Window and display device including same

Abstract

The invention provides a window and a display device including the same. The window according to one embodiment of the present invention comprises a cover layer, the coating layer includes a base resin including at least one of a siloxane-epoxy compound, an epoxy (meth) acrylate compound, and a urethane (meth) acrylate compound, a siloxane-modified polyol, a diglycidyl ether compound, a photoinitiator, and a sensitizer.

Description

Technical Field

[0001] The present invention relates to a window and a display device including the same, and more specifically, to a window with excellent mechanical properties and a display device including the same. Background Technology

[0002] Display devices are used in various multimedia devices such as televisions, mobile phones, tablet computers, and game consoles to provide users with image information. Recently, flexible display devices in various foldable or bendable forms have been developed. The shape of flexible display devices can be folded, rolled, or bent, thus making them easy to carry.

[0003] Flexible display devices can include foldable or bendable display panels and windows. However, the windows of flexible display devices are susceptible to deformation due to folding or bending operations or damage from external impacts. Summary of the Invention

[0004] The purpose of this invention is to provide a window with improved folding reliability and durability.

[0005] The object of the present invention is to provide a display device that includes a window with improved folding reliability and durability.

[0006] A window according to an embodiment of the present invention includes a cover layer, wherein the cover layer comprises: a base resin comprising at least one of a siloxane-epoxy compound, an epoxy (meth)acrylate compound, and a urethane (meth)acrylate compound; a siloxane-modified polyol; a diglycidyl ether compound; a photoinitiator; and a sensitizer.

[0007] The thickness of the covering layer can be greater than 30 μm and less than 75 μm.

[0008] Relative to the total content of the capping layer of 100 wt%, the capping layer may contain 70 wt% to 80 wt% of the base resin, 5 wt% to 10 wt% of the siloxane-modified polyol, 1 wt% to 5 wt% of the diglycidyl ether compound, 3 wt% to 5 wt% of the photoinitiator, and 1 wt% to 5 wt% of the sensitizer.

[0009] The base resin can be a siloxane-epoxy compound.

[0010] The siloxane-modified polyol may include caprolactone polyol.

[0011] The photoinitiator may include at least one of iodonium salts, sulfonium salts, thallium salts, acetophenone compounds, sulfonium compounds, benzophenone compounds, and organohalides.

[0012] The sensitizer may be a thioxanone compound.

[0013] The modulus of the capping layer can be above 500 MPa and below 1.5 GPa.

[0014] The window may also include a base layer disposed beneath the cover layer, wherein the base layer may include a polyethylene terephthalate film.

[0015] The thickness of the base layer can be greater than 20 μm and less than 50 μm.

[0016] The window may further include: a protective layer disposed on the covering layer; and a protective adhesive layer disposed between the protective layer and the covering layer.

[0017] The window may also include a functional layer disposed on the covering layer and containing a fluorinated compound, wherein the thickness of the functional layer may be less than 10 μm.

[0018] A display device according to an embodiment of the present invention includes: a display module; and a window as described above, disposed on the display module.

[0019] The base layer of the window is arranged between the display module and the cover layer, and includes a polymer film.

[0020] The covering layer included in the window can be directly arranged on the base layer.

[0021] The display device may further include: a window adhesive layer disposed between the display module and the window, wherein the base layer may be directly disposed on the window adhesive layer and the cover layer may be directly disposed on the base layer.

[0022] The display module may include: a base substrate; a circuit layer disposed on the base substrate; a light-emitting element layer disposed on the circuit layer; an encapsulation layer disposed on the light-emitting element layer; and an optical layer disposed on the encapsulation layer, wherein the optical layer may include a polarizing layer or a color filter layer.

[0023] The cover layer can be directly disposed on the optical layer.

[0024] The display device may further include: a window adhesive layer disposed between the optical layer and the cover layer, wherein the cover layer may be disposed directly on the window adhesive layer.

[0025] The display device may include at least one folding portion, which is folded with respect to a folding axis extending in one direction.

[0026] According to embodiments of the present invention, the window may include a covering layer containing a specific material, thereby improving impact resistance and enhancing folding characteristics. This can improve the reliability and durability of display devices including windows. Attached Figure Description

[0027] Figure 1a This is a perspective view showing the unfolded state of a display device according to an embodiment of the present invention.

[0028] Figure 1b It is shown Figure 1a A perspective view of the inward folding process of the display device shown.

[0029] Figure 1c It is shown Figure 1a A perspective view of the outward folding process of the display device shown.

[0030] Figure 2a This is a perspective view showing the unfolded state of a display device according to an embodiment of the present invention.

[0031] Figure 2b It is shown Figure 2a A perspective view of the inward folding process of the display device shown.

[0032] Figure 2c It is shown Figure 2a A perspective view of the outward folding process of the display device shown.

[0033] Figure 3 This is an exploded perspective view of a display device according to an embodiment of the present invention.

[0034] Figure 4 This is a cross-sectional view of a display device according to an embodiment of the present invention.

[0035] Figure 5 This is a cross-sectional view of a display module according to an embodiment of the present invention.

[0036] Figures 6a to 6c This is a cross-sectional view showing a partial configuration of a display device according to an embodiment of the present invention.

[0037] Figures 7a to 7c This is a cross-sectional view showing a partial configuration of a display device according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures ED: Display device; DM: Display module WM, WM-1, WM-2, WM-3, WM-4, WM-5: Window CVL: Overlay Layer; BS: Base Layer PL: Protective layer; AP-PL: Protective adhesive layer AF: Functional layer; RCL: Optical layer AP-W: Window Adhesive Layer Detailed Implementation

[0039] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0040] In this specification, when referring to a component (or region, layer, part, etc.) being "on", "connected to", or "integrated into" another component, it means that it can be directly arranged / connected / integrated into the other component, or that a third component can be arranged between them.

[0041] The same reference numerals refer to the same constituent elements. Furthermore, in the drawings, the thickness, proportions, and dimensions of the constituent elements are exaggerated for the purpose of effectively illustrating the technical content. The term "and / or" includes all combinations that can define one or more of the relevant constituent elements.

[0042] The terms "first," "second," etc., can be used to describe multiple constituent elements, but the constituent elements are not limited by the terms. The terms are used only to distinguish one constituent element from another. For example, without departing from the scope of the invention, a first constituent element can be named a second constituent element, and similarly, a second constituent element can be named a first constituent element. Unless the context clearly indicates otherwise, singular expressions include plural expressions.

[0043] Furthermore, terms such as "below," "below," "above," and "on top" are used to describe the relationships between the constituent elements shown in the accompanying drawings. These terms are relative concepts and are described based on the directions shown in the drawings.

[0044] Terms such as “including” or “having” should be understood to indicate the presence of features, figures, steps, operations, constituent elements, components or combinations thereof as described in the specification, rather than precluding the presence or additional possibility of one or more other features or figures, steps, operations, constituent elements, components or combinations thereof.

[0045] In this specification, "direct arrangement" can refer to a situation where no additional layers, films, regions, plates, etc., are added between the layers, films, regions, plates, etc., and other parts. For example, "direct arrangement" can refer to a situation where no additional components such as adhesive components are used between two layers or two components.

