Display device

Abstract

A display device is disclosed. The display device includes a display module having a first non-foldable area, a foldable area, and a second non-foldable area arranged in a first direction in an unfolded state, and a first support layer disposed under the display module and having a mesh pattern including a plurality of first holes overlapping the foldable area, wherein the first holes are arranged in the first direction and a second direction intersecting the first direction, and wherein: each of the first holes has a first width in the second direction and a second width in the first direction, the first width is in a range of about 2000 μm to about 9000 μm, and the second width is in a range of about 100 μm to about 250 μm.

Description

[0001] This application is a divisional application of Chinese patent application No. 202110097336.4, filed on January 25, 2021, entitled "Display Device".

[0002] Cross-reference to related applications

[0003] This application claims priority and benefit to Korean Patent Application No. 10-2020-0018529, filed on February 14, 2020, and Korean Patent Application No. 10-2020-0023759, filed on February 26, 2020, which are incorporated herein by reference for all purposes as fully set forth herein. Technical Field

[0004] Exemplary implementations of the present invention generally relate to display devices, and more specifically, to display devices having a foldable region. Background Technology

[0005] Electronic devices that provide images to users (such as smartphones, digital cameras, laptops, navigation units, and smart TVs) include display devices to display images. The display device generates images and provides them to the user through a display screen.

[0006] In recent years, various flexible display devices that can be formed into curved shapes, bendable, or rollable have been researched. Flexible display devices that can be formed into various shapes are easy to carry and improve user convenience.

[0007] In flexible display devices, foldable display devices include display modules that fold about a folding axis extending in one direction. The display module folds or unfolds about the folding axis.

[0008] The information disclosed in this background section is only for understanding the background technology of the inventive concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0009] The applicant has discovered that display devices with foldable display panels are damaged due to repeated folding and unfolding operations. Specifically, the applicant has recognized that the support layer used to support the foldable display panel is easily damaged by repeated folding and unfolding operations because it is folded and unfolded together with the foldable display panel.

[0010] The display device constructed according to the principles and exemplary implementations of the present invention can reduce stress and defects in the support layer for supporting the foldable display panel by providing a grid pattern including multiple holes.

[0011] Furthermore, the display device constructed according to the principles and exemplary implementations of the present invention includes a support layer having characteristics suitable for a foldable display device.

[0012] Other features of the inventive concept will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practice of the inventive concept.

[0013] According to one or more exemplary embodiments of the present invention, a display device includes: a display module having a first non-foldable region, a foldable region, and a second non-foldable region arranged in a first direction in an unfolded state; and a first support layer disposed below the display module and having a grid pattern, the grid pattern including a plurality of first holes overlapping the foldable regions, wherein the first holes are arranged in the first direction and in a second direction intersecting the first direction, and wherein: each of the first holes has a first width in the second direction and a second width in the first direction, the first width being in the range of about 2000 μm to about 9000 μm, and the second width being in the range of about 100 μm to about 250 μm.

[0014] The end of the first support layer can protrude outward beyond the end of the display module.

[0015] The grid pattern may include: a plurality of first branches disposed between first holes adjacent to each other in a first direction and extending in a second direction; and a plurality of second branches disposed between first holes adjacent to each other in the second direction and extending in the first direction.

[0016] Each of the first branches may have a third width in the first direction, and the third width may be in the range of about 100 μm to about 200 μm.

[0017] Each of the second branches may have a fourth width in the second direction, and the fourth width may be in the range of about 121 μm to about 200 μm.

[0018] The first width can be approximately 5350 μm, the second width can be approximately 150 μm, and the third width can be approximately 100 μm.

[0019] When viewed in the second direction, each of the first branches can have a hexagonal shape in the sectional view.

[0020] When viewed in the second direction, the width of the upper surface of the first branch can be equal to the width of the lower surface of the first branch, and the width of the upper surface of the first branch can be less than the third width corresponding to the width of the central part of the first branch.

[0021] The first support layer may include a metallic material.

[0022] The first support layer may include: a first portion disposed below a first non-foldable region and extending from the grid pattern in a first direction; and a second portion disposed below a second non-foldable region and extending from the grid pattern in a first direction.

[0023] The center points of the first holes that are adjacent to each other in the first direction can be shifted in the second direction and spaced apart from each other.

[0024] The display device may further include a second support layer disposed below the first support layer, wherein the second support layer may include: a first plate overlapping the first non-foldable region; and a second plate overlapping the second non-foldable region and spaced apart from the first plate in a first direction.

[0025] The display device may also include a sub-covering layer disposed between the first support layer and the second support layer, and integrally folded or unfolded with the first support layer.

[0026] The display module can be folded inward so that when the display module is folded about the folding axis in the foldable region, the upper surfaces of the first non-foldable region and the second non-foldable region face each other.

[0027] The grid pattern may further define a plurality of second holes, which may be arranged in a first direction and a second direction and positioned between first holes that are adjacent to each other in the first direction, and the width of each second hole in the second direction may be less than the first width of each first hole in the second direction.

[0028] The grid pattern may include a plurality of first branches disposed between first holes adjacent to each other in a first direction and extending in a second direction, wherein second holes arranged in the second direction may be defined in each of the first branches, and the width of each first branch in the first direction may be greater than the second width of each first hole in the first direction.

[0029] The spacing between adjacent second holes in the second direction can be less than the first width of each first hole in the second direction.

[0030] The center points of the second holes that are adjacent to each other in the first direction can be set at the same position in the second direction.

[0031] According to one or more exemplary embodiments of the present invention, a display device includes: a display module having a first non-foldable region, a foldable region, and a second non-foldable region arranged in a first direction in an unfolded state; a first support layer disposed below the display module and having a grid pattern including a plurality of first holes, the plurality of first holes overlapping the foldable region of the display module; and a second support layer disposed below the first support layer and including a first plate disposed below the first non-foldable region and a second plate disposed below the second non-foldable region, the second plate being separate from the first plate, wherein: in the unfolded state, the first plate and the second plate overlap with the foldable region of the display module in a second direction intersecting the first direction, and in the folded state, the first plate and the second plate do not overlap with the foldable region of the display module in the second direction.

[0032] A plurality of first holes may be arranged in a first direction and a third direction intersecting the first direction, wherein: each of the first holes may have a first width in the third direction and a second width in the first direction, the first width being in the range of about 2000 μm to about 9000 μm, and the second width being in the range of about 100 μm to about 250 μm.

[0033] It should be understood that both the foregoing overview and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the claimed invention. Attached Figure Description

[0034] The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the invention and, together with the specification, serve to illustrate the inventive concept.

[0035] Figure 1 This is a perspective view of an exemplary embodiment of a display device constructed according to the principles of the present invention.

[0036] Figure 2 yes Figure 1 An exploded perspective view of the display device.

[0037] Figure 3 It is along Figure 1 A sectional view taken by line I-I'.

[0038] Figure 4 yes Figure 1 A cross-sectional view of the display panel of the display module of the display device.

[0039] Figure 5 yes Figure 1 A perspective view of the display device, showing the display device folded inwards.

[0040] Figure 6 It is along Figure 5 The sectional view taken from line II-II'.

[0041] Figure 7A yes Figure 2 An enlarged plan view of part A, which shows Figure 1 An example of the grid pattern of the first support layer of a display device.

