Display devices

Abstract

This application relates to a display device. The display device includes a display panel and a lower component. The lower component includes a first support layer, a second support layer, and a cover layer. The first support layer includes a first support portion, a first protective portion extending from the first support portion, and at least one of a first groove and a first opening in the regions of the first support portion and the first protective portion. The second support layer includes a second support portion, a second protective portion, and at least one of a second groove and a second opening in the regions of the second support portion and the second protective portion. The cover layer is attached to the first and second support layers and corresponds to a first non-folding region, a second non-folding region, and a folding region.

Description

Technical Field

[0001] This disclosure relates to foldable display devices. Background Technology

[0002] A display device includes a display area that is activated by an electrical signal applied thereto. The display device senses input provided from the outside through the display area and provides image information to the user through the display area. As display devices with various shapes have been developed, display areas have also evolved into various shapes. To improve user portability and space efficiency, much research is underway to develop display devices with changeable shapes.

[0003] It should be understood that the background section of this technical section is partly intended to provide useful context for understanding the technology. However, the background section may also include ideas, concepts, or knowledge that were not known or understood by a person skilled in the art prior to the relevant valid application date of the subject matter disclosed herein. Summary of the Invention

[0004] The implementation provides a foldable display device with improved reliability.

[0005] According to an embodiment, the display device may include a display panel and a lower component. The display panel may include a first non-folding region, a second non-folding region, and a folding region, with the folding region disposed between the first and second non-folding regions in a first direction. The lower component may be disposed below the display panel and may include a first support layer, a second support layer, and a cover layer. The first support layer may include a first support portion corresponding to the first non-folding region, a first protective portion extending from the first support portion and corresponding to the folding region, and at least one of a first groove and a first opening in a first region of the first support portion adjacent to the first protective portion and in a first region of the first protective portion adjacent to the first support portion. The second support layer may include a second support portion corresponding to the second non-folding region, a second protective portion extending from the second support portion and corresponding to the folding region, and at least one of a second groove and a second opening in a first region of the second support portion adjacent to the second protective portion and in a first region of the second protective portion adjacent to the second support portion. The cover layer may be disposed below and attached to the first and second support layers and may correspond to the first non-folding region, the second non-folding region, and the folding region.

[0006] In one embodiment, multiple first grooves may be provided in the first region of the first support portion and the first region of the first protective portion. The first grooves may be spaced evenly apart from each other in a first direction.

[0007] In one implementation, the multiple first grooves may have the same width.

[0008] In one embodiment, multiple first openings may be provided in the first region of the first support portion and the first region of the first protection portion. The multiple first openings may be configured in a grid shape or a lattice shape.

[0009] In one embodiment, the first protective portion may include a second region adjacent to the first region of the first protective portion. The second region of the first protective portion may have an elastic modulus greater than that of the first region of the first protective portion.

[0010] In one embodiment, the second region of the first protective portion may have a uniform thickness in the first direction.

[0011] In this embodiment, the first support layer and the second support layer may comprise stainless steel or Invar alloy.

[0012] In an implementation, the covering layer may have an elastic modulus that is smaller than that of the first support layer.

[0013] In an embodiment, the covering layer may include a buffer layer, which may include a foam resin layer or an organosilicon resin layer.

[0014] In one embodiment, the covering layer may include a plastic resin layer disposed on the surface of the buffer layer.

[0015] In one embodiment, the cover layer may include a heat dissipation layer disposed on the surface of the buffer layer, and the heat dissipation layer may have a higher thermal conductivity than the buffer layer.

[0016] In one embodiment, the lower member may include a first adhesive layer attached to the top surface of the first support portion and a second adhesive layer attached to the top surface of the second support portion. The first adhesive layer and the second adhesive layer may be spaced apart from each other in a first direction.

[0017] In one embodiment, when the display device is in the unfolded state, the distance between the first adhesive layer and the second adhesive layer corresponds to the width of the folded area.

[0018] In one embodiment, the lower component may include a panel protective layer and a buffer layer. The panel protective layer is disposed between the display panel and the first support layer and between the display panel and the second support layer, and the buffer layer is disposed between the panel protective layer and the first support layer and between the panel protective layer and the second support layer.

[0019] In one embodiment, the lower component may include a first adhesive layer for attaching a first support portion to the cover layer and a second adhesive layer for attaching a second support portion to the cover layer. The first adhesive layer and the second adhesive layer may be spaced apart from each other in a first direction.

[0020] In this implementation, the cover layer may include a first cover area corresponding to the folded area and a second cover area corresponding to the first non-folded area. When the display panel is in the unfolded state, the distance between the first cover area and the display panel may be greater than the distance between the second cover area and the display panel.

[0021] In this implementation, the cover layer may include a first cover area corresponding to the folded area and a second cover area corresponding to the first non-folded area. When the display panel is in the unfolded state, the distance between the first cover area and the display panel may be greater than the distance when the display panel is in the folded state.

[0022] In this embodiment, when the display panel is in the unfolded state, the first covered area of ​​the cover layer can be spaced apart from the first protective portion of the first support layer. When the display panel is in the folded state, the first covered area of ​​the cover layer can contact the first protective portion of the first support layer.

[0023] According to an embodiment, the display device may include a display panel and a lower component. The display panel may include a first non-folding region, a second non-folding region, and a folding region, with the folding region disposed in a first direction between the first and second non-folding regions. The lower component may be disposed below the display panel and may include a first support layer, a second support layer, and a cover layer. The first support layer may include a first support portion corresponding to the first non-folding region and a first protective portion extending from the first support portion and corresponding to the folding region. The second support layer may include a second support portion corresponding to the second non-folding region and a second protective portion extending from the second support portion and corresponding to the folding region. The second support layer may be spaced apart from the first support layer. The cover layer may be disposed below and attached to the first and second support layers and may correspond to the first non-folding region, the second non-folding region, and the folding region. The first protective portion may include a first region and a second region, the first region including at least one of a first groove and a first opening, and the second region not including the first groove or the first opening. The second protective portion may include the first region and the second region, the first region including at least one of a second groove and a second opening, and the second region not including the second groove or the second opening. The second region of the first protection part may be closer to the second region of the second protection part than the first region of the first protection part.

