, the second scan driving circuit 30, and the common power supply wiring 70) arranged in the peripheral area PA and extend toward the edge of the substrate 100.

[0077] Figure 3 shows Figure 1 the equivalent circuit diagram of any one pixel of the display device 1.

[0078] Referring to Figure 3, the pixel P may include a pixel circuit PC connected to a scan line SL and a data line DL, and an OLED connected to the pixel circuit PC. The pixel circuit PC may include a driving thin-film transistor Td, a switching thin-film transistor Ts, and a storage capacitor Cst. The switching thin-film transistor Ts is connected to the scan line SL and the data line DL, and transmits a data signal input through the data line DL to the driving thin-film transistor Td in response to a scan signal input through the scan line SL.

[0079] The storage capacitor Cst is connected to the switching thin-film transistor Ts and a driving voltage line PL, and stores a voltage corresponding to the difference between the voltage received from the switching thin-film transistor Ts and the driving voltage ELVDD supplied to the driving voltage line PL.

[0080] The driving thin-film transistor Td is connected to the driving voltage line PL and the storage capacitor Cst, and may control a driving current flowing from the driving voltage line PL to the OLED in response to the value of the voltage stored in the storage capacitor Cst. The OLED may emit light with a certain brightness through the driving current. For example, the OLED may emit red light, green light, blue light, or white light.

[0081] In an embodiment, as Figure 3 shown, the pixel P may include two thin-film transistors and one storage capacitor. In an embodiment, the pixel circuit PC of the pixel P may be variously modified to include three or more thin-film transistors or two or more storage capacitors.

[0082] Returning to Figure 2 , the connection wirings 21, 31, 51, 61, and 71 may be positioned to pass through the first region 1A, the bending region BA, and the second region 2A, and a part of the connection wirings 21, 31, 51, 61, and 71 may pass through the bending region BA. As Figure 1 shown, the bending region BA may be bent about a bending axis BAX. When the bending region BA is bent about the bending axis BAX, defects (e.g., open circuits) may occur due to stress concentration on the connection wirings 21, 31, 51, 61, and 71 arranged on the bending region BA.

[0083] According to an embodiment, the display device 1 may have a structure with strong stress resistance, and if cracks are generated in a specific part of the multiple wirings due to the shape deformation of the multiple wirings in the bending region BA, the display device 1 also provides a bypass to prevent a complete open circuit of the wirings.

[0084] Figure 4 Shows Figure 1 a side view of the bending region BA of the substrate 100 of the display device 1. Figure 5 Shows Figure 1A plan view of a part of the bending region BA of the substrate 100 of the display device 1.

[0085] Referring to Figure 4 , the substrate 100 according to the present embodiment may include a first region 1A, a bending region BA, and a second region 2A arranged in sequence. The wiring 200 may be arranged to penetrate through the first region 1A, the bending region BA, and the second region 2A or may extend through the first region 1A, the bending region BA, and the second region 2A. In embodiments including Figure 4 and Figure 5 shown herein, the wiring 200 may be at least one of the above-mentioned connection wirings 21, 31, 51, 61, and 71. In an embodiment, the wiring 200 may be an appropriate wiring arranged to penetrate through the bending region BA.

[0086] When implementing an actual product, the bending region BA of the substrate 100 may be bent in such a way as to form a curved surface with respect to the bending axis BAX. However, the bending region BA may not bend with the same curvature throughout the entire region of the bending region BA, and it would actually be impossible to bend with the same curvature throughout the entire region of the bending region BA. For example, the bending region BA may bend with a relatively large curvature in one region thereof and with a relatively small curvature in another region thereof.

[0087] In an embodiment, the bending region BA may include a first bending region BA1 and a second bending region BA2 that bend with different curvatures. The first bending region BA1 may bend with a first curvature, and the second bending region BA2 may bend with a second curvature different from the first curvature. In an embodiment, the first curvature may be larger than the second curvature. This means that the radius of curvature R1 of the first bending region BA1 may be smaller than the radius of curvature R2 of the second bending region BA2.

[0088] In an embodiment, as Figure 4 shown, the first bending region BA1 and the second bending region BA2 may be arranged approximately symmetrically with respect to the bending axis BAX (for example, the first bending region BA1 and the second bending region BA2 may be arranged on both sides of the bending axis BAX). In an embodiment, the first bending region BA1 and the second bending region BA2 having different curvatures may be part or all of the bending region BA and may not necessarily be symmetric.

[0089] The first bending region BA1 may contact the first region 1A, extend from the first region 1A, or be directly adjacent to the first region 1A, and the second bending region BA2 may contact the first bending region BA1, extend from the first bending region BA1, or be directly adjacent to the first bending region BA1. The first region 1A, the first bending region BA1, and the second bending region BA2 may be arranged in sequence.

[0090] In an embodiment, the first bending region BA1 may contact the second region 2A, and the second bending region BA2 may contact the first bending region BA1. For example, the second region 2A, the first bending region BA1, and the second bending region BA2 may be arranged in sequence. In an embodiment, the first bending region BA1 may contact the first region 1A and the second region 2A formed in a plane. During bending, the force may be concentrated on the first bending region BA1. Compared with the second bending region BA2, the first bending region BA1 may bend with a relatively large curvature. The portion of the wiring 200 in the first bending region BA1 that bends with a relatively large curvature will receive or suffer greater stress than the portion of the wiring 200 in the second bending region BA2. This means that the possibility of occurrence of defects such as cracks and open circuits will be higher.

[0091] In an embodiment, as Figure 5 shown, when the shape of the wiring 200 is implemented differently according to the curvature of the bending region BA, the region that bends with a relatively large curvature and on which stress is concentrated may have a shape with strong stress resistance, and the region that bends with a relatively small curvature and on which stress is reduced may have a shape of multiple wirings that reduce electrical open circuits in the bending region. Therefore, the wiring 200 may have an optimal shape with strong stress resistance (e.g., or compensate for errors or damages caused by stress).

[0092] Referring to Figure 5 , each of the wirings 200 may include a first wiring 210 having a first shape and in the first bending region BA1 and a second wiring 220 having a second shape and in the second bending region BA2. As Figure 5 shown, the first shape and the second shape may be different from each other.

[0093] Each of the wirings 200 may have a shape of multiple wirings in the bending region BA. For example, each of the wirings 200 is branched and includes a first branched wiring W1 and a second branched wiring W2 located in the bending region BA. The first branched wiring W1 may include a first wire CL1 corresponding to or in the first bending region BA1 and a second wire CL2 on the second bending region BA2. The second branched wiring W2 may include a third wire CL3 on the first bending region BA1 and a fourth wire CL4 on the second bending region BA2. In the present application, the term "on the region" may also be referred to as "in the region".

[0094] The first wiring 210 on the first bending region BA1 may include the first wire CL1 and the third wire CL3. The second wiring 220 on the second bending region BA2 may include the second wire CL2 and the fourth wire CL4.

[0095] In an embodiment, as Figure 5 shown, each of the wirings 200 may include two branch wirings W1 and W2. In an embodiment, each of the wirings 200 may include three or more branch wirings. Thus, since each of the wirings 200 may include a first branch wiring W1 and a second branch wiring W2 on the bent region BA, a bypass for electrical connection can be provided when cracks and open circuits occur due to the stress applied to the bent region BA.

[0096] Compared with the second bent region BA2, stress may concentrate on the first bent region BA1 that is bent with a relatively large curvature, and the first bent region BA1 may have a structure with strong stress resistance. The first wiring 210 may have a stripe shape. For example, the first wire CL1 and the third wire CL3 may have a stripe shape. In an embodiment, the first wiring 210 may be implemented in various shapes, and the stripe shape may have the strongest stress resistance. Since stress can be evenly distributed over the entire area in a plane regardless of recessed or protruding portions, the stripe shape is characterized by having strong stress resistance. In an embodiment, the first wiring 210 (bent with a relatively large curvature) may have a stripe shape with strong stress resistance.

[0097] The second bent region BA2 (bent with a relatively small curvature compared to the first bent region BA1) may be subjected to less stress, and the wiring on the second bent region BA2 may have a shape with relatively weak stress resistance while reducing electrical open circuits. In an embodiment, the second wiring 220 may have a stepped shape. The stepped shape may indicate that the second wiring 220 may include a plurality of bridge lines BL that connect the second wire CL2 and the fourth wire CL4 to each other.

[0098] In this case, for effective stress reduction, the bridge lines BL may be arranged in a direction intersecting the second wire CL2 and the fourth wire CL4. For example, the bridge lines BL may be arranged obliquely at an angle θ with respect to the second wire CL2 and the fourth wire CL4. In an embodiment, for example, the angle θ may be about 45°. In an embodiment, the angle θ may vary according to the design.

[0099] In an embodiment, the bridge lines BL may be arranged in a zigzag pattern and may not be arranged in the same direction as Figure 5 shown.

[0100] Through the second wire CL2 and the fourth wire CL4 and the bridge lines BL, the second wiring 220 may have the same effect as having a plurality of holes H. For example, the second wiring 220 may include holes H, and each hole H may be defined by the second wire CL2 and the fourth wire CL4 and the bridge lines BL. In an embodiment, as Figure 5As shown, each hole H may have a parallelogram shape. In an embodiment, each hole H may have various shapes, such as circular, oval, polygonal, or a part thereof.

[0101] Figure 6 shows Figure 5 a plan view of another embodiment of

[0102] Figure 6 The embodiment of Figure 5 differs from the embodiment of Figure 6 in the first wiring 210. Except for the first wiring 210, Figure 5 the structure of the embodiment of

[0103] Referring to Figure 6 , the first wiring 210 may be bent or inclined at an angle θ2 with respect to the second wiring 220. In this regard, the bending with respect to the second wiring 220 can be interpreted as the bending of the second conductor CL2 and the fourth conductor CL4 with respect to the second wiring 220.