[0042] Figure 7B yes Figure 2 An enlarged plan view of part B, which shows Figure 1 The grid pattern of the first support layer of the display device.

[0043] Figure 8 It is along Figure 7A The sectional view shown is taken from line III-III'.

[0044] Figures 9 to 11 It shows the basis Figure 7A A graph showing the observed effect of changes in the shape of the first hole in the grid pattern.

[0045] Figure 12 yes Figure 2 A plan view of part A, which shows Figure 1 Another example of the grid pattern of the first support layer of the display device. Detailed Implementation

[0046] In the following description, numerous specific details are set forth for illustrative purposes to provide a thorough understanding of various exemplary embodiments or implementations of the invention. As used herein, “implementation” and “method” are interchangeable terms and are non-limiting examples of apparatuses or methods employing one or more of the inventive concepts disclosed herein. However, it will be apparent that various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and apparatuses are shown in block diagram form to avoid unnecessarily obscuring the various exemplary embodiments. Furthermore, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, a particular shape, configuration, and characteristic of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0047] Unless otherwise stated, the exemplary embodiments shown should be understood as providing exemplary features of different details of some ways in which the inventive concept can be implemented in practice. Therefore, unless otherwise stated, features, components, modules, layers, films, panels, regions and / or aspects (hereinafter individually or collectively referred to as “elements”) of various embodiments may be combined, separated, interchanged and / or rearranged without departing from the inventive concept.

[0048] The use of crosshairs and / or shading in the accompanying drawings is generally to clarify the boundaries between adjacent elements. Therefore, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for a particular material, material properties, size, scale, commonalities between illustrated elements, and / or any other characteristics, properties, etc., of the elements. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of elements may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, the specific order of processes may be performed differently than the order described. For example, two consecutively described processes may be performed substantially simultaneously, or in the reverse order of their description. Furthermore, the same reference numerals denote the same elements.

[0049] When a component or layer is referred to as being "on," "connected to," or "attached to" another component or layer, it may be directly on, directly connected to, or attached to the other component or layer, or there may be an intermediate component or layer. However, when a component or layer is referred to as being "directly on," "directly connected to," or "directly attached to" another component or layer, there is no intermediate component or layer. Therefore, the term "connection" can refer to a physical connection, electrical connection, and / or fluid connection, with or without an intermediate component. Furthermore, the DR1, DR2, and DR3 axes are not limited to the three axes of a Cartesian coordinate system (such as the x, y, and z axes) and can be interpreted in a broader sense. For example, the DR1, DR2, and DR3 axes can be perpendicular to each other, or they can represent different directions that are not perpendicular to each other. For the purposes of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the set consisting of X, Y, and Z" can be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] Although the terms “first,” “second,” etc., may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Therefore, without departing from the teachings of this disclosure, the first element discussed below may be referred to as the second element.

[0051] Spatial relative terms such as “beneath,” “below,” “under,” “lower,” “above,” “upper,” “over,” “higher,” and “side” (e.g., as in “sidewall”) may be used herein for descriptive purposes and thus to describe the relationship of one element to another(s) as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, spatial relative terms are intended to cover different orientations of the device in use, operation, and / or manufacture. For example, if the device in the drawings is flipped, an element described as “below” or “under” other elements or features will then be oriented “above” other elements or features. Thus, the exemplary term “below” can cover both above and below orientations. Furthermore, the device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and thus the spatial relative descriptive terms used herein shall be interpreted accordingly.

[0052] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” as used herein are intended to also include the plural forms. Furthermore, when used in this specification, the terms “comprising,” “including,” “comprise,” and / or “including” indicate the presence of stated features, integrals, steps, operations, elements, components, and / or sets thereof, but do not preclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than terms of degree, and are therefore used to allow for inherent deviations in measurements, calculated values, and / or provided values ​​that will be recognized by those skilled in the art. Various exemplary embodiments are described herein with reference to cross-sectional and / or exploded views, which are schematic diagrams of idealized exemplary embodiments and / or intermediate structures. Therefore, deviations from the illustrated shapes will be expected due to, for example, manufacturing techniques and / or tolerances. Therefore, the exemplary embodiments disclosed herein should not necessarily be construed as being limited to the specific shape of the regions shown, but will include deviations in shape caused, for example, by manufacturing. In this way, the regions shown in the figures may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of the regions of the device, and are therefore not necessarily intended to be limiting.

[0053] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms, such as those defined in commonly used dictionaries, shall be interpreted as having the same meaning as they have in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0054] Figure 1 This is a perspective view of an exemplary embodiment of a display device DD constructed according to the principles of the present invention.

[0055] Reference Figure 1 According to an exemplary embodiment, the display device DD may have a rectangular shape defined by a long side extending in a first direction DR1 and a short side extending in a second direction DR2 intersecting the first direction DR1. However, the shape of the display device DD should not be limited to a rectangular shape, and the display device DD may have various shapes such as a circular shape or a polygonal shape.

[0056] In the following text, the direction substantially perpendicular to the plane defined by the first direction DR1 and the second direction DR2 may be referred to as the "third direction DR3". In the following description, the phrase "when viewed in the plane" means the state of being viewed in the third direction DR3.

[0057] The display device DD may include a first non-foldable region NFA1, a second non-foldable region NFA2, and a foldable region FA disposed between the first non-foldable region NFA1 and the second non-foldable region NFA2. The first non-foldable region NFA1, the second non-foldable region NFA2, and the foldable region FA may be arranged in a first direction DR1.

[0058] As an example, Figure 1 The diagram illustrates a foldable region FA and two non-foldable regions NFA1 and NFA2; however, the number of foldable regions FA and the number of non-foldable regions NFA1 and NFA2 should not be limited thereto or restricted by this. For example, the display device DD may include more than two non-foldable regions and multiple foldable regions disposed between the non-foldable regions.

[0059] The upper surface of the display device DD can be defined as the display surface DS, and can be a plane defined by a first direction DR1 and a second direction DR2. The image IM generated by the display device DD can be provided to the user through the display surface DS.

[0060] The display surface DS may include a display area DA and a non-display area NDA surrounding the display area DA. The display area DA may display an image IM, and the non-display area NDA may not display an image IM. The non-display area NDA may surround the display area DA and may be defined as an edge of the display device DD printed with a predetermined color.

[0061] Figure 2 yes Figure 1 Exploded perspective view of the display device DD Figure 3 It is along Figure 1 The sectional view taken by line I-I', and Figure 4 yes Figure 1 A cross-sectional view of the display panel of the display module of the display device. For ease of explanation, in Figure 2 Several adhesive layers are omitted.

[0062] Reference Figure 2 and Figure 3The display device DD according to an exemplary embodiment may include a display module DM, a first support layer SUP1, a sub-cover layer SCV, and a second support layer SUP2. The display module DM, the first support layer SUP1, the sub-cover layer SCV, and the second support layer SUP2 may be stacked sequentially on a third-direction DR3.

[0063] The display module DM can be a flexible display module. The display module DM includes a first non-foldable region NFA1, a foldable region FA, and a second non-foldable region NFA2 arranged in a first direction DR1.