[0024] In one embodiment, a third groove or a third opening may be provided in the region of the first support portion adjacent to the first protective portion. A fourth groove or a fourth opening may be provided in the region of the second support portion adjacent to the second protective portion. Attached Figure Description

[0025] The above and other aspects and features of this disclosure will become clearer from a detailed description of embodiments thereof with reference to the accompanying drawings, wherein:

[0026] Figure 1A and Figure 1B This is a schematic perspective view showing an electronic device according to an embodiment.

[0027] Figure 2A This is a schematic cross-sectional view of a display device according to an embodiment.

[0028] Figure 2B This is a schematic plan view showing a display panel according to an embodiment.

[0029] Figure 3A This is a schematic cross-sectional view showing a display device according to an embodiment.

[0030] Figure 3B This is an enlarged schematic cross-sectional view showing a portion of a display device in an unfolded state according to an embodiment.

[0031] Figure 3C This is an enlarged schematic cross-sectional view showing a portion of a display device in a folded state according to an embodiment.

[0032] Figure 4A This is a schematic plan view showing the support layer according to an embodiment.

[0033] Figure 4B It is shown Figure 4A An enlarged schematic plan view of a portion of the support layer.

[0034] Figure 4C and Figure 4D Each of these shows a schematic cross-sectional view of the cover layer according to an embodiment.

[0035] Figure 5A and Figure 5B This is an enlarged schematic cross-sectional view showing a portion of a display device according to an embodiment.

[0036] Figure 6A This is a schematic plan view showing the support layer according to an embodiment.

[0037] Figure 6B It is shown Figure 6AAn enlarged schematic plan view of a portion of the support layer.

[0038] Figure 6C This shows the settings within. Figure 6A and Figure 6B An enlarged schematic cross-sectional view of a portion of the support layer of the display device.

[0039] It should be noted that these figures are intended to illustrate the general characteristics of the methods, structures, and / or materials used in some embodiments and to supplement the written description provided below. However, these figures are not drawn to scale and may not precisely reflect the exact structural or performance characteristics of any given embodiment, and should not be construed as limiting or restricting the range of values ​​or characteristics covered by the embodiments. Detailed Implementation

[0040] This disclosure will now be described more fully with reference to the accompanying drawings, in which embodiments are illustrated. However, this disclosure may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0041] In the accompanying drawings, for ease of description and clarity, the dimensions, thickness, ratios, and sizes of the components may be exaggerated. The same numbers always refer to the same component.

[0042] It should be understood that when an element is referred to as “connected” or “linked” to another element, it can be directly connected to or linked to another element, or there may be an intermediate element. Conversely, when an element is referred to as “directly connected” or “directly linked” to another element, there is no intermediate element. The same numbers always refer to the same element. As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items. Other terms used to describe relationships between elements or layers should be interpreted in a similar manner (e.g., “between” vs. “directly between”, “adjacent” vs. “directly adjacent”, “on” vs. “directly on”).

[0043] It should be understood that although the terms "first," "second," etc., may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, without departing from the teachings of the embodiments, the first element, first component, first region, first layer, or first portion discussed below may be referred to as a second element, second component, second region, second layer, or second portion.

[0044] For ease of description, spatial relative terms such as “below,” “under,” “lower,” “above,” “upper,” etc., may be used herein to describe the relationship between one element or feature and another element (or feature) or feature (or feature) as shown in the figures. It should be understood that, in addition to the orientation depicted in the figures, spatial relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, the element described as “below” or “under” other elements or features will subsequently be oriented “above” other elements or features. Therefore, the term “below” can encompass both above and below orientations. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein should be interpreted accordingly.

[0045] The terminology used herein is for descriptive purposes only and is not intended to limit the implementation. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that, if used herein, the terms “comprises,” “comprising,” “includes,” and / or “including” specify the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0046] The term "overlap" or "overlapped" means that the first object may be above or below the second object, or on one side of the second object, and the second object may be above or below the first object, or on one side of the first object. Additionally, the term "overlap" may include layer, stack, face or facing, extend over, cover or partially cover, or any other suitable term that will be understood and appreciated by one of ordinary skill in the art.

[0047] In this specification, the phrase "one region or part corresponds to another region or part" will be used to indicate that they overlap with each other, but they are not necessarily limited to the same region.

[0048] This document describes embodiments with reference to cross-sectional views, which are schematic diagrams of idealized implementations (and intermediate structures). Similarly, variations in the shapes shown in the figures should be expected, for example, due to manufacturing techniques and / or tolerances. Therefore, embodiments should not be construed as limited to the shapes of the areas shown herein, but should include, for example, deviations in shape due to manufacturing processes.

[0049] Unless otherwise defined, 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 embodiment pertains. It should also be understood that terms, such as those defined in common dictionaries, shall be interpreted as having the meaning consistent with their meaning in the context of the relevant field, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0050] Figure 1A and Figure 1B This is a schematic perspective view showing a display device DD according to an embodiment. Figure 1A The expanded state of the display device DD is shown, and Figure 1B The folded state of the display device DD is shown.

[0051] Reference Figure 1A and Figure 1B The display device DD may include a display surface DS, which is defined by two different directions (e.g., a first direction DR1 and a second direction DR2). The display device DD can provide an image IM to the user through the display surface DS.

[0052] The display surface DS may include a display area DA and a non-display area NDA surrounding or near the display area DA. The display area DA may display an image IM, while the non-display area NDA may not be used to display the image IM. The non-display area NDA may surround the display area DA. However, the implementation is not limited to this, and in the implementation, the shape of the display area DA and the shape of the non-display area NDA may be changed differently.

[0053] In the following text, the direction perpendicular to both the first direction DR1 and the second direction DR2 will be referred to as the third direction DR3. Furthermore, the phrase "when viewed in a plan view" in the specification will be used to describe the structure viewed from the third direction DR3. In the following text, the first direction DR1, the second direction DR2, and the third direction DR3 can be directions represented by the first direction axis to the third direction axis, and will be identified using the same reference numerals.

[0054] The display device DD may include a folded region FA, a first non-folded region NFA1, and a second non-folded region NFA2. In the second direction DR2, the folded region FA may be located between the first non-folded region NFA1 and the second non-folded region NFA2.