[0104] The first conductor CL1 and the second conductor CL2 may be integrally formed to form the first branch wiring W1, and the second conductor CL2 may be orthogonal to the bending axis BAX. Therefore, the first conductor CL1 may be bent or inclined at an angle θ2 with respect to the second conductor CL2. Similarly, the third conductor CL3 and the fourth conductor CL4 may be integrally formed to form the second branch wiring W2, and the fourth conductor CL4 may be orthogonal to the bending axis BAX. Therefore, the third conductor CL3 may be bent or inclined at an angle θ2 with respect to the fourth conductor CL4.

[0105] The angle θ2 at which the first wiring 210 is bent can be selected by considering the spacing and pitch between the wirings 200. In an embodiment, the angle θ2 between the inclined first conductor CL1 and the second conductor CL2 may be smaller than the angle θ1 between the bridge wire BL and the second conductor CL2.

[0106] The second conductor CL2 and the fourth conductor CL4 of the second wiring 220 may be substantially orthogonal to the bending axis BAX, the first wiring 210 may cross the bending axis BAX, but the first wiring 210 is not orthogonal to the bending axis BAX. As Figure 6 shown, the first wiring 210 (e.g., the first conductor CL1 and the third conductor CL3) may form an acute angle with respect to the bending axis BAX, so that the stress applied to the first bending region BA1 bent with a relatively large curvature compared to the second bending region BA2 can be reduced.

[0107] Figure 7 and Figure 8 showsFigure 5 Planar views of other embodiments of

[0108] Figure 7 and Figure 8 The embodiments of Figure 5 differ from the embodiments of Figure 5 and Figure 6 in the number of branch wirings W1, W2, and W3. For example, while Figure 7 and Figure 8 the above-described embodiments of

[0109] include two branch wirings W1 and W2, Figure 7 the embodiments of Figure 7 include three branch wirings W1, W2, and W3. In an embodiment, each wiring 200 may include four or more branch wirings. Figure 5 In the following description, only the differences will be mainly described, and redundant descriptions may be omitted.

[0110] Each wiring 200 may include a first branch wiring W1, a second branch wiring W2, and a third branch wiring W3. The first branch wiring W1 may include a first wire CL1 and a second wire CL2, the second branch wiring W2 may include a third wire CL3 and a fourth wire CL4, and the third branch wiring W3 may include a fifth wire CL5 and a sixth wire CL6. The first wire CL1, the third wire CL3, and the fifth wire CL5 may be on a first bending region BA1, and the second wire CL2, the fourth wire CL4, and the sixth wire CL6 may be on a second bending region BA2. For example, the first wiring 210 on the first bending region BA1 may include the first wire CL1, the third wire CL3, and the fifth wire CL5, and the second wiring 220 on the second bending region BA2 may include the second wire CL2, the fourth wire CL4, and the sixth wire CL6.

[0111] The second wiring 220 may further include a first bridge wire BL1 and a second bridge wire BL2. The first bridge wire BL1 may connect the second wire CL2 and the fourth wire CL4 to each other, and the second bridge wire BL2 may connect the fourth wire CL4 and the sixth wire CL6 to each other. Similar to the above-described embodiments, for effective stress reduction, the first bridge wire BL1 and the second bridge wire BL2 may be arranged in a direction crossing the second wire CL2 and the fourth wire CL4. For example, each of the first bridge wire BL1 and the second bridge wire BL2 may be arranged obliquely with respect to the second wire CL2, the fourth wire CL4, and the sixth wire CL6 at angles θ1 and θ3. In an embodiment, the angles θ1 and θ3 may be the same as each other, for example, about 45°. In an embodiment, the angles θ1 and θ3 may be different from each other.

[0112] Reference Figure 8 , Figure 8 is different from Figure 7 in the shape of the second wiring 220.

[0113] In Figure 8 , the second wiring 220 may have a chain shape in which straight lines and curves are mixed. In an embodiment, the second wiring 220 may include holes H, and the holes H may have a fan shape. The planar shape of each hole H may be a fan shape formed by two straight lines having ends contacting each other at a corner and a curve connecting the other ends of the two straight lines. In an embodiment, the planar shape of each hole H may have a shape of a figure formed by a curve and a straight line. For example, the planar shape of each hole H may be a polygon, a circle, an ellipse, or a part thereof.

[0114] For example, the second wiring 220 may include a bridge line BL that connects the second wire CL2 and the fourth wire CL4 in a zigzag shape. The bridge line BL may include a first bridge line BL1 and a second bridge line BL2. The first bridge line BL1 and the second bridge line BL2 may be arranged in a direction crossing each other, form an angle between the first bridge line BL1 and the second bridge line BL2, and may have a zigzag shape.