[0064] The display module DM may include a display panel DP, an anti-reflective layer RPL, an impact-absorbing layer ISL, a window WIN, a window protective layer WP, a first coating CT1, a second coating CT2, a panel protective layer PPL, a cover layer CVL, and multiple adhesive layers. Each layer of the display module DM may include a first non-foldable region NFA1, a foldable region FA, and a second non-foldable region NFA2.

[0065] The anti-reflective layer RPL, the shock-absorbing layer ISL, the window WIN, the window protective layer WP, the first coating CT1, and the second coating CT2 can be set above the display panel DP.

[0066] An anti-reflective layer (RPL) can be disposed on the display panel (DP). The RPL can be an external light anti-reflective film. The RPL reduces the reflectivity of external light incident on the display panel (DP) from above the display device (DD). As an example, the RPL may include a retarder and / or a polarizer.

[0067] The thickness of the anti-reflective layer RPL on the third-direction DR3 can be greater than the thickness of the display panel DP on the third-direction DR3. For example, the thickness of the display panel DP on the third-direction DR3 can be approximately 30 μm, and the thickness of the anti-reflective layer RPL on the third-direction DR3 can be approximately 31 μm. However, the thickness of the anti-reflective layer RPL should not be limited to this or constrained by it. The thickness of the anti-reflective layer RPL can be less than the thickness of the display panel DP.

[0068] The first adhesive layer AL1 can be disposed between the anti-reflective layer RPL and the display panel DP. The anti-reflective layer RPL can be attached to the display panel DP through the first adhesive layer AL1. The thickness of the first adhesive layer AL1 on the third-direction DR3 can be less than the thickness of the display panel DP on the third-direction DR3. For example, the thickness of the first adhesive layer AL1 on the third-direction DR3 can be approximately 25 μm.

[0069] An impact absorbing layer (ISL) can be disposed on the anti-reflective layer (RPL). The ISL absorbs impacts applied to the display panel (DP) from the outside of the display device (DD). The ISL can comprise a flexible plastic material. For example, the ISL can comprise polyimide (PI) or polyethylene terephthalate (PET). The ISL can have an elastic modulus equal to or greater than about 1 GPa.

[0070] The thickness of the shock absorbing layer ISL on the third-direction DR3 can be greater than the thickness of the anti-reflective layer RPL on the third-direction DR3. As an example, the thickness of the shock absorbing layer ISL on the third-direction DR3 can be approximately 41 μm.

[0071] The first coating CT1 can be applied to the lower surface of the shock-absorbing layer ISL. The first coating CT1 may include a hard coating. The first coating CT1 can planarize the lower surface of the shock-absorbing layer ISL, which may be a curved surface.

[0072] A second adhesive layer AL2 can be disposed between the shock-absorbing layer ISL and the anti-reflective layer RPL. The shock-absorbing layer ISL and the anti-reflective layer RPL can be attached to each other through the second adhesive layer AL2. When viewed on a third-direction DR3, the thickness of the second adhesive layer AL2 can be less than the thickness of the anti-reflective layer RPL and equal to the thickness of the first adhesive layer AL1. As an example, the thickness of the second adhesive layer AL2 on the third-direction DR3 can be approximately 25 μm.

[0073] A window (WIN) can be disposed on the shock-absorbing layer (ISL). The window protects the display panel (DP) and the anti-reflective layer (RPL) from scratches. The image generated by the display panel (DP) can be provided to the user through the window. The window can have optically transparent properties. For example, the window can include glass material. In the exemplary embodiment shown, the window can be ultra-thin glass (UTG). However, the material of the window should not be limited to or restricted by this. For example, the window can include transparent plastic material.

[0074] A window WIN can have a single-layer or multi-layer structure. For example, a window WIN can include multiple synthetic resin films attached to each other by an adhesive, or it can include a glass substrate and a synthetic resin film attached to the glass substrate by an adhesive.

[0075] When viewed in a plane, the area of ​​the window WIN can be smaller than the area of ​​the display panel DP. Specifically, the opposing ends DP-E of the display panel DP in the first direction DR1 can protrude outwards beyond the opposing ends WIN-E of the window WIN in the first direction DR1. For example, each of the opposing ends DP-E of the display panel DP can protrude approximately 150 μm or more beyond the corresponding end WIN-E of the window WIN in the first direction DR1. For example, the opposing ends of the display panel DP in the second direction DR2 can protrude outwards beyond the opposing ends of the window WIN in the second direction DR2.

[0076] According to an exemplary embodiment, when the end WIN-E of the window WIN is disposed inside the end DP-E of the display panel DP, the window WIN can be effectively protected from external impacts acting on the display module DM.

[0077] The thickness of the window WIN on the third-direction DR3 can be less than the thickness of each of the shock absorbing layer ISL and the anti-reflective layer RPL, and can be equal to the thickness of the display panel DP. For example, the thickness of the window WIN on the third-direction DR3 can be approximately 30 μm.

[0078] A third adhesive layer AL3 can be disposed between the window WIN and the shock-absorbing layer ISL. The window WIN and the shock-absorbing layer ISL can be attached to each other through the third adhesive layer AL3. The thickness of the third adhesive layer AL3 can be greater than the thickness of the window WIN and less than the thickness of the shock-absorbing layer ISL. As an example, the thickness of the third adhesive layer AL3 on the third-direction DR3 can be approximately 35 μm.

[0079] When viewed in a plane, the area of ​​the third adhesive layer AL3 can be smaller than the area of ​​the window WIN. Specifically, the opposite ends WIN-E of the window WIN in the first direction DR1 can protrude outward beyond the opposite ends AL3-E of the third adhesive layer AL3 in the first direction DR1. For example, the opposite ends of the window WIN in the second direction DR2 can protrude outward beyond the opposite ends of the third adhesive layer AL3 in the second direction DR2.

[0080] According to an exemplary embodiment, when the end AL3-E of the third adhesive layer AL3 disposed below the window WIN is disposed inside the end WIN-E of the window WIN, the window WIN can be folded more easily. A window protective layer WP can be disposed on the window WIN. A second coating CT2 can be applied to the upper surface of the window protective layer WP. The window protective layer WP and the second coating CT2 can protect the window WIN.

[0081] The window protective layer WP may comprise a flexible plastic material such as polyimide or polyethylene terephthalate. The second coating CT2 may comprise a hard coating; however, exemplary embodiments are not limited thereto or thereby restrictive. The second coating CT2 may also comprise an anti-fingerprint layer or an anti-scattering layer serving as a functional layer.

[0082] The thickness of the window protective layer WP on the third-direction DR3 can be greater than the thickness of the shock absorbing layer ISL on the third-direction DR3. As an example, the thickness of the window protective layer WP on the third-direction DR3 can be approximately 55 μm.

[0083] A fourth adhesive layer AL4 can be disposed between the window protective layer WP and the window WIN. The window protective layer WP and the window WIN can be attached to each other through the fourth adhesive layer AL4. The thickness of the fourth adhesive layer AL4 on the third-direction DR3 can be less than the thickness of the window WIN on the third-direction DR3. As an example, the thickness of the fourth adhesive layer AL4 on the third-direction DR3 can be approximately 25 μm.

[0084] The panel protective layer (PPL) and the cover layer (CVL) can be disposed beneath the display panel (DP). The panel protective layer (PPL) can be disposed beneath the display panel (DP). The panel protective layer (PPL) can include a flexible material. For example, the panel protective layer (PPL) can include polyethylene terephthalate (PET).

[0085] The thickness of the panel protective layer PPL on the third-direction DR3 can be greater than the thickness of the display panel DP on the third-direction DR3. As an example, the thickness of the panel protective layer PPL on the third-direction DR3 can be approximately 50 μm.

[0086] A fifth adhesive layer AL5 can be disposed between the display panel DP and the panel protective layer PPL. The display panel DP and the panel protective layer PPL can be attached to each other through the fifth adhesive layer AL5. The thickness of the fifth adhesive layer AL5 can be less than the thickness of the display panel DP. As an example, the thickness of the fifth adhesive layer AL5 on the third-direction DR3 can be approximately 18 μm.

[0087] A cover layer CVL can be disposed below the panel protective layer PPL. The cover layer CVL can define the lower portion of the display module DM. The cover layer CVL can absorb external impacts applied to the lower portion of the display module DM. When viewed in a plane, the area of ​​the cover layer CVL can be smaller than the area of ​​the display panel DP. The opposing ends DP-E of the display panel DP in the first direction DR1 can protrude outward beyond the opposing ends of the cover layer CVL in the first direction DR1. For example, each of the opposing ends DP-E of the display panel DP can protrude about 200 μm or more beyond the corresponding end of the opposing end of the cover layer CVL in the first direction DR1. For example, the opposing ends of the display panel DP in the second direction DR2 can protrude outward beyond the opposing ends of the cover layer CVL in the second direction DR2.

[0088] The CVL (Continuous Cover Layer) may include a barrier layer (BRL) and a buffer layer (CUL). The barrier layer (BRL) may be positioned beneath the panel protective layer (PPL). The barrier layer (BRL) increases resistance to compressive forces caused by external pressure. As an example, the barrier layer (BRL) can prevent the display panel (DP) from deforming. The barrier layer (BRL) may include a flexible plastic material such as polyimide or polyethylene terephthalate.

[0089] A buffer layer CUL can be disposed below the barrier layer BRL. The buffer layer CUL can absorb external impacts applied to the lower portion of the display module DM and protect the display module DM. The buffer layer CUL may include a foam sheet with predetermined elasticity. The buffer layer CUL may include foam, sponge, polyurethane, or thermoplastic polyurethane. The buffer layer CUL can be formed directly on the lower surface of the barrier layer BRL, which serves as the base layer.

[0090] The thickness of the barrier layer BRL on the third-direction DR3 can be greater than the thickness of the display panel DP on the third-direction DR3 and less than the thickness of the panel protective layer PPL on the third-direction DR3. For example, the thickness of the barrier layer BRL on the third-direction DR3 can be approximately 35 μm. The thickness of the buffer layer CUL on the third-direction DR3 can be greater than the thickness of the panel protective layer PPL on the third-direction DR3. For example, the thickness of the buffer layer CUL on the third-direction DR3 can be approximately 100 μm.

[0091] At least one of the blocking layer BRL and the buffer layer CUL can have a color that absorbs light. For example, at least one of the blocking layer BRL and the buffer layer CUL can be black. In this case, when the display device DD is viewed in a plane, the components disposed below the cover layer CVL may not be visible.

[0092] A sixth adhesive layer AL6 can be disposed between the panel protective layer PPL and the barrier layer BRL. The panel protective layer PPL and the barrier layer BRL can be attached to each other through the sixth adhesive layer AL6. The thickness of the sixth adhesive layer AL6 on the third-direction DR3 can be less than the thickness of the display panel DP on the third-direction DR3, and greater than the thickness of the fifth adhesive layer AL5 on the third-direction DR3. For example, the thickness of the sixth adhesive layer AL6 on the third-direction DR3 can be approximately 25 μm.

[0093] Reference Figure 4 The display panel DP may include a substrate SUB, a circuit element layer CL disposed on the substrate SUB, a display element layer OL disposed on the circuit element layer CL, a thin film encapsulation layer TFE disposed on the display element layer OL, and an input sensing unit ISP disposed on the thin film encapsulation layer TFE.

[0094] The substrate SUB may include a display area DA and a non-display area NDA surrounding the display area DA. The substrate SUB may include a flexible plastic material. For example, the substrate SUB may include polyimide (PI).

[0095] The circuit element layer CL may include an insulating layer, semiconductor patterns, conductive patterns, and signal lines. The insulating layer, semiconductor layer, and conductive layer can be formed on a substrate SUB through coating and deposition processes, and then the insulating layer, semiconductor layer, and conductive layer can be selectively patterned through multiple photolithography processes. The semiconductor patterns, conductive patterns, and signal lines of the circuit element layer CL can then be formed.

[0096] The display element layer OL can be disposed on the display area DA. The display element layer OL may include light-emitting elements. For example, the display element layer OL may include organic light-emitting materials, quantum dots, quantum rods, or micro LEDs.

[0097] A thin-film encapsulation layer (TFE) can be disposed on the circuit element layer (CL) to cover the display element layer (OL). The TFE can include sequentially stacked inorganic, organic, and inorganic layers. The inorganic layer can include inorganic materials and can protect the pixels from moisture, oxygen, etc. The organic layer can include organic materials and can protect the pixels from foreign matter (such as dust particles).

[0098] The input sensing unit (ISP) may include multiple sensors to sense external input. Sensors can detect external input using capacitive methods. External input can include various inputs caused by a part of the user's body, light, heat, a pen, or pressure.

[0099] When manufacturing the display panel (DP), the input sensing unit (ISP) can be directly fabricated on the thin-film encapsulation layer (TFE). However, the input sensing unit (ISP) is not limited to this or is not restricted by it. The input sensing unit (ISP) can also be attached to the display panel (DP) via an adhesive layer after being manufactured separately from the display panel (DP).

[0100] Refer again Figures 2 to 3 The first support layer SUP1 can be disposed below the display module DM. For example, the first support layer SUP1 can be disposed below the buffer layer CUL of the cover layer CVL. The first support layer SUP1 can support the display module DM. In addition, the first support layer SUP1 can improve the heat dissipation performance of the display device DD.

[0101] The first support layer SUP1 may be a flexible layer. For example, the first support layer SUP1 may comprise a material having an elastic modulus of about 60 GPa or higher. The first support layer SUP1 may comprise a metallic material such as stainless steel. For example, the first support layer SUP1 may comprise SUS 304; however, exemplary embodiments are not limited thereto or thereby. The first support layer SUP1 may comprise a variety of metallic materials.

[0102] When viewed in a plane, the area of ​​the first support layer SUP1 can be larger than the area of ​​the display module DM. Specifically, the opposing ends SUP1-E of the first support layer SUP1 in the first direction DR1 can protrude outward beyond the opposing ends DP-E of the display panel DP in the first direction DR1. For example, each of the opposing ends SUP1-E of the first support layer SUP1 in the first direction DR1 can protrude outward beyond the corresponding end DP-E of the display panel DP in the first direction DR1 by approximately 150 μm or more. For example, the opposing ends of the first support layer SUP1 in the second direction DR2 can protrude outward beyond the opposing ends of the display panel DP in the second direction DR2.

[0103] According to an exemplary embodiment, since the edge portion of the first support layer SUP1 protrudes outward beyond the display module DM, the first support layer SUP1 can effectively protect the display module DM from external impacts applied to it from the outside of the display device DD.

[0104] The first support layer SUP1 may include a first portion PP1, a second portion PP2, and a grid pattern LT. The grid pattern LT may be disposed between the first portion PP1 and the second portion PP2. The first portion PP1, the second portion PP2, and the grid pattern LT may be integrally formed with each other. For example, each of the first portion PP1 and the second portion PP2 may extend from the grid pattern LT in a first direction DR1.

[0105] The first portion PP1 can be disposed below the first non-foldable region NFA1 and can support the first non-foldable region NFA1. The second portion PP2 can be disposed below the second non-foldable region NFA2 and can support the second non-foldable region NFA2. The grid pattern LT can be disposed below the foldable region FA. In the exemplary embodiment shown, the width of the grid pattern LT in the first direction DR1 can be in the range of about 8.65 mm to about 9.65 mm. However, the width of the grid pattern LT in the first direction DR1 is not limited to this or is not limited thereto.

[0106] The grid pattern LT may be provided with a plurality of first holes H1 formed therethrough. The first holes H1 may penetrate the first support layer SUP1 in the third direction DR3. The thickness of the first holes H1 in the third direction DR3 may be equal to the thickness of the first support layer SUP1. Due to the first holes H1, the grid pattern LT can be easily folded together with the display module DM in the foldable region FA. A detailed description of the first holes H1 defined as passing through the grid pattern LT will be given later.

[0107] The thickness of the first support layer SUP1 on the third-direction DR3 can be greater than the thickness of the buffer layer CUL of the cover layer CVL on the third-direction DR3. For example, the thickness of the first support layer SUP1 on the third-direction DR3 can be approximately 150 μm.

[0108] A seventh adhesive layer AL7 can be disposed between the buffer layer CUL and the first support layer SUP1. The buffer layer CUL and the first support layer SUP1 can be attached to each other through the seventh adhesive layer AL7. The thickness of the seventh adhesive layer AL7 on the third-direction DR3 can be less than the thickness of the fifth adhesive layer AL5 on the third-direction DR3. As an example, the thickness of the seventh adhesive layer AL7 on the third-direction DR3 can be approximately 8 μm.

[0109] A sub-cover layer SCV may be disposed below the first support layer SUP1. The sub-cover layer SCV may cover the first hole H1 defined as a grid pattern LT passing through the first support layer SUP1. The sub-cover layer SCV may be flexible. The elastic modulus of the sub-cover layer SCV may be less than the elastic modulus of the first support layer SUP1. For example, the sub-cover layer SCV may comprise thermoplastic polyurethane or rubber; however, the material of the sub-cover layer SCV is not limited to or is not restricted by these.

[0110] The sub-cover layer SCV can be manufactured in sheet form and can be attached to the first support layer SUP1. For example, an eighth adhesive layer AL8 can be provided between the sub-cover layer SCV and the first support layer SUP1. The sub-cover layer SCV and the first support layer SUP1 can be attached to each other through the eighth adhesive layer AL8. The sub-cover layer SCV can prevent foreign matter from entering the first hole H1 defined as a grid pattern LT passing through the first support layer SUP1.

[0111] The second support layer SUP2 may be disposed below the sub-cover layer SCV. The second support layer SUP2 may support the first non-foldable region NFA1 and the second non-foldable region NFA2 of the display module DM. Unlike the first support layer SUP1 and the sub-cover layer SCV, the second support layer SUP2 may be rigid. For example, the second support layer SUP2 may comprise the same material as the first support layer SUP1, such as stainless steel. However, exemplary embodiments are not limited thereto, and the second support layer SUP2 may comprise various metals, such as Invar.

[0112] The second support layer SUP2 may include a first plate PL1 and a second plate PL2 arranged in the first direction DR1. The first plate PL1 may be configured to overlap with and support the first non-foldable region NFA1. The second plate PL2 may be configured to overlap with and support the second non-foldable region NFA2. The first plate PL1 and the second plate PL2 may extend into the foldable region FA, but may be spaced apart from each other in the foldable region FA. For example, the distance between the first plate PL1 and the second plate PL2 in the first direction DR1 may be in the range of about 2.2 mm to about 2.6 mm.

[0113] The first plate PL1 and the second plate PL2 can be arranged adjacent to each other in the foldable region FA. The first plate PL1 and the second plate PL2 can support the grid pattern LT of the first support layer SUP1 (the first hole H1 is defined through it) in the foldable region FA. Therefore, when pressure is applied from above the grid pattern LT (the first hole H1 is defined through it), deformation of the grid pattern LT of the first support layer SUP1 (the first hole H1 is defined through it) can be prevented by the second support layer SUP2. In addition, the second support layer SUP2 can prevent the components disposed on it from being deformed by the components disposed below it.

[0114] A ninth adhesive layer AL9 may be disposed between the second support layer SUP2 and the sub-cover layer SCV. The second support layer SUP2 and the sub-cover layer SCV can be attached to each other through the ninth adhesive layer AL9. The ninth adhesive layer AL9 may be disposed in the region overlapping with the first non-foldable region NFA1 and the region overlapping with the second non-foldable region NFA2. The ninth adhesive layer AL9 may not be disposed in the region overlapping with the foldable region FA.

[0115] The second support layer SUP2 may also include a heat dissipation layer RHL and an insulating tape ITP. The heat dissipation layer RHL may be disposed below the first plate PL1 and the second plate PL2. The heat dissipation layer RHL may be a graphitized polymer film. For example, the polymer film may be a polyimide film.

[0116] The tenth adhesive layer AL10 can be disposed between the second plate PL2 and the heat dissipation layer RHL. The second plate PL2 and the heat dissipation layer RHL can be attached to each other through the tenth adhesive layer AL10.

[0117] An insulating tape ITP can be disposed below the heat dissipation layer RHL. The insulating tape ITP may include insulating material. An eleventh adhesive layer AL11 can be disposed between the insulating tape ITP and the heat dissipation layer RHL. The insulating tape ITP and the heat dissipation layer RHL can be attached to each other through the eleventh adhesive layer AL11.

[0118] The first adhesive layer AL1 to the eleventh adhesive layer AL11 may include transparent adhesives, such as pressure-sensitive adhesive (PSA) or optically transparent adhesive (OCA).

[0119] Figure 5 yes Figure 1 A perspective view of the display device DD, showing the display device DD in an inward-folded state, and Figure 6 It is along Figure 5 The sectional view taken from line II-II'.

[0120] Reference Figure 5 and Figure 6 The display device DD can be a foldable display device DD. For example, the display device DD can be folded about a folding axis FX that is substantially parallel to the second direction DR2.

[0121] When the display device DD is folded around the folding axis FX, the upper surfaces of the first non-foldable region NFA1 and the second non-foldable region NFA2 of the display module DM can face each other. Therefore, the display device DD can be folded inward (i.e., in the inward folded state), such that the display surface DS (reference) Figure 1 It is not exposed to the outside.

[0122] In the exemplary embodiment shown, the display device DD is folded about a folding axis FX extending in the second direction DR2; however, the exemplary embodiment is not limited to this or is not limited thereto. The display device DD can be folded in different ways. For example, the display device DD can be folded about a folding axis extending in the first direction DR1.

[0123] Because the display module DM is a flexible display module, the foldable area FA of the display module DM can be easily folded. The first support layer SUP1 and the sub-cover layer SCV located below the display module DM can be folded together with the display module DM.

[0124] The second support layer SUP2, located below the sub-cover layer SCV, is rigid and therefore can remain unfolded. When the ninth adhesive layer AL9 is applied to the foldable region FA, the first plate PL1 and the second plate PL2 of the second support layer SUP2 can be attached to the sub-cover layer SCV within the foldable region FA. When the first plate PL1 and the second plate PL2 are attached to the sub-cover layer SCV within the foldable region FA, the foldable region FA of the display module DM may be difficult to fold due to the first plate PL1 and the second plate PL2. Therefore, the display module DM may be difficult to fold. For example, in the unfolded state, the first plate PL1 and the second plate PL2 may overlap with the foldable region FA of the display module DM on a third direction DR3 intersecting the first direction DR1, and in the folded state, the first plate PL1 and the second plate PL2 may not overlap with the foldable region FA of the display module DM on the third direction DR3.

[0125] In an exemplary embodiment, the ninth adhesive layer AL9 may not be disposed in the area overlapping with the foldable region FA. Therefore, the portions of the first plate PL1 and the second plate PL2 that overlap with the foldable region FA are not attached to the display module DM, and thus, the foldable region FA of the display module DM can be easily folded.

[0126] The first support layer SUP1 can be easily folded together with the display module DM via a grid pattern LT that overlaps with the foldable region FA. When the first support layer SUP1 is folded, the first side S1 of the grid pattern LT can be deformed into a concave shape in the first direction DR1. The first side S1 can be the portion of the grid pattern LT adjacent to the folding axis FX. When the first support layer SUP1 is folded, compressive stress can act on the first side S1. Therefore, the portion of the first hole H1 adjacent to the first side S1 may be compressed.

[0127] When the first support layer SUP1 is folded, the second side S2 of the grid pattern LT can deform into a convex shape. The second side S2 can be opposite to the first side S1 and can be further away from the folding axis FX than the first side S1. When the first support layer SUP1 is folded, tensile stress can act on the second side S2. Therefore, the portion of the first hole H1 adjacent to the second side S2 may be stretched.

[0128] According to an exemplary embodiment, the display device DD can be unfolded to return to... Figure 1 The shape shown is given. In this case, the grid pattern LT can be restored to its original shape. The folding and unfolding operation of the display device DD can be repeated several times. Therefore, the grid pattern LT of the first support layer SUP1 needs to have appropriate stretching characteristics to facilitate the folding operation of the display device DD, and appropriate durability so as not to be damaged during repeated folding and unfolding operations.

[0129] Figure 7A yes Figure 2 An enlarged plan view of part A, which shows Figure 1 An example of the grid pattern of the first support layer of a display device. Figure 7A It is shown Figure 2 An enlarged plan view of the central part of the grid pattern LT.

[0130] Reference Figure 2 and Figure 7A The first hole H1 can be defined in a grid pattern LT. The first hole H1 can be arranged in a first direction DR1 and a second direction DR2. The grid pattern LT can include a plurality of first branches BR1 and a plurality of second branches BR2. The first branches BR1 can be disposed between adjacent first holes H1 in the first direction DR1. The first branches BR1 can be arranged in the first direction DR1. Each of the first branches BR1 can extend in the second direction DR2.

[0131] The second branch BR2 can be disposed between adjacent first holes H1 in the second direction DR2. The second branch BR2 can be arranged in the first direction DR1. The thickness of the central portion of each second branch BR2 can be less than the thickness of the edge of the second branch BR2. The edge of the second branch BR2 refers to the portion of the second branch BR2 adjacent to the first branch BR1. Therefore, the opposite ends of the first holes H1 in the second direction DR2 can have a convex shape.

[0132] Each of the second branches BR2 may extend in the first direction DR1. Each of the first holes H1 may be defined by two first branches BR1 that are adjacent to each other in the first direction DR1 and two second branches BR2 that are adjacent to each other in the second direction DR2.

[0133] The first hole H1 can be arranged in a zigzag pattern along the first direction DR1. Specifically, the center points of adjacent first holes H1 in the first direction DR1 can be spaced apart by alternating shifts in the second direction DR2. For example, when one of the odd-numbered first holes arranged in the first direction DR1 is called the first sample hole H1_O and one of the even-numbered first holes arranged in the first direction DR1 is called the second sample hole H1_E, the first sample hole H1_O and the second sample hole H1_E can be arranged adjacent to each other. The first center point C1 of the first sample hole H1_O can be spaced apart from the second center point C2 of the second sample hole H1_E in the second direction DR2. The first center point C1 and the second center point C2 can respectively define the center of the first sample hole H1_O and the center of the second sample hole H1_E.

[0134] Each of the first holes H1 may have a first width W1 and a second width W2. The first width W1 may be the width of the first hole H1 in the second direction DR2. The second width W2 may be the width of the first hole H1 in the first direction DR1.

[0135] The first width W1 can be in the range of about 2000 μm to about 9000 μm, and preferably in the range of about 3500 μm to about 6000 μm. In the exemplary embodiment shown, the first width W1 can be about 5350 μm.

[0136] The second width W2 can be in the range of about 100 μm to about 250 μm, and preferably in the range of about 100 μm to about 200 μm. In the exemplary embodiment shown, the second width W2 can be about 150 μm.

[0137] Each of the first branches BR1 may have a third width W3 in the first direction DR1. The third width W3 may indicate the spacing between adjacent first holes H1 in the first direction DR1. The third width W3 may be the maximum width of the first branch BR1 in the first direction DR1. The third width W3 may be in the range of about 100 μm to about 200 μm, and preferably in the range of about 93 μm to about 180 μm. In the exemplary embodiment shown, the third width W3 may be about 100 μm.

[0138] Each of the second branches BR2 may have a fourth width W4 in the second direction DR2. The fourth width W4 may indicate the spacing distance between adjacent first holes H1 in the second direction DR2. The fourth width W4 may be in the range of about 121 μm to about 200 μm. In the exemplary embodiment shown, the fourth width W4 may be about 200 μm.

[0139] Figure 7B yes Figure 2 An enlarged plan view of part B, which shows Figure 1 The grid pattern of the first support layer of the display device. Figure 7B It is shown Figure 2 A magnified plan view of the edge of the grid pattern LT.

[0140] Reference Figure 2 and Figure 7B The grid pattern LT may include multiple extension branches EXB. The extension branches EXB may be positioned adjacent to the opposite end of the first branch BR1 in the second direction DR2. The extension branches EXB may be arranged in the first direction DR1. Each of the extension branches EXB may extend in the second direction DR2. The extension branches EXB may be spaced apart from each other in the first direction DR1.

[0141] In detail, each of the extension branches EXB can extend from two first branches BR1 adjacent to each other in the first direction DR1. The width of each extension branch EXB in the first direction DR1 can be greater than the third width W3 of the first branch BR1 and the second width W2 of the first hole H1. For example, the width of each extension branch EXB in the first direction DR1 can be substantially the same as the sum of the width of the two first branches BR1 arranged in the first direction DR1 (i.e., twice the width of the third width W3) and the width of the first hole H1 (i.e., the second width W2).

[0142] Figure 7B Only the extended branch EXB arranged at one end of the grid pattern LT is shown; however, the exemplary embodiment is not limited to this, and the extended branch EXB may be arranged at the other end of the grid pattern LT.

[0143] Figure 8 It is along Figure 7A The sectional view shown is taken from line III-III'. Figure 8 The diagram shows the first branch BR1, which is adjacent to each other when viewed in the second direction DR2, and the first hole H1, which is defined between the first branch BR1.

[0144] Reference Figure 8Each of the first branches BR1 has a hexagonal shape in the cross-sectional view. Specifically, the first branch BR1 may include an upper surface UF and a lower surface BF. The upper surface UF and the lower surface BF may be substantially parallel to the first direction DR1. The upper surface UF may have a fifth width W5 in the first direction DR1. The fifth width W5 may be less than the third width W3. The ratio of the fifth width W5 to the third width W3 may be variable. For example, the ratio of the fifth width W5 to the third width W3 may be greater than or equal to about 0.4 and less than about 1. As the ratio of the fifth width W5 to the third width W3 increases, the stress acting on the grid pattern LT may increase during folding and unfolding operations. The fifth width W5 may be in the range of about 40 μm to about 150 μm. In the exemplary embodiment shown, the fifth width W5 may be about 40 μm.

[0145] However, the shape of the first branch BR1 is not limited to this or not restricted by it. For example, when the ratio of the fifth width W5 to the third width W3 is approximately 1, the third width W3 and the fifth width W5 can be substantially the same as each other. In this case, each first branch BR1 can have a rectangular shape in the sectional view.

[0146] Figures 9 to 11 It shows the basis Figure 7A A graph showing the observed effect of changes in the shape of the first hole in the grid pattern. Figures 9 to 11 In the diagram, the stress acting on the mesh pattern LT is indicated by dashed lines, the visibility of the mesh pattern LT is represented by solid lines, and the resistance of the mesh pattern LT is indicated by thick solid lines. Figures 9 to 11 In this diagram, the x-axis is in micrometers (μm). Furthermore, the y-axis represents relative values ​​based on the assumption that the value is 1 at a specific point in time.

[0147] Stress refers to the load acting on the grid pattern LT when the display device DD is folded. More specifically, stress can be the load acting on... Figure 6 The tensile stress on the second side S2 shown. As the stress acting on the grid pattern LT decreases, the folding and unfolding operation of the display device DD can be easily performed.

[0148] Visibility refers to the degree to which the grid pattern LT is observed when the display device DD is viewed in a plane. Lower visibility is better, because the grid pattern LT is preferably not observed by the user.

[0149] Resistance refers to the property of a grid pattern LT to resist external forces and maintain its original shape. In other words, resistance refers to the durability of the grid pattern LT. For example, the external force can be gravity or the pressure generated when a user touches the display device DD. When the resistance is too low, the grid pattern LT may dent when the display device DD is in the unfolded state.

[0150] Figure 9 The variations in stress, visibility, and resistance with respect to the first width W1 are shown. Figure 9 In this context, it is assumed that when the first width W1 is zero (0), the stress and resistance are one (1).

[0151] Reference Figure 7A and Figure 9 Regarding stress, the stress can decrease as the first width W1 increases. This is because... Figure 7A The deformable range of the first hole H1 shown in the first direction DR1 is proportional to the first width W1. (Refer to...) Figure 9 When the first width W1 is approximately 4000 μm, the stress can be approximately 0.2. In other words, when the first width W1 is approximately 4000 μm, the stress may be reduced by approximately 80%.

[0152] Regarding resistance, resistance may decrease as the first width W1 increases. That is, as the first width W1 increases, the grid pattern LT may easily deform due to external forces. When the first width W1 is too large, the grid pattern LT of the first support layer SUP1 may dent downwards in the unfolded state of the display device DD. In this case, the first support layer SUP1 may not be able to properly perform its function of supporting the display module DM. Therefore, in the exemplary embodiment shown, the first width W1 may be equal to or less than about 9000 μm.

[0153] Regarding visibility, even if the first width W1 is changed, the visibility may not change significantly.

[0154] Therefore, the first width W1 is preferably small in terms of stress, but considering the predetermined resistance, ease of manufacturing process, and process tolerance, the first width W1 needs to be at least a predetermined width. The first width W1 can be in the range of about 2000 μm to about 9000 μm, preferably in the range of about 3500 μm to about 6000 μm. In the exemplary embodiment shown, the first width W1 can be about 5350 μm.

[0155] Figure 10 The variations in stress, visibility, and resistance with respect to the second width W2 are shown. Figure 10 In this context, it is assumed that when the second width W2 is 500 μm, the resistance and visibility are equal (1), and the stress has a maximum value. Figure 10 In the second width W2, the second width is greater than zero (0), and there are no restrictions on stress, visibility and resistance when the second width W2 is zero (0).

[0156] Reference Figure 7A and Figure 10Regarding stress, the stress can decrease as the second width W2 decreases. This is because when the second width W2 (which is the width of the first hole H1 in the first direction DR1) decreases, a larger number of first holes H1 can be defined in the mesh pattern LT with a specific region, and because as the number of first holes H1 increases, the stress acting on the mesh pattern LT can be distributed more evenly.

[0157] Regarding visibility, visibility can decrease as the second width W2 decreases. This is because as the second width W2 decreases, the size of the first hole H1 gradually decreases.

[0158] Regarding resistance, resistance can decrease as the second width W2 decreases. This is because, in the grid pattern LT, the area of ​​the first branch BR1 and the area of ​​the second branch BR2 decrease as the number of first holes H1 increases.

[0159] Therefore, the second width W2 is preferably smaller in terms of stress and visibility; however, to ensure the predetermined resistance and considering the ease of manufacturing and process errors, the second width W2 needs to be at least a predetermined width. The second width W2 can range from about 100 μm to about 250 μm, preferably from about 100 μm to about 200 μm. In the exemplary embodiment shown, the second width W2 can be about 150 μm.

[0160] Figure 11 The variations in stress, visibility, and resistance according to the third width W3 are shown. Figure 11 In this context, it is assumed that the stress is -1 when the third width W3 is 300 μm. Figure 11 In the third width W3, the third width is greater than zero (0), and there are no restrictions on stress, visibility and resistance when the third width W3 is zero (0).

[0161] Reference Figure 7A and Figure 11 Regarding stress, the stress can decrease as the third width W3 decreases. This is because as the third width W3 of the first branch BR1 decreases in the first direction DR1, it causes the mesh pattern LT to deform and the stress to be uniformly distributed to the first branch BR1.

[0162] Regarding visibility, visibility can decrease as the third width W3 increases. This is because it increases the proportion of external light blocked by the first branch BR1.

[0163] Regarding resistance, resistance can decrease as the third width W3 increases. This is because when the third width W3 of the first branch BR1 decreases in the first direction DR1, cracks are generated in the mesh pattern LT or the mesh pattern LT breaks.

[0164] Therefore, in terms of stress, the third width W3 is preferably small, but considering visibility, resistance, and process tolerance, the third width W3 needs to be at least a predetermined width. The third width W3 can be in the range of about 100 μm to about 200 μm, preferably in the range of about 93 μm to about 180 μm. In the exemplary embodiment shown, the third width W3 can be about 100 μm.

[0165] According to an exemplary embodiment, the first width W1, the second width W2, and the third width W3 of the grid pattern LT can have values ​​within the above-mentioned range. Considering suitability for a foldable display device DD (reference...) Figure 1 The stretching properties and durability of the grid pattern LT can be measured within a range derived from experimental data. Therefore, the first support layer SUP1 (reference...) Figure 2 It can have stretch characteristics suitable for foldable display devices (DD) and can have appropriate durability so as not to be damaged during repeated folding and unfolding operations.

[0166] Figure 12 yes Figure 2 A plan view of part A, which shows Figure 1 Another example of the grid pattern of the first support layer of the display device. Figure 12 It shows the relationship with Figure 7A The grid pattern LT shown has a different shape than the grid pattern LT-1. Figure 12 In this drawing, the same reference numerals denote the same elements as those in the embodiments described above, and therefore, detailed descriptions of the same elements will be omitted, and the different features will be described primarily.

[0167] Reference Figure 12 Multiple first holes H1 and multiple second holes H2 can be defined by a grid pattern LT-1. The second holes H2 can be arranged in a first direction DR1 and a second direction DR2. Specifically, the second holes H2 arranged in the first direction DR1 can be positioned between adjacent first holes H1 in the first direction DR1. The second holes H2 arranged in the second direction DR2 can be defined by a first branch BR1-1.

[0168] In the exemplary embodiment shown, the sixth width W6 of the first branch BR1-1 in the first direction DR1 can be larger than that in the embodiment described above (see reference). Figure 7A and Figure 7B The third width W3. The sixth width W6 can be greater than the second width W2 of the first hole H1.

[0169] The second hole H2 may have a seventh width W7 in the second direction DR2. The seventh width W7 may be smaller than the first width W1. For example, the seventh width W7 may be equal to or greater than about 2000 μm and smaller than the first width W1. The spacing D1 between adjacent second holes H2 in the second direction DR2 may be smaller than the first width W1.

[0170] The second holes H2 can be arranged substantially parallel to each other in the first direction DR1. For example, the center points of the second holes H2 that are adjacent to each other in the first direction DR1 can be set at the same position in the second direction DR2.

[0171] Therefore, the first hole H1 can be arranged in a zigzag shape along the first direction DR1 in the grid pattern LT-1, and the second hole H2 can be arranged substantially parallel to each other in the first direction DR1. As described above, since the first hole H1 and the second hole H2 (whose width in the second direction DR2 is different from the width of the first hole H1 in the second direction DR2) are arranged asymmetrically in the grid pattern LT-1, the grid pattern LT-1 can have stretch characteristics suitable for the foldable display device DD.

[0172] According to the exemplary embodiment shown, the durability of the mesh pattern LT-1 can be improved when the sixth width W6 of the first branch BR1-1 of the mesh pattern LT-1 is designed to be greater than the second width W2 of the first hole H1.

[0173] Although exemplary embodiments of the invention have been described, it should be understood that the invention is not limited to these exemplary embodiments, but can be modified and altered by those skilled in the art within the spirit and scope of the invention as claimed herein. Therefore, the disclosed subject matter should not be limited to any single embodiment described herein, and the scope of the inventive concept should be determined by the appended claims.

Claims

1. A display device comprising: a display module having a first non-foldable area, a foldable area, and a second non-foldable area arranged in a first direction in an unfolded state; and a first support layer disposed below the display module and having a mesh pattern including a plurality of first holes overlapping the foldable area, wherein the first holes are arranged in the first direction and a second direction intersecting the first direction, and wherein: wherein each of the first holes has a first width in the second direction and a second width in the first direction, wherein the mesh pattern includes: a plurality of first branches disposed between the first holes adjacent to each other in the first direction and extending in the second direction; and a plurality of second branches disposed between the first holes adjacent to each other in the second direction and extending in the first direction, wherein each of the first branches has a third width in the first direction and each of the second branches has a fourth width in the second direction, and wherein the first width is greater than the fourth width; wherein the mesh pattern further includes a plurality of extension branches disposed adjacent to end portions of the first branches in the second direction, arranged in the first direction, extending in the second direction, and spaced apart from each other in the first direction, wherein a plurality of holes are defined between the extension branches, the holes being disposed between the first holes and open toward both end portions of the mesh pattern and longer than the first holes in the second direction. End portions of the first support layer protrude outward beyond end portions of the display module.

2. The display device according to claim 1, wherein The first width is 5,500 μm and the second width is 150 μm.

3. The display device according to claim 1, wherein The third width is 100 μm and the fourth width is 200 μm.

4. The display device of claim 3, wherein: The first width has a value in a range of 2,000 μm to 9,000 μm and the second width has a value in a range of 100 μm to 250 μm.

5. The display device according to claim 1, wherein The third width has a value in a range of 100 μm to 200 μm and the fourth width has a value in a range of about 121 μm to about 200 μm.

6. The display device of claim 5, wherein, Each of the first branches has a hexagonal shape in a cross-sectional view when viewed in the second direction.

7. The display device according to claim 1, wherein A width of an upper surface of the first branch is equal to a width of a lower surface of the first branch when viewed in the second direction, and the width of the upper surface of the first branch is less than a third width corresponding to a width of a central portion of the first branch.

8. The display device of claim 7, wherein, The first support layer includes a metallic material.

9. The display device according to claim 1, wherein The first support layer includes:

10. The display device according to claim 1, wherein a first portion disposed below the first non-foldable area and extending from the mesh pattern in the first direction; and a second portion disposed below the second non-foldable area and extending from the mesh pattern in the first direction. ​ 11. The display device according to claim 1, wherein The center points of the first holes adjacent to each other in the first direction are displaced in the second direction and spaced apart from each other.

12. The display device according to claim 1, further comprising a second support layer provided below the first support layer, wherein, The second support layer comprises: a first plate overlapping the first non-foldable area; and a second plate overlapping the second non-foldable area and spaced apart from the first plate in the first direction.

13. The display device of claim 12, further comprising a sub-cover layer disposed between the first support layer and the second support layer and folded or unfolded integrally with the first support layer.

14. The display device of claim 1, wherein, The display module is folded inwardly such that upper surfaces of the first non-foldable area and the second non-foldable area face each other when the display module is folded about the folding axis in the foldable area.

15. The display device of claim 1, wherein, A plurality of second holes are further defined in the grid pattern, the second holes are arranged in the first direction and the second direction and are disposed between the first holes adjacent to each other in the first direction, and Each of the second holes has a width in the second direction that is less than the first width of each of the first holes in the second direction.

16. The display device of claim 15, wherein, The grid pattern comprises a plurality of branches disposed between the first holes adjacent to each other in the first direction and extending in the second direction, the second holes arranged in the second direction are defined in each of the branches, and each of the branches has a width in the first direction that is greater than the second width of each of the first holes in the first direction.

17. The display device of claim 15, wherein, The spacing distance between the second holes adjacent to each other in the second direction is less than the first width of each of the first holes in the second direction.

18. The display device of claim 15, wherein, A straight line connecting the center points of the second holes adjacent to each other in the first direction is parallel to the first direction.

19. The display device of claim 1, wherein, The plurality of extended branches are disposed adjacent to opposite ends of the first branches in the second direction, and Each of the extended branches extends from two first branches adjacent to each other in the first direction.

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