[0055] like Figure 1BAs shown, the folding region FA can be folded along a folding axis FX parallel to the first direction DR1. The folding region FA can have a curvature and a radius of curvature R1. The display device DD can be folded in an inward folding manner, such that the first non-folding region NFA1 faces the second non-folding region NFA2, and the display surface DS is not exposed to the outside.

[0056] In one embodiment, the display device DD can be folded externally, exposing the display surface DS to the outside. In another embodiment, the display device DD can repeatedly perform unfolding and internal folding operations, or repeated unfolding and external folding operations.

[0057] like Figure 1B As shown, the distance between the first non-folded region NFA1 and the second non-folded region NFA2 can be substantially equal to twice the radius of curvature R1, but the implementation is not limited to this. Although not shown, the distance between the first non-folded region NFA1 and the second non-folded region NFA2 can be less than twice the radius of curvature R1. In the implementation, the distance between the first non-folded region NFA1 and the second non-folded region NFA2 can decrease as the distance from the folded region FA increases.

[0058] Figure 2A This is a schematic cross-sectional view of a display device DD according to an embodiment. Figure 2B This is a schematic plan view of the display panel DP according to the embodiment. Figure 2A It shows along Figure 1A The cross section intercepted by line I-I'.

[0059] like Figure 2A As shown, the display device DD may include a display panel DP, an input sensor IS disposed on the display panel DP, an anti-reflective component LF disposed on the input sensor IS, a window module WM disposed on the anti-reflective component LF, and a lower component LM disposed below the display panel DP. If necessary, an adhesive layer may be provided between the components.

[0060] The display panel (DP) may include a base layer, a circuitry layer disposed on the base layer, a display device layer disposed on the circuitry layer, and a thin encapsulation layer disposed on the display device layer. The base layer may include a plastic film. For example, the base layer may be formed of or comprise polyimide. When viewed in a plan view, the base layer may have a shape similar to... Figure 2B The display panel DP has basically the same shape.

[0061] The circuit device layer may include organic layers, inorganic layers, semiconductor patterns, conductive patterns, signal lines, etc. Organic layers, inorganic layers, semiconductor layers, and conductive layers can be formed on a base layer using coating and deposition methods. Subsequently, a photolithography process can be performed to selectively pattern the organic layers, inorganic layers, semiconductor layers, and conductive layers, resulting in the formation of semiconductor patterns, conductive patterns, and signal lines.

[0062] Semiconductor patterns, conductive patterns, and signal lines can be used as pixel driving circuitry for pixel PX, which will be described below (see, for example, [link to relevant documentation]). Figure 2B The pixel driving circuit may include signal lines SL1-SLm, DL1-DLn, EL1-ELm, CSL1, CSL2, and PL.

[0063] The display device layer may include light-emitting elements of pixels PX, as described below. The light-emitting elements may be electrically connected to at least one transistor. A thin encapsulation layer may be disposed on the circuit device layer to seal the display device layer. The thin encapsulation layer may include inorganic layers, organic layers, and inorganic layers stacked sequentially. The thin encapsulation layer is not limited to a stacked structure.

[0064] The input sensor IS may include sensing electrodes (not shown) for sensing external input, traces connected to the sensing electrodes (not shown), and an inorganic and / or organic layer that electrically isolates and protects the sensing electrodes or traces. The sensing electrodes may be connected to the display area DP-DA (e.g., see [link to DP-DA]). Figure 2B (Overlap.) The input sensor IS can be a capacitive sensing sensor, but the implementation is not limited to this.

[0065] During the manufacturing process of the display panel DP, the input sensor IS can be directly formed on the thin encapsulation layer through a continuous process. However, the implementation is not limited to this, and in some implementations, the input sensor IS can be manufactured as a panel different from the display panel DP, and can be attached to the display panel DP through an adhesive layer.

[0066] An anti-reflective element LF can reduce the optical reflectivity of light incident from the outside. The anti-reflective element LF may include a phase retarder and / or a polarizer. The anti-reflective element LF may include at least one polarizing film. In embodiments, the anti-reflective element LF may include a color filter and a black matrix. In this specification, the structure in which a display panel DP, an input sensor IS, and an anti-reflective element LF are stacked can be defined as a display module DM.

[0067] The lower component LM can include various functional components. For example, the lower component LM can include a light-blocking layer to prevent light from entering the display panel DP, an impact-absorbing layer to absorb external impacts, a support layer to support the display panel DP, a heat dissipation layer to dissipate heat generated in the display panel DP, and so on. However, the lower component LM is not limited to a stacked structure.

[0068] Reference Figure 2B The display panel DP may include a display area DP-DA and a non-display area DP-NDA surrounding or near the display area DP-DA. In an embodiment, the display area DP-DA or the non-display area DP-NDA may be determined based on the presence or absence of a pixel PX. For example, a pixel PX may be located within the display area DP-DA.

[0069] The display panel DP may include a display area DA corresponding to the display device DD and a non-display area NDA (e.g., see...). Figure 1A The display area DP-DA and the non-display area DP-NDA.

[0070] The scan driver (SDV), data driver, and transmit driver (EDV) can be located in the non-display area DP-NDA. The data driver can be configured as follows: Figure 2B The diagram shows a portion of the circuitry of the driver chip DIC.

[0071] The display panel DP may include a first area AA1, a second area AA2, and a curved area BA, which are three distinct areas on the second direction DR2. The second area AA2 and the curved area BA may be part of the non-display area DP-NDA. The curved area BA may be located between the first area AA1 and the second area AA2.

[0072] Figure 2B The display panel DP is shown in its unfolded state or before a bending operation. Even when the display panel DP is configured as part of an electronic device, it is still in a state such as... Figure 1A In the unfolded state shown, the first area AA1 and the second area AA2 of the display panel DP can also be set at different horizontal planes. This is because the curved area BA is curved such that the second area AA2 is set below the first area AA1.

[0073] The first region AA1 can be corresponding to Figure 1A The display surface DS area. The first area AA1 may include a first non-folded area NFA10, a second non-folded area NFA20, and a folded area FA0. The first non-folded area NFA10, the second non-folded area NFA20, and the folded area FA0 may respectively correspond to Figure 1A and Figure 1BThe first non-folded region NFA1, the second non-folded region NFA2, and the folded region FA.

[0074] When measured in the first direction DR1, the bending region BA and the second region AA2 can be shorter than the first region AA1. The shorter the length of the region in the direction of the bending axis, the easier the bending operation.

[0075] The display panel (DP) may include pixels (PX), scan lines SL1-SLm, data lines DL1-DLn, emission lines EL1-ELm, first control line CSL1 and second control line CSL2, power line PL, and pads (PD). Here, m and n are natural numbers. Pixels (PX) can be connected to scan lines SL1-SLm, data lines DL1-DLn, and emission lines EL1-ELm.

[0076] Scan lines SL1-SLm can extend along the first direction DR1 and can be connected to the scan driver SDV. Data lines DL1-DLn can extend along the second direction DR2 and can be connected to the driver chip DIC via the bend region BA. Transmit lines EL1-ELm can extend along the first direction DR1 and can be connected to the transmit driver EDV.

[0077] A portion of the power line PL extending in the second direction DR2 may extend to the second region AA2 via the bend region BA. The power line PL may be used to apply a first voltage to the pixel PX. The first control line CSL1 may be connected to the scan driver SDV and may extend to the lower portion of the second region AA2 via the bend region BA. The second control line CSL2 may be connected to the transmit driver EDV and may extend to the lower portion of the second region AA2 via the bend region BA.

[0078] When viewed in a plan view, the pad PD can be positioned adjacent to the lower portion of the second region AA2. The driver chip DIC, power line PL, first control line CSL1, and second control line CSL2 can be connected to the pad PD. The flexible circuit film FCB can be electrically connected to the pad PD via an anisotropic conductive adhesive layer.

[0079] Figure 2B An example of a driver chip DIC mounted on a display panel DP is shown, but the implementation is not limited to this. For example, the driver chip DIC can be mounted on a flexible circuit film FCB.

[0080] Figure 3A This is a schematic cross-sectional view showing a display device DD according to an embodiment. Figure 3A It shows along Figure 2B The cross section cut by line II-II'. Figure 3BThis is an enlarged schematic cross-sectional view showing a portion of a display device DD in an unfolded state according to an embodiment.

[0081] Figure 3C This is an enlarged schematic cross-sectional view showing a portion of a display device DD in a folded state according to an embodiment. Figure 4A This is a schematic plan view showing the support layer PLT according to an embodiment. Figure 4B It is shown Figure 4A An enlarged schematic plan view of a portion of the support layer PLT. Figure 4C and Figure 4D It is a schematic sectional view. Figure 4C and Figure 4D Each of them illustrates a cover layer SCV according to an implementation.

[0082] The following text will refer to Figures 3A to 3C The stacking structure of the display device DD according to the embodiment is described in more detail. (Refer to...) Figure 3A and Figure 3B The display device DD may include a window module WM, a display module DM, and a lower component LM. To avoid complexity in the accompanying drawings, the input sensor IS (see reference) Figure 2A )from Figure 3A Omitted in .

[0083] Reference Figure 3A The window module WM may include a thin glass substrate UTG, a window protective layer PF disposed on the thin glass substrate UTG, and a border pattern BP. In an embodiment, the window protective layer PF may include a plastic film. The window module WM may also include an adhesive layer AL1 (hereinafter, the first adhesive layer) for attaching the plastic film and the thin glass substrate UTG to each other. The border pattern BP may be associated with the non-display area DP-NDA (e.g., see...). Figure 2B Overlap. The border pattern BP can be set on the surface of the thin glass substrate UTG or the surface of the window protective layer PF. Figure 3A An example is shown in which a border pattern BP is disposed on the bottom surface of a window protective layer PF. However, the implementation is not limited to this, and in some embodiments, the border pattern BP may be disposed on the top surface of the window protective layer PF. The border pattern BP may be a colored light-blocking layer formed by, for example, coating or deposition methods. The border pattern BP may include a base material in which dyes or pigments are mixed.

[0084] Thin glass substrate UTG can have a thickness of about 15 μm to about 45 μm. Thin glass substrate UTG can be chemically strengthened glass. By using thin glass substrate UTG, crease formation can be suppressed even under repeated folding and unfolding operations.

[0085] The window protective layer PF can have a thickness of about 50 μm to about 80 μm. The window protective layer PF can be formed of or include at least one of polyimide, polycarbonate, polyamide, triacetyl cellulose, polymethyl methacrylate, and polyethylene terephthalate. Although not shown, at least one of a hard coating layer, an anti-fingerprint layer, and an anti-reflective layer can be disposed on the top surface of the window protective layer PF.

[0086] The first adhesive layer AL1 may be a pressure-sensitive adhesive (PSA) film or an optically clear adhesive (OCA) component. As described below, the display device DD may also include second adhesive layers AL2 to seventh adhesive layers AL7, and here, each or at least one of the second adhesive layers AL2 to seventh adhesive layers AL7 may be or include at least one of a pressure-sensitive adhesive (PSA) film, an optically clear adhesive (OCA) component, and a conventional adhesive.

[0087] The first adhesive layer AL1 can be separated from the thin glass substrate UTG. Because the window protective layer PF has lower stiffness than the thin glass substrate UTG, it is prone to scratches. The first adhesive layer AL1 and the window protective layer PF can be separated from the thin glass substrate UTG, and a new window protective layer PF can be attached to the thin glass substrate UTG.

[0088] The display module DM can be positioned below the window module WM. The display module DM may include an anti-reflective element LF and a display panel DP. (Reference) Figure 2A and Figure 2B The display panel DP has been described, so a detailed description of the display panel DP will not be repeated.

[0089] The anti-reflective component LF can be set in the first region AA1, such as Figure 3A As shown. The anti-reflective element LF can at least overlap the display area DP-DA (e.g., see...). Figure 2B The second adhesive layer AL2 can attach the anti-reflective component LF to the window module WM, and the third adhesive layer AL3 can attach the anti-reflective component LF to the display panel DP.

[0090] The lower component LM can be disposed below the display module DM. The lower component LM may include a panel protective layer PPL, a first buffer layer CL1, a support layer PLT, and a cover layer SCV. In embodiments, some of these components may be omitted from the lower component LM, or at least one other component may be included in the lower component LM. For example, the first buffer layer CL1 may be omitted. The display device DD may also include a heat dissipation layer.

[0091] The panel protective layer PPL can be disposed below the display panel DP and can be the element closest to the display panel DP. The panel protective layer PPL protects the display panel DP from any deposits or impacts that may be applied to the bottom surface of the display panel DP. The panel protective layer PPL can be formed of or comprise a flexible plastic material. For example, the panel protective layer PPL can be formed of or comprise polyethylene terephthalate. In some embodiments, the panel protective layer PPL may not be disposed in the folded area FAO.

[0092] In an implementation, the panel protective layer PPL may include a first panel protective layer PPL-1 that protects a first area AA1 of the display panel DP and a second panel protective layer PPL-2 that protects a second area AA2.

[0093] The fourth adhesive layer AL4 attaches the panel protective layer PPL to the display panel DP. The fourth adhesive layer AL4 may include a first portion AL4-1 corresponding to the first panel protective layer PPL-1 and a second portion AL4-2 corresponding to the second panel protective layer PPL-2. In the case of a bent region BA, the second panel protective layer PPL-2, together with the second region AA2, may be disposed below the first panel protective layer PPL-1. Since the panel protective layer PPL is not disposed in the bent region BA, the bent region BA can be bent more easily. The bent region BA may have curvature or radius of curvature. The radius of curvature may be in the range from about 0.1 mm to about 0.5 mm.

[0094] The fifth adhesive layer AL5 can attach the panel protective layer PPL to the first buffer layer CL1. The first buffer layer CL1 can be located below the panel protective layer PPL.

[0095] The first buffer layer CL1 can absorb external impacts that may be applied to the display panel DP and prevent the display panel DP from being damaged by external impacts. The first buffer layer CL1 can be a layer with elastic properties and can be formed or comprised of foam resin, sponge, or polyurethane. The first buffer layer CL1 can be colored and can prevent components disposed under the first buffer layer CL1 from being identified by the user when the user views the display device DD through the window module WM. The first buffer layer CL1 can be formed or comprised of at least one light-absorbing material.

[0096] The sixth adhesive layer AL6 can attach the bottom surface of the first buffer layer CL1 to the top surface of the support layer PLT. For example... Figure 3BAs shown, the sixth adhesive layer AL6 may include a first portion AL6-1 and a second portion AL6-2 spaced apart from each other. The distance D1 between the first portion AL6-1 and the second portion AL6-2 (hereinafter, the first distance) may correspond to the width of the folded region FA0. In an embodiment, the first distance D1 may be substantially the same as the width of the folded region FA0. The first distance D1 may be in the range of about 7 mm to about 15 mm, for example, about 9 mm to about 13 mm.

[0097] Since the sixth adhesive layer AL6 may not overlap with a portion of the support layer PLT, a portion of the width of the support layer PLT, given by the first distance D1, may not be attached to the first buffer layer CL1. Therefore, the support layer PLT in... Figure 3C The stress generated in the folded state shown can be prevented from being transferred to the components placed on the first buffer layer CL1. Therefore, the stress applied to the folded area FA0 of the display module DM and the window module WM in the folded state can be reduced.

[0098] In an implementation, the first portion AL6-1 and the second portion AL6-2 of the sixth adhesive layer AL6 can be defined as different parts of a single adhesive layer, but the implementation is not limited to this definition. The first portion AL6-1 can be defined as an adhesive layer (e.g., a first adhesive layer), while the second portion AL6-2 can be defined as another adhesive layer (e.g., a second adhesive layer).

[0099] In this embodiment, the intermediate layer disposed between the display panel DP and the support layer PLT is described as comprising a panel protective layer PPL and a first buffer layer CL1, but the structure of the intermediate layer is not limited thereto. The first buffer layer CL1 is shown as contacting the sixth adhesive layer AL6, but the embodiment is not limited thereto. In this embodiment, a plastic film may be further disposed between the first buffer layer CL1 and the sixth adhesive layer AL6, and here, the plastic film may be attached to the sixth adhesive layer AL6.

[0100] The support layer PLT can support the components mounted on the support layer PLT and can maintain the display device DD in its unfolded or folded state. The support layer PLT may include a first support layer PLT1 and a second support layer PLT2.

[0101] like Figure 3B , Figure 4A and Figure 4BAs shown, when the display device DD is in the unfolded state, the first support layer PLT1 and the second support layer PLT2 can be spaced apart from each other. However, in an embodiment, the first support layer PLT1 and the second support layer PLT2 may not be spaced apart from each other, and the side surface of the first support layer PLT1 contacts the side surface of the second support layer PLT2. Considering process tolerances, the first support layer PLT1 and the second support layer PLT2 can be set to be spaced apart from each other by a distance D2 (hereinafter, the second distance), which can prevent the first support layer PLT1 and the second support layer PLT2 from interfering with each other when they are arranged side by side. The second distance D2 can be equal to or less than about 0.7 mm.

[0102] The first support layer PLT1 may include a first support portion PLT1-1 corresponding to the first non-folded region NFA10, and a first protective portion PLT1-2 extending from the first support portion PLT1-1. The first protective portion PLT1-2 may correspond to a portion of the folded region FA0. The second support layer PLT2 may include a second support portion PLT2-1 corresponding to the second non-folded region NFA20, and a second protective portion PLT2-2 extending from the second support portion PLT2-1. The second protective portion PLT2-2 may correspond to a portion of the folded region FA0.

[0103] At least one of the first groove and the first opening may be defined in the first support layer PLT1, and at least one of the second groove and the second opening may be defined in the second support layer PLT2. The following description will refer to an example embodiment in which the first groove GV1 is formed in the bottom surface of the first support layer PLT1, and the second groove GV2 is formed in the bottom surface of the second support layer PLT2. Hereinafter, the arrangement of the grooves GV1 and GV2 will be described in more detail with reference to the first support layer PLT1. The grooves in the second support layer PLT2 or therein may have substantially the same features as those in the first support layer PLT1, which will be described below.

[0104] Some of the first grooves GV1 may be located in the first region PLT1-11 of the first support portion PLT1-1 adjacent to the first protective portion PLT1-2, and some of the first grooves GV1 may be located in the first region PLT1-21 of the first protective portion PLT1-2 adjacent to the first support portion PLT1-1. In an embodiment, at least one of the first grooves GV1 may overlap with both the first region PLT1-11 of the first support portion PLT1-1 and the first region PLT1-21 of the first protective portion PLT1-2.

[0105] Another region of the first support portion PLT1-1 where the first groove GV1 is not formed can be defined as the second region PLT1-12, and another region of the first protective portion PLT1-2 where the first groove GV1 is not formed can be defined as the second region PLT1-22. Similarly, the second support portion PLT2-1 may include the first region PLT2-11 and the second region PLT2-12, and the second protective portion PLT2-2 may include the first region PLT2-21 and the second region PLT2-22.

[0106] The second region PLT1-12 of the first support portion PLT1-1 and the second region PLT1-22 of the first protective portion PLT1-2 can have a uniform thickness in the second direction DR2. The second region PLT2-12 of the second support portion PLT2-1 and the second region PLT2-22 of the second protective portion PLT2-2 can also have a uniform thickness in the second direction DR2.

[0107] The first groove GV1 can be continuously provided from the first region PLT1-11 of the first support portion PLT1-1 to the first region PLT1-21 of the first protection portion PLT1-2. In the second direction DR2, the first grooves GV1 can be spaced apart by the same distance. In the second direction DR2, the width of the first grooves GV1 can be the same, but the implementation is not limited to this.

[0108] The first support layer PLT1 and the second support layer PLT2 can be formed of or include at least one of SUS (stainless steel), Invar alloy, aluminum alloy, magnesium alloy, copper alloy, and titanium alloy, but the embodiments are not limited thereto. For example, the first support layer PLT1 and the second support layer PLT2 can include various metallic materials. The first support portion PLT1-1 and the first protective portion PLT1-2 can be configured as a single object and can be formed of or include the same material.

[0109] Reference Figure 3B The seventh adhesive layer AL7 can attach the support layer PLT to the cover layer SCV. The seventh adhesive layer AL7 may include a first portion AL7-1 and a second portion AL7-2 spaced apart from each other. The first portion AL7-1 and the second portion AL7-2 may correspond to the first support layer PLT1 and the second support layer PLT2, respectively. The distance between the first portion AL7-1 and the second portion AL7-2 of the seventh adhesive layer AL7 may correspond to the first distance D1 described above. In an embodiment, the distance between the first portion AL7-1 and the second portion AL7-2 of the seventh adhesive layer AL7 may be greater than the first distance D1.

[0110] The cover layer SCV can be attached to the first support layer PLT1 and the second support layer PLT2, can correspond to the first non-folded region NFA10, the second non-folded region NFA20 and the folded region FA0, and can overlap with the first groove GV1 and the second groove GV2 defined in the support layer PLT.

[0111] The capping layer SCV can have a lower elastic modulus than the support layer PLT. The capping layer SCV can have a thickness of about 100 μm or less and can have an elastic modulus of about 100 MPa or lower. As an example, the capping layer SCV can have the same structure as a mesh filter. As an example, the capping layer SCV can include a plastic film. The capping layer SCV can include a buffer layer, such as a foam resin layer or a silicone resin layer.

[0112] Even in such Figure 3C As shown in the folded state, when the empty space between the first support layer PLT1 and the second support layer PLT2 is expanded by the folding operation, the cover layer SCV can also prevent contaminants from passing through the expanded empty space.

[0113] Although not shown in the accompanying drawings, a hinge structure may be provided below the cover layer SCV to physically or stably maintain or change the folded state of the display device DD (e.g., from an unfolded state to a folded state or vice versa).

[0114] Reference Figure 4C The cover layer SCV1 may also include a plastic resin layer PRL disposed on the top surface of the buffer layer CCL. The plastic resin layer PRL can reduce tear failure in the cover layer SCV1. The plastic resin layer PRL can be formed by forming PET or PI resin on the top surface of the buffer layer CCL by spin coating or slot coating methods.

[0115] Reference Figure 4D The cover layer SCV2 may further include a heat dissipation layer HRL disposed on the bottom surface of the buffer layer CCL. The heat dissipation layer HRL may have a higher thermal conductivity than the buffer layer CCL. The heat dissipation layer HRL can radiate heat generated by electronic components disposed below the cover layer SCV2. The heat dissipation layer HRL may be formed of or comprise graphite. The heat dissipation layer HRL may not be disposed in the folded region FA0 (e.g., see...). Figure 3B Electronic components may include flexible circuit films (FCBs) (e.g., see [reference needed]). Figure 2B ) or a driver chip DIC mounted on the flexible circuit film FCB (e.g., see Figure 2B ).

[0116] Reference Figure 3B and Figure 3CThe changes in the relative positions of the components caused by the shape change of the display device DD from the unfolded state to the folded state will be described in more detail. The first support layer PLT1 will be described to avoid repetition.

[0117] like Figure 3B and Figure 3C As shown, the overlay layer SCV may include a first overlay region SCV-1 corresponding to the folded region FA0, a second overlay region SCV-2 corresponding to the first non-folded region NFA10, and a third overlay region SCV-3 corresponding to the second non-folded region NFA20.

[0118] like Figure 3B As shown, when the display device DD is in the unfolded state, the first coverage area SCV-1 and the display panel DP can be spaced apart from each other by a third distance D3. The third distance D3 can be measured in the area where the first support layer PLT1 and the second support layer PLT2 are spaced apart from each other. When the display device DD is in the unfolded state, the second coverage area SCV-2 and the display panel DP can be spaced apart from each other by a fourth distance D4 that is less than the third distance D3.

[0119] When the state of the display device DD changes from the unfolded state to the state as follows Figure 3C When the device DD is in the folded state as shown, the second distance D2 can be increased, and the third distance D3 can be decreased. When the state of the display device DD changes from the unfolded state to the folded state, the fourth distance D4 may remain unchanged. The changed second distance D20, the changed third distance D30, and the fourth distance D4 are... Figure 3C As shown, the fourth distance D4 remains unchanged.

[0120] When the display device DD changes from an unfolded state to a folded state, the cover layer SCV can be stretched. The stretched cover layer SCV, due to the shape change of the display device DD, can contact the first protective portion PLT1-2 and the second protective portion PLT2-2 adjacent to the folding axis FX. Due to its restoring force, although the cover layer SCV is stretched, it can deform in a manner that reduces the stretched portion, and therefore, the cover layer SCV can contact the first protective portion PLT1-2 and the second protective portion PLT2-2. When the display device DD is in the folded state, the central region of the first cover area SCV-1 can have the maximum radius of curvature within the first cover area SCV-1. When the display device DD is in the folded state, the area of ​​the first cover area SCV-1 that contacts the first protective portion PLT1-2 can have a smaller radius of curvature than the central region of the cover layer SCV.

[0121] The cover layer SCV can apply compressive stress to the first support layer PLT1 and the second support layer PLT2, which can cause deformation of the spaced-apart first support layer PLT1 and the second support layer PLT2. The regions in which the grooves GV1 and GV2 are formed can have a smaller elastic modulus than other regions, and therefore can deform under the applied compressive stress. When the display device DD is folded, the first region PLT1-21 of the first protective portion PLT1-2 and the first region PLT2-21 of the second protective portion PLT2-2 can be bent.

[0122] Although the first groove GV1 and the second groove GV2 are respectively formed in the first region PLT1-11 of the first support portion PLT1-1 and the first region PLT2-11 of the second support portion PLT2-1, the first support portion PLT1-1 and the second support portion PLT2-1 are bonded to the first buffer layer CL1 through the sixth adhesive layer AL6. Therefore, the first support portion PLT1-1 and the second support portion PLT2-1 can hardly deform or only slightly deform. The first groove GV1 and the second groove GV2 formed in the first region PLT1-11 of the first support portion PLT1-1 and the first region PLT2-11 of the second support portion PLT2-1 can prevent sudden bending of the first region PLT1-21 of the first protective portion PLT1-2 and the first region PLT2-21 of the second protective portion PLT2-2 and can distribute the applied stress, thereby allowing the bending operation to be performed gradually.

[0123] The second regions PLT1-22 of the first protective portion PLT1-2 and PLT2-22 of the second protective portion PLT2-2 can have relatively high elastic modulus, and can maintain their unfolded shape (unfolded shape) even when the display device DD is folded. Even when the state of the display device DD changes from... Figure 3B The unfolded state changes repeatedly to Figure 3C When folded, the first protective portion PLT1-2 and the second protective portion PLT2-2 do not undergo significant deformation in their second regions PLT1-22 and PLT2-22, respectively. Therefore, the first and second protective portions PLT1-2 and PLT2-2 can effectively support the structure in the unfolded state. The first and second protective portions PLT1-2 and PLT2-2 do not cause creases in the display device DD.

[0124] If the first groove GV1 and the second groove GV2 are not formed in the first protective portion PLT1-2 and the second protective portion PLT2-2, then as follows Figure 3BAs shown, the first protective portion PLT1-2 and the second protective portion PLT2-2 can maintain the same plane as the first support portion PLT1-1 and the second support portion PLT2-1, regardless of the shape change (no bending) of the display device DD. Without the formation of the first groove GV1 and the second groove GV2, the first protective portion PLT1-2 and the second protective portion PLT2-2, which have stretchable properties, and the cover layer SCV that causes deformation of the first protective portion PLT1-2 and the second protective portion PLT2-2, may exert large-scale stresses on each other. This stress may concentrate on a portion of the end portion of the cover layer SCV that contacts the first protective portion PLT1-2 and the second protective portion PLT2-2, and this may lead to tearing failure of the cover layer SCV.

[0125] Conversely, according to the embodiment, since the first region PLT1-21 of the first protective portion PLT1-2 and the first region PLT2-21 of the second protective portion PLT2-2 are flexible, the stress applied to the portion of the cover layer SCV that contacts the end portions of the first protective portion PLT1-2 and the second protective portion PLT2-2 can be reduced. Therefore, tearing failure of the cover layer SCV caused by the first protective portion PLT1-2 and the second protective portion PLT2-2 can be prevented.

[0126] Figure 5A and Figure 5B This is an enlarged schematic cross-sectional view showing a portion of a display device DD according to an embodiment. Figure 5A Corresponding to Figure 3B ,and Figure 5B Corresponding to Figure 3C For the sake of brevity, the previous references will be used in the following description. Figures 1A to 4D The elements described can be identified using the same reference numerals in the accompanying drawings, without having to be described repeatedly.

[0127] Reference Figure 5A The sixth adhesive layer AL60 may include a first portion AL6-10 attached to the top surface of the first support portion PLT1-1, a second portion AL6-20 attached to the top surface of the second support portion PLT2-1, and a third portion AL6-30 overlapping with but not attached to the top surfaces of the first and second protective portions PLT1-2 and PLT2-2. The third portion AL6-30 of the sixth adhesive layer AL60 may be cured, and the sixth adhesive layer AL60 may be attached to the first buffer layer CL1. The adhesive properties of the cured third portion AL6-30 may be removed.

[0128] Since the third part AL6-30 supports the first buffer layer CL1 in the folded state but is not attached to it, the stress generated by the first protective part PLT1-2 and the second protective part PLT2-2 can be prevented from being transferred to the components on the first buffer layer CL1. Therefore, the stress generated in the support layer PLT can be prevented from being transmitted to the display panel DP and window module WM disposed on the first buffer layer CL1 (see, for example, see...). Figure 3A ).

[0129] like Figure 5B As shown, a first groove GV1 can be disposed in each of the top and bottom surfaces of the first support layer PLT1. A second groove GV2 can be disposed in each of the top and bottom surfaces of the second support layer PLT2. According to an embodiment, with Figure 3C Compared to the display device DD, the first region PLT1-21 of the first protective portion PLT1-2 and the first region PLT2-21 of the second protective portion PLT2-2 can be bent more easily. This is because the effective elastic modulus of the first protective portion PLT1-2 and the second protective portion PLT2-2 is reduced due to the grooves GV1 and GV2 formed in the two surfaces of the first protective portion PLT1-2 and the second protective portion PLT2-2.

[0130] Figure 6A This is a schematic plan view showing the support layer PLT according to an embodiment. Figure 6B It is shown Figure 6A A magnified schematic plan view of region AA. Figure 6C It shows that it is set with Figure 6A and Figure 6B An enlarged cross-sectional view of a portion of the display device DD of the PLT support layer. For brevity, references are made to the preceding text in the following description. Figures 1A to 5B The described elements can be identified using the same reference numerals, without being described repeatedly.

[0131] like Figure 6A and Figure 6B As shown, the first opening OP1 can be formed from the first region PLT1-11 of the first support portion PLT1-1 to the first region PLT1-21 of the first protection portion PLT1-2, and the second opening OP2 can be formed from the first region PLT2-11 of the second support portion PLT2-1 to the first region PLT2-21 of the second protection portion PLT2-2.

[0132] The first opening OP1 and the second opening OP2 can be configured in a grid shape or a lattice shape. The first opening OP1 and the second opening OP2 can be configured in the same shape, and the first protective portion PLT1-2 and the second protective portion PLT2-2 can have substantially the same elastic modulus.

[0133] With which it forms Figure 3C Compared to the first region PLT1-21 of the first protective portion PLT1-2 and the first region PLT2-21 of the second protective portion PLT2-2 shown in the grooves GV1 and GV2, the first region PLT1-21 of the first protective portion PLT1-2 and the first region PLT2-21 of the second protective portion PLT2-2 can be bent more easily.

[0134] In other examples, at least one of the first opening OP1 and the second opening OP2 can be replaced by a groove. In an embodiment, the density of the openings or grooves can be adjusted to obtain the desired elastic modulus of the first region PLT1-11 of the first support portion PLT1-1 and the first region PLT1-21 of the first protective portion PLT1-2. In an embodiment, the first groove GV1 can be provided in the first region PLT1-11 of the first support portion PLT1-1, and the first opening OP1 can be provided in the first region PLT1-21 of the first protective portion PLT1-2.

[0135] According to the implementation method, crease problems in display devices can be prevented or suppressed by repeating folding and unfolding operations.

[0136] The covering layer prevents contaminated material from entering the folded area during the transition between folding and unfolding operations.

[0137] Although embodiments have been shown and described, those skilled in the art will understand that changes in form and detail may be made herein without departing from the spirit and scope of the appended claims.

Claims

1. A display device, including: The display panel includes a first non-foldable area, a second non-foldable area, and a foldable area in a first direction between the first non-foldable area and the second non-foldable area. as well as A lower component is disposed below the display panel, wherein the lower component includes: The first support layer includes: The first support portion corresponds to the first non-folded area; A first protective portion extends from the first support portion and corresponds to the folded area; and At least one of the first groove and the first opening is located in a first region of the first support portion adjacent to the first protective portion and in a first region of the first protective portion adjacent to the first support portion; The second support layer includes: The second support portion corresponds to the second non-folded area; The second protective portion extends from the second support portion and corresponds to the folded area; and At least one of the second groove and the second opening is located in a first region of the second support portion adjacent to the second protective portion and in a first region of the second protective portion adjacent to the second support portion; and A cover layer is disposed below and attached to the first and second support layers, and corresponds to the first non-folded area, the second non-folded area, and the folded area. The covering layer includes: The first covered area corresponds to the folded area; and The second coverage area corresponds to the first non-folded area, and When the display panel is in the unfolded state, the distance between the first coverage area and the display panel is greater than the distance between the second coverage area and the display panel.

2. The display device according to claim 1, wherein, The first groove is provided in multiple forms in the first region of the first support portion and in the first region of the first protection portion. The plurality of first grooves are spaced evenly apart from each other in the first direction, and The plurality of the first grooves have the same width.

3. The display device according to claim 1, wherein, The first opening is provided in multiple forms in the first region of the first support portion and in the first region of the first protection portion. The plurality of the first openings are configured in a grid shape or a lattice shape.

4. The display device according to claim 1, wherein, The lower component also includes: A first adhesive layer is attached to the top surface of the first support portion; and A second adhesive layer is attached to the top surface of the second support portion, and The first adhesive layer and the second adhesive layer are spaced apart from each other in the first direction, and Wherein, when the display device is in the unfolded state, the distance between the first adhesive layer and the second adhesive layer corresponds to the width of the folded area.

5. The display device according to claim 1, wherein, The lower component also includes: A panel protective layer is disposed between the display panel and the first support layer and between the display panel and the second support layer; and A buffer layer is disposed between the panel protective layer and the first support layer, and between the panel protective layer and the second support layer.

6. The display device according to claim 1, wherein, The lower component also includes: A first adhesive layer attaches the first support portion to the cover layer; and A second adhesive layer attaches the second support portion to the cover layer, and The first adhesive layer and the second adhesive layer are spaced apart from each other in the first direction.

7. The display device according to claim 1, wherein, The distance between the first coverage area and the display panel is greater when the display panel is in the unfolded state than when the display panel is in the folded state. Wherein, when the display panel is in the unfolded state, the first covered area of ​​the cover layer is spaced apart from the first protective portion of the first support layer, and When the display panel is in the folded state, the first covered area of ​​the cover layer contacts the first protective portion of the first support layer.

8. A display device, including: The display panel includes a first non-foldable area, a second non-foldable area, and a foldable area in a first direction between the first non-foldable area and the second non-foldable area. as well as The lower component is located below the display panel. The lower component includes: The first support layer includes: The first support portion corresponds to the first non-folded region; and The first protective portion extends from the first support portion and corresponds to the folded area; The second support layer includes: The second support portion corresponds to the second non-folded region; and The second protective portion extends from the second support portion, corresponds to the folded area, and is spaced apart from the first support layer; and A cover layer is disposed below and attached to the first and second support layers, and corresponds to the first non-folded area, the second non-folded area, and the folded area. The first protection part includes: The first region includes at least one of a first groove and a first opening; and The second region excludes the first groove or the first opening. The second protection part includes: The first region includes at least one of the second groove and the second opening; and The second region, excluding the second groove or the second opening. The second region of the first protected portion is closer to the second region of the second protected portion than the first region of the first protected portion. The second region of the second protection portion is closer to the second region of the first protection portion than the first region of the second protection portion.

9. The display device according to claim 8, wherein, A third groove or a third opening is provided in the area of ​​the first support portion adjacent to the first protective portion, and A fourth groove or a fourth opening is provided in the area of ​​the second support portion adjacent to the second protective portion.

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