[0115] The first bridge line BL1 and the second bridge line BL2 may include a first contact portion CT1 and a second contact portion CT2 that respectively contact the second wire CL2 and the fourth wire CL4. The second wire CL2 and the fourth wire CL4 may respectively have an inwardly recessed shape at the first contact portion CT1 and the second contact portion CT2. For example, the second wire CL2 and the fourth wire CL4 may respectively have an outwardly rounded shape at the first contact portion CT1 and the second contact portion CT2.

[0116] The second wiring 220 may have holes H, and each hole H may be defined by a part of the second wire CL2 and the first bridge line BL1 and the second bridge line BL2, or by a part of the fourth wire CL4 and the first bridge line BL1 and the second bridge line BL2. In an embodiment, the shape of each hole H may be modified differently.

[0117] Figure 9 A side view of a bent region of a display device according to another embodiment is shown. Figure 10 Shown is Figure 9 a plan view of a part of the bent region of the display device of

[0118] In Figure 9 and Figure 10Among them, the bending region BA may include three or more regions having different curvatures from each other. In the following description, only the differences from the above-described embodiments will be mainly described, and redundant descriptions may be omitted.

[0119] Referring to Figure 9 , the substrate 100 according to the present embodiment may include a first region 1A, a bending region BA, and a second region 2A that are arranged in sequence. The wiring 200 may be arranged to penetrate through the first region 1A, the bending region BA, and the second region 2A.

[0120] In Figure 9 , the bending region BA of the substrate 100 may include a first bending region BA1, a second bending region BA2, and a third bending region BA3 having continuously changing curvatures. The first bending region BA1 may be bent with a first curvature, the second bending region BA2 may be bent with a second curvature, and the third bending region BA3 may be bent with a third curvature. In an embodiment, the first curvature, the second curvature, and the third curvature may satisfy the following equation.

[0121] First curvature > second curvature > third curvature

[0122] For example, the first bending region BA1 may be bent with the maximum curvature, the second bending region BA2 may be bent, and the third bending region BA3 may be bent with the minimum curvature. This means that the radius of curvature R1 of the first bending region BA1 may be smaller than the radius of curvature R2 of the second bending region BA2, and the radius of curvature R2 of the second bending region BA2 may be smaller than the radius of curvature R3 of the third bending region BA3. For example, the radii of curvature R1, R2, and R3 may satisfy the following equation.

[0123] Radius of curvature R1 < radius of curvature R2 < radius of curvature R3

[0124] In an embodiment, as shown in Figure 9 , the first bending region BA1, the second bending region BA2, and the third bending region BA3 may be arranged approximately symmetrically with respect to the bending axis BAX. In an embodiment, it is sufficient that the first bending region BA1, the second bending region BA2, and the third bending region BA3 having different curvatures form a part of the entire bending region BA, and the first bending region BA1, the second bending region BA2, and the third bending region BA3 do not have to be symmetric.

[0125] Referring to Figure 10 , each wiring 200 may include a first wiring 210 having a first shape and on the first bending region BA1, a second wiring 220 having a second shape and on the second bending region BA2, and a third wiring 230 having a third shape and on the third bending region BA3. As shown in Figure 10As shown, the first shape, the second shape, and the third shape may be different from each other.

[0126] Each wiring 200 may have a multi-wiring shape on the bending region BA. For example, each wiring 200 may branch and may include a first branch wiring W1, a second branch wiring W2, and a third branch wiring W3 on the bending region BA. The first branch wiring W1 may include a first wire CL1 on the first bending region BA1, a second wire CL2 on the second bending region BA2, and a third wire CL3 on the third bending region BA3. The second branch wiring W2 may include a fourth wire CL4 on the first bending region BA1, a fifth wire CL5 on the second bending region BA2, and a sixth wire CL6 on the third bending region BA3. The third branch wiring W3 may include a seventh wire CL7 on the first bending region BA1, an eighth wire CL8 on the second bending region BA2, and a ninth wire CL9 on the third bending region BA3.

[0127] The first wiring 210 on the first bending region BA1 may include the first wire CL1, the fourth wire CL4, and the seventh wire CL7. The second wiring 220 on the second bending region BA2 may include the second wire CL2, the fifth wire CL5, and the eighth wire CL8. The third wiring 230 on the third bending region BA3 may include the third wire CL3, the sixth wire CL6, and the ninth wire CL9.

[0128] The first bending region BA1 may be bent with a relatively large curvature compared to the second bending region BA2 and the third bending region BA3, so that stress is concentrated on the first bending region BA1, and the first bending region BA1 may have a structure with strong stress resistance. In an embodiment, the first wiring 210 may have a stripe shape. For example, the first wire CL1, the fourth wire CL4, and the seventh wire CL7 may have a stripe shape.

[0129] The first wiring 210 may be implemented in various shapes, and the stripe shape has been experimentally determined to have the strongest stress resistance. Because the stress can be evenly distributed over the entire region in a plane regardless of the concave or convex parts, the stripe shape is characterized by strong stress resistance. In an embodiment, the first wiring 210 bent with a relatively large curvature may have a stripe shape with strong stress resistance.

[0130] The second bending region BA2 and the third bending region BA3 bent with a relatively small curvature compared to the first bending region BA1 may be subjected to less stress, and the second bending region BA2 and the third bending region BA3 may have a shape with relatively weak stress resistance while reducing electrical open circuits.

[0131] In an embodiment, the second wiring 220 may have a chain shape. At least a part of each of the second wire CL2 and the eighth wire CL8 may be formed by a curve. The fifth wire CL5 may include a first bridge line BL1 and a second bridge line BL2 such that the second wire CL2 and the eighth wire CL8 may be connected in a zigzag manner. Figure 10 The shape of the second wiring 220 of Figure 8 is the same as that of the second wiring 220 of Figure 8 so the description in this regard of

[0132] In an embodiment, the third wiring 230 may have a stepped shape. The third wiring 230 may include a third wire CL3, a sixth wire CL6, and a ninth wire CL9 having a stripe shape, and may include a first bridge line BL1 connecting the third wire CL3 and the sixth wire CL6 to each other and a second bridge line BL2 connecting the sixth wire CL6 and the ninth wire CL9 to each other. Figure 10 The shape of the third wiring 230 of Figure 7 is the same as that of the second wiring 220 of Figure 7 so the description of

[0133] As described above, the first wiring 210, the second wiring 220, and the third wiring 230 may have different shapes, and each of the second wiring 220 and the third wiring 230 may have a plurality of first holes H1 and a plurality of second holes H2. The second wiring 220 and the third wiring 230 may have different shapes, and the first holes H1 of the second wiring 220 and the second holes H2 of the third wiring 230 may have different shapes. In an embodiment, the first holes H1 of the second wiring 220 may have a fan shape, and the second holes H2 of the third wiring 230 may have a parallelogram shape. In an embodiment, the first holes H1 and the second holes H2 may have various shapes.

[0134] Figure 11 A side view of a bent region of a display device according to another embodiment is shown. Figure 12 Shown is Figure 11 a plan view of a part of the bent region of the display device of

[0135] Figure 11 The embodiment of Figure 4 is similar to the embodiment of Figure 4 but they are different in the curvature of the bent region BA. For example, although in the bent region BA of Figure 11In the bending region BA, the first bending region BA1 that contacts the first region 1A which is a plane is characterized by bending with a curvature smaller than that of the second bending region BA2.

[0136] Referring to Figure 11 , the substrate 100 according to the present embodiment may include a first region 1A, a bending region BA, and a second region 2A arranged in sequence. The wiring 200 may be arranged to penetrate through the first region 1A, the bending region BA, and the second region 2A.

[0137] The bending region BA according to an embodiment may include a first bending region BA1 and a second bending region BA2 that bend with different curvatures. The first bending region BA1 may bend with a first curvature, and the second bending region BA2 may bend with a second curvature different from the first curvature. In an implementation, the second curvature may be larger than the first curvature. For example, the radius of curvature R1 of the first bending region BA1 may be larger than the radius of curvature R2 of the second bending region BA2.

[0138] In an implementation, as Figure 11 shown, the first bending region BA1 and the second bending region BA2 may be arranged approximately symmetrically with respect to the bending axis BAX. In an implementation, the first bending region BA1 and the second bending region BA2 having different curvatures may be part of or the whole of the bending region BA, and may not necessarily be symmetric.

[0139] Referring to Figure 12 , the second wiring 220 (bending with a relatively large curvature) on the second bending region BA2 may be subject to relatively large stress compared to the first wiring 210 on the first bending region BA1, so the possibility of occurrence of defects such as cracks and open circuits will increase.

[0140] Therefore, in Figure 12 , since the shape of each wiring 200 is implemented differently according to the curvature of the bending region BA, the optimal shape can be adopted according to the degree of stress.

[0141] Referring to Figure 12 , each wiring 200 may include a first wiring 210 having a first shape and on the first bending region BA1 and a second wiring 220 having a second shape and on the second bending region BA2.

[0142] Each wiring 200 may have a multi-wiring shape on the bending region BA. For example, each wiring 200 may branch and may include a first branch wiring W1 and a second branch wiring W2 on the bending region BA. The first branch wiring W1 may include a first wire CL1 on the first bending region BA1 and a second wire CL2 on the second bending region BA2, and the second branch wiring W2 may include a third wire CL3 on the first bending region BA1 and a fourth wire CL4 on the second bending region BA2.

[0143] The first wiring 210 on the first bending region BA1 may include the first wire CL1 and the third wire CL3, and the second wiring 220 on the second bending region BA2 may include the second wire CL2 and the fourth wire CL4.

[0144] The second bending region BA2 may be bent with a relatively large curvature compared to the first bending region BA1, stress may concentrate on the second bending region BA2, and the second bending region BA2 may have a structure with strong stress resistance.

[0145] In an embodiment, the first wiring 210 may have a stepped shape. Figure 12 The first wiring 210 of Figure 5 has the same shape as the second wiring 220 of

[0146] so the above description is used. Figure 12 The second wiring 220 of Figure 5 has the same shape as the first wiring 210 of

[0147] Figure 13 A cross-sectional view of a display device according to another embodiment is shown. Figure 14 Shows Figure 13 a cross-sectional view of the structure of the display panel 1000 of Figure 14 Corresponds to the cross-sectional structure taken along the lines A - A' and B - B' of the display device 1 of Figure 2

[0148] Referring to Figure 13 and Figure 14 the display panel 1000 may have a partially curved structure.

[0149] First, referring to Figure 14 the structure of the display panel 1000 will be described.

[0150] ​Referring to the display area DA, the OLED 300 and the thin film transistor 160 electrically connected thereto may be located in the display area DA of the substrate 100. Although not shown, if necessary, the thin film transistor 160 may be provided in the peripheral area PA outside the display area DA. For example, the thin film transistor (not shown) located in the peripheral area PA may be part of a driving circuit for controlling an electrical signal applied to the display area DA.

[0151] A buffer layer 110 including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride may be disposed on the substrate 100. The buffer layer 110 may increase the flatness of the upper surface of the substrate 100, or prevent or reduce the intrusion of impurities from the substrate 100 into the thin film transistor 160.

[0152] The thin film transistor 160 may be disposed on the buffer layer 110. The thin film transistor 160 may include a semiconductor layer 161 containing amorphous silicon, polycrystalline silicon, or an organic semiconductor material, a gate electrode 163, a source electrode 165a, and a drain electrode 165b.

[0153] To ensure insulation between the semiconductor layer 161 and the gate electrode 163, a gate insulating film 120 including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride may be interposed between the semiconductor layer 161 and the gate electrode 163.

[0154] In addition, an interlayer insulating film 130 including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride may be disposed on the gate electrode 163. The source electrode 165a and the drain electrode 165b may be disposed on the interlayer insulating film 130.

[0155] A first insulating layer 140 may be disposed on the thin film transistor 160. When the OLED 300 is disposed on the thin film transistor 160, the first insulating layer 140 may make the upper surface of the thin film transistor 160 substantially flat. For example, the first insulating layer 140 may be formed of an organic material such as propenyl, benzocyclobutene (BCB), or hexamethyldisiloxane (HMDSO).

[0156] The OLED 300 having a pixel electrode 310, a counter electrode 330, and an intermediate layer 320 having an emission layer interposed therebetween may be located on the first insulating layer 140. As Figure 14 shown, the pixel electrode 310 contacts either the source electrode 165a or the drain electrode 165b through a contact hole formed in the first insulating layer 140 to be electrically connected to the thin film transistor 160.

[0157] The second insulating layer 150 may be disposed on the first insulating layer 140. The second insulating layer 150 has openings corresponding to each sub-pixel, that is, openings exposing at least the central portion of the pixel electrode 310, thereby defining a pixel. In addition, the second insulating layer 150 increases the distance between the edge of the pixel electrode 310 and the counter electrode 330 above the pixel electrode 310, thereby preventing the generation of arcs at the edge of the pixel electrode 310. For example, the second insulating layer 150 may be formed of an organic material such as polyimide or HMDSO.

[0158] The intermediate layer 320 of the OLED 300 may include a low molecular material or a polymer material. When including a low molecular material, the intermediate layer 320 may have a structure in which a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) are stacked in a single structure or a composite structure. In addition, the intermediate layer 320 may include various organic materials including copper phthalocyanine (CuPc), N,N'-bis(naphthalen-1-yl)-N,N'-diphenyl-benzidine (NPB), or tris(8-hydroxyquinoline) aluminum (Alq 3 )). These layers may be formed by a vacuum deposition method.

[0159] When including a polymer material, the intermediate layer 320 may have a structure including an HTL and an EML. The HTL may include PEDOT, and the EML may include a polymer material such as a polyphenylene vinylene (PPV) - type material or a polyfluorene - type material. The intermediate layer 320 may be formed by a screen printing method, an inkjet printing method, or a laser - induced thermal imaging (LITI). The intermediate layer 320 may include an integrated layer spanning a plurality of pixel electrodes 310, or a patterned layer corresponding to each pixel electrode 310.

[0160] The counter electrode 330 is disposed in the upper part of the display area DA and over the entire surface of the display area DA. The counter electrode 330 is integrally formed in the display area DA and may correspond to the pixel electrode 310.

[0161] Since the OLED 300 can be easily damaged due to external moisture or oxygen, a thin - film encapsulation part 400 is arranged on the OLED 300 to protect the OLED. Although not shown, the thin - film encapsulation part 400 may cover the display area DA and extend to the peripheral area PA outside the display area DA.

[0162] The thin - film encapsulation part 400 may include a first inorganic layer 410, an organic layer 420, and a second inorganic layer 430.

[0163] The first inorganic layer 410 may cover the counter electrode 330 and may include silicon oxide, silicon nitride, and / or silicon oxynitride. If necessary, other layers such as a capping layer may be provided between the first inorganic layer 410 and the counter electrode 330. Since the first inorganic layer 410 is formed according to the structure under the first inorganic layer 410, the upper surface of the first inorganic layer 410 may not be flat.

[0164] Unlike the first inorganic layer 410, the organic layer 420 covering the first inorganic layer 410 may have a substantially flat upper surface. For example, the organic layer 420 may include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyacrylate, and / or hexamethyldisiloxane.

[0165] The second inorganic layer 430 may cover the organic layer 420 and may include an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride. The second inorganic layer 430 contacts the first inorganic layer 410 at the edge of the second inorganic layer 430 located outside the display area DA, thereby preventing the organic layer 420 from being exposed to the outside.

[0166] Referring to the peripheral area PA, the wiring 200 may be on the bending area BA. The wiring 200 may include a first wiring 210 corresponding to the first bending area BA1 and a second wiring 220 corresponding to the second bending area BA2. Since the first bending area BA1 and the second bending area BA2 are bent with different curvatures, the first wiring 210 and the second wiring 220 may have different shapes. In an embodiment, Figure 14 in, the second wiring 220 may have a hole H. The shape of the wiring 200 in the plane may be one of the shapes of the above embodiments.

[0167] Referring to Figure 13 , the polarization member 1100 and the touch member 1300 are arranged in Figure 14 the first area 1A of the display panel 1000, and an adhesive member 1200 such as an optically clear adhesive (OCA) may be provided between the polarization member 1100 and the touch member 1300. Although Figure 13 shows a case where the touch member 1300 is separately attached above the display panel 1000, in another embodiment, the touch member 1300 may be directly provided on the thin film encapsulation part 400 to be included in the display panel 1000.

[0168] A structure 1600 for maintaining the bending structure may be arranged between the first area 1A and the second area 2A of the display panel 1000, and protective films 1400 and 1500 may be respectively provided between the structure 1600 and the first area 1A and the second area 2A of the display panel 1000.

[0169] The organic layer 1700 is disposed in the bending region BA of the display panel 1000. The organic layer 1700 reduces the stress in the bending region BA, thereby protecting the wiring 200 located in the bending region BA. The organic layer 1700 may extend to a part of each of the first region 1A and the second region 2A.

[0170] Figure 15 and Figure 16 A plan view of a bending region of a display device according to another embodiment and a part of the first region and the second region in contact with the bending region is shown.

[0171] Referring to Figure 15 , Figure 15 the first bending region BA1 and the second bending region BA2 of Figure 5 correspond to the first bending region BA1 and the second bending region BA2 of Figure 5 As described above, each wiring 200 may branch and include a first branch wiring W1 and a second branch wiring W2 on the bending region BA. The bending region BA may include a first curvature region CA1 bent with a first curvature and a second curvature region CA2 bent with a second curvature. The first curvature region CA1 corresponds to or may be on the first bending region BA1, and the second curvature region CA2 corresponds to or may be on the second bending region BA2. The second curvature region CA2 may include a bending axis BAX, and the first bending region BA1 and the second bending region BA2 may be symmetrically arranged with respect to the bending axis BAX.

[0172] The shape of the wiring 200 is the same as that described in Figure 5 and redundant descriptions are omitted.

[0173] Referring to Figure 16 , Figure 16 the first bending region BA1 and the second bending region BA2 of Figure 8 correspond to the first bending region BA1 and the second bending region BA2 of Figure 8 As described above, each wiring 200 may branch and include a first branch wiring W1, a second branch wiring W2, and a third branch wiring W3 on the bending region BA. The bending region BA may include a first curvature region CA1 bent with a first curvature and a second curvature region CA2 bent with a second curvature. The first curvature region CA1 corresponds to or may be on the first bending region BA1, and the second curvature region CA2 corresponds to or may be on the second bending region BA2. The second curvature region CA2 may include a bending axis BAX, and the first bending region BA1 and the second bending region BA2 may be symmetrically arranged with respect to the bending axis BAX.

[0174] The shape of the wiring 200 may be the same as that described in Figure 8 , and thus redundant descriptions are omitted.

[0175] By summarizing and reviewing, in some display devices, during the process of manufacturing a flexible display device, defects may occur or the lifespan of the display device may be shortened.

[0176] As described above, according to the above embodiments, a long lifespan of the display device can be ensured, and the occurrence of defects such as open circuits in the manufacturing process can be reduced.

[0177] Example embodiments have been disclosed herein. Although specific terms are used, the specific terms are used and interpreted only in a general and descriptive sense and not for the purpose of limitation. In some cases, unless otherwise specifically stated, it will be apparent to those of ordinary skill in the art that, since the filing of this application, the features, characteristics, and / or elements described in connection with specific embodiments may be used alone or in combination with the features, characteristics, and / or elements described in connection with other embodiments. Therefore, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the claims.

Claims

1. A display device, the display device comprising: a flexible substrate, the flexible substrate comprising: a first region in which an image is displayed; a second region separated from the first region; and a bending region located between the first region and the second region; a display located on the first region of the flexible substrate; a pad located on the second region of the flexible substrate; and a plurality of wirings located on the flexible substrate, each of the plurality of wirings comprising: a first wiring having a first shape; and a second wiring having a second shape different from the first shape, the first wiring and the second wiring passing through the bending region, wherein the bending region comprises: a first bending region contacting the first region and having a first curvature; and a second bending region contacting the first bending region and having a second curvature different from the first curvature, wherein the first curvature is greater than the second curvature, wherein the first wiring is located on the first bending region, and the second wiring is located on the second bending region, wherein each of the plurality of wirings branches and comprises a first branch wiring and a second branch wiring, wherein the first branch wiring comprises a first wire located on the first bending region and a second wire located on the second bending region, wherein the second branch wiring comprises a third wire located on the first bending region and a fourth wire located on the second bending region, and wherein the second wiring further comprises a bridge wire connecting the second wire to the fourth wire, and the first wiring does not comprise a bridge wire.

2. The display device according to claim 1, wherein, the first branch wiring and the second branch wiring are located on the bending region.

3. The display device according to claim 2, wherein, each of the first wire and the third wire of the first wiring has a stripe shape.

4. The display device according to claim 3, wherein, the bridge wire is arranged in a direction crossing the second wire and the fourth wire.

5. The display device according to claim 1, wherein, the first wiring is angled and inclined with respect to the second wiring.

6. The display device according to claim 5, wherein: the bending region is bent along a bending axis extending in a first direction, and the second wiring is arranged orthogonally to the bending axis.

7. The display device according to claim 1, wherein: the bridge wire comprises a first bridge wire and a second bridge wire arranged in a direction crossing each other.

8. The display device according to claim 7, wherein, each of the second wire and the fourth wire has a portion contacting the bridge wire, and the portion has an inwardly recessed shape.

9. The display device according to claim 7, wherein, each of the second wire and the fourth wire has a portion contacting the bridge wire, and the portion has an outwardly circular shape.

10. The display device according to claim 7, wherein, On a plane, the second wiring includes a hole surrounded by the second wire and the bridge wire, or a hole surrounded by the fourth wire and the bridge wire, and the hole has a fan shape.

11. The display device according to claim 1, wherein, The same signal is input to each of the first branch wiring and the second branch wiring.

12. The display device according to claim 1, wherein, The first wiring has a stripe shape.

13. The display device according to claim 1, wherein, The second wiring has a plurality of holes.

14. The display device according to claim 13, wherein, The second wiring has a curved shape in at least a part of its area.

15. The display device according to claim 1, wherein: The curved area further includes a third curved area that contacts the second curved area and has a third curvature different from the first curvature and the second curvature, and Each of the plurality of wirings includes a third wiring that is in the third curved area and has a third shape different from the first shape and the second shape.

16. The display device according to claim 15, wherein, The first curvature, the second curvature, and the third curvature satisfy the following equation: First curvature > Second curvature > Third curvature.

17. The display device according to claim 1, wherein, The first wiring includes a plurality of holes.

18. The display device according to claim 1, wherein: The curved area is symmetric about the bending axis, and The first curved area and the second curved area are located on one side with respect to the bending axis.

19. A display device, the display device comprises: A substrate, the substrate includes a curved area located between a first area and a second area and bent around a bending axis, the curved area includes: a first curvature area bent with a first curvature; and a second curvature area located between the first curvature area and each of the first area and the second area and bent with a second curvature different from the first curvature; A display, located in the first area of the substrate; and A plurality of wirings, extending in a direction crossing the bending axis and passing through the curved area, each of the plurality of wirings has a first shape in the first curvature area and a second shape different from the first shape in the second curvature area, wherein each of the plurality of wirings has a multi-wiring shape on the curved area, and wherein each of the plurality of wirings does not include a bridge wire connecting the multi-wirings to each other in the area with a larger curvature among the first curvature area and the second curvature area.

20. The display device according to claim 19, wherein: The second curvature is larger than the first curvature, and The second shape is a stripe shape not including the bridge wire.

21. The display device according to claim 19, wherein: The first curvature is larger than the second curvature, and The first shape is a stripe shape not including the bridge wire.

22. The display device according to claim 19, wherein, Each branch of the plurality of wirings, so as to have the shape of the multi-wiring on the curved region.

23. The display device according to claim 22, wherein, each of the plurality of wirings further includes the bridge lines that connect the multi-wirings to each other in the regions with smaller curvatures in the first curvature region and the second curvature region.

24. The display device according to claim 22, wherein, each of the plurality of wirings includes a plurality of holes in the regions with smaller curvatures in the first curvature region and the second curvature region.

25. The display device according to claim 22, wherein, each of the plurality of wirings has a curved shape in at least a part of the regions with smaller curvatures in the first curvature region and the second curvature region of each wiring.

Images