[0046] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, terms such as those defined in common dictionaries shall be interpreted as having the same meaning as they have in the context of the relevant art, and shall not be construed as having overly ideal or formal meanings unless expressly defined herein.

[0047] Hereinafter, a window according to an embodiment of the present invention and a display device according to an embodiment will be described with reference to the accompanying drawings.

[0048] Figure 1a This is a perspective view showing the unfolded state of a display device according to an embodiment. Figure 1b It is shown Figure 1a A perspective view of the inward folding process of the display device shown. Figure 1c It is shown Figure 1a A perspective view of the outward folding process of the display device shown.

[0049] In one embodiment, the display device ED can be a device activated by an electrical signal. For example, the display device ED can be a mobile phone, tablet computer, car navigation system, game console, or wearable device, but the embodiments are not limited thereto. (See the description of the invention.) Figure 1a The example shown is a case where the display device ED is a portable telephone.

[0050] Reference Figures 1a to 1c According to one embodiment, a display device ED may include a first display surface FS defined by a first direction DR1 and a second direction DR2 intersecting the first direction DR1. The display device ED can provide an image IM to a user through the first display surface FS. In one embodiment, the display device ED can display the image IM facing a third direction DR3 using the first display surface FS, which is parallel to both the first direction DR1 and the second direction DR2. In this specification, the front surface (or upper surface) and rear surface (or lower surface) are defined based on the direction in which the image IM is displayed. The front surface and rear surface may be opposite each other on the third direction DR3, and the normal directions of the front surface and rear surface may be parallel to the third direction DR3.

[0051] A display device ED according to one embodiment may include a first display surface FS and a second display surface RS. The first display surface FS may include an effective area F-AA and a peripheral area F-NAA. The effective area F-AA may include an electronic module area EMA. The second display surface RS may be defined as a surface facing at least a portion of the first display surface FS. That is, the second display surface RS may be defined as a portion of the rear surface of the display device ED.

[0052] According to one embodiment, the display device ED can detect external input applied from the outside. External input can include various forms of input provided from outside the display device ED. For example, external input can include contact generated by a part of the user's body, such as a hand, and can include external input applied when the device is close to or at a predetermined distance from the display device ED (e.g., hovering). Furthermore, it can have various forms such as force, pressure, temperature, and light.

[0053] In addition, Figure 1a The following figures show the first direction DR1 to the third direction DR3. The directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 as described in this specification are relative concepts and can be converted to other directions.

[0054] The effective area F-AA of the display device ED can be an area activated by an electrical signal. According to one embodiment, the display device ED can display an image IM through the effective area F-AA. Furthermore, various forms of external input can be detected in the effective area F-AA. A peripheral area F-NAA is adjacent to the effective area F-AA. The peripheral area F-NAA can have a predetermined color. The peripheral area F-NAA can surround the effective area F-AA. Thus, the shape of the effective area F-AA can be substantially defined by the peripheral area F-NAA. However, this is illustrative; the peripheral area F-NAA may also be arranged adjacent only to one side of the effective area F-AA, or it may be omitted. The display device ED according to an embodiment of the present invention can include effective areas of various shapes and is not limited to one embodiment.

[0055] The display device ED may include a folded region FA1 and non-folded regions NFA1 and NFA2. In one embodiment, the non-folded regions NFA1 and NFA2 may be arranged adjacent to the folded region FA1, separated by the folded region FA1. In another embodiment, the display device ED may include a first non-folded region NFA1 and a second non-folded region NFA2 arranged spaced apart from each other along a first direction DR1, separated by the folded region FA1. For example, the first non-folded region NFA1 may be arranged along the first direction DR1 on one side of the folded region FA1, and the second non-folded region NFA2 may be arranged along the first direction DR1 on the other side of the folded region FA1.

[0056] in addition, Figures 1a to 1cThe illustration shows an embodiment of a display device ED including a folded region FA1, but the embodiment is not limited thereto, and the display device ED may define multiple folded regions. For example, the display device ED according to one embodiment may include two or more folded regions, and may also include three or more non-folded regions arranged alternately to each of the folded regions.

[0057] Reference Figure 1b According to one embodiment, the display device ED can be folded with respect to a first folding axis FX1. The first folding axis FX1 is an imaginary axis extending along a second direction DR2, and the first folding axis FX1 can be parallel to the long side direction of the display device ED. The first folding axis FX1 can extend along the second direction DR2 on the first display surface FS.

[0058] The display device ED can be folded with reference to the first folding axis FX1, thereby deforming into an in-folding state in which one area of ​​the first display surface FS overlaps with the first non-folding area NFA1 and another area overlaps with the second non-folding area NFA2, with each other facing each other.

[0059] Furthermore, in a display device ED according to one embodiment, a user can see a second display surface RS in an inward-folded state. The second display surface RS may also include an electronic module area in which electronic modules comprising various configurations are arranged, and is not limited to one embodiment.

[0060] Reference Figure 1c According to one embodiment, the display device ED can be folded with reference to a first folding axis FX1, thereby deforming into an out-folding state in which a region of the second display surface RS that overlaps with the first non-folded region NFA1 and another region that overlaps with the second non-folded region NFA2 face each other.

[0061] However, the embodiments are not limited to this. They can be folded based on multiple folding axes, so as to fold into partial faces of the first display surface FS and the second display surface RS respectively. The number of folding axes and the number of non-folded areas thereon are not particularly limited.

[0062] Multiple electronic modules can be arranged in the Electronic Module Area (EMA). For example, an electronic module may include at least one of a camera, a speaker, a light detection sensor, and a thermal detection sensor. The EMA can detect external objects received through the first display surface (FS) or the second display surface (RS), or can provide sound signals such as voice to the outside through the first display surface (FS) or the second display surface (RS). The electronic module may also include multiple components and is not limited to one embodiment.

[0063] The electronic module area (EMA) can be surrounded by the effective area (F-AA) and the surrounding area (F-NAA). However, it is not limited to this; the electronic module area (EMA) can be arranged within the effective area (F-AA), and it is not limited to one embodiment.

[0064] Figure 2a This is a perspective view showing the unfolded state of a display device according to an embodiment. Figure 2b It is shown Figure 2a A perspective view of the inward folding process of the display device shown. Figure 2c It is shown Figure 2a A perspective view of the outward folding process of the display device shown.

[0065] One embodiment of the display device ED-a can be folded with reference to a second folding axis FX2 extending in a direction parallel to the second direction DR2. Figure 2b The illustration shows a case where the extension direction of the second folding axis FX2 is parallel to the extension direction of the short side of the display device ED-a. However, the embodiment is not limited to this.

[0066] According to one embodiment, the display device ED-a may include at least one folded region FA2 and non-folded regions NFA3 and NFA4 adjacent to the folded region FA2. The non-folded regions NFA3 and NFA4 may be arranged apart from each other through the folded region FA2.

[0067] The folded region FA2 has a predetermined curvature and radius of curvature. In one embodiment, the first non-folded region NFA3 and the second non-folded region NFA4 can face each other, and the display device ED-a can be inner-folded in such a way that the first display surface FS is not exposed to the outside. Furthermore, referring to... Figure 2c In one embodiment, the display device ED-a can be folded outward with the first display surface FS exposed to the outside.

[0068] According to one embodiment, the display device ED-a may include a second display surface RS, which may be defined as a surface facing at least a portion of a first display surface FS. The second display surface RS may include an electronic module region EMA in which electronic modules comprising various configurations are arranged. Furthermore, images or videos may be displayed on at least a portion of the second display surface RS.

[0069] In another embodiment, the display device ED-a can be viewed by the user in its open state, with the first display surface FS visible, and in its inward-folded state, with the second display surface RS visible.

[0070] In one embodiment, the display devices ED and ED-a can be configured such that the operations from unfolding to folding inward or outward repeat, but the embodiment is not limited thereto. In one embodiment, the display devices ED and ED-a can be configured to select one of unfolding, folding inward, and folding outward. Furthermore, in the case of multiple folding regions, the folding direction of at least one of the multiple folding regions can be different from the folding direction of the other folding regions. For example, in the case of two folding regions, two non-folding regions separated by one folding region can be folded inward, and two non-folding regions separated by the other folding region can be folded outward.

[0071] Figure 3 This is an exploded perspective view of a display device according to one embodiment. Figure 4 This is a cross-sectional view of a display device according to an embodiment. Figure 3 An example is shown Figure 1a An exploded perspective view of a display device according to one embodiment is shown. Figure 4 It is shown that... Figure 3 A cross-sectional view of the portion corresponding to the I-I' line.

[0072] Additionally, the following, in Figure 3 and Figure 4 The above shows Figure 1a The example shown depicts a display device ED with its folding axis FX1 parallel to its long side. However, the embodiment is not limited to this, and the following description with reference to the accompanying drawings can also be applied to other devices. Figure 2a The case shown is where the folding axis FX2 is parallel to the short side of the display device ED-a.

[0073] Reference Figure 3 and Figure 4 One embodiment of the display device ED may include a display module DM and a window WM disposed on the upper side of the display module DM. Furthermore, one embodiment of the display device ED may also include a lower module LM disposed on the lower side of the display module DM.

[0074] In one embodiment, the display device ED may further include a window adhesive layer AP-W disposed between the display module DM and the window WM. Alternatively, in another embodiment of the display device ED, the window adhesive layer AP-W may be omitted. When the window adhesive layer AP-W is omitted, the window WM can be directly disposed on the display module DM.

[0075] The lower module LM may include a support plate MP disposed below the display module DM. The lower module LM may also be referred to as a support component.

[0076] The display device ED may include a housing HAU that houses the display module DM and the lower module LM, etc. The housing HAU may be combined with a window WM. Although not shown, the housing HAU may also include a hinge structure for facilitating folding or bending. The window WM may be a cover window arranged on the display module DM.

[0077] One embodiment of the display device ED may include a window adhesive layer AP-W disposed between the display module DM and the window WM. The window adhesive layer AP-W may be an optically clear adhesive film (OCA) or an optically clear adhesive resin layer (OCR). Alternatively, in one embodiment, the window adhesive layer AP-W may be omitted.

[0078] The window WM can cover the entire upper surface of the display module DM. The window WM can have a shape corresponding to the shape of the display module DM.

[0079] Window WM may include a folding portion FP-W and non-folding portions NFP1-W and NFP2-W. The first non-folding portion NFP1-W and the second non-folding portion NFP2-W of window WM may be separated from each other by the folding portion FP-W in the first direction DR1. The folding portion FP-W may be adjacent to the folding area FA1 (see reference). Figure 1a The corresponding parts, the non-folded parts NFP1-W and NFP2-W, can be the non-folded regions NFA1 and NFA2 (see reference). Figure 1a The corresponding part.

[0080] The window (WM) can be contained within an optically transparent insulating material. The window (WM) can protect the display panel (DP) and input sensors (IS), etc. The window (WM) can also be a cover window covering the upper part of the display module (DM).

[0081] The image IM generated on the display panel DP can be provided to the user through the window WM. The window WM can provide a touch surface for the display device ED. In the display device ED that includes the folding area FA1, the window WM can be a foldable flexible window.

[0082] The window WM can be provided as both a display surface and a touch surface, and exhibits excellent optical properties. One embodiment of the window WM can have a high transmittance of over 90% in the visible light region from 380 nm to 780 nm.

[0083] One embodiment of the window WM may include an overlay layer CVL (see reference). Figure 6a A window WM of one embodiment will be described in more detail below.

[0084] The display module (DM) can display images based on electrical signals and can send / receive information about external inputs. The display module (DM) may include a display area (DP-DA) and a non-display area (DP-NDA). The display area (DP-DA) can be defined as the area that transmits images provided by the display module (DM).

[0085] The non-display area DP-NDA is adjacent to the display area DP-DA. For example, the non-display area DP-NDA may surround the display area DP-DA. However, this is only illustrative, and the non-display area DP-NDA can be defined in various shapes and is not limited to one embodiment. According to one embodiment, the display area DP-DA of the display module DM may be adjacent to the effective area F-AA (refer to...). Figure 1a At least a part of ).

[0086] In one embodiment, the display module DM includes a display panel DP. The display panel DP can be a light-emitting display panel and is not particularly limited thereto. For example, the display panel DP can be an organic light-emitting display panel or an inorganic light-emitting display panel. The light-emitting layer of an organic light-emitting display panel can contain organic light-emitting materials. The light-emitting layer of an inorganic light-emitting display panel can contain quantum dots, quantum rods, etc.

[0087] The display module DM may also include an input sensor IS. The input sensor IS can be directly mounted on the display panel DP. The input sensor IS may include multiple detection electrodes. The input sensor IS can detect external input using self-capacitance or mutual capacitance. The input sensor IS can also detect input via an active input device.

[0088] The input sensor IS can be formed directly on the display panel DP during the manufacturing process using a continuous process. However, the embodiments are not limited to this; the input sensor IS can also be manufactured as a separate panel from the display panel DP and attached to the display panel DP by means of an adhesive layer (not shown).

[0089] Furthermore, the display module DM may also include an optical layer RCL. The optical layer RCL can reduce reflections caused by external light. For example, the optical layer RCL may include a polarizing layer or a color filter layer. However, the embodiments are not limited to this, and the optical layer RCL may include optical components for improving the display quality of the display device ED.

[0090] In one embodiment, the optical layer RCL can be directly disposed on the input sensor IS. Furthermore, if the input sensor IS is omitted from the display module DM, the optical layer RCL can be directly disposed on the display panel DP. However, the embodiments are not limited to this; the optical layer RCL can also be disposed on the display panel DP or the input sensor IS using a separate adhesive component.

[0091] The display module DM may include a foldable display unit FP-D and non-foldable display units NFP1-D and NFP2-D. The foldable display unit FP-D may be connected to the folding area FA1 (see reference). Figure 1a The corresponding parts, the non-folding display units NFP1-D and NFP2-D, can be the non-folding areas NFA1 and NFA2 (see reference). Figure 1a The corresponding part.

[0092] The folding display unit FP-D can be connected to the first folding axis FX1 (see reference). Figure 1b , Figure 1c The reference fold or bend corresponds to the part. The display module DM may include a first non-foldable display unit NFP1-D and a second non-foldable display unit NFP2-D, which may be separated from each other by the foldable display unit FP-D.

[0093] In a display device ED according to one embodiment, the lower module LM may include a support plate MP. Furthermore, in one embodiment, the lower module LM may also include at least one of a support module SM, a panel protective layer PF, and a buffer layer CPN. For example, the display device ED according to one embodiment may include a support plate MP disposed below a display module DM, a panel protective layer PF and a buffer layer CPN disposed between the support plate MP and the display module DM, and a support module SM disposed below the support plate MP.

[0094] In one embodiment, the support plate MP can be arranged below the display module DM. The support plate MP may include a folding support portion FP-MP and non-folding support portions NFP1-MP and NFP2-MP. The first non-folding support portion NFP1-MP and the second non-folding support portion NFP2-MP of the support plate MP can be separated from each other by the folding support portion FP-MP. The folding support portion FP-MP may be adjacent to the folding area FA1 (refer to...). Figure 1a The corresponding parts, the non-folding support parts NFP1-MP and NFP2-MP can be the non-folding areas NFA1 and NFA2 (refer to...). Figure 1a The corresponding part.

[0095] Reference Figure 3 and Figure 4A panel protective layer PF may be disposed between the display module DM and the support plate MP. The panel protective layer PF may be a layer disposed under the display module DM to protect the rear surface of the display module DM. The panel protective layer PF may overlap the entire display module DM. The panel protective layer PF may contain a polymer material. For example, the panel protective layer PF may be a polyimide film or a polyethylene terephthalate film. However, this is exemplary, and the material of the panel protective layer PF is not limited to these.

[0096] A display device ED according to one embodiment may include a support module SM. The support module SM may include a support portion SPM and a filler portion SAP. The support portion SPM may be a portion that overlaps with a large portion of the display module DM. The filler portion SAP may be a portion disposed outside the support portion SPM and overlapping with the outline of the display module DM.

[0097] The support module SM may include support layers SP1 and SP2. Support layers SP1 and SP2 may include a first sub-support layer SP1 and a second sub-support layer SP2 spaced apart from each other in the first direction DR1. The first sub-support layer SP1 and the second sub-support layer SP2 may be connected to the first folding axis FX1 (see reference). Figure 1b , Figure 1c The corresponding portions are separated from each other. Support layers SP1 and SP2 are provided as a first sub-support layer SP1 and a second sub-support layer SP2, which are separated from each other in the folding region FA1, thereby improving the folding or bending characteristics of the display device ED. In addition, although not shown, support layers SP1 and SP2 may include a configuration of a pad (not shown) and a lower support plate (not shown) stacked in the thickness direction.

[0098] The lower support plate (not shown) may be made of metallic or polymeric materials. For example, the lower support plate may be formed of stainless steel, aluminum, copper, or alloys thereof.

[0099] The padding layer (not shown) prevents the support plate MP from being pressed or deformed due to external impacts and forces. The padding layer (not shown) may include sponge, foam, or an elastic polymer such as polyurethane resin. Furthermore, the padding layer (not shown) may contain at least one of acrylic polymers, urethane polymers, silicone polymers, and imide polymers. However, the embodiments are not limited to these. The padding layer (not shown) may be disposed under the support plate MP or under the lower support plate (not shown).

[0100] Furthermore, the support module SM may also include at least one of a shielding layer EMP and an interlayer bonding layer ILP. The shielding layer EMP may be an electromagnetic wave shielding layer or a heat dissipation layer. Additionally, the shielding layer EMP can function as a bonding layer. The shielding layer EMP can be used to bond the support module SM to the housing HAU.

[0101] The support module SM may further include an interlayer bonding layer ILP disposed on the upper side of the support layers SP1 and SP2. The interlayer bonding layer ILP enables the support plate MP to be bonded to the support module SM. The interlayer bonding layer ILP may be provided in the form of a bonding resin layer or adhesive tape. For example, a portion of the interlayer bonding layer ILP that overlaps with the folding display portion FP-D may be removed. However, the embodiment is not limited to this, and the interlayer bonding layer ILP may overlap with the entire folding display portion FP-D.

[0102] The filler SAP can be arranged on the outer contour of the support layers SP1 and SP2. The filler SAP can be arranged between the support plate MP and the shell HAU. The filler SAP can fill the space between the support plate MP and the shell HAU and fix the support plate MP.

[0103] Reference Figure 3 and Figure 4 In one embodiment, the display device ED may include a buffer layer CPN in the lower module LM. The buffer layer CPN can function as a thickness compensation layer to compensate for the thickness of the lower side of the display module DM or as a support layer to support the display module DM. Alternatively, unlike the illustration, in one embodiment, the buffer layer CPN may be omitted.

[0104] In one embodiment of the display device ED, the combination of components included in the lower module LM can vary depending on the size, shape, or operating characteristics of the display device ED.

[0105] Furthermore, the display device ED in one embodiment may also include at least one adhesive layer AP1, AP2, or AP3. For example, the first adhesive layer AP1 may be disposed between the display module DM and the panel protective layer PF, the second adhesive layer AP2 may be disposed between the panel protective layer PF and the buffer layer CPN, and the third adhesive layer AP3 may be disposed between the support plate MP and the buffer layer CPN. At least one adhesive layer AP1, AP2, or AP3 may be an optically clear adhesive film (OCA) or an optically clear adhesive resin layer (OCR). However, the embodiment is not limited to this, and at least one adhesive layer AP1, AP2, or AP3 may also be an adhesive layer with a low transmittance of less than 80%.

[0106] Figure 5 This is a cross-sectional view of a display module according to an embodiment of the present invention.

[0107] Reference Figure 5 The display module DM may include a display panel DP, an input sensor IS, and an optical layer RCL. The display panel DP may include a base substrate BL, a circuit layer DP-CL, a light-emitting element layer DP-EL, and a packaging layer TFE.

[0108] The base substrate BL provides a foundation surface for arranging the DP-CL circuit layer. The base substrate BL can be a flexible substrate capable of bending, folding, rolling, etc. The base substrate BL can be a glass substrate, a metal substrate, or a polymer substrate. However, embodiments of the present invention are not limited to these; the base substrate BL can be an inorganic layer, an organic layer, or a composite material layer.

[0109] The base substrate BL can have a single-layer or multi-layer structure. In one embodiment, the base substrate BL can have a multi-layer structure. For example, the base substrate BL may include a first synthetic resin layer, multiple or single-layer inorganic layers, and a second synthetic resin layer disposed on the multiple or single-layer inorganic layers. Each of the first and second synthetic resin layers may contain a polyimide-type resin, and is not particularly limited thereto.

[0110] The circuit layer DP-CL can be disposed on the base substrate BL. The circuit layer DP-CL may include insulating layers, semiconductor patterns, conductive patterns, and signal lines, etc.

[0111] The light-emitting element layer DP-EL can be disposed on the circuit layer DP-CL. The light-emitting element layer DP-EL can include light-emitting elements. For example, light-emitting elements can include organic light-emitting materials, inorganic light-emitting materials, organic-inorganic light-emitting materials, quantum dots, quantum rods, micro LEDs, or nano LEDs.

[0112] The encapsulation layer TFE can be disposed on the light-emitting element layer DP-EL. The encapsulation layer TFE can protect the light-emitting element layer DP-EL from moisture, oxygen, and foreign matter such as dust particles. The encapsulation layer TFE may include at least one inorganic layer. The encapsulation layer TFE may include a stacked structure of inorganic / organic / inorganic layers.

[0113] The input sensor IS can be directly mounted on the display panel DP. The display panel DP and the input sensor IS can be formed through a continuous process. Here, "direct mounting" can mean that no third component is placed between the input sensor IS and the display panel DP. That is, no separate adhesive layer is required between the input sensor IS and the display panel DP.

[0114] The optical layer RCL can be directly disposed on the input sensor IS. The optical layer RCL can reduce the reflectivity of external light incident from outside the display device ED. In one embodiment, the optical layer RCL may include a polarizing layer or a color filter layer. In one embodiment of the invention, the positions of the input sensor IS and the optical layer RCL can be interchanged. For example, the optical layer RCL may include a polarizing layer, which can be bonded to the input sensor IS via an adhesive layer.

[0115] A polarizing layer can be manufactured by adsorbing dichroic dyes onto a stretched polymer film. For example, a polarizing layer can be manufactured by adsorbing iodine onto a stretched polyvinyl alcohol film. In this case, the direction in which the polymer film is stretched can be the absorption axis of the polarizing layer, and the direction perpendicular to the stretching direction can be the transmission axis of the polarizing layer.

[0116] The color filter layer may include multiple color filters. The color filters may have a predetermined arrangement. For example, the color filters may be arranged taking into account the emission colors of pixels included in the display panel (DP). Furthermore, the anti-reflective layer may include a black matrix adjacent to the color filters.

[0117] Figures 6a to 6c These are schematic cross-sectional views illustrating a configuration included in a display device ED according to one embodiment. Figures 6a to 6c The text is only briefly shown in the reference section. Figure 3 and Figure 4 The aforementioned display device ED includes the optical layer RCL, the window adhesive layer AP-W, and the window WM.

[0118] Additionally, refer to Figures 6a to 6c Windows WM, WM-1, and WM-2 of one embodiment described herein can be used as a reference. Figures 1a to 4 The window WM of the display device ED in one embodiment is included. (See also...) Figures 6a to 6c The windows WM, WM-1, and WM-2 described in one embodiment can be used as cover windows for the display device ED. Although not shown, they are shown according to reference. Figures 6a to 6c One embodiment of the described windows WM, WM-1, WM-2 may include a folding axis FX1 extending in one direction (see reference). Figure 3 At least one fold portion FP-W folded based on the reference ) Figure 3 ).

[0119] Reference Figure 6a According to an embodiment of the present invention, the window WM includes a cover layer CVL. The cover layer CVL can be disposed on the display module DM (see reference). Figure 3 The CVL overlay protects the display module DM (see reference). Figure 3To protect against external impacts. According to one embodiment, the window WM may further include a protective layer PL disposed on the cover layer CVL. Furthermore, according to one embodiment, the window WM may further include a protective adhesive layer AP-PL disposed between the cover layer CVL and the protective layer PL.

[0120] The following description of the overlay layer CVL included in the window WM applies not only to Figure 6a The window WM shown in one embodiment can also be applied in the same way to the reference window. Figure 6b , Figure 6c and Figures 7a to 7c The configuration of windows WM-1, WM-2, WM-3, WM-4, and WM-5 in one embodiment will be described below.

[0121] The CVL (CVtane Fiberglass Covering) comprises a base resin including at least one of a siloxane-epoxy compound, an epoxy (meth)acrylate compound, and a urethane (meth)acrylate compound, a siloxane-modified polyol, a diglycidyl ether compound, a photoinitiator, and a sensitizer. The CVL, by comprising a base resin including at least one of a siloxane-epoxy compound, an epoxy (meth)acrylate compound, and a urethane (meth)acrylate compound, a siloxane-modified polyol, a diglycidyl ether compound, a photoinitiator, and a sensitizer, can exhibit high hardness and excellent flexibility. Accordingly, the CVL can increase the impact resistance and folding properties of a window WM according to one embodiment.

[0122] The base resin serves as the primary adhesive for forming the CVL (CVtane Capping Layer). The base resin included in the CVL includes at least one of siloxane-epoxy compounds, epoxy (meth)acrylate compounds, and urethane (meth)acrylate compounds. The CVL may contain one or more of the following as a base resin: a siloxane-epoxy compound, an epoxy (meth)acrylate compound, and urethane (meth)acrylate compounds. Additionally, in this specification, (meth)acrylate can refer to both acrylates and methacrylates.

[0123] Siloxane-epoxy compounds exhibit high strength and flexibility. Epoxy (meth)acrylate compounds possess the excellent hardness, flexibility, and curability produced by epoxy resins. Ethyl carbamate (meth)acrylate compounds exhibit excellent curability, resulting in strong coatings and excellent curability even in high oxygen concentration environments. In foldable display devices, the cover layer CVL included in the window WM should be formed using a material with high strength and should exhibit a degree of flexibility in operations such as bending or folding. According to an embodiment of the invention, the cover layer CVL comprises a base resin including at least one of siloxane-epoxy compounds, epoxy (meth)acrylate compounds, and ethyl carbamate (meth)acrylate compounds, thereby ensuring excellent impact resistance and high flexibility.

[0124] In one embodiment, the base resin contained in the CVL cover layer can be a siloxane-epoxy compound. When the base resin includes a siloxane-epoxy compound, the hardness and flexural properties of the resulting CVL cover layer can be improved.

[0125] In one embodiment of the invention, the siloxane-epoxide compound can be formed as a condensate comprising an alkoxysilane having an epoxy group. For example, the condensate of an alkoxysilane having an epoxy group can be a siloxane resin comprising an epoxy group. However, the embodiments are not limited thereto. In this specification, the epoxy group included in the siloxane-epoxide compound can be one or more epoxy groups selected from aliphatic epoxy groups and aromatic epoxy groups, or can be a functional group containing thereto. Furthermore, the siloxane resin can refer to a polymer compound in which silicon atoms and oxygen form covalent bonds.

[0126] In one embodiment, the base resin may comprise 70 wt% to 80 wt% of 100% of the total CVL content of the cover layer. When the base resin comprises 70 wt% to 80 wt% of 100% of the total CVL content of the cover layer, the CVL cover layer can consistently exhibit high hardness and excellent folding properties.

[0127] In one embodiment, the siloxane-modified polyol contained in the cover layer CVL can be used as a crosslinking agent. The structure and properties of the siloxane-modified polyol in one embodiment can be similar to those of the base resin, thereby promoting crosslinking of the base resin. The siloxane-modified polyol can increase the degree of crosslinking of the base resin, thus improving the mechanical strength of the cover layer CVL and increasing its flexibility. Because the cover layer CVL contains the siloxane-modified polyol, it can exhibit high strength and excellent flexibility. Accordingly, the impact resistance and folding properties of the window WM including the cover layer CVL can be fully improved.

[0128] In this specification, siloxane-modified polyol can refer to a compound formed by an addition reaction of a polyol with an organosilicon compound containing a silicon-oxygen bond (Si-O) functional group. Furthermore, in this specification, a polyol refers to an organic compound containing multiple hydroxyl groups within its molecule. For example, a polyol can refer to an organic compound containing three or more hydroxyl groups within its molecule.

[0129] Examples of polyols are not particularly limited, but may include polycaprolactone polyols, polycarbonate polyols, polyester polyols, polyether polyols, polysulfide polyols, etc. In one embodiment, the siloxane-modified polyol may include caprolactone polyol. That is, the siloxane-modified polyol may be a siloxane-modified caprolactone polyol.

[0130] In one embodiment, 5 wt% to 10 wt% of siloxane-modified polyol may be included relative to 100% of the total CVL content of the capping layer. With 5 wt% to 10 wt% siloxane-modified polyol included relative to 100% of the total CVL content of the capping layer, curing reactivity can be improved, resulting in a film with excellent mechanical properties.

[0131] In one embodiment, the CVL (CVtaneous Color Layer) capping layer may contain epoxy-containing monomers as photopolymerizable monomers. The CVL capping layer may contain a diglycidyl ether compound as a photopolymerizable monomer. The diglycidyl ether compound may contain two epoxy groups, thereby inducing sufficient polymerization during exposure in the curing process, resulting in a film with excellent impact resistance and flexibility.

[0132] Diglycidyl ether compounds may include, for example, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, resorcinol diglycidyl ether, bisphenol A propoxylate diglycidyl ether, ethylene glycol diglycidyl ether, 1,4-cyclohexanedimethanol diglycidyl ether, glycerol diglycidyl ether, 1,4-butanediol diglycidyl ether, neopentyl glycol diglycidyl ether, and 1,3-butanediol diglycidyl ether. The diglycidyl ether compound may be bisphenol A diglycidyl ether, 1,3-bis(3-glycidoxypropyl)tetramethylsiloxane, or any combination thereof, but is not limited thereto. In one embodiment, the diglycidyl ether compound may be bisphenol A diglycidyl ether.

[0133] In one embodiment, the total content of the CVL (CVL cover layer) may include 1 wt% to 5 wt% of a diglycidyl ether compound relative to 100% of the total CVL content. When the total content of the CVL cover layer includes 1 wt% to 5 wt% of a diglycidyl ether compound relative to 100% of the total CVL content, the curing reactivity is improved, resulting in a film with excellent mechanical properties. When the content of the diglycidyl ether compound is less than 1 wt%, the curing efficiency may decrease, while when the content of the diglycidyl ether compound exceeds 5 wt%, the strength characteristics of the cured CVL cover layer may decrease.

[0134] The photoinitiator contained in the CVL capping layer of one embodiment may include at least one of iodonium salts, sulfonium salts, thallium salts, acetophenone compounds, sulfonium compounds, benzophenone compounds, and organohalides.

[0135] In the case of siloxane resins, cationic initiators can be used as substances that generate free radicals or ions upon UV irradiation. That is, cationic initiators that generate cations upon UV irradiation can be used. The type of cationic initiator is not particularly limited; for example, it can be triphenylmethyl chloride, thionyl halide, iodobenzene, etc. In the case of acrylate resins, acetophenone initiators, sulfonium salt initiators, and benzophenone initiators can be used. However, the type of initiator is not limited to these.

[0136] Iodotonium salt initiators may include, but are not limited to, diphenyliodonium, bis(p-tolyl)iodonium, bis(4-dodecylphenyl)iodonium, bis(4-methoxyphenyl)iodonium, (4-octoxyphenyl)phenyliodonium, bis(4-decoxyphenyl)iodonium, 4-(2-hydroxytetradecoxy)phenyliodonium, 4-isopropylphenyl(p-tolyl)iodonium, and 4-isobutylphenyl(p-tolyl)iodonium or any combination thereof.

[0137] Acetophenone initiators may include, for example, benzyl dimethyl ketal, 1-hydroxy-cyclohexylphenyl ketone, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 4-phenoxydichloroacetophenone, 4-tert-butyldichloroacetophenone, 4-tert-butyltrichloroacetophenone, 2,2-diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 1-(4-isopropylphenyl)-2-hydroxy-2-methyl-1-propanone, or any combination thereof, but are not limited thereto.

[0138] Benzophenone initiators may include, for example, benzophenone, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-dichlorobenzophenone, and 3,3'-dimethyl-2-methoxybenzophenone, or any combination thereof, but are not limited thereto.

[0139] In one embodiment, the photoinitiator may be included in 3 wt% to 5 wt% of the total CVL content relative to 100%. When the photoinitiator is included in 3 wt% to 5 wt% of the total CVL content relative to 100%, the curing efficiency can be improved, thereby minimizing the reduction in the physical properties of the cured CVL.

[0140] One embodiment of the capping CVL includes a sensitizer. The sensitizer included in the capping CVL can be a compound different from the initiator. The sensitizer can improve the polymerization reactivity and thus increase the mechanical strength of the capping CVL. Examples of sensitizers include, for instance, thioxanthone compounds, carbonyl compounds, diazo compounds, etc.

[0141] In one embodiment, the sensitizer may be a thioxanthone compound. Thioxanthone compounds may include, for example, isopropylthioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-diethylthioxanthone, and 2,4-diisopropylthioxanthone, or any combination thereof, but are not limited thereto. In one embodiment, the sensitizer may be isopropylthioxanthone.

[0142] In one embodiment, the sensitizer may be included in 1 wt% to 5 wt% of the total CVL content relative to 100%. With 1 wt% to 5 wt% sensitizer included in the total CVL content relative to 100%, curing efficiency can be improved, thereby minimizing the reduction in the physical properties of the cured CVL.

[0143] In a window WM according to one embodiment, relative to 100% of the total content of the cover layer CVL, the cover layer CVL may contain 70 wt% to 80 wt% of a base resin, 5 wt% to 10 wt% of a siloxane-modified polyol, 1 wt% to 5 wt% of a diglycidyl ether compound, 3 wt% to 5 wt% of a photoinitiator, and 1 wt% to 5 wt% of a sensitizer. When the contents of the base resin, siloxane-modified polyol, diglycidyl ether compound, photoinitiator, and sensitizer meet the above ranges, the curing reactivity of the cover layer CVL can be improved, and its impact resistance and flexibility can be enhanced.

[0144] In one embodiment, the modulus of the cover layer CVL at room temperature (25°C) can be above 500 MPa and below 1.5 GPa. In another embodiment, if the modulus of the cover layer CVL at room temperature (25°C) is less than 500 MPa, the surface hardness may decrease, thus reducing impact resistance. Furthermore, in another embodiment, if the modulus of the cover layer CVL at room temperature (25°C) exceeds 1.5 GPa, although the hardness increases, cracking may occur in the cover layer CVL because it cannot absorb bending or folding stress. By ensuring that the modulus of the cover layer CVL meets the above-mentioned range, the cover layer CVL has the advantage of high flexibility, and the durability of the display device ED can be maximized under physical driving conditions such as folding or bending.

[0145] In one embodiment, the thickness d of the cover layer CVL C It can be greater than 30μm and less than 75μm. The thickness d of the CVL capping layer...C For thicknesses less than 30 μm, sufficient impact resistance may not be observed, especially with a CVL coating thickness d. C With a thickness exceeding 75μm, the folding or bending characteristics of the display device (ED) may be reduced due to the increased thickness. This is because the thickness d of the CVL (CVtaneous Transformer Layer) is... C By meeting the above requirements, the CVL coating can maintain flexibility while exhibiting excellent hardness, thus demonstrating improved mechanical properties.

[0146] The window of a display device needs to exhibit excellent mechanical properties to protect the device from external stimuli, while also demonstrating a certain degree of flexibility during folding. In particular, since the window located at the top of the display device may be subject to external human contact, it may require high resistance to external impacts. However, it is difficult to simultaneously meet the impact resistance and flexibility requirements of a display device's window.

[0147] According to an embodiment of the present invention, the window may comprise a base resin including at least one of siloxane-epoxy compounds, epoxy (meth)acrylate compounds, and urethane (meth)acrylate compounds, a siloxane-modified polyol, a diglycidyl ether compound, a photoinitiator, and a sensitizer, thereby exhibiting both excellent impact resistance and excellent folding properties. Thus, the window of one embodiment can be used as a cover window for a foldable display device.

[0148] A display device according to an embodiment of the present invention includes a folding region and a non-folding region, and includes a window disposed on a display module and including a cover layer, the cover layer comprising a base resin including at least one of siloxane-epoxy compounds, epoxy (meth)acrylate compounds and urethane (meth)acrylate compounds, a siloxane-modified polyol, a diglycidyl ether compound, a photoinitiator and a sensitizer, thereby exhibiting excellent impact resistance and excellent folding properties.

[0149] Refer again Figure 6a According to one embodiment, the window WM may further include a protective layer PL disposed on the cover layer CVL. The protective layer PL may be disposed on the cover layer CVL. The protective layer PL may be separated from the display module DM (see reference DM) by the cover layer CVL. Figure 3 The protective layer PL can be arranged above the cover layer CVL to protect the window WM from the influence of the external environment. However, in one embodiment of the display device ED, the protective layer PL and the protective adhesive layer AP-PL can be omitted, and the cover layer CVL can be the uppermost surface of the display device ED.

[0150] A protective adhesive layer AP-PL may also be disposed between the cover layer CVL and the protective layer PL. The protective adhesive layer AP-PL may be an optically clear adhesive layer. In one embodiment, when the display device ED includes a protective layer PL, the protective layer PL may be a layer exposed to the outside from the display device ED.

[0151] The protective layer PL may include a polymer film. Furthermore, the protective layer PL may use a polymer film as a base layer, and may further include functional layers such as a hard coating, an anti-fingerprint coating, or an antistatic coating on the base layer. Additionally, the protective layer PL used in a display device ED in one embodiment may be flexible.

[0152] In one embodiment, the protective layer PL may be disposed on top of the cover layer CVL. The protective layer PL may be a functional layer that protects the upper surface of the cover layer CVL.

[0153] According to one embodiment, the protective layer PL may comprise polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl methacrylate (PMMA), polystyrene (PS), polyvinyl chloride (PVC), polyethersulfone (PES), polypropylene (PP), polyamide (PA), modified polyphenylene ether (m-PPO), polyoxymethylene (POM), polysulfone (PSU), and polyphenylene sulfide (PPS). The protective layer PL can be at least one polymeric resin selected from the following: polysulfide, polyimide (PI), polyethyleneimine (PEI), polyether ether ketone (PEEK), polyamide imide (PAI), polyarylate (PAR), and thermoplastic polyurethane (TPU). The protective layer PL can be a polymeric film layer; for example, in one embodiment, the protective layer PL can be a polyethylene terephthalate (PET) film or a thermoplastic polyurethane (TPU) film.

[0154] In one embodiment of the display device ED, the window WM can be arranged on the display module DM (see reference). Figure 3 The window WM can be placed on the display module DM (see reference). Figure 3 The optical layer RCL is included in the ( ). The window WM can be connected to the display module DM (see) via the window adhesive layer AP-W. Figure 3 (This is combined with the optical layer RCL.) In one embodiment, the CVL cover layer can be disposed on the optical layer RCL. Figure 6a As shown, the cover layer CVL can be bonded to the optical layer RCL via the window adhesive layer AP-W. However, the embodiments are not limited to this. In one embodiment of the display device ED, the window adhesive layer AP-W can be omitted, and the cover layer CVL can also be directly disposed on the optical layer RCL.

[0155] Reference Figure 6b According to one embodiment, the window WM-1 may further include a base layer BS disposed below the cover layer CVL. The base layer BS may be disposed between the cover layer CVL and the optical layer RCL. The cover layer CVL may be separated from the display module DM (see reference 1) by the base layer BS. Figure 3 They are arranged separately. The CVL overlay can be placed directly on the base layer BS.

[0156] The base layer BS can be formed using polymer materials. The base layer BS can be a flexible polymer film. In one embodiment, the base layer BS can have high transparency, high mechanical strength, high thermal stability, excellent moisture resistance, and optical isotropy.

[0157] The base layer BS can be manufactured using the following materials: polyimide resins; polyaramid resins; polyester resins such as polyethylene terephthalate, polyethylene isophthalate, or polybutylene terephthalate; cellulose resins such as diacetylcellulose or triacetylcellulose; polycarbonate resins; acrylic resins such as poly(methyl methacrylate) or poly(ethyl methacrylate); styrene resins such as polystyrene-acrylonitrile-styrene copolymer; polyolefin resins such as polyethylene, polypropylene, polyolefin resins having cyclic or norbornene structures, and ethylene-propylene copolymer; polyethersulfone resins; or sulfone resins, etc. Furthermore, the base layer BS can be formed using only one of the above resins, or formed by a mixture of two or more resins. However, the type of resin constituting the base layer BS is not limited to these. In window WM-1 of one embodiment, the base layer BS can be a polyethylene terephthalate film.

[0158] The thickness d of the base layer BS B It can be greater than 20μm and less than 50μm. The thickness d of the base layer BS... B For thicknesses less than 20 μm, the durability of window WM-1 may decrease. Furthermore, the thickness d of the base layer BS... B When the thickness is greater than 50μm, the thickness of the window WM-1 increases, which may not be suitable for realizing display devices with thin thickness or foldable display devices.

[0159] The base layer BS can be a single polymer film. However, the embodiments are not limited to this, and the base layer BS can also be provided in the form of a stack of multiple polymer film layers.

[0160] In one embodiment of the display device ED, window WM-1 can be arranged on the display module DM (see reference). Figure 3 The WM-1 window can be placed on the display module DM (see reference). Figure 3 The optical layer RCL is included in the (see) window WM-1. The window WM-1 can be connected to the display module DM (see) via the window adhesive layer AP-W. Figure 3 The window WM-1 in one embodiment may include a base layer BS, a cover layer CVL, a protective adhesive layer AP-PL, and a protective layer PL stacked sequentially along the third direction DR3. In one embodiment, the base layer BS may be disposed directly on the window adhesive layer AP-W, and the cover layer CVL may be disposed directly on the base layer BS.

[0161] and Figure 6a Compared to the display device ED of the embodiment shown, Figure 6c The difference in the display device ED shown in one embodiment is that the window adhesive layer AP-W is omitted.

[0162] Reference Figure 6c According to one embodiment, the window WM-2 includes a cover layer CVL, a protective adhesive layer AP-PL, and a protective layer PL, which are sequentially stacked along a third direction DR3, which is the thickness direction. The window WM-2 of one embodiment can be directly disposed on the display module DM (see reference). Figure 3 (above) For example Figure 6c As shown, the overlay layer CVL can be directly placed on the display module DM (refer to...). Figure 3 The CVL (Cover Layer) can be directly placed on the RCL (Optical Layer). The lower surface of the CVL can contact the RCL.

[0163] Additionally, although not shown, but Figure 6c The window WM-2 of one embodiment shown may further include a base layer BS disposed below the cover layer CVL (see reference). Figure 6b In this case, in window WM-2 according to one embodiment, the base layer BS ( Figure 6b It can be directly placed on the optical layer RCL.

[0164] In addition, for Figure 6b and Figure 6c The components included in windows WM-1 and WM-2 according to one embodiment shown can be similarly applied to the above-described configuration. Figure 6a The description of the structure included in window WM. That is, in windows WM-1 and WM-2 of one embodiment, the same applies to the cover layer CVL, the protective adhesive layer AP-PL, and the protective layer PL as to the reference. Figure 6a Description of the cover layer CVL, the protective adhesive layer AP-PL, and the protective layer PL.

[0165] Figures 7a to 7c These are schematic cross-sectional views illustrating a configuration included in a display device ED according to one embodiment. Figures 7a to 7c The image is shown only schematically. Figure 3 and Figure 4The display device ED described herein includes the optical layer RCL, the window adhesive layer AP-W, and the window WM. Hereinafter, with reference to... Figures 7a to 7c When describing windows WM-3, WM-4, and WM-5 according to an embodiment of the present invention, references will be omitted. Figures 6a to 6c The content described is the same, and the differences will be explained in detail.

[0166] Additionally, refer to Figures 7a to 7c Windows WM-3, WM-4, and WM-5, as described in one embodiment, may include references. Figures 1a to 4 The window WM of the display device ED according to one embodiment is described above. (See also...) Figures 7a to 7c Windows WM-3, WM-4, and WM-5, as described in one embodiment, can be used as cover windows for a display device ED. Although not shown, reference is made to... Figures 7a to 7c The windows WM-3, WM-4, and WM-5 described according to one embodiment may include a folding axis FX1 extending in one direction (see reference). Figure 3 At least one fold portion FP-W folded based on the reference ) Figure 3 ).

[0167] and Figures 6a to 6c Compared to the windows WM, WM-1, and WM-2 shown in the embodiments respectively, Figures 7a to 7c The differences between windows WM-3, WM-4, and WM-5 according to one embodiment shown are that the protective layer PL and the protective adhesive layer AP-PL are omitted, and a functional layer AF is included. Additionally, for Figures 7a to 7c The components included in windows WM-3, WM-4, and WM-5 according to one embodiment shown above can be used to... Figures 6a to 6c The same applies to the description of the components included in windows WM, WM-1, and WM-2.

[0168] Reference Figure 7a According to one embodiment, the window WM-3 may include a cover layer CVL and a functional layer AF disposed on the cover layer CVL. The functional layer AF may be disposed on top of the cover layer CVL. The functional layer AF may be separated from the display module DM (see reference DM) by the cover layer CVL. Figure 3 The functional layer AF can be directly disposed on the cover layer CVL. Alternatively, the functional layer AF can be disposed on the cover layer CVL via an adhesive layer (not shown). In a window WM-3 according to one embodiment, the functional layer AF can be disposed on the outermost edge of the window WM-3.

[0169] The functional layer AF can be constructed using a single layer or multiple layers. The functional layer AF may include at least one of a hard coating layer, an anti-fingerprint layer, and an anti-scattering layer. In one embodiment, the functional layer AF may include at least one of a hard coating material and an anti-fingerprint material.

[0170] In cases where the functional layer AF includes a hard coating, the hard coating can serve to protect the window WM-3 or the display module DM (see reference). Figure 3 The hard coating layer can contain a hard coating material. The hard coating layer can be formed from a hard coating resin comprising at least one of organic compositions, inorganic compositions, and organic-inorganic composite compositions. For example, the hard coating material forming the hard coating layer can include at least one of acrylate compounds, siloxane compounds, and silsesquioxane compounds. Furthermore, the hard coating material can also include inorganic particles. The hard coating layer can be an organic layer, an inorganic layer, or an organic-inorganic composite layer.

[0171] When the functional layer AF includes an anti-fingerprint layer, the anti-fingerprint layer can improve the stain resistance of window WM-3. The anti-fingerprint layer may contain an anti-fingerprint material. The anti-fingerprint material may include a water-repellent or oil-repellent material. For example, the anti-fingerprint material may include a fluorinated compound. The fluorinated compound may include at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and amorphous fluorine (Teflon AF, Cytop).

[0172] The thickness of the functional layer AF can be less than 10 μm. For example, the thickness of the functional layer AF can be more than 1 μm and less than 10 μm. When the thickness of the functional layer AF is less than 1 μm, the protective window WM-3 or the display module DM (refer to...) Figure 3 The function of the display device ED (refer to) is reduced, thereby reducing the functionality of the display device ED (refer to) Figure 3 The durability of the functional layer AF may decrease. Furthermore, when the thickness of the functional layer AF exceeds 10 μm, the thickness of the window WM-3 increases, which may be unsuitable for achieving thin or foldable display devices. When the thickness of the functional layer AF meets the aforementioned range, the functional layer AF can simultaneously exhibit excellent durability characteristics. Therefore, the window WM-3 including the functional layer AF can maintain flexibility while possessing excellent rigidity and exhibit improved mechanical properties.

[0173] In one embodiment of the display device ED, window WM-3 can be arranged on the display module DM (see reference). Figure 3 The WM-3 window can be placed on the display module DM (see reference). Figure 3 The optical layer RCL is included in the ( ). The window WM can be connected to the display module DM (see) via the window adhesive layer AP-W. Figure 3 (This is combined with the optical layer RCL.) In one embodiment, the CVL cover layer can be disposed on the optical layer RCL. Figure 7aAs shown, the cover layer CVL can be bonded to the optical layer RCL via the window adhesive layer AP-W. However, the embodiments are not limited to this. In one embodiment of the display device ED, the window adhesive layer AP-W can be omitted, and the cover layer CVL can be directly disposed on the optical layer RCL.

[0174] Reference Figure 7b ,and Figure 7a Compared to the window WM-3 of the embodiment shown, Figure 7b The difference in the window WM-4 shown according to one embodiment is that it also includes a base layer BS. The base layer BS can be disposed below the cover layer CVL. The base layer BS can be disposed between the cover layer CVL and the optical layer RCL. The cover layer CVL can be separated from the display module DM (see reference 1) by the base layer BS. Figure 3 Arrange them separately.

[0175] and Figure 7a Compared to the display device ED of the embodiment shown, Figure 7c The difference in the display device ED shown in one embodiment is that the window adhesive layer AP-W is omitted.

[0176] Reference Figure 7c According to one embodiment, the window WM-5 can be directly arranged on the display module DM (see reference). Figure 3 (above) For example Figure 7c As shown, the overlay layer CVL can be directly placed on the display module DM (refer to...). Figure 3 The CVL (Cover Layer) can be directly placed on the RCL (Optