Display device

Abstract

The present invention provides a display device comprising: a substrate having first and second surfaces opposite to each other and including island areas and bridge areas which connect adjacent island areas and have serpentine shapes; and wirings arranged on the first surface of the bridge areas. A plurality of groove patterns are defined in the bridge areas to be open toward the second surface.

Description

display device

[0001] Embodiments of the present invention relate to a display device, for example, a flexible display device.

[0002] As display devices that visually display electrical signals evolve, a variety of display devices with superior characteristics, such as thinness, lightness, and low power consumption, are being introduced. For example, flexible display devices that can be folded or rolled are being introduced. Recently, active research and development is underway on display devices with diverse structures, such as stretchable display devices capable of transforming into various forms.

[0003] Embodiments of the present invention provide a display device, for example, a flexible display device.

[0004] According to one aspect of the present invention, a display device is provided, comprising a substrate having first and second surfaces facing each other, including bridge regions having a meandering shape and connecting island regions and neighboring island regions, and a wiring disposed on the first surface of the bridge region, wherein a plurality of groove patterns are defined in the bridge region to be open in the second surface direction.

[0005] In one embodiment, each of the bridge regions may include two round portions and a straight portion between the two round portions.

[0006] In one embodiment, each of the two round portions includes an inner edge and an outer edge, and the plurality of groove patterns can be arranged along the inner edge.

[0007] In one embodiment, each of the two round portions includes an inner edge and an outer edge, and the plurality of groove patterns can be arranged along the outer edge.

[0008] Each of the two round portions may include an inner edge and an outer edge, and at least one of the plurality of groove patterns may be arranged along the inner edge, and the remainder of the plurality of groove patterns may be arranged along the outer edge.

[0009] In one embodiment, the at least one groove pattern arranged along the inner edge and the remaining groove patterns arranged along the outer edge may be arranged in an alternating manner.

[0010] In one embodiment, the bridge region includes a first edge and a second edge, and each of the plurality of groove patterns can extend from the first edge of the bridge region to the second edge of the bridge region.

[0011] In one embodiment, in a direction perpendicular to the extension direction of the bridge region, the width of the bridge region and the width of each of the plurality of groove patterns may be the same.

[0012] In one embodiment, the plurality of groove patterns are arranged on the two round portions and the straight portion, and the spacing between the groove patterns arranged on the round portion may be smaller than the spacing between the groove patterns arranged on the straight portion.

[0013] In one embodiment, the plurality of groove patterns are arranged on the two round portions and the straight portion, and the width of the bridge region of the groove patterns arranged on the round portion in the extension direction may be greater than the width of the bridge region of the groove patterns arranged on the straight portion in the extension direction.

[0014] In one embodiment, the substrate includes a first base layer and a second base layer on the first base layer, and each of the plurality of groove patterns can be defined by an opening defined in the first base layer.

[0015] In one embodiment, the substrate includes a first base layer and a second base layer on the first base layer, and each of the plurality of groove patterns can be defined by an opening defined in the first base layer and the second base layer.

[0016] In one embodiment, the bridge region includes a first region overlapping the wiring and a second region outside the first region, and the plurality of groove patterns can be arranged in the second region.

[0017] In one embodiment, each of the plurality of groove patterns may have a width in the extension direction of the bridge region that becomes wider as it approaches the edge of the bridge region.

[0018] In one embodiment, each of the plurality of groove patterns may have a width in the extension direction of the bridge region that becomes narrower as it approaches an edge of the bridge region.

[0019] In one embodiment, each of the plurality of groove patterns on the planar surface may have a rounded edge along an arc of a virtual circle or a virtual ellipse.

[0020] According to another aspect of the present invention, a substrate having first and second surfaces facing each other and including bridge regions having a meandering shape and connecting island regions and neighboring island regions, and wiring disposed on each of the first surfaces of the bridge regions, wherein a plurality of groove patterns may be defined to be open in the second surface direction on a portion of the island region adjacent to the bridge regions and a portion of the bridge regions adjacent to the island region.

[0021] In one embodiment, each of the bridge regions has a first edge and a second edge, and the plurality of groove patterns can be arranged along the first edge of each of the bridge regions and along an edge of the island region connected to the first edge.

[0022] In one embodiment, each of the bridge regions has a first edge and a second edge, at least one of the plurality of groove patterns may be disposed along the first edge of each of the bridge regions and an edge of the island region connected to the first edge, and the remainder of the plurality of groove patterns may be disposed along the second edge of each of the bridge regions and an edge of the island region connected to the second edge.

[0023] In one embodiment, each of the bridge regions has a first edge and a second edge, and the plurality of groove patterns are arranged along the first edge of each of the bridge regions and an edge of the island region connected to the first edge, wherein at least one of the plurality of groove patterns can extend from the first edge of the bridge region to a second edge of the bridge region or to an edge of the island region connected to the second edge.

[0024] According to another aspect of the present invention, a display device having a display area and a non-display area outside the display area, the display device including island areas and bridge areas connecting adjacent island areas and having a meandering shape, the display device including a substrate having first and second surfaces facing each other, and a wiring disposed on the first surface of the bridge area, wherein a plurality of groove patterns are defined on the substrate to be open in the second surface direction, and the display area may include a plurality of sub-areas having different elongation rates.

[0025] In one embodiment, the density of groove patterns in each of the plurality of sub-regions may be different.

[0026] In one embodiment, the plurality of sub-regions may include a first sub-region, a second sub-region outside the first sub-region, and a third sub-region outside the second sub-region, and the density of groove patterns of the first sub-region may be higher than the density of groove patterns of the second sub-region, and the density of groove patterns of the second sub-region may be higher than the density of groove patterns of the third sub-region.

[0027] In one embodiment, the plurality of sub-regions may include a first sub-region, a second sub-region outside the first sub-region, and a third sub-region outside the second sub-region, and the density of groove patterns of the first sub-region may be lower than the density of groove patterns of the second sub-region, and the density of groove patterns of the second sub-region may be lower than the density of groove patterns of the third sub-region.

[0028] In one embodiment, the plurality of sub-regions include a first sub-region, a second sub-region outside the first sub-region, and a third sub-region outside the second sub-region, and the density of groove patterns of the second sub-region may be higher than the density of groove patterns of the first sub-region and the density of groove patterns of the third sub-region.

[0029] Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims and detailed description of the invention.

[0030] According to one embodiment of the present invention, a display device capable of preventing damage due to concentration of stress and being stretchable in various directions can be provided.

[0031] These effects are exemplary and the scope of the present invention is not limited by the above-described effects.

[0032] FIG. 1 is a perspective view schematically showing a display device according to one embodiment of the present invention.

[0033] Figures 2a and 2b are perspective views showing the display device of Figure 1 extended in the first direction.

[0034] Figure 2c is a perspective view showing the display device of Figure 1 extended in the second direction.

[0035] Figure 2d is a perspective view showing the display device of Figure 1 extended in the first direction and the second direction.

[0036] Figure 2e is a perspective view showing the display device of Figure 1 extended in the third direction.

[0037] Figure 3 is a schematic plan view of a display device according to one embodiment of the present invention.

[0038] FIG. 4 is an enlarged plan view of part IV of FIG. 3 as part of a display device according to one embodiment of the present invention.

[0039] FIG. 5 is a cross-sectional view schematically showing a first island portion and a first bridge portion arranged in a display area of ​​a display device according to one embodiment of the present invention.

[0040] FIGS. 6A to 6C are equivalent circuit diagrams of subpixels of a display device according to one embodiment of the present invention, respectively.

[0041] FIG. 7a and FIG. 7b are cross-sectional views schematically showing a light-emitting element of a display device according to one embodiment of the present invention, respectively.

[0042] FIG. 8 is a plan view showing an excerpt of one first bridge unit included in a display device according to one embodiment of the present invention.

[0043] FIGS. 9A to 9D are cross-sectional views schematically illustrating a cross-section of one first bridge portion included in a display device according to one embodiment of the present invention, respectively.

[0044] FIG. 10a is a plan view showing an excerpt of one first bridge part included in a display device according to one embodiment of the present invention, and FIG. 10b is a cross-sectional view showing a cross-section along line Ⅲ-Ⅲ' of the first bridge part shown in FIG. 10a.

[0045] FIG. 11a is a plan view showing an excerpt of one first bridge part included in a display device according to one embodiment of the present invention, and FIG. 11b is a cross-sectional view showing a cross-section along line IV-IV' of the first bridge part shown in FIG. 11a.

[0046] FIG. 12a is a plan view showing an excerpt of one first bridge part included in a display device according to one embodiment of the present invention, and FIG. 12b is a cross-sectional view showing a cross-section along line V-V' of the first bridge part shown in FIG. 12a.

[0047] FIG. 13a is a plan view showing an excerpt of one first bridge part included in a display device according to one embodiment of the present invention, and FIG. 13b is a cross-sectional view showing a cross-section along line VI-VI' of the first bridge part shown in FIG. 13a.

[0048] FIG. 14 is a plan view showing an excerpt of one first bridge unit included in a display device according to one embodiment of the present invention.

[0049] FIG. 15a is a plan view showing an excerpt of one first bridge part included in a display device according to one embodiment of the present invention, and FIG. 15b is a cross-sectional view showing a cross-section along line VII-VIII' of the first bridge part shown in FIG. 15a.

[0050] FIGS. 16A to 16C are plan views schematically illustrating a portion of one first bridge unit included in a display device according to one embodiment of the present invention.

[0051] FIG. 17a is a plan view schematically illustrating a portion of a display device according to one embodiment of the present invention, and FIGS. 17b and 17c are cross-sectional views schematically illustrating a cross-section of one first island portion included in a display device according to one embodiment of the present invention, respectively.

[0052] FIGS. 18A and 18B are plan views schematically illustrating a portion of a display device according to one embodiment of the present invention, respectively.

[0053] FIGS. 19A to 19D are schematic plan views each showing a display device according to an embodiment of the present invention.

[0054] FIGS. 20A to 20E are plan views schematically illustrating a display device according to one embodiment of the present invention, respectively.

[0055] FIGS. 21A to 21C are schematic plan views each showing a display device according to an embodiment of the present invention.

[0056] FIGS. 22a and 22b are schematic plan views each showing a display device according to one embodiment of the present invention.

[0057] FIGS. 23A to 23G are perspective views schematically illustrating embodiments of an electronic device including a display device according to one embodiment of the present invention, respectively.

[0058] One embodiment of the present invention provides a display device including a substrate having first and second surfaces facing each other and including bridge regions having a meandering shape and connecting island regions and neighboring island regions, and a wiring disposed on the first surface of the bridge region, wherein a plurality of groove patterns are defined in the bridge region to be open in the second surface direction.

[0059] The present invention is capable of various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, as well as the methods for achieving them, will become clearer with reference to the embodiments described in detail below, along with the drawings. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various forms.

[0060] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals and redundant descriptions thereof will be omitted.

[0061] In this specification, the terms first, second, etc. are not used in a limiting sense, but are used for the purpose of distinguishing one component from another.

[0062] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0063] In this specification, terms such as “include” or “have” mean that a feature or component described in the specification exists, and do not preclude the possibility that one or more other features or components may be added.

[0064] In this specification, when it is said that a part such as a film, region, or component is on or above another part, it includes not only the case where it is directly on top of the other part, but also the case where another film, region, component, etc. is interposed in between.

[0065] In this specification, when it is said that a film, region, component, etc. are connected, it includes cases where the films, regions, components, etc. are directly connected, and / or cases where other films, regions, components, etc. are interposed between the films, regions, components, etc. and are indirectly connected. For example, when it is said in this specification that a film, region, component, etc. are electrically connected, it refers to cases where the films, regions, components, etc. are directly electrically connected, and / or cases where other films, regions, components, etc. are interposed between them and are indirectly electrically connected.

[0066] In this specification, relative terms such as "below" or "lower" and "above" or "upper" are intended to indicate the relationship between one component and another. These relative terms may be interpreted differently depending on the orientation of the device depicted in the drawings. For example, if the device depicted in the drawings is flipped over, a second component described as being located "below" a first component may actually be located "above" the first component. In other words, the term "lower" can mean either "lower" or "upper" depending on the orientation of the device.

[0067] In this specification, “A and / or B” refers to the case where it is A, or B, or both A and B. And, “at least one of A and B” refers to the case where it is A, or B, or both A and B.

[0068] In this specification, the x-axis, y-axis, and z-axis are not limited to the three axes on the orthogonal coordinate system, and can be interpreted in a broad sense that includes them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but they may also refer to different directions that are not orthogonal to each other.

[0069] In some embodiments of this specification, where implementations are otherwise feasible, specific process sequences may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0070] For convenience of explanation, the sizes of components in the drawings may be exaggerated or reduced. For example, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to what is shown.

[0071] Fig. 1 is a perspective view schematically illustrating a display device (1) according to one embodiment of the present invention. Figs. 2a and 2b are perspective views illustrating the display device (1) of Fig. 1 in a state extended in a first direction. Fig. 2c is a perspective view illustrating the display device (1) of Fig. 1 in a state extended in a second direction. Fig. 2d is a perspective view illustrating the display device (1) of Fig. 1 in a state extended in the first and second directions. Fig. 2e is a perspective view illustrating the display device (1) of Fig. 1 in a state extended in a third direction.

[0072] Referring to FIG. 1, a display device (1) may include a display area (DA) and a non-display area (NDA). The display area (DA) may include a plurality of pixels. The display device (1) may provide a predetermined image using light emitted from the plurality of pixels. The non-display area (NDA) may be arranged outside the display area (DA). The non-display area (NDA) is an area where pixels are not arranged and may entirely surround the display area (DA).

[0073] The display device (1) can be extended or contracted in various directions. The display device (1) can be extended in a first direction (e.g., the x direction and / or the -x direction) by an external force applied by an external object or a user. In one embodiment, as illustrated in FIGS. 2A and 2B, the display area (DA) and / or the non-display area (NDA) of the display device (1) can be extended in the first direction (e.g., the x direction and / or the -x direction). For example, as illustrated in FIG. 2A, the display device (1) can be extended along the x direction and the -x direction, or as illustrated in FIG. 2B, one side of the display device (1) can be fixed and the display device (1) can be extended along the x direction.

[0074] The display device (1) can be stretched in a second direction (e.g., the y direction and / or the -y direction) by an external force applied by an external object or a user. In one embodiment, as illustrated in FIG. 2c, the display area (DA) and / or the non-display area (NDA) of the display device (1) can be stretched in the y direction and the -y direction. In another embodiment, one side of the display device (1) can be fixed while being stretched in the y direction or the -y direction.

[0075] The display device (1) can be extended in a plurality of directions, for example, a first direction (e.g., the x direction and / or the -x direction) and a second direction (e.g., the y direction and / or the -y direction) by an external force applied by an external object or a part of a human body. As illustrated in Fig. 2d, the display area (DA) and / or the non-display area (NDA) of the display device (1) can be extended in the ±x direction and the ±y direction.

[0076] The display device (1) can be elongated in a third direction (e.g., the z direction or the -z direction) by an external force applied by an external object or a part of a human body. In one embodiment, FIG. 2e illustrates that a part of the display device (1), for example, a part of the display area (DA), protrudes in the z direction. In another embodiment, a part of the display device (1), for example, a part of the display area (DA), can protrude along the -z direction (or be sunken along the z direction).

[0077] Although FIGS. 2A to 2E illustrate the display device (1) extending in the first, second, and / or third directions, the present invention is not limited thereto. In other embodiments, the display device (1) may be variously deformed into an irregular shape, such as being bent or twisted along two or more axes.

[0078] Figure 3 is a schematic plan view of a display device according to one embodiment of the present invention.

[0079] A plurality of pixels may be arranged in a display area (DA) of a display device (1). Each pixel may include subpixels that emit light of different colors. A light-emitting element corresponding to each subpixel may be arranged in the display area (DA). A circuit for providing electrical signals to the light-emitting elements arranged in the display area (DA) and to transistors electrically connected to the light-emitting elements may be located in a non-display area (NDA) surrounding the display area (DA). A gate driving circuit (GDC) may be arranged in a first non-display area (NDA1) and a second non-display area (NDA2) respectively, which are arranged on opposite sides of the display area (DA). The gate driving circuit (GDC) may include drivers for providing electrical signals to the gate electrodes of the transistors electrically connected to the light-emitting elements. FIG. 3 illustrates that the gate driving circuit (GDC) is arranged in each of the first non-display area (NDA1) and the second non-display area (NDA2), but the present invention is not limited thereto. In another embodiment, the gate drive circuit (GDC) may be placed in either the first non-display area (NDA1) or the second non-display area (NDA2).

[0080] The data drive circuit (DDC) may be disposed in a third non-display area (NDA3) and / or a fourth non-display area (NDA4) connecting the first non-display area (NDA1) and the second non-display area (NDA2). In one embodiment, FIG. 3 illustrates that the data drive circuit (DDC) is disposed in the fourth non-display area (NDA4). In another embodiment, the data drive circuit (DDC) may be disposed in each of the third non-display area (NDA3) and the fourth non-display area (NDA4).

[0081] Although Fig. 3 illustrates that the data drive circuit (DDC) is arranged in the fourth non-display area (NDA4) of the display device (1), the present invention is not limited thereto. In another embodiment, the display device (1) may further include a flexible circuit board (not shown) electrically connected through a terminal portion (not shown) arranged in the fourth non-display area (NDA4), and the data drive circuit (DDC) may be arranged on the aforementioned flexible circuit board.

[0082] In some embodiments, the elongation rate of the non-display area (NDA) may be equal to or less than the elongation rate of the display area (DA). In one embodiment, the elongation rates of the non-display areas (NDAs) may be different for each area. For example, the first non-display area (NDA1), the second non-display area (NDA2), and the third non-display area (NDA3) may have substantially the same elongation rates, but the elongation rate of the fourth non-display area (NDA4) may be less than the elongation rates of each of the first non-display area (NDA1), the second non-display area (NDA2), and the third non-display area (NDA3).

[0083] FIG. 4 is an enlarged plan view of part IV of FIG. 3 as part of a display device according to one embodiment of the present invention.

[0084] Referring to FIG. 4, the display device (1) may include first island portions (11) spaced apart from each other in a first direction (e.g., x direction or -x direction) and a second direction (e.g., y direction or -y direction) in a display area (DA), and first bridge portions (12) connecting adjacent first island portions (11).

[0085] The first bridge portions (12) may be arranged to be spaced apart from each other by a first opening (CS1) located between the first bridge portions (12). The first bridge portion (12) may have a winding shape. For example, as illustrated in FIG. 4, the first bridge portion (12) may have a shape roughly like the letter "S" or a shape similar to the letter "S".

[0086] Each first island portion (11) may be connected to a plurality of first bridge portions (12). For example, each first island portion (11) may be connected to four first bridge portions (12). Two first bridge portions (12) may be arranged on opposite sides of the first island portion (11) along a first direction (e.g., x direction or -x direction), and the remaining two first bridge portions (12) may be arranged on opposite sides of the first island portion (11) along a second direction (e.g., y direction or -y direction). The four first bridge portions (12) may be connected to four sides of the first island portion (11), respectively. Each of the four first bridge portions (12) may be adjacent to each corner of the first island portion (11).

[0087] The display device (1) may include second island portions (21) spaced apart from each other in a first direction (e.g., x direction or -x direction) and a second direction (e.g., y direction or -y direction) in a non-display area, for example, a first non-display area (NDA1) illustrated in FIG. 4, and second bridge portions (22) connecting adjacent second island portions (21) to each other. In other words, the second bridge portions (22) may be connected between adjacent second island portions (21).

[0088] The second bridge portions (22) may be arranged to be spaced apart from each other by a second opening (CS2) positioned (defined) between the second bridge portions (22). The second bridge portion (22) may have a winding shape. For example, as illustrated in FIG. 4, the second bridge portion (22) may have a shape roughly similar to the letter “S” or the letter “S”. The size and / or width of the second bridge portion (22) may be different from the size and / or width of the first bridge portion (12). For example, the size and / or width of the second bridge portion (22) may be larger than the size and / or width of the first bridge portion (12). The radius of curvature of the rounded (or bent) portion of the second bridge portion (22) may be different from the radius of curvature of the rounded portion of the first bridge portion (12). For example, the radius of curvature of the rounded portion of the second bridge portion (22) may be greater than the radius of curvature of the rounded portion of the first bridge portion (12).

[0089] Each second island portion (21) can be connected to a plurality of second bridge portions (22). Each second island portion (21) can be connected to four second bridge portions (22). Two second bridge portions (22) can be arranged on opposite sides of the second island portion (21) along a first direction (e.g., x direction or -x direction), and the remaining two second bridge portions (22) can be arranged on opposite sides of the second island portion (21) along a second direction (e.g., y direction or -y direction). In one embodiment, four second bridge portions (22) can be respectively connected to four sides of the second island portion (21). Each second bridge portion (22) can be connected to a central portion of each side of the second island portion (21).

[0090] The second island portions (21) of any one row arranged in the first non-display area (NDA1) may correspond to the first island portions (11) of a plurality of rows arranged in the display area (DA). For example, the second island portions (21) of any one row arranged in the first non-display area (NDA1) may correspond to the first island portions (11) arranged in the (i)-th row of the display area (DA) and the first island portions (11) arranged in the (i+1)-th row (here, i is a positive integer greater than 0). In another embodiment, the second island portions (21) of any one row may correspond to n rows of the first island portions (11) (here, n is a positive integer greater than 3).

[0091] A non-display area, for example, a first non-display area (NDA1), may include a first sub-non-display area (SNDA1) in which the aforementioned second island portions (21) and second bridge portions (22) are arranged, and a second sub-non-display area (SNDA2) between the first sub-non-display area (SNDA1) and the display area (DA). Third bridge portions (23) may be arranged in the second sub-non-display area (SNDA2) to connect the display area (DA) and the first sub-non-display area (SNDA1). One end of the third bridge portion (23) may be connected to the second island portion (21), and the other end of the third bridge portion (23) may be connected to the first island portion (11). For example, one end of the third bridge portion (23) may be connected to the central portion of one side of the second island portion (21), and the other end of the third bridge portion (23) may be connected to the central portion of one side of the first island portion (11).

[0092] The third bridge portion (23) may have a winding shape. In one embodiment, the shape of the third bridge portion (23) may be different from the shapes of the first bridge portion (12) and the second bridge portion (22). The width of the third bridge portion (23) may be different from the width of the first bridge portion (12) and the width of the second bridge portion (22). The width of the third bridge portion (23) may be larger than the width of the first bridge portion (12) and smaller than the width of the second bridge portion (22). Third openings (CS3) and fourth openings (CS4) of different shapes may be alternately arranged between the third bridge portions (23) in the second direction (e.g., the y direction or the -y direction).

[0093] FIG. 5 is a cross-sectional view schematically showing a first island portion (11) and a first bridge portion (12) arranged in a display area (DA) of a display device (1) according to one embodiment of the present invention.

[0094] Referring to Fig. 5, the first island portion (11) and the first bridge portion (12) arranged in the display area (DA) may be spaced apart from each other with the first opening (CS1) therebetween. The first island portion (11) includes light-emitting elements (LEDs) and a circuit for driving the light-emitting elements electrically connected thereto, for example, a pixel driving circuit portion (PC), and the first bridge portion (12) may include wires electrically connected to pixel driving circuit portions (PC) arranged in each of the adjacent first island portions (11).

[0095] The display device (1) may include a substrate (100). The substrate (100) may include an island area (100-1) corresponding to the first island portion (11) and a bridge area (100-2) corresponding to the first bridge portion (12).

[0096] Looking at the first island portion (11), the first island portion (11) may include a first region (1A) and a second region (2A) outside the first region (1A). The first region (1A) may be defined as a region where a barrier layer (103), a buffer layer (111), an inorganic insulating layer (IIL), and a pixel driving circuit portion (PC) are arranged. The first region (1A) is located at the center of the first island portion (11), and the width (or area) of the first region (1A) may be smaller than the width (or area) of the first island portion (11). For example, the edge of the first region (1A) may be spaced inward from the edge of the first island portion (11). The region from the edge of the first region (1A) to the edge of the first island portion (11) may be defined as the second region (2A). The barrier layer (103), buffer layer (111), inorganic insulating layer (IIL) and pixel driving circuit (PC) may not overlap with the second region (2A).

[0097] The island region (100-1) of the substrate (100) may include a first base layer (101), a barrier layer (103), and a second base layer (105). When viewed in a plan view or in the z direction, the edge of the first island portion (11) may coincide with the edge of the island region (100-1).

[0098] Each of the first base layer (101) and the second base layer (105) may include a polymer resin such as polyethersulfone, polyarylate, polyether imide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyimide, polycarbonate, cellulose triacetate, or cellulose acetate propionate. The substrate (100) including the polymer resin may have flexible, rollable, and bendable properties.

[0099] A barrier layer (103) may be interposed between the first base layer (101) and the barrier layer (103). The barrier layer (103) may include an inorganic insulating material such as silicon oxide, nitrogen oxide, silicon oxynitride, aluminum oxide, or titanium oxide. The barrier layer (103) may be disposed in the first region (1A). The barrier layer (103) may not overlap the second region (2A).

[0100] A buffer layer (111) including an inorganic insulating material is disposed on the upper surface (the plane in the z direction) of the island region (100-1), and pixel driving circuits (PC) may be disposed on the buffer layer (111). An inorganic insulating layer (IIL) and an organic insulating layer (OIL) may be disposed between the pixel driving circuit (PC) and the light emitting element (LED). The inorganic insulating layer (IIL) may include an inorganic insulating material such as silicon oxide, nitrogen oxide, silicon oxynitride, aluminum oxide, or titanium oxide. The organic insulating layer (OIL) may include a first organic insulating layer (120), a second organic insulating layer (130), and a third organic insulating layer (140). Each of the first organic insulating layer (120), the second organic insulating layer (130), and the third organic insulating layer (140) may include an organic insulating material such as polyimide.

[0101] Light-emitting elements (LEDs) are arranged on an organic insulating layer (OIL), and each of the light-emitting elements (LEDs) can be electrically connected to a corresponding pixel driving circuit (PC) through a first connection electrode (CM1) and a second connection electrode (CM2). The first connection electrodes (CM1) can be arranged between a first organic insulating layer (120) and a second organic insulating layer (130), and the second connection electrodes (CM2) can be arranged between a second organic insulating layer (130) and a third organic insulating layer (140).

[0102] The light emitting elements (LEDs) may emit light of different colors or of the same color. In one embodiment, the light emitting elements (LEDs) may emit red, green, and blue light, respectively. In some embodiments, the light emitting elements (LEDs) may emit white light. In another embodiment, the light emitting elements (LEDs) may emit red, green, blue, and white light, respectively.

[0103] In one embodiment, FIG. 5 illustrates three pixel driver circuits (PCs) arranged in each first island portion (11) and three light-emitting elements (LEDs) connected to each pixel driver circuit portion (PC), but the present invention is not limited thereto. In another embodiment, the number of pixel driver circuits (PCs) and light-emitting elements (LEDs) arranged in the first island portion (11) may be one, two, four or more.

[0104] The encapsulation layer (300) may be disposed on a light-emitting element (LED) and may protect the light-emitting element (LED) from external force and / or moisture permeation. The encapsulation layer (300) may include an inorganic encapsulation layer and / or an organic encapsulation layer. In some embodiments, the encapsulation layer (300) may include a structure in which an inorganic encapsulation layer including an inorganic insulating material, an organic encapsulation layer including an organic insulating material, and an inorganic encapsulation layer including an inorganic insulating material are laminated. In other embodiments, the encapsulation layer (300) may include an organic material such as a resin. In some embodiments, the encapsulation layer (300) may include urethane epoxy acrylate. The encapsulation layer (300) may include a photosensitive material, for example, a material such as a photoresist.

[0105] Looking at the first bridge portion (12), the first bridge portion (12) may include a third region (3A) and a fourth region (4A) outside the third region (3A). The third region (3A) may be defined as a region where the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) are arranged. The width (or area) of the third region (3A) may be smaller than the width (or area) of the first bridge portion (12). For example, the edge of the third region (3A) may be spaced inward from the edge of the first bridge portion (12). The region from the edge of the third region (3A) to the edge of the first bridge portion (12) may be defined as the fourth region (4A). The first wiring section (WL1), the second wiring section (WL2), and the third wiring section (WL3) may not overlap with the fourth area (4A).

[0106] The bridge region (100-2) of the substrate (100) may include a first base layer (101) and a second base layer (105). In a plan view, the edge of the first bridge portion (12) may coincide with the edge of the bridge region (100-2). The first base layer (101) of the bridge region (100-2) may be a layer formed together with the first base layer (101) of the island region (100-1) in the same process. The second base layer (105) of the bridge region (100-2) may be a layer formed together with the second base layer (105) of the island region (100-1) in the same process.

[0107] The bridge region (100-2) of the substrate (100) may not include a barrier layer (103). When the display device (1) is stretched, the bridge region (100-2), which is relatively more deformed than the island region (100-1), may not have a layer including an inorganic insulating material that is prone to cracking, unlike the island region (100-1).

[0108] A fourth organic insulating layer (150) may be disposed on the upper surface (the surface in the z direction) of the bridge region (100-2). The fourth organic insulating layer (150) may include an organic insulating material such as polyimide. The upper surface of the fourth organic insulating layer (150) may be positioned at approximately the same level as the upper surface of the inorganic insulating layer (IIL). In other words, the height from the lower surface of the first base layer (101) to the upper surface of the fourth organic insulating layer (150) and the height from the lower surface of the first base layer (101) to the upper surface of the inorganic insulating layer (IIL) may be approximately the same. The fourth organic insulating layer (150) may reduce the step in the z direction of the wires extending from the first island portion (11) to the first bridge portion (12).

[0109] A first organic insulating layer (120), a second organic insulating layer (130), and a third organic insulating layer (140) may be sequentially laminated on a fourth organic insulating layer (150). Each of the first organic insulating layer (120), the second organic insulating layer (130), and the third organic insulating layer (140) of the first bridge portion (12) may be a layer formed together in the same process as the corresponding layer of the first island portion (11).

[0110] A first wiring part (WL1) may be arranged between the fourth organic insulating layer (150) and the first organic insulating layer (120), a second wiring part (WL2) may be arranged between the first organic insulating layer (120) and the second organic insulating layer (130), and a third wiring part (WL3) may be arranged between the second organic insulating layer (130) and the third organic insulating layer (140).

[0111] Each of the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) may include a low-resistance metal material. Each of the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) may include a conductive material including molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), or the like, and may be formed as a multilayer or single layer including the above materials.

[0112] Each of the first wiring unit (WL1), the second wiring unit (WL2), and the third wiring unit (WL3) may include at least one wire extending from the first island unit (11) to the first bridge unit (12). In this regard, FIG. 5 illustrates that the first wiring unit (WL1) includes three wires, and the second wiring unit (WL2) and the third wiring unit (WL3) each include one wire, but is not limited thereto. The number of wires and the thickness of the wires included in each of the first wiring unit (WL1), the second wiring unit (WL2), and the third wiring unit (WL3) may be designed in various ways as needed. The wirings included in the first wiring section (WL1), the second wiring section (WL2), and the third wiring section (WL3) may be signal lines (e.g., gate lines, data lines, etc.) for providing electrical signals to transistors included in the pixel driving circuit section (PC) of the first island section (11) or voltage lines (e.g., driving voltage lines, initialization voltage lines, etc.) for providing voltage.

[0113] A sealing layer (300) may also be arranged in the first bridge portion (12). In another embodiment, the sealing layer (300) may not be present in the first bridge portion (12).

[0114] Referring to FIGS. 4 and 5, the substrate (100) corresponding to the first island portion (11) and the substrate (100) corresponding to the first bridge portion (12) may be connected to each other. In other words, the plan view illustrated in FIG. 4 may be substantially the same as the plan view of the substrate (100) of FIG. 5. In other words, the substrate (100) may include an island region (100-1), a bridge region (100-2), and an opening (100OP1) having the same shape as the first opening (CS1). The opening (100OP1) may be defined between the island region (100-1) and the bridge region (100-2).

[0115] Similarly, the sealing layer (300) corresponding to the first island portion (11) and the sealing layer (300) corresponding to the first bridge portion (12) may be connected to each other. For example, the plan view illustrated in FIG. 4 above may be substantially the same as the plan view of the sealing layer (300). In other words, the sealing layer (300) may include an area corresponding to the first island portion (11), an area corresponding to the first bridge portion (12), and an opening (300OP1) having the same shape as the first opening portion (CS1). The opening (300OP1) may be defined between the area corresponding to the first island portion (11) and the area corresponding to the first bridge portion (12).

[0116] The circuit-light-emitting element layer (200) between the substrate (100) and the encapsulating layer (300) may include a buffer layer (111), a pixel driving circuit (PC), an inorganic insulating layer (IIL), an organic insulating layer (OIL), and a light-emitting element (LED). Similar to the substrate (100), the plan view illustrated in FIG. 4 may be substantially the same as the plan view of the circuit-light-emitting element layer (200). In other words, the circuit-light-emitting element layer (200) may include an opening (200OP1) having the same shape as the first opening (CS1).

[0117] FIGS. 6A to 6C are equivalent circuit diagrams of subpixels of a display device according to one embodiment of the present invention, respectively.

[0118] Referring to FIG. 6a, a light emitting element (LED) corresponding to a subpixel is electrically connected to a pixel driver circuit (PC), and the pixel driver circuit (PC) may include a first transistor (T1), a second transistor (T2), and a storage capacitor (Cst). The pixel driver circuit (PC) may be electrically connected to a signal line and a voltage line. The signal line may include a gate line such as a first scan line (SL1) and a data line (DL), and the voltage line may include a first voltage line (VDDL).

[0119] The second transistor (T2) can be electrically connected to the first scan line (SL1) and the data line (DL). The first scan line (SL1) can provide a first scan signal (GW1) to a gate electrode of the second transistor (T2). The second transistor (T2) can transmit a data signal (Dm) input from the data line (DL) to the first transistor (T1) according to the first scan signal (GW1) input from the first scan line (SL1).

[0120] The storage capacitor (Cst) is electrically connected to the second transistor (T2) and the first voltage line (VDDL), and can store a voltage corresponding to the difference between the voltage received from the second transistor (T2) and the first power voltage (VDD) supplied by the first voltage line (VDDL).

[0121] The first transistor (T1) is a driving transistor and can control a driving current flowing through a light-emitting element (LED). The first transistor (T1) can be connected to a first voltage line (VDDL) and a storage capacitor (Cst). The first transistor (T1) can control a driving current flowing through the light-emitting element (LED) from the first voltage line (VDDL) in response to a voltage value stored in the storage capacitor (Cst). The light-emitting element (LED) can emit light having a predetermined brightness by the driving current. A first electrode of the light-emitting element (LED) can be electrically connected to the first transistor (T1), and a second electrode can be electrically connected to a second voltage line (VSSL) that supplies a second power voltage (VSS).

[0122] Although FIG. 6a illustrates that the pixel driver circuit (PC) includes two transistors and one storage capacitor, in other embodiments, the pixel driver circuit (PC) may include three or more transistors.

[0123] Referring to FIG. 6b, the pixel driving circuit unit (PC) may include a first transistor (T1), a second transistor (T2), a third transistor (T3), a fourth transistor (T4), a fifth transistor (T5), a sixth transistor (T6), a seventh transistor (T7), and a storage capacitor (Cst).

[0124] The pixel driver circuit (PC) is electrically connected to signal lines and voltage lines. The signal lines may include gate lines such as a first scan line (SL1), a second scan line (SL2), a third scan line (SL3), a fourth scan line (SL4), and an emission control line (EML), and a data line (DL). The voltage lines may include first and second initialization voltage lines (VIL1, VIL2) and a first voltage line (VDDL).

[0125] The first voltage line (VDDL) can transmit the first power voltage (VDD) to the first transistor (T1). The first initialization voltage line (VIL1) can transmit the first initialization voltage (Vint) that initializes the first transistor (T1) to the pixel driver circuit (PC). The second initialization voltage line (VIL2) can transmit the second initialization voltage (Vaint) that initializes the first electrode of the light-emitting element (LED) to the pixel driver circuit (PC).

[0126] The first transistor (T1) may be electrically connected to the first voltage line (VDDL) via the fifth transistor (T5) and may be electrically connected to the light-emitting element (LED) via the sixth transistor (T6). The first transistor (T1) functions as a driving transistor, and receives a data signal (Dm) according to the switching operation of the second transistor (T2) to supply a driving current to the light-emitting element (LED).

[0127] The second transistor (T2) is a data writing transistor and is electrically connected to the first scan line (SL1) and the data line (DL). The second transistor (T2) is electrically connected to the first voltage line (VDDL) via the fifth transistor (T5). The second transistor (T2) is turned on in response to the first scan signal (GW) received through the first scan line (SL1) and performs a switching operation to transmit the data signal (Dm) transmitted to the data line (DL) to the first node (N1).

[0128] The third transistor (T3) is electrically connected to the first scan line (SL1) and is electrically connected to the light-emitting element (LED) via the sixth transistor (T6). The third transistor (T3) can be turned on in response to the first scan signal (GW) received through the first scan line (SL1) to diode-connect the first transistor (T1).

[0129] The fourth transistor (T4) is a first initialization transistor and is electrically connected to the third scan line (SL3) and the first initialization voltage line (VIL1). The fourth transistor (T4) is turned on according to the third scan signal (GI) received through the third scan line (SL3) and transmits the first initialization voltage (Vint) from the first initialization voltage line (VIL1) to the gate electrode of the first transistor (T1) to initialize the voltage of the gate electrode of the first transistor (T1). The third scan signal (GI) may correspond to the first scan signal of another pixel driver circuit unit arranged in the previous row of the corresponding pixel driver circuit unit (PC).

[0130] The fifth transistor (T5) may be a motion control transistor, and the sixth transistor (T6) may be a light emission control transistor. The fifth transistor (T5) and the sixth transistor (T6) are electrically connected to the light emission control line (EML), and are turned on simultaneously according to the light emission control signal (EM) transmitted through the light emission control line (EML), thereby forming a current path so that a driving current can flow from the first voltage line (VDDL) in the direction of the light emitting element (LED).

[0131] The seventh transistor (T7) is a second initialization transistor and can be electrically connected to the second scan line (SL2), the second initialization voltage line (VIL2), and the sixth transistor (T6). The seventh transistor (T7) is turned on according to the second scan signal (GB) transmitted through the second scan line (SL2), and can transmit the second initialization voltage (Vaint) from the second initialization voltage line (VIL2) to the first electrode of the light-emitting element (LED) to initialize the first electrode of the light-emitting element (LED).

[0132] A storage capacitor (Cst) includes a first electrode (CE1) and a second electrode (CE2). The first electrode (CE1) is electrically connected to the gate electrode of the first transistor (T1), and the second electrode (CE2) is electrically connected to the first voltage line (VDDL). The storage capacitor (Cst) can maintain a voltage applied to the gate electrode of the first transistor (T1) by storing and maintaining a voltage corresponding to a voltage difference between the first voltage line (VDDL) and the gate electrode of the first transistor (T1).

[0133] Referring to FIG. 6c, the pixel driving circuit unit (PC) may include a first transistor (T1), a second transistor (T2), a third transistor (T3), a fourth transistor (T4), a fifth transistor (T5), a sixth transistor (T6), a seventh transistor (T7), an eighth transistor (T8), a ninth transistor (T9), a storage capacitor (Cst), and an auxiliary capacitor (Ca).

[0134] The pixel driver circuit (PC) is electrically connected to signal lines and voltage lines. The signal lines may include gate lines such as a first scan line (SL1), a second scan line (SL2), a third scan line (SL3), a fourth scan line (SL4), and an emission control line (EML), and a data line (DL). The voltage lines may include first and second initialization voltage lines (VIL1, VIL2), a sustain voltage line (VSL), and a first voltage line (VDDL).

[0135] The first voltage line (VDDL) can transmit a first power voltage (VDD) to the first transistor (T1). The first initialization voltage line (VIL1) can transmit a first initialization voltage (Vint) for initializing the first transistor (T1) to the pixel driver circuit (PC). The second initialization voltage line (VIL2) can transmit a second initialization voltage (Vaint) for initializing the first electrode of the light-emitting element (LED) to the pixel driver circuit (PC). The sustain voltage line (VSL) can provide a sustain voltage (VSUS) to the second node (N2), for example, the second electrode (CE2) of the storage capacitor (Cst), during the initialization period and the data writing period.

[0136] The first transistor (T1) may be electrically connected to the first voltage line (VDDL) via the fifth transistor (T5) and the eighth transistor (T8), and may be electrically connected to the light-emitting element (LED) via the sixth transistor (T6). The first transistor (T1) functions as a driving transistor, and may receive a data signal (Dm) according to the switching operation of the second transistor (T2) to supply a driving current to the light-emitting element (LED).

[0137] The second transistor (T2) is electrically connected to the first scan line (SL1) and the data line (DL), and is electrically connected to the first voltage line (VDDL) via the fifth transistor (T5) and the eighth transistor (T8). The second transistor (T2) is turned on in response to the first scan signal (GW) received through the first scan line (SL1) and performs a switching operation to transmit the data signal (Dm) transmitted to the data line (DL) to the first node (N1).

[0138] The third transistor (T3) is electrically connected to the first scan line (SL1) and is electrically connected to the light-emitting element (LED) via the sixth transistor (T6). The third transistor (T3) is turned on in response to the first scan signal (GW) received through the first scan line (SL1), thereby diode-connecting the first transistor (T1), thereby compensating for the threshold voltage of the first transistor (T1).

[0139] The fourth transistor (T4) is electrically connected to the third scan line (SL3) and the first initialization voltage line (VIL1), and is turned on in response to the third scan signal (GI) transmitted through the third scan line (SL3) to transmit the first initialization voltage (Vint) from the first initialization voltage line (VIL1) to the gate electrode of the first transistor (T1) to initialize the voltage of the gate electrode of the first transistor (T1). The third scan signal (GI) may correspond to the first scan signal of another pixel driving circuit unit arranged in the previous row of the corresponding pixel driving circuit unit (PC).

[0140] The fifth transistor (T5), the sixth transistor (T6), and the eighth transistor (T8) are electrically connected to the light emission control line (EML), and are simultaneously turned on in response to the light emission control signal (EM) transmitted through the light emission control line (EML), thereby forming a current path so that a driving current can flow from the first voltage line (VDDL) in the direction of the light emitting element (LED).

[0141] The seventh transistor (T7) is a second initialization transistor and can be electrically connected to the second scan line (SL2), the second initialization voltage line (VIL2), and the sixth transistor (T6). The seventh transistor (T7) is turned on in response to the second scan signal (GB) received through the second scan line (SL2) and transmits the second initialization voltage (Vaint) from the second initialization voltage line (VIL2) to the first electrode of the light-emitting element (LED) to initialize the first electrode of the light-emitting element (LED).

[0142] The ninth transistor (T9) can be electrically connected to the second scan line (SL2), the second electrode (CE2) of the storage capacitor (Cst), and the sustain voltage line (VSL). The ninth transistor (T9) is turned on according to the second scan signal (GB) transmitted through the second scan line (SL2), and can transmit the sustain voltage (VSUS) to the second node (N2), for example, the second electrode (CE2) of the storage capacitor (Cst), during the initialization section and the data writing section.

[0143] The eighth transistor (T8) and the ninth transistor (T9) may be electrically connected to a second node (N2), for example, a second electrode (CE2) of a storage capacitor (Cst), respectively. In some embodiments, the eighth transistor (T8) may be turned off and the ninth transistor (T9) may be turned on in an initialization period and a data writing period, and the eighth transistor (T8) may be turned on and the ninth transistor (T9) may be turned off in an emission period. Since the sustain voltage (VSUS) is transmitted to the second node (N2) in the initialization period and the data writing period, the uniformity of the luminance (e.g., LRU, Long Range Uniformity) of the display device, which may be reduced by a voltage drop of the first voltage line (VDDL), may be improved.

[0144] The storage capacitor (Cst) includes a first electrode (CE1) and a second electrode (CE2). The first electrode (CE1) is electrically connected to the gate electrode of the first transistor (T1), and the second electrode (CE2) is electrically connected to the eighth transistor (T8) and the ninth transistor (T9).

[0145] The auxiliary capacitor (Ca) can be electrically connected to the sixth transistor (T6), the sustain voltage line (VSL), and the first electrode of the light-emitting element (LED). The auxiliary capacitor (Ca) stores and maintains a voltage corresponding to the voltage difference between the first electrode of the light-emitting element (LED) and the sustain voltage line (VSL) while the seventh transistor (T7) and the ninth transistor (T9) are turned on, thereby preventing the problem of the black luminance increasing when the sixth transistor (T6) is turned off.

[0146] FIG. 7a and FIG. 7b are cross-sectional views schematically showing a light-emitting element of a display device according to one embodiment of the present invention, respectively.

[0147] Referring to FIG. 7A, a light-emitting element according to one embodiment of the present invention may include an organic light-emitting diode (220) including an organic material. The organic light-emitting diode (220) may include a first electrode (221) disposed on an insulating layer, a second electrode (225) facing the first electrode (221), and a light-emitting layer (223) interposed between the first electrode (221) and the second electrode (225). A first functional layer (222) may be disposed between the first electrode (221) and the light-emitting layer (223), and a second functional layer (224) may be disposed between the light-emitting layer (223) and the second electrode (225).

[0148] The edge of the first electrode (221) may be covered with a bank layer (BKL) including an insulating material. The bank layer (BKL) may define an opening (B-OP) overlapping the central portion of the first electrode (221).

[0149] The first electrode (221) may include a conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO), or aluminum zinc oxide (AZO). In another embodiment, the first electrode (221) may include a reflective layer including silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), or a compound thereof. In another embodiment, the first electrode (221) may further include a layer formed of ITO, IZO, ZnO, AZO, or In2O3 on / under the aforementioned reflective layer.

[0150] The light-emitting layer (223) may include a polymer or low-molecular organic material that emits light of a predetermined color. The first functional layer (222) may include a hole transport layer (HTL) and / or a hole injection layer (HIL). The second functional layer (224) may include an electron transport layer (ETL) and / or an electron injection layer (EIL).

[0151] The second electrode (225) may be formed of a conductive material having a low work function. For example, the second electrode (225) may include a (semi-)transparent layer including silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), or an alloy thereof. Alternatively, the second electrode (225) may further include a layer such as ITO, IZO, ZnO, AZO, or In2O3 on the (semi-)transparent layer including the aforementioned material.

[0152] FIG. 7b is a cross-sectional view schematically showing a light-emitting element of a display device according to one embodiment of the present invention.

[0153] Referring to FIG. 7b, in one embodiment of the present invention, a light-emitting element may include an inorganic light-emitting diode (230) including an inorganic material. The inorganic light-emitting diode (230) may include a first semiconductor layer (231), a second semiconductor layer (232), an intermediate layer (233) between the first semiconductor layer (231) and the second semiconductor layer (232), a first electrode (235) electrically connected to the first semiconductor layer (231), and a second electrode (238) electrically connected to the second semiconductor layer (232). The first electrode (235) and the second electrode (238) of the inorganic light-emitting diode (230) may be electrically connected to a first electrode pad (241) and a second electrode pad (242), respectively. The first electrode pad (241) and the second electrode pad (242) can be placed on the same layer.

[0154] In some embodiments, the first semiconductor layer (231) may include a p-type semiconductor layer. The p-type semiconductor layer may be In x Al y Ga 1-x-y A semiconductor material having a composition formula of N (0≤x≤1, 0≤y≤1, 0≤x+y≤1) can be selected from among, for example, GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, etc., and a p-type dopant such as Mg, Zn, Ca, Sr, Ba, etc. can be doped.

[0155] The second semiconductor layer (232) may include, for example, an n-type semiconductor layer. The n-type semiconductor layer may be In x Al y Ga 1-x-y A semiconductor material having a composition formula of N (0≤x≤1, 0≤y≤1, 0≤x+y≤1) can be selected from among, for example, GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, etc., and an n-type dopant such as Si, Ge, or Sn can be doped.

[0156] The intermediate layer (233) is a region where electrons and holes recombine, and as electrons and holes recombine, they transition to a lower energy level and can generate light with a corresponding wavelength. The intermediate layer (233) is, for example, In x Al y Ga 1-x-y It can be formed by including a semiconductor material having a composition formula of N (0≤x≤1, 0≤y≤1, 0≤x+y≤1), and can be formed as a single quantum well structure or a multi-quantum well structure (MQW: Multi Quantum Well). In addition, it can also include a quantum wire structure or a quantum dot structure.

[0157] Although Fig. 7b illustrates that the first semiconductor layer (231) includes a p-type semiconductor layer and the second semiconductor layer (232) includes an n-type semiconductor layer, the present invention is not limited thereto. In another embodiment, the first semiconductor layer (231) may include an n-type semiconductor layer and the second semiconductor layer (232) may include a p-type semiconductor layer.

[0158] Fig. 8 is a plan view showing an excerpt of one first bridge unit (12) included in a display device according to one embodiment of the present invention, and Figs. 9a to 9d are cross-sectional views schematically illustrating a cross-section of one first bridge unit (12) included in a display device according to one embodiment of the present invention, respectively. Figs. 9a to 9c are cross-sectional views taken along line Ⅰ-Ⅰ' of Fig. 8, and Fig. 9d is a cross-sectional view taken along line Ⅱ-Ⅱ' of Fig. 8.

[0159] Referring to FIGS. 8 and 9a to 9d, the first bridge portion (12) may have a winding shape (e.g., approximately an "S" shape or a shape similar to an "S"). The first bridge portion (12) may be placed in a gap between two adjacent first island portions (11, see FIG. 4).

[0160] The first bridge portion (12) may include a first round portion (RP1), a second round portion (RP2), and a straight portion (SP) between the first round portion (RP1) and the second round portion (RP2). The width of the first round portion (RP1), the width of the second round portion (RP2), and the width of the straight portion (SP) may be substantially the same.

[0161] The first round portion (RP1) and the second round portion (RP2) have an approximately circular arc shape (arc type) and can be connected to the edge of the first island portion, respectively. The straight portion (SP) can have an approximately straight shape (straight type) extending in a first direction (e.g., x direction or -x direction) and a second direction (e.g., y direction or -y direction) and an oblique fourth direction (DR4). One end of the straight portion (SP) can be connected to the first round portion (RP1), and the other end of the straight portion (SP) can be connected to the second round portion (RP2).

[0162] Each of the first round portion (RP1) and the second round portion (RP2) may have an inner edge (RIE) and an outer edge (ROE). The inner edge (RIE) may extend along an arc of an imaginary circle having a first radius. The outer edge (ROE) may extend along an arc of an imaginary circle having a second radius greater than the first radius. One end of the inner edge (RIE) may be connected to an edge of the first island portion (11), and the other end of the inner edge (RIE) may be connected to one edge of the straight portion (SP). One end of the outer edge (ROE) may be connected to an edge of the first island portion (11), and the other end of the outer edge (ROE) may be connected to the other edge of the straight portion (SP).

[0163] The first bridge portion (12) may include a fourth organic insulating layer (150), a first organic insulating layer (120), a second organic insulating layer (130), and a third organic insulating layer (140) sequentially laminated on a substrate (100) corresponding to the first bridge portion (12). The first wiring portion (WL1) may include at least one wiring disposed between the fourth organic insulating layer (150) and the first organic insulating layer (120), the second wiring portion (WL2) may include at least one wiring disposed between the first organic insulating layer (120) and the second organic insulating layer (130), and the third wiring portion (WL3) may include at least one wiring disposed between the second organic insulating layer (130) and the third organic insulating layer (140). FIGS. 8 and 9a to 9c illustrate that the first wiring portion (WL1) includes three wiring portions, and the second wiring portion (WL2) and the third wiring portion (WL3) each include one wiring portion, but are not limited thereto. For example, among the first bridge portions (12), the first bridge portions (12) that connect adjacent first island portions in a first direction (e.g., the x direction or the -x direction) and the first bridge portions (12) that connect adjacent first island portions in a second direction (e.g., the y direction or the -y direction) may have different wiring configurations.

[0164] The third region (3A) is defined as the region where the first wiring section (WL1), the second wiring section (WL2), and the third wiring section (WL3) are arranged, and the fourth regions (4A) can be defined as regions between the facing edges of the third region (3A) and the first bridge section (12). For example, two fourth regions (4A) can be arranged with the third region (3A) in between.

[0165] The width (or area) of the third region (3A) may be smaller than the width (or area) of the first bridge portion (12). The third region (3A) may be arranged closer to the outer edge (ROE) of the first round portion (RP1) and the second round portion (RP2). For example, in a direction perpendicular to the extension direction of the first bridge portion (12), the third region (3A) may be spaced apart from the inner edge (RIE) by a first distance and spaced apart from the outer edge (ROE) by a second distance that is smaller than the first distance.

[0166] When the first bridge portion (12) is contracted or stretched by an external force, the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2) may be subjected to greater stress than the outer edge (ROE). Therefore, by arranging the third region (3A) closer to the outer edge (ROE) of the first round portion (RP1) and the second round portion (RP2), the occurrence of cracks or the like in the wires of the wire portion can be reduced or prevented.

[0167] In the fourth region (4A) of the first bridge portion (12), first groove patterns (GP) open in the -z direction may be arranged along one edge of the first bridge portion (12). Fig. 8 illustrates that the first groove patterns (GP) are arranged along the inner edge (RIE) and a portion of the edge extending from the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2). Here, the edge extending from the inner edge (RIE) may mean a portion extending from one end of the inner edge (RIE) and connected to the edge of the first island portion (11, see Fig. 4), and an edge of a straight portion (SP) extending from the other end of the inner edge (RIE). In one embodiment, the first groove patterns (GP) may not be arranged on the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2). In one embodiment, the first groove patterns (GP) may be arranged only on the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2).

[0168] In one embodiment, the first groove pattern (GP) on the plan view may have a rectangular shape that is in contact with the inner edge (RIE) of the first round portion (RP1) or the inner edge (RIE) of the second round portion (RP2). In other embodiments, the first groove pattern (GP) on the plan view may have various shapes, such as a polygonal shape, a semicircular shape, or an irregular shape.

[0169] The first groove patterns (GP) can be formed (or defined) on the lower surface (the surface in the -z direction) of the first bridge portion (12). Since the lower surface (the surface in the -z direction) of the first bridge portion (12) is the lower surface (the surface in the -z direction) of the substrate (100) corresponding to the first bridge portion (12), the first groove patterns (GP) can be formed on the lower surface (the surface in the -z direction) of the substrate (100).

[0170] The substrate (100) corresponding to the first bridge portion (12) may have a multilayer structure including a first base layer (101) and a second base layer (105). In one embodiment, as illustrated in FIGS. 9A and 9B, the first groove patterns (GP) may be defined by the first base layer (101). For example, the first groove patterns (GP) may be defined by openings defined to penetrate the first base layer (101). The edge of the first base layer (101) may have a zigzag unevenness in a plan view (e.g., when viewed in a direction perpendicular to the substrate or when viewed in the z-direction).

[0171] In another embodiment, as illustrated in FIG. 9C, the first groove patterns (GP) may be defined by the first base layer (101) and the second base layer (105). For example, the first groove patterns (GP) may be defined by openings defined to penetrate the first base layer (101) and the second base layer (105). The edge of the first base layer (101) and the edge of the second base layer (105) overlap in a plan view and may have a zigzag unevenness. The first groove patterns (GP) formed on the substrate (100) corresponding to the first bridge portion (12) may disperse stress concentrated on a portion of the first bridge portion (12) when the first bridge portion (12) is elongated or contracted.

[0172] The first groove patterns (GP) may have a third width (wp) in a direction perpendicular to the extension direction of the first bridge portion (12). In one embodiment, as illustrated in FIGS. 8 and 9A, the third width (wp) of the first groove pattern (GP) may be smaller than or substantially equal to the first width (w1) of the corresponding fourth region (4A). In a plan view, the first groove patterns (GP) may overlap the fourth region (4A) and may not overlap the third region (3A). In another embodiment, as illustrated in FIG. 9B, the third width (wp) of the first groove pattern (GP) may be larger than the first width (w1) of the corresponding fourth region (4A). In this case, in a plan view, the first groove patterns (GP) may overlap the third region (3A) and the fourth region (4A) on the inner edge (RIE) side.

[0173] Although FIG. 9b illustrates that the first groove patterns (GP) are defined by the first base layer (101), as described with reference to FIG. 9c, the first groove patterns (GP) may be defined by the first base layer (101) and the second base layer (105). Similarly, the first groove patterns (GP) included in the embodiments described later in this specification may be defined by the first base layer (101) or by the first base layer (101) and the second base layer (105).

[0174] In one embodiment, as illustrated in FIGS. 8 and 9d, each of the first groove patterns (GP) may have substantially the same width (or length) in the extension direction of the first bridge portion (12). The first groove patterns (GP) may be arranged at substantially the same interval (or a constant interval). For example, each of the first groove patterns (GP) may have a first length (l1) in the extension direction of the first bridge portion (12), and the first groove patterns (GP) may be arranged to be spaced apart from each other by a first distance (d1) in the extension direction of the first bridge portion (12).

[0175] FIG. 10a is a plan view showing an excerpt of one first bridge part included in a display device according to one embodiment of the present invention, and FIG. 10b is a cross-sectional view showing a cross-section along line Ⅲ-Ⅲ' of the first bridge part shown in FIG. 10a.

[0176] Referring to FIGS. 10A and 10B, the first bridge portion (12) may include a first round portion (RP1), a second round portion (RP2), and a straight portion (SP) between the first round portion (RP1) and the second round portion (RP2). The width of the first round portion (RP1), the width of the second round portion (RP2), and the width of the straight portion (SP) may be substantially the same.

[0177] The first round portion (RP1) and the second round portion (RP2) have an approximately circular arc shape (arc type) and can be connected to the edge of the first island portion, respectively. The straight portion (SP) can have an approximately straight shape (straight type) extending in a first direction (e.g., x direction or -x direction) and a second direction (e.g., y direction or -y direction) and an oblique fourth direction (DR4). One end of the straight portion (SP) can be connected to the first round portion (RP1), and the other end of the straight portion (SP) can be connected to the second round portion (RP2).

[0178] Each of the first round portion (RP1) and the second round portion (RP2) may have an inner edge (RIE) and an outer edge (ROE). The inner edge (RIE) may extend along an arc of an imaginary circle having a first radius. The outer edge (ROE) may extend along an arc of an imaginary circle having a second radius greater than the first radius.

[0179] The first bridge portion (12) may include a third region (3A) and fourth regions (4A) arranged on opposite sides of the third region (3A). The third region (3A) may be defined as a region where the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) are arranged, and the fourth regions (4A) may be defined as regions between the third region (3A) and opposite edges of the first bridge portion (12).

[0180] In the fourth region (4A) of the first bridge portion (12), first groove patterns (GP) open in the -z direction may be arranged along one edge of the first bridge portion (12). FIG. 10A illustrates that the first groove patterns (GP) are arranged along the inner edge (RIE) and a portion of the edge extending from the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2). Here, the edge extending from the inner edge (RIE) may mean a portion extending from one end of the inner edge (RIE) and connected to the edge of the first island portion (11, see FIG. 4), and a portion of the edge of the straight portion (SP) extending from the other end of the inner edge (RIE). In one embodiment, the first groove patterns (GP) may not be arranged on the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2).

[0181] The first groove patterns (GPs) may be formed (or defined) on the lower surface (the surface in the -z direction) of the first bridge portion (12). In other words, the first groove patterns (GPs) may be formed on the lower surface (the surface in the -z direction) of the substrate (100). The substrate (100) may have a multilayer structure including a first base layer (101) and a second base layer (105). In one embodiment, as illustrated in FIG. 10b, the first groove patterns (GPs) may be formed on the first base layer (101). In another embodiment, they may be formed on the first base layer (101) and the second base layer (105).

[0182] In one embodiment, the width of the first groove patterns (GP) in a direction perpendicular to the extension direction of the first bridge portion (12) may be smaller than or substantially equal to the width of the corresponding fourth region (4A). In this case, the first groove patterns (GP) may overlap with the fourth region (4A) and may not overlap with the third region (3A).

[0183] In another embodiment, the width of the first groove patterns (GP) in the vertical direction in the extension direction of the first bridge portion (12) may be greater than the width of the corresponding fourth region (4A). In this case, the first groove patterns (GP) may overlap the third region (3A) and the fourth region (4A).

[0184] The first groove patterns (GP) may be arranged at different intervals depending on the location. The first groove patterns (GP) may be arranged more densely at the inner edge (RIE) of the first round portion (RP1) and the inner edge (RIE) of the second round portion (RP2), where stress is concentrated when the first bridge portion (12) contracts or elongates. In one embodiment, as illustrated in FIG. 10b, the first groove patterns (GP) adjacent to each other in the first round portion (RP1) may be arranged to be spaced apart from each other by a first distance (d1) in the extension direction of the first bridge portion (12), and the first groove patterns (GP) adjacent to each other in the straight portion (SP) may be arranged to be spaced apart from each other by a second distance (d2) in the extension direction of the first bridge portion (12). In this case, the first distance (d1) may be smaller than the second distance (d2).

[0185] FIG. 11a is a plan view showing an excerpt of one first bridge portion (12) included in a display device according to one embodiment of the present invention, and FIG. 11b is a cross-sectional view showing a cross-section along line Ⅳ-Ⅳ' of the first bridge portion (12) shown in FIG. 11a.

[0186] Referring to FIGS. 11a and 11b, the first bridge portion (12) may include a first round portion (RP1), a second round portion (RP2), and a straight portion (SP) between the first round portion (RP1) and the second round portion (RP2). Each of the first round portion (RP1) and the second round portion (RP2) may have an inner edge (RIE) and an outer edge (ROE).

[0187] The first bridge portion (12) may include a third region (3A) and fourth regions (4A) arranged on opposite sides of the third region (3A). The third region (3A) may be defined as a region where the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) are arranged, and the fourth regions (4A) may be defined as regions between the third region (3A) and opposite edges of the first bridge portion (12).

[0188] In the fourth region (4A) of the first bridge portion (12), first groove patterns (GP) open in the -z direction may be arranged along one edge of the first bridge portion (12). FIG. 11A illustrates that the first groove patterns (GP) are arranged along the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2) and the edges of the first bridge portion (12) extending from the inner edge (RIE). In one embodiment, the first groove patterns (GP) may not be arranged on the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2).

[0189] The first groove patterns (GPs) may be formed (or defined) on the lower surface (the surface in the -z direction) of the first bridge portion (12). The first groove patterns (GPs) may be formed on the lower surface (the surface in the -z direction) of the substrate (100). The substrate (100) may have a multilayer structure including a first base layer (101) and a second base layer (105). In one embodiment, as illustrated in FIG. 11B, the first groove patterns (GPs) may be formed on the first base layer (101). In another embodiment, they may be formed on the first base layer (101) and the second base layer (105).

[0190] The first groove patterns (GP) may have different lengths (or widths) in the extension direction of the first bridge portion (12) depending on their locations. The first groove patterns (GP) may be formed longer at the inner edge (RIE) of the first round portion (RP1) and the inner edge (RIE) of the second round portion (RP2), where stress is concentrated when the first bridge portion (12) contracts or elongates. In one embodiment, as illustrated in FIG. 11b, the first groove patterns (GP) in the first round portion (RP1) may have a first length (l1) in the extension direction of the first bridge portion (12). The first groove patterns (GP) in the straight portion (SP) may have a second length (l2) in the extension direction of the first bridge portion (12). The first length (l1) may be longer than the second length (l2). In one embodiment, the length of the first groove pattern (GP) may become shorter as it gets farther away from the first round portion (RP1) and the second round portion (RP2). For example, the first groove pattern (GP) disposed on the straight portion (SP) and relatively close to the first round portion (RP1) may have a second length (l2) in the extension direction of the first bridge portion (12). The first groove pattern (GP) disposed on the straight portion (SP) and relatively farther away from the first round portion (RP1) may have a third length (l3) in the extension direction of the first bridge portion (12). The second length (l2) may be longer than the third length (l3).

[0191] FIG. 12a is a plan view showing an excerpt of one first bridge portion (12) included in a display device according to one embodiment of the present invention, and FIG. 12b is a cross-sectional view showing a cross-section along line V-V' of the first bridge portion (12) shown in FIG. 12a.

[0192] Referring to FIGS. 12a and 12b, the first bridge portion (12) may include a first round portion (RP1), a second round portion (RP2), and a straight portion (SP) between the first round portion (RP1) and the second round portion (RP2). Each of the first round portion (RP1) and the second round portion (RP2) may have an inner edge (RIE) and an outer edge (ROE).

[0193] The first bridge portion (12) may include a third region (3A) and fourth regions (4A) arranged on opposite sides of the third region (3A). The third region (3A) may be defined as a region where the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) are arranged, and the fourth regions (4A) may be defined as regions between the opposite edges of the third region (3A) and the first bridge portion (12).

[0194] In the fourth region (4A) of the first bridge portion (12), first groove patterns (GP) open in the -z direction may be arranged along one edge of the first bridge portion (12). FIGS. 12A and 12B illustrate that the first groove patterns (GP) are arranged along the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2). In one embodiment, the first groove patterns (GP) may not be arranged on the inner edge (RIE) and the edges of the straight portion (SP) of each of the first round portion (RP1) and the second round portion (RP2).

[0195] The first groove patterns (GP) can be formed (or defined) on the lower surface (the surface in the -z direction) of the first bridge portion (12). In other words, the first groove patterns (GP) can be formed on the lower surface (the surface in the -z direction) of the substrate (100).

[0196] The first groove patterns (GP) may have a third width (wp) in a direction perpendicular to the extension direction of the first bridge portion (12). In one embodiment, as illustrated in FIG. 12b, the third width (wp) of the first groove pattern (GP) may be larger than the second width (w2) of the overlapping fourth region (4A). In a plan view, the first groove patterns (GP) may overlap the third region (3A) and the fourth region (4A) on the outer edge (ROE) side. In another embodiment, the third width (wp) of the first groove pattern (GP) may be smaller than or substantially equal to the second width (w2) of the overlapping fourth region (4A). In this case, in a plan view, the first groove patterns (GP) may overlap the fourth region (4A) on the outer edge (ROE) side and may not overlap the third region (3A).

[0197] In one embodiment, the first groove patterns (GP) may be arranged at substantially equal intervals from each other. In another embodiment, the first groove patterns (GP) may be arranged at different intervals depending on their positions.

[0198] In one embodiment, the first groove patterns (GP) may have different lengths (or widths) in the extension direction of the first bridge portion (12) depending on their positions.

[0199] FIG. 13a is a plan view showing an excerpt of one first bridge portion (12) included in a display device according to one embodiment of the present invention, and FIG. 13b is a cross-sectional view showing a cross-section along line Ⅵ-Ⅵ' of the first bridge portion (12) shown in FIG. 13a.

[0200] Referring to FIGS. 13a and 13b, the first bridge portion (12) may include a first round portion (RP1), a second round portion (RP2), and a straight portion (SP) between the first round portion (RP1) and the second round portion (RP2). Each of the first round portion (RP1) and the second round portion (RP2) may have an inner edge (RIE) and an outer edge (ROE).

[0201] The first bridge portion (12) may include a third region (3A) and fourth regions (4A) arranged on opposite sides of the third region (3A). The third region (3A) may be defined as a region where the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) are arranged, and the fourth regions (4A) may be defined as regions between the third region (3A) and opposite edges of the first bridge portion (12).

[0202] In the fourth region (4A) of the first bridge portion (12), first groove patterns (GP) open in the -z direction may be arranged along both facing edges of the first bridge portion (12). FIGS. 13A and 13B illustrate that the first groove patterns (GP) are arranged along the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2), and the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2). The first groove patterns (GP) may further be arranged along a portion of the edge extending from the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2).

[0203] The first groove patterns (GP) can be formed (or defined) on the lower surface (the surface in the -z direction) of the first bridge portion (12). In other words, the first groove patterns (GP) can be formed on the lower surface (the surface in the -z direction) of the substrate (100).

[0204] In one embodiment, the width of the first groove patterns (GP) in a direction perpendicular to the extension direction of the first bridge portion (12) may be substantially equal to or smaller than the width of the overlapping fourth region (4A). In this case, the first groove patterns (GP) may not overlap the third region (3A). In another embodiment, the width of the first groove patterns (GP) in a direction perpendicular to the extension direction of the first bridge portion (12) may be larger than the width of the overlapping fourth region (4A). In this case, the first groove patterns (GP) may overlap the third region (3A) and the fourth region (4A). In another embodiment, as illustrated in FIGS. 13A and 13B , the width of the first groove patterns (GP) arranged along the inner edge (RIE) may be substantially equal to or smaller than the width of the overlapping fourth region (4A), and the width of the first groove patterns (GP) arranged along the outer edge (ROE) may be larger than the width of the overlapping fourth region (4A). In this case, the first groove patterns (GP) arranged along the inner edge (RIE) overlap only the fourth region (4A), but the first groove patterns (GP) arranged along the outer edge (ROE) may overlap the third region (3A) and the fourth region (4A).

[0205] FIG. 14 is a plan view showing an excerpt of one first bridge unit included in a display device according to one embodiment of the present invention.

[0206] Referring to Fig. 14, the first bridge portion (12) may include a first round portion (RP1), a second round portion (RP2), and a straight portion (SP) between the first round portion (RP1) and the second round portion (RP2). Each of the first round portion (RP1) and the second round portion (RP2) may have an inner edge (RIE) and an outer edge (ROE).

[0207] The first bridge portion (12) may include a third region (3A) and fourth regions (4A) arranged on opposite sides of the third region (3A). The third region (3A) may be defined as a region where the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) are arranged, and the fourth regions (4A) may be defined as regions between the third region (3A) and opposite edges of the first bridge portion (12).

[0208] In the fourth region (4A) of the first bridge portion (12), first groove patterns (GP) that are in contact with the edge of the first bridge portion (12) and open in the -z direction can be arranged. The first groove patterns (GP) can be arranged along the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2), and the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2). The first groove patterns (GP) can further be arranged along a portion of the edge extending from the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2). At this time, the first groove patterns (GP) arranged along the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2) and the first groove patterns (GP) arranged along the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2) may be arranged in an alternating manner. For example, the first groove patterns (GP) arranged along the inner edge (RIE) of each of the first round portion (RP1) and the second round portion (RP2) and the first groove patterns (GP) arranged along the outer edge (ROE) of each of the first round portion (RP1) and the second round portion (RP2) may be arranged in an alternating manner so as not to be aligned in the width direction, for example, in a direction perpendicular to the extension direction.

[0209] FIG. 15a is a plan view showing an excerpt of one first bridge portion (12) included in a display device according to one embodiment of the present invention, and FIG. 15b is a cross-sectional view showing a cross-section along line VII-VIII' of the first bridge portion shown in FIG. 15a.

[0210] Referring to FIGS. 15a and 15b, the first bridge portion (12) may include a first round portion (RP1), a second round portion (RP2), and a straight portion (SP) between the first round portion (RP1) and the second round portion (RP2). Each of the first round portion (RP1) and the second round portion (RP2) may have an inner edge (RIE) and an outer edge (ROE).

[0211] The first bridge portion (12) may include a third region (3A) and fourth regions (4A) arranged on opposite sides of the third region (3A). The third region (3A) may be defined as a region where the first wiring portion (WL1), the second wiring portion (WL2), and the third wiring portion (WL3) are arranged, and the fourth regions (4A) may be defined as regions between the third region (3A) and opposite edges of the first bridge portion (12).

[0212] The first bridge portion (12) may be in contact with the opposite edges of the first bridge portion (12), and first groove patterns (GP) open in the -z direction may be arranged. In other words, the first groove pattern (GP) may extend from one edge of the first bridge portion (12) across the fourth region (4A), the third region (3A), and the fourth region (4A) to the other edge of the first bridge portion (12). In a direction perpendicular to the extension direction of the first bridge portion (12), the width of the first groove patterns (GP) may be the same as the width of the first bridge portion (12).

[0213] The substrate (100) corresponding to the first bridge portion (12) may have a multilayer structure including a first base layer (101) and a second base layer (105). In one embodiment, as illustrated in FIG. 15b, the first groove patterns (GP) may be formed (or defined) only in the first base layer (101). In another embodiment, the first groove patterns (GP) may be formed (or defined) in the first base layer (101) and the second base layer (105).

[0214] FIGS. 16A to 16C are plan views schematically illustrating a portion of one first bridge unit (12) included in a display device according to one embodiment of the present invention.

[0215] Referring to FIGS. 16a to 16c, first groove patterns (GP) that are in contact with the edge of the first bridge portion (12) and open in the -z direction may be arranged in the first bridge portion (12). The first groove patterns (GP) may be formed on the lower surface (the surface in the -z direction) of the first bridge portion (12). The first groove patterns (GP) may be formed (or defined) on the lower surface (the surface in the -z direction) of the substrate (100, see FIG. 5) corresponding to the first bridge portion (12).

[0216] On the plan view, the first groove pattern (GP) may have various shapes, such as a polygonal shape, a semicircular shape, and an irregular shape. In one embodiment, as illustrated in FIG. 16a, the first groove pattern (GP) may have a shape in which the width (or length) in the extension direction of the first bridge portion (12) becomes wider as it approaches the edge of the first bridge portion (12). The edge of the first groove pattern (GP) may have a major axis in a direction perpendicular to the extension direction of the first bridge portion (12) and may be rounded along an arc of an imaginary ellipse whose center is located outside the edge of the first bridge portion (12). Since the width (or length) of each of the first bridge portions (12) in the extension direction of the first groove patterns (GP) becomes wider as it approaches the inner edge (RIE) of the first round portion (RP1), the first bridge portion (12) may be easily deformed. In addition, since the edge of the first groove pattern (GP) has a rounded shape, stability can be improved when the first bridge portion (12) is deformed.

[0217] In another embodiment, as illustrated in FIG. 16b, the first groove pattern (GP) may have a shape in which the width (or length) in the extension direction of the first bridge portion (12) becomes narrower as it approaches the edge of the first bridge portion (12). The edge of the first groove pattern (GP) may have a major axis in a direction perpendicular to the extension direction of the first bridge portion (12) and may be rounded along an arc of an imaginary ellipse whose center is located inside the edge of the first bridge portion (12). Since the width (or length) of each of the first bridge portions (12) in the extension direction of the first groove pattern (GP) becomes narrower as it approaches the inner edge (RIE) of the first round portion (RP1), the first bridge portion (12) can be easily elongated.

[0218] In another embodiment, as illustrated in FIG. 16c, the first groove pattern (GP) may have a semicircular shape whose length (or width) in the extension direction of the first bridge portion (12) becomes wider as it approaches the edge of the first bridge portion (12). At this time, the edges of neighboring first groove patterns (GP) may be smoothly connected to have a winding shape. For example, the edges of the first groove patterns (GP) may be connected to each other to have approximately the shape of the 'letter S'. In this case, when the first bridge portion (12) shrinks or elongates, the first bridge portion (12) may not only be deformed in the first direction (e.g., the x direction or the -x direction) and the second direction (e.g., the y direction or the -y direction), but may also be deformed and twisted in the third direction (e.g., the z direction or the -z direction) by the first groove patterns (GP).

[0219] Although FIGS. 16A to 16C illustrate that the first groove patterns (GP) are arranged along the inner edge (RIE) of the first round portion (RP1) and the edge extending from the inner edge (RIE), the present invention is not limited thereto. In another embodiment, the first groove patterns (GP) may be arranged along the outer edge (ROE) of the first round portion (RP1). In another embodiment, the first groove patterns (GP) may be arranged along the inner edge (RIE) and the outer edge (ROE) of the first round portion (RP1).

[0220] In addition, although FIGS. 16A to 16C illustrate first groove patterns (GP) overlapping the fourth region (4A), the present invention is not limited thereto. In another embodiment, the first groove patterns (GP) may be arranged to overlap the third region (3A) and the fourth region (4A).

[0221] FIG. 17a is a plan view schematically showing a part of a display device (1) according to one embodiment of the present invention, and FIGS. 17b and 17c are cross-sectional views schematically showing a cross-section of one first island portion (11) included in the display device according to one embodiment of the present invention, respectively.

[0222] Referring to FIGS. 17a to 17c, the display device (1) may include a first island section (11) and a plurality of first bridge sections (12).

[0223] The first island portion (11) may have a rectangular shape with four sides. For example, the first island portion (11) may have a first edge (E1) and a second edge (E2) extending in a second direction (e.g., a y direction or a -y direction), and a third edge (E3) and a fourth edge (E4) extending in a first direction (e.g., an x ​​direction or a -x direction) and connecting the first edge (E1) and the second edge (E2).

[0224] The first island portion (11) can be connected to a plurality of first bridge portions (12). Two first bridge portions (12) can be arranged on opposite sides of the first island portion (11) along a first direction (e.g., x direction or -x direction), and the remaining two first bridge portions (12) can be arranged on opposite sides of the first island portion (11) along a second direction (e.g., y direction or -y direction). For example, the first bridge portion (12) can include a 1-1 bridge portion (12a), a 1-2 bridge portion (12b), a 1-3 bridge portion (12c), and a 1-4 bridge portion (12d). The 1-1 bridge section (12a) may be connected to the first edge (E1) of the 1st island section (11), the 1-2 bridge section (12b) may be connected to the second edge (E2) of the 1st island section (11), the 1-3 bridge section (12c) may be connected to the third edge (E3) of the 1st island section (11), and the 1-4 bridge section (12d) may be connected to the fourth edge (E4) of the 1st island section (11).

[0225] Each of the four first bridge portions (12) may be adjacent to respective corners of the first island portion (11). For example, the 1-1 bridge portion (12a) may be adjacent to the corner where the first edge (E1) and the third edge (E3) of the first island portion (11) meet, the 1-2 bridge portion (12b) may be adjacent to the corner where the second edge (E2) and the fourth edge (E4) of the first island portion (11) meet, the 1-3 bridge portion (12c) may be adjacent to the corner where the second edge (E2) and the third edge (E3) of the first island portion (11) meet, and the 1-4 bridge portion (12d) may be adjacent to the corner where the first edge (E1) and the fourth edge (E4) of the first island portion (11) meet.

[0226] In one embodiment, the first island portion (11) may include a first region (1A) and a second region (2A) outside the first region (1A). The first region (1A) may be defined as a region in which a barrier layer (103), a buffer layer (111), an inorganic insulating layer (IIL), and pixel driver circuits (PC) are arranged. The first region (1A) is located at the center of the first island portion (11), and the width (or area) of the first region (1A) may be smaller than the width (or area) of the first island portion (11). For example, the first region (1A) may have a fifth width (w3) smaller than the width of the first island portion (11), and the edge of the first region (1A) may be spaced inward from the edge of the first island portion (11) by a fourth width (w4).

[0227] The area from the edge of the first area (1A) to the edge of the first island portion (11) can be defined as the second area (2A). On a plan view, the second area (2A) can have a frame shape surrounding the first area (1A). The barrier layer (103), the buffer layer (111), the inorganic insulating layer (IIL), and the pixel driving circuit portion (PC) can be non-overlapping with the second area (2A). When the display device (1) is stretched, the second area (2A), which is relatively more deformed than the first area (1A) due to the first bridge portion (12), may not have a layer including an inorganic insulating material that is prone to cracking, unlike the first area (1A).

[0228] Second groove patterns (GPi) may be arranged in an area where the first island portion (11) and the first bridge portion (12) are connected. Here, the area where the first island portion (11) and the first bridge portion (12) are connected means a portion of the first bridge portion (12) adjacent to the first island portion (11) and a portion of the first island portion (11) adjacent to the first bridge portion (12). In other words, the second groove patterns (GPi) may be arranged in a portion of the first bridge portion (12) adjacent to the first island portion (11) and a portion of the first island portion (11) adjacent to the first bridge portion (12).

[0229] In one embodiment, as illustrated in FIG. 17A, second groove patterns (GPi) may be arranged in each of the areas where the first island portion (11) and the first bridge portion (12) are connected. The second groove patterns (GPi) may be arranged along one side edge of each of the first bridge portions (12) and along the edge of the first island portion (11) that is connected to one side edge of each of the first bridge portions (12).

[0230] For example, when the edges of each of the first bridge portions (12) are defined as the first edge and the second edge in the clockwise direction, in the area where the first island portion (11) and the 1-1 bridge portion (12a) are connected, the second groove patterns (GPi) may be arranged along the first edge (E1) of the first island portion (11) that is connected to the first edge of the 1-1 bridge portion (12a) and the first edge of the 1-1 bridge portion (12a). Similarly, in the area where the first island portion (11) and the 1-2 bridge portion (12b) are connected, the second groove patterns (GPi) may be arranged along the second edge (E2) of the first island portion (11) that is connected to the first edge of the 1-2 bridge portion (12b) and the first edge of the 1-2 bridge portion (12b). In the area where the first island portion (11) and the 1-3 bridge portion (12c) are connected, second groove patterns (GPi) can be arranged along the first edge of the 1-3 bridge portion (12c) and the third edge (E3) of the first island portion (11) that is connected to the first edge of the 1-3 bridge portion (12c). In the area where the first island portion (11) and the 1-4 bridge portion (12d) are connected, second groove patterns (GPi) can be arranged along the fourth edge (E4) of the first island portion (11) that is connected to the first edge of the 1-4 bridge portion (12d) and the first edge of the 1-4 bridge portion (12d).

[0231] The second groove patterns (GPi) can be formed (or defined) on the lower surface (-z direction surface) of the first island portion (11) and the lower surface (-z direction surface) of the first bridge portion (12). The lower surface (-z direction surface) of the first island portion (11) is the lower surface (-z direction surface) of the substrate (100) corresponding to the first island portion (11), and the lower surface (-z direction surface) of the first bridge portion (12) is the lower surface (-z direction surface) of the substrate (100) corresponding to the first bridge portion (12). Therefore, the second groove patterns (GPi) can be formed on the lower surface (-z direction surface) of the substrate (100).

[0232] The substrate (100) corresponding to the first island portion (11) may include a first base layer (101), a barrier layer (103), and a second base layer (105). In one embodiment, as illustrated in FIG. 17b, the second groove pattern (GPi) may be defined by the first base layer (101). For example, the second groove pattern (GPi) may be defined by an opening defined to penetrate the first base layer (101). In another embodiment, as illustrated in FIG. 17c, the second groove pattern (GPi) may be defined by the first base layer (101) and the second base layer (105). For example, the second groove pattern (GPi) may be defined by an opening defined to penetrate the first base layer (101) and the second base layer (105).

[0233] The second groove pattern (GPi) may have a sixth width (wpi) in the inward direction from the edge of the first island portion (11). In one embodiment, the sixth width (wpi) may be smaller than the fourth width (w4). Accordingly, the second groove patterns (GPi) arranged in the first island portion (11) may not overlap with the first region (1A) and may overlap with the second region (2A).

[0234] Among the second groove patterns (GPi), the second groove patterns (GPi) arranged in the first bridge portion (12) may be a part of the first groove pattern (GP) described above.

[0235] The second groove patterns (GPi) can reduce or prevent stress from being concentrated in the area where the edge of the first island portion (11) and the edge of the first bridge portion (12) are connected when the display device (1) contracts or elongates.

[0236] FIGS. 18A and 18B are plan views schematically illustrating a portion of a display device according to one embodiment of the present invention, respectively.

[0237] Referring to FIGS. 18a and 18b, the display device (1) may include a first island portion (11) and a plurality of first bridge portions (12). The first island portion (11) may have a first edge (E1) and a second edge (E2) extending in a second direction (e.g., a y direction or a -y direction), and a third edge (E3) and a fourth edge (E4) extending in the first direction (e.g., an x ​​direction or a -x direction) and connecting the first edge (E1) and the second edge (E2).

[0238] The first island section (11) can be connected to a plurality of first bridge sections (12). The first bridge section (12) can include a first-first bridge section (12a), a first-second bridge section (12b), a first-third bridge section (12c), and a first-fourth bridge section (12d). The first-first bridge section (12a) can be connected to a first edge (E1) of the first island section (11), the first-second bridge section (12b) can be connected to a second edge (E2) of the first island section (11), the first-third bridge section (12c) can be connected to a third edge (E3) of the first island section (11), and the first-fourth bridge section (12d) can be connected to a fourth edge (E4) of the first island section (11).

[0239] Looking at the first island portion (11), the first island portion (11) may include a first region (1A) and a second region (2A) outside the first region (1A). The first region (1A) may be defined as a region where a barrier layer (103), a buffer layer (111), an inorganic insulating layer (IIL), and pixel driving circuits (PC) are arranged. The region from the edge of the first region (1A) to the edge of the first island portion (11) may be defined as a second region (2A). Unlike the first region (1A), the second region (2A) may not have a layer including an inorganic insulating material that is prone to cracking.

[0240] Second groove patterns (GPi) can be arranged in the area where the first island section (11) and the first bridge section (12) are connected.

[0241] In one embodiment, as illustrated in FIG. 18a, at least one of the second groove patterns (GPi) may be arranged along one side edge of each of the first bridge portions (12) and an edge of the first island portion (11) connected to one side edge of the first bridge portions (12), and some of the remaining second groove patterns (GPi) may be arranged along the other side edge of each of the first bridge portions (12) and an edge of the first island portion (11) connected to the other side edge of the first bridge portions (12).

[0242] For example, when each edge of the first bridge portions (12) is defined as a first edge and a second edge in a clockwise direction, in the area where the first island portion (11) and the 1-1 bridge portion (12a) are connected, some of the second groove patterns (GPi) may be arranged along the first edge (E1) of the first island portion (11) that is connected to the first edge of the 1-1 bridge portion (12a) and the first edge of the 1-1 bridge portion (12a), and some of the second groove patterns (GPi) may be arranged along the third edge (E3) of the first island portion (11) that is connected to the second edge of the 1-1 bridge portion (12a) and the second edge of the 1-1 bridge portion (12a). Similarly to how the second groove patterns (GPi) are arranged in the area where the first island section (11) and the 1-1 bridge section (12a) are connected, the second groove patterns (GPi) may be arranged in each of the areas where the first island section (11) and the 1-2 bridge section (12b) are connected, the area where the first island section (11) and the 1-3 bridge section (12c) are connected, and the areas where the first island section (11) and the 1-4 bridge section (12d) are connected.

[0243] In another embodiment, as illustrated in FIG. 18b, second groove patterns (GPi) may be arranged in each of the areas where the first island portion (11) and the first bridge portion (12) are connected. The second groove patterns (GPi) may be arranged along one side edge of each of the first bridge portions (12) and along the edge of the first island portion (11) connected to one side edge of each of the first bridge portions (12), and some of the second groove patterns (GPi) may extend from one side edge of the first bridge portion (12) to the other side edge of the first bridge portion (12) or to the edge of the first island portion (11) connected to the other side edge of the first bridge portion (12).

[0244] For example, in an area where the first island portion (11) and the 1-1 bridge portion (12a) are connected, second groove patterns (GPi) may be arranged along the first edge of the 1-1 bridge portion (12a) and the first edge (E1) of the first island portion (11). Some of the second groove patterns (GPi) may extend across the corner of the 1-1 bridge portion (12a) or the 1st island portion (11) to the second edge of the 1-1 bridge portion (12a) or the third edge (E3) of the 1st island portion (11) that is connected to the second edge of the 1-1 bridge portion (12a). Similarly to how the second groove patterns (GPi) are arranged in the area where the first island section (11) and the 1-1 bridge section (12a) are connected, the second groove patterns (GPi) may be arranged in each of the areas where the first island section (11) and the 1-2 bridge section (12b) are connected, the area where the first island section (11) and the 1-3 bridge section (12c) are connected, and the areas where the first island section (11) and the 1-4 bridge section (12d) are connected.

[0245] Although the above-described embodiments describe a case where the first groove pattern (GP) and / or the second groove pattern (GPi) are arranged in the first island portion (11) and the first bridge portion (12), the present invention is not limited thereto. The shape of the substrate (100) corresponding to the first island portion (11) and / or the substrate (100) corresponding to the first bridge portion (12) is substantially the same as the shape of the substrate (100) corresponding to the second island portion (21) and / or the substrate (100) corresponding to the second bridge portion (22) described above with reference to FIG. 4, but the sizes and areas thereof may be different from each other. For example, the first groove patterns (GP) and / or the second groove patterns (GPi) according to the above-described embodiments may also be arranged in the second island portion (21) and the second bridge portion (22).

[0246] FIGS. 19A to 19C are plan views schematically illustrating a display device according to one embodiment of the present invention, respectively.

[0247] Referring to FIGS. 19A to 19C, the display device (1) can be extended or contracted along the -y direction while one side of the display device (1) is fixed by an external object or an external force applied by a user. The display device (1) can include a display area (DA) and a non-display area (NDA). The display area (DA) and / or the non-display area (NDA) of the display device (1) can be extended in the -y direction.

[0248] As described with reference to FIG. 4, the display device (1) may include first island portions (11) spaced apart from each other in a first direction (e.g., the x direction or the -x direction) and a second direction (e.g., the y direction or the -y direction) in a display area (DA) and first bridge portions (12) connecting adjacent first island portions (11), and may include second island portions (21) spaced apart from each other in a first direction (e.g., the x direction or the -x direction) and a second direction (e.g., the y direction or the -y direction) in a non-display area, for example, the first non-display area (NDA1) illustrated in FIG. 4, and second bridge portions (22) connecting adjacent second island portions (21). Groove patterns open in the -z direction may be arranged in the first island portions (11), the first bridge portions (12), the second island portions (21) and / or the second bridge portions (22).

[0249] The elongation of the display area (DA) may be higher than or equal to the elongation of the non-display area (NDA). Accordingly, the density of the groove patterns arranged in the first island portions (11) and the first bridge portions (12) may be higher than or equal to the density of the groove patterns arranged in the second island portions (21) and the second bridge portions (22). Here, the density of the groove patterns may be defined as a ratio of the area (or volume) occupied by the groove patterns to the total area (or volume) of a given region. The density of the groove patterns may be adjusted by the width, length, spacing, and / or shape of the groove pattern.

[0250] Third bridge units (23) may be arranged in the second sub-non-display area (SNDA2) to connect the display area (DA) and the first sub-non-display area (SNDA1). One end of the third bridge unit (23) may be connected to the second island unit (21) and / or the second bridge unit (22), and the other end of the third bridge unit (23) may be connected to the first island unit (11) and / or the first bridge unit (12).

[0251] Due to the difference in elongation between the display area (DA) and the non-display area (NDA), when the display device (1) is contracted or elongated, stress may be concentrated in the second sub-non-display area (SNDA2) illustrated in FIG. 4. Accordingly, groove patterns may not be arranged in the third bridge portions (23). Alternatively, the density of groove patterns arranged in the third bridge portions (23) may be relatively lower than the density of groove patterns arranged in the first island portions (11) and the first bridge portions (12), and the density of groove patterns arranged in the second island portions (21) and the second bridge portions (22).

[0252] In one embodiment, the display area (DA) may include a plurality of sub-areas having different elongation ratios. For example, although FIG. 19A illustrates that the display area (DA) includes a first sub-area (1R), a second sub-area (2R), a third sub-area (3R), a fourth sub-area (4R), and a fifth sub-area (5R), the present invention is not limited thereto. The display area (DA) may include a smaller number of sub-areas having different elongation ratios, or may include a larger number of sub-areas. The first sub-area (1R), the second sub-area (2R), the third sub-area (3R), the fourth sub-area (4R), and the fifth sub-area (5R) may be sequentially arranged along the y direction. In the present specification, the "groove pattern of area A" means groove patterns arranged in the island portion and / or bridge portion included in area A.

[0253] Each of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may have a rectangular shape that is elongated in a first direction (e.g., the x direction or the -x direction) and extends from a left (-x direction) edge of the display area (DA) to a right (+x direction) edge of the display area (DA). The widths of each of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) in a second direction (e.g., the y direction or the -y direction) may be the same or different. For example, the width in the second direction (e.g., the y direction or the -y direction) of the fifth sub-region (5R) arranged on a fixed side of the display device (1) may be smaller than the width in the second direction (e.g., the y direction or the -y direction) of the other sub-regions (1R to 4R).

[0254] In one embodiment, as illustrated in FIGS. 19b and 19c, the display area (DA) may include a plurality of sub-areas, and each sub-area may be arranged to contact a lower (-y direction) edge of the display area (DA). The first sub-area (1R), the second sub-area (2R), the third sub-area (3R), and the fourth sub-area (4R) may be spaced apart from a left (-x direction) edge, a right (+x direction) edge, and an upper (+y direction) edge of the display area (DA). The second sub-area (2R) may be arranged outside the first sub-area (1R), the third sub-area (3R) may be arranged outside the second sub-area (2R), and the fourth sub-area (4R) may be arranged outside the fourth sub-area (4R). The fifth sub-area (5R) may be the remaining display area (DA) outside the fourth sub-area (4R).

[0255] In one embodiment, as illustrated in FIG. 19b, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a square shape with rounded corners. In another embodiment, as illustrated in FIG. 19c, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a circular or oval shape. The fifth sub-region (5R) may be an outer region of the fourth sub-region (4R).

[0256] The first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may have different elongation ratios. In other words, the density of the groove patterns of each of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be different.

[0257] In one embodiment, the density of the groove patterns of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be changed stepwise so that the density of the groove pattern of the first sub-region (1R) is the highest and the density of the groove pattern of the fifth sub-region (5R) is the lowest. That is, the density of the groove pattern of the first sub-region (1R) may be greater than the density of the groove pattern of the second sub-region (2R), the density of the groove pattern of the second sub-region (2R) may be greater than the density of the groove pattern of the third sub-region (3R), the density of the groove pattern of the third sub-region (3R) may be greater than the density of the groove pattern of the fourth sub-region (4R), and the density of the groove pattern of the fourth sub-region (4R) may be greater than the density of the groove pattern of the fifth sub-region (5R).

[0258] In another embodiment, the density of the groove patterns of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be changed stepwise so that the density of the groove pattern of the first sub-region (1R) is the smallest, and the density of the groove pattern of the fifth sub-region (5R) is the largest.

[0259] FIGS. 20A to 20E are plan views schematically illustrating a display device according to one embodiment of the present invention, respectively.

[0260] Referring to FIGS. 20A to 20E, the display device (1) can be extended in a second direction (e.g., the y direction and / or the -y direction) by an external force applied by an external object or a part of a human body. The display area (DA) and / or the non-display area (NDA) of the display device (1) can be extended in the ±y direction.

[0261] The display area (DA) may include a plurality of sub-areas having different elongation rates. In one embodiment, as illustrated in FIG. 20A, the display area (DA) may include a first sub-area (1R), a second-first sub-area (2Ra), a second-second sub-area (2Rb), a third-first sub-area (3Ra), a third-second sub-area (3Rb), a fourth-first sub-area (4Ra), a fourth-second sub-area (4Rb), a fifth-first sub-area (5Ra), and a fifth-second sub-area (5Rb). With the first sub-region (1R) as the center, the second-first sub-region (2Ra), the third-first sub-region (3Ra), the fourth-first sub-region (4Ra), and the fifth-first sub-region (5Ra) may be sequentially arranged in the +y direction, and with the first sub-region (1R) as the center, the second-second sub-region (2Rb), the third-second sub-region (3Rb), the fourth-second sub-region (4Rb), and the fifth-second sub-region (5Rb) may be sequentially arranged in the -y direction.

[0262] Each of the first sub-area (1R), the second-first sub-area (2Ra), the second-second sub-area (2Rb), the third-first sub-area (3Ra), the third-second sub-area (3Rb), the fourth-first sub-area (4Ra), the fourth-second sub-area (4Rb), the fifth-first sub-area (5Ra), and the fifth-second sub-area (5Rb) may have a rectangular shape that is elongated in the first direction (e.g., the x direction or the -x direction) and extends from the left (-x direction) edge of the display area (DA) to the right (+x direction) edge of the display area (DA).

[0263] The elongation of the sub-regions that are arranged symmetrically with respect to the first sub-region (1R) as the center may be the same. In other words, the densities of the groove patterns of the sub-regions that are arranged symmetrically with respect to the first sub-region (1R) as the center may be the same. For example, the density of the groove pattern of the 2-1 sub-region (2Ra) and the density of the groove pattern of the 2-2 sub-region (2Rb) may be the same, the density of the groove pattern of the 3-1 sub-region (3Ra) and the density of the groove pattern of the 3-2 sub-region (3Rb) may be the same, the density of the groove pattern of the 4-1 sub-region (4Ra) and the density of the groove pattern of the 4-2 sub-region (4Rb) may be the same, and the density of the groove pattern of the 5-1 sub-region (5Ra) and the density of the groove pattern of the 5-2 sub-region (5Rb) may be the same.

[0264] In one embodiment, the density of the groove pattern of the first sub-area (1R) located at the center of the display area (DA) may be changed in steps so that the density of the groove pattern of the 5-1 sub-area (5Ra) and the 5-2 sub-area (5Rb) located at the outer side of the display area (DA) is the greatest, and the density of the groove pattern of the 5-1 sub-area (5Ra) and the 5-2 sub-area (5Rb) located at the outer side of the display area (DA) is the smallest.

[0265] In another embodiment, the density of the groove patterns of the sub-areas may be changed in stages so that the density of the groove patterns of the first sub-area (1R) located at the center of the display area (DA) is the smallest, and the density of the groove patterns of the 5-1 sub-area (5Ra) and the 5-2 sub-area (5Rb) located at the outer side of the display area (DA) is the largest.

[0266] In one embodiment, as illustrated in FIGS. 20B and 20C, the display area (DA) may include a plurality of sub-areas, and the center of each sub-area may be arranged to overlap the center of the display area (DA). Here, the center of each area may be an intersection of an imaginary straight line that bisects the area in a first direction (e.g., the x direction or the -x direction) and an imaginary straight line that bisects the area in a second direction (e.g., the y direction or the -y direction). The first sub-area (1R) may be arranged to overlap the center of the display area (DA). The second sub-region (2R) may be arranged on the outside of the first sub-region (1R), the third sub-region (3R) may be arranged on the outside of the second sub-region (2R), the fourth sub-region (4R) may be arranged on the outside of the fourth sub-region (4R), and the fifth sub-region (5R) may be arranged on the outside of the fourth sub-region (4R). Each of the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may have a kind of frame shape extending along the edge of the inner sub-region.

[0267] In one embodiment, as illustrated in FIG. 20b, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a square shape with rounded corners. In another embodiment, as illustrated in FIG. 20c, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a circular or oval shape.

[0268] In one embodiment, as illustrated in FIGS. 20d and 20e, the display area (DA) includes a plurality of sub-areas, and each of the sub-areas may be arranged to contact the lower (-y direction) edge of the display area (DA). The first sub-area (1R), the second sub-area (2R), the third sub-area (3R), and the fourth sub-area (4R) may be arranged to be spaced apart from the left (-x direction) edge, the right (+x direction) edge, and the upper (+y direction) edge of the display area (DA). The second sub-region (2R) may be arranged on the outside of the first sub-region (1R), the third sub-region (3R) may be arranged on the outside of the second sub-region (2R), the fourth sub-region (4R) may be arranged on the outside of the fourth sub-region (4R), and the fifth sub-region (5R) may be arranged on the outside of the fourth sub-region (4R). The left (-x direction) edge, the right (+x direction) edge, and the upper (+y direction) edge of the fifth sub-region (5R) may coincide with the left (-x direction) edge, the right (+x direction) edge, and the upper (+y direction) edge of the display area (DA).

[0269] In one embodiment, as illustrated in FIG. 20d, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a square shape with rounded corners. In another embodiment, as illustrated in FIG. 20e, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a circular or oval shape. The fifth sub-region (5R) may be an outer region of the fourth sub-region (4R).

[0270] As described above, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may have different elongation ratios. In other words, the density of the groove patterns arranged in each of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be different.

[0271] In one embodiment, the densities of the groove patterns of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be changed stepwise so that the density of the groove pattern of the first sub-region (1R) is the greatest and the density of the groove pattern of the fifth sub-region (5R) is the smallest. In another embodiment, the densities of the groove patterns of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be changed stepwise so that the density of the groove pattern of the first sub-region (1R) is the smallest and the density of the groove pattern of the fifth sub-region (5R) is the greatest.

[0272] FIGS. 21A to 21C are schematic plan views each showing a display device according to an embodiment of the present invention.

[0273] Referring to FIGS. 21A to 21C, the display device (1) can be extended in a plurality of directions, for example, a first direction (e.g., an x ​​direction and / or a -x direction) and a second direction (e.g., a y direction and / or a -y direction) by an external force applied by an external object or a part of a human body. The display area (DA) and / or the non-display area (NDA) of the display device (1) can be extended in the ±x direction and the ±y direction.

[0274] The display area (DA) may include a plurality of sub-areas, and the center of each sub-area may be arranged to overlap the center of the display area (DA). Here, the center of each area may be an intersection of an imaginary straight line that bisects the area in a first direction (e.g., in the x direction or the -x direction) and an imaginary straight line that bisects the area in a second direction (e.g., in the y direction or the -y direction). The first sub-area (1R) may be arranged to overlap the center of the display area (DA). The second sub-area (2R) may be arranged outside the first sub-area (1R), the third sub-area (3R) may be arranged outside the second sub-area (2R), the fourth sub-area (4R) may be arranged outside the fifth sub-area (5R), and the fifth sub-area (5R) may be arranged outside the fourth sub-area (4R). Each of the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may have a kind of frame shape extending along the edge of the inner sub-region.

[0275] In one embodiment, as illustrated in FIG. 21a, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a square shape. In another embodiment, as illustrated in FIG. 21b, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a square shape with rounded corners. In yet another embodiment, as illustrated in FIG. 21c, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), and the fourth sub-region (4R) may have a circular or oval shape.

[0276] As described above, the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may have different elongation ratios. In other words, the density of the groove patterns arranged in each of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be different.

[0277] In one embodiment, the densities of the groove patterns of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be changed stepwise so that the density of the groove pattern of the first sub-region (1R) is the greatest and the density of the groove pattern of the fifth sub-region (5R) is the smallest. In another embodiment, the densities of the groove patterns of the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R) may be changed stepwise so that the density of the groove pattern of the first sub-region (1R) is the smallest and the density of the groove pattern of the fifth sub-region (5R) is the greatest.

[0278] FIGS. 22a and 22b are schematic plan views each showing a display device according to one embodiment of the present invention.

[0279] The display device (1) can be extended in a third direction (e.g., in the z direction or the -z direction) by an external force applied by an external object or a part of a human body. In one embodiment, FIGS. 22A and 22B illustrate that a part of the display device (1), for example, a part of the display area (DA), protrudes in the z direction along the surface of the hemisphere (PP).

[0280] Referring to FIG. 22A, the display area (DA) may include a plurality of sub-areas having different elongation rates. For example, as illustrated in FIG. 22A, the display area (DA) may include first sub-areas (1R), second sub-areas (2R), third sub-areas (3R), fourth sub-areas (4R), fifth sub-areas (5R), and sixth sub-areas (6R).

[0281] In one embodiment, the first sub-regions (1R) may be arranged to overlap the edges of the hemisphere (PP). In one embodiment, each of the first sub-regions (1R) may be arranged above (in the y direction), below (in the -y direction), left (in the -x direction), and right (in the x direction) with respect to the center of the hemisphere (PP).

[0282] Each of the second sub-regions (2R) may be arranged on the outside of the first sub-region (1R) so as to surround the first sub-region (1R). Each of the third sub-regions (3R) may be arranged on the outside of the second sub-region (2R) so as to surround the second sub-region (2R). In a plan view, the first sub-region (1R) may have a circular or oval shape. Each of the second sub-regions (2R) and the third sub-regions (3R) may have a kind of frame shape extending along the edge of the inner sub-region.

[0283] Each of the fourth sub-regions (4R) may be arranged on the outside of the third sub-region (3R), and may have an approximately triangular shape with one vertex directed toward the center of the hemisphere (PP). Each of the fifth sub-regions (5R) may be arranged on the outside of the third sub-region (3R) and the fourth sub-region (4R), and may have an approximately triangular shape with one vertex directed toward the center of the hemisphere (PP). The sixth sub-region (6R) may be a display area (DA) on the outside of the first to fifth sub-regions (1R) to (5R).

[0284] At this time, the closer the sub-region is to the edge of the hemisphere (PP) where stress is concentrated, the higher the elongation can be relatively. In other words, the closer the sub-region is to the edge of the hemisphere (PP), the higher the density of the groove pattern can be relatively. For example, among the first sub-region (1R), the second sub-region (2R), the third sub-region (3R), the fourth sub-region (4R), and the fifth sub-region (5R), the density of the groove patterns of the sub-regions can be changed in steps so that the density of the groove pattern of the first sub-region (1R) is the largest, and the density of the groove pattern of the fifth sub-region (5R) is the smallest. The density of the groove pattern of the sixth sub-region (6R) can be smaller than the density of the groove pattern of the fifth sub-region (5R).

[0285] In one embodiment, as illustrated in FIG. 22B, the display area (DA) may include first to seventh sub-areas (1R, 2R, 3R, 4R, 5R, 6R, 7R). In a plan view, the center of each of the first to sixth sub-areas (1R, 2R, 3R, 4R, 5R, 6R) may coincide with the center of the hemisphere (PP). In a plan view, the first sub-area (1R) may have a circular shape having the same center as the center of the hemisphere (PP). The second sub-area (2R) may be arranged outside the first sub-area (1R), the third sub-area (3R) may be arranged outside the second sub-area (2R), the fourth sub-area (4R) may be arranged outside the fifth sub-area (5R), the fifth sub-area (5R) may be arranged outside the fourth sub-area (4R), and the sixth sub-area (6R) may be arranged outside the fifth sub-area (5R). Each of the second sub-area (2R), the third sub-area (3R), the fourth sub-area (4R), the fifth sub-area (5R), and the sixth sub-area (6R) may have a kind of frame shape extending along the edge of the inner sub-area. The seventh sub-area (7R) may be a display area (DA) outside the sixth sub-area (6R).

[0286] At this time, the closer the sub-region is to the edge of the hemisphere (PP) where stress is concentrated, the higher the elongation can be relatively. For example, the density of the groove pattern of the third sub-region (3R) overlapping the edge of the hemisphere (PP) can be the highest. The density of the groove pattern of the second sub-region (2R) can be lower than the density of the groove pattern of the third sub-region (3R), but higher than the density of the groove pattern of the first sub-region (1R). The density of the groove pattern of the fourth sub-region (4R) can be lower than the density of the groove pattern of the third sub-region (3R), but higher than the density of the groove pattern of the fifth sub-region (5R). The density of the groove pattern of the fifth sub-region (5R) can be higher than the density of the groove pattern of the sixth sub-region (6R). The density of the groove pattern of the seventh sub-region (7R) may be lower than the density of the groove pattern of the sixth sub-region (6R).

[0287] By arranging sub-regions with different groove pattern densities along the elongation direction of the display device (1), the stress of the display device (1) can be distributed and the elongation rate can be improved. In the above-described embodiments, the number of sub-regions with different elongation rates can be changed.

[0288] The display device (1) according to the above-described embodiments can be used in various electronic devices capable of providing images. Here, the term "electronic device" refers to a device that uses electricity and can provide a predetermined image.

[0289] FIGS. 23A to 23G are perspective views schematically illustrating embodiments of an electronic device including a display device according to one embodiment of the present invention, respectively.

[0290] Referring to FIG. 23A, a display device according to an embodiment of the present invention may be utilized in a wearable electronic device (3100) that can be worn on a part of a user's body. The wearable electronic device (3100) may include a body portion (3110) and a display portion (3120) provided on the body portion (3110). The display device according to embodiments of the present invention may be utilized as the display portion (3120) of the wearable electronic device (3100). As illustrated in FIG. 23A, the wearable electronic device (3100) may be transformable. In one embodiment, it may be utilized as a smart watch or a smartphone, depending on the user's selection.

[0291] FIG. 23B illustrates a medical electronic device (3200). In one embodiment, the medical electronic device (3200) may include a body portion (3210) and a light-emitting portion (3220). A display device according to embodiments of the present invention may be used as the light-emitting portion (3220) of the medical electronic device (3200). The light-emitting portion (3220) may emit light of a certain wavelength band (e.g., infrared, visible light, etc.) to the patient's body. In one embodiment, the body portion (3210) may have a stretchable fiber material and may have a structure that allows the light-emitting portion to be worn on the body of a user.

[0292] FIG. 23C illustrates an educational electronic device (3300). In one embodiment, the educational electronic device may include a display unit (3320) provided within a frame (3310). The display unit (3320) may utilize a display device according to embodiments of the present invention. The display unit (3320) may provide an image such as a sea with crashing waves, a snow-covered mountain, or a volcano with flowing lava, wherein the display unit (3320) may expand in the height direction (e.g., the z direction) to reflect the height of the wave, mountain, or volcano. In some embodiments, a portion of the display unit (3320) may sequentially vary in height along the direction of flowing lava to display the movement of lava in three dimensions. The educational electronic device (3300) may include a plurality of pins (or stroke units, 3330) arranged on the back surface of the display unit (3320) so that the display unit (3320) expands in the height direction. The pins (3330) can be implemented to move along a third direction (e.g., the z direction or the -z direction) so that the image displayed on the display unit (3320) has a three-dimensional height. Fig. 23c describes an educational electronic device (3300), but its use is not limited to providing certain image information.

[0293] While the electronic devices illustrated in FIGS. 23A through 23C are described as electronic devices whose shapes can be variable, the present invention is not limited thereto. As described in the embodiments below, display devices according to embodiments of the present invention can be used in electronic devices in which a portion capable of displaying an image (e.g., a screen) is fixed.

[0294] FIG. 23D illustrates a robot (3400) as another electronic device according to one embodiment of the present invention. The robot (3400) can recognize movement or objects using a camera unit (3440) and display a predetermined image to a user through a display unit (3420, 3430). In some embodiments, since the display devices according to one embodiment of the present invention can extend in various directions as described above, they can be assembled into a body frame having a hemispherical shape, and thus the robot (3400) can include a hemispherical display unit (3420, 3430).

[0295] FIG. 23E illustrates a vehicle display device (3500) as another electronic device according to one embodiment of the present invention. The vehicle display device (3500) may include a cluster (3510), a center information display (CID) (3520), and / or a co-driver display. Since the display device according to the embodiment of the present invention can be extended in various directions, it may be used in the cluster (3510), the center information display (CID) (3520), and / or the co-driver display regardless of the shape of the internal frame of the vehicle.

[0296] Although FIG. 23e illustrates that the cluster (3510), the Center Information Display (CID) (3520), and / or the co-driver display are each separate, the present invention is not limited thereto. In another embodiment, two or more selected from the cluster (3510), the Center Information Display (CID) (3520), and the co-driver display may be connected as one unit.

[0297] In some embodiments, a vehicle display device (3500) may include a button (3540) capable of displaying a predetermined image. Referring to the enlarged view of FIG. 23E, the hemispherical button (3540) may include an object (3542) that provides a user experience of the button while moving in the z-direction or the -z-direction, and a display device positioned on the object (3542). In some embodiments, when the object (3542) has a three-dimensionally rounded surface, the display device may also have a three-dimensionally rounded surface.

[0298] FIG. 23F illustrates an electronic device according to one embodiment of the present invention, which is an electronic device (3600) for advertising or display purposes. In some embodiments, the electronic device (3600) for advertising or display purposes may be installed on a fixed structure (3610), such as a wall or a pillar. If the structure (3610) includes a recessed surface as illustrated in FIG. 23F, the electronic device (3600) for advertising or display purposes may also be positioned along the recessed surface of the structure (3610). In some embodiments, the electronic device (3600) for advertising or display purposes may be installed on the structure (3610) using a heat shrink film or the like.

[0299] FIG. 23G illustrates an electronic device according to one embodiment of the present invention as a controller (3700). The controller (3700) may include image-type buttons. For example, the controller (3700) may include first to third button areas (3720, 3730, 3740) in which a portion of the display unit (3710) protrudes in the z direction or protrudes in the -z direction (or is sunken in the z direction). In some embodiments, the first and third button areas (3720, 3740) may protrude in the z direction, and the second button area (3730) may protrude in the -z direction (or is sunken in the z direction).

[0300] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A substrate having first and second surfaces facing each other, including bridge regions having a meandering shape and connecting island regions and neighboring island regions; and including wiring arranged on the first surface of the above bridge area; A display device, wherein a plurality of groove patterns are defined to be open in the second surface direction in the above bridge area.

2. In paragraph 1, Each of the above bridge areas, Two round fins; and A display device comprising a straight section between the two round sections.

3. In paragraph 2, Each of the above two round parts includes an inner edge and an outer edge, A display device, wherein the plurality of groove patterns are arranged along the inner edge.

4. In paragraph 2, Each of the above two round parts includes an inner edge and an outer edge, A display device, wherein the plurality of groove patterns are arranged along the outer edge.

5. In paragraph 2, Each of the above two round parts includes an inner edge and an outer edge, At least one of the plurality of groove patterns is arranged along the inner edge, A display device, wherein the remainder of the plurality of groove patterns are arranged along the outer edge.

6. In paragraph 5, A display device, wherein the at least one groove pattern arranged along the inner edge and the remaining groove patterns arranged along the outer edge are arranged in an alternating manner.

7. In paragraph 2, The above bridge region includes a first edge and a second edge, A display device, wherein each of the plurality of groove patterns extends from a first edge of the bridge area to a second edge of the bridge area.

8. In paragraph 7, A display device, wherein, in a direction perpendicular to the extension direction of the bridge area, the width of the bridge area and the width of each of the plurality of groove patterns are the same.

9. In paragraph 2, The above plurality of groove patterns are arranged on the two round parts and the straight part, A display device wherein the spacing between the groove patterns arranged on the round portion is smaller than the spacing between the groove patterns arranged on the straight portion.

10. In paragraph 2, The above plurality of groove patterns are arranged on the two round parts and the straight part, A display device, wherein the width of the groove patterns arranged on the round portion in the extension direction of the bridge region is larger than the width of the groove patterns arranged on the straight portion in the extension direction of the bridge region.

11. In paragraph 1, The substrate comprises a first base layer and a second base layer on the first base layer, A display device, wherein each of the plurality of groove patterns is defined by an opening defined in the first base layer.

12. In paragraph 1, The substrate comprises a first base layer and a second base layer on the first base layer, A display device, wherein each of the plurality of groove patterns is defined by an opening defined in the first base layer and the second base layer.

13. In paragraph 1, The above bridge region includes a first region overlapping the wiring and a second region outside the first region, A display device, wherein the plurality of groove patterns are arranged in the second region.

14. In paragraph 1, A display device, wherein each of the plurality of groove patterns has a width in the extension direction of the bridge region that becomes wider as it approaches the edge of the bridge region.

15. In paragraph 1, A display device, wherein each of the plurality of groove patterns has a width in the extension direction of the bridge region that becomes narrower as it approaches the edge of the bridge region.

16. In paragraph 1, A display device, wherein each of the plurality of groove patterns on the flat surface has a rounded edge along an arc of a virtual circle or a virtual ellipse.

17. A substrate having first and second surfaces facing each other, including bridge regions having a meandering shape and connecting island regions and neighboring island regions; and Including wiring arranged on the first surface of each of the above bridge regions, A display device, wherein a plurality of groove patterns are defined to be open in the second surface direction in a portion of the island region adjacent to the bridge regions and a portion of the bridge regions adjacent to the island region.

18. In paragraph 17, Each of the above bridge regions has a first edge and a second edge, A display device, wherein the plurality of groove patterns are arranged along the first edge of each of the bridge regions and the edge of the island region connected to the first edge.

19. In Article 17, Each of the above bridge regions has a first edge and a second edge, At least one of the plurality of groove patterns is arranged along the first edge of each of the bridge regions and along the edge of the island region connected to the first edge, A display device, wherein the remainder of the plurality of groove patterns are arranged along the second edge of each of the bridge regions and the edge of the island region connected to the second edge.

20. In paragraph 17, Each of the above bridge regions has a first edge and a second edge, A display device, wherein the plurality of groove patterns are arranged along the first edge of each of the bridge regions and the edge of the island region connected to the first edge, wherein at least one of the plurality of groove patterns extends from the first edge of the bridge region to the second edge of the bridge region or to the edge of the island region connected to the second edge.

21. In a display device having a display area and a non-display area outside the display area, A substrate having first and second surfaces facing each other, the substrate including bridge regions having a meandering shape and connecting island regions and neighboring island regions; and including wiring arranged on the first surface of the above bridge area; A plurality of groove patterns are defined on the above substrate to be open in the second surface direction, A display device, wherein the display area includes a plurality of sub-areas having different elongation rates.

22. In paragraph 21, A display device wherein the density of groove patterns of each of the plurality of sub-regions is different.

23. In paragraph 22, The above plurality of sub-regions include a first sub-region, a second sub-region outside the first sub-region, and a third sub-region outside the second sub-region, A display device, wherein the density of groove patterns of the first sub-region is higher than the density of groove patterns of the second sub-region, and the density of groove patterns of the second sub-region is higher than the density of groove patterns of the third sub-region.

24. In paragraph 22, The above plurality of sub-regions include a first sub-region, a second sub-region outside the first sub-region, and a third sub-region outside the second sub-region, A display device, wherein the density of groove patterns of the first sub-region is lower than the density of groove patterns of the second sub-region, and the density of groove patterns of the second sub-region is lower than the density of groove patterns of the third sub-region.

25. In paragraph 22, The above plurality of sub-regions include a first sub-region, a second sub-region outside the first sub-region, and a third sub-region outside the second sub-region, A display device, wherein the density of the groove patterns of the second sub-region is higher than the density of the groove patterns of the first sub-region and the density of the groove patterns of the third sub-region.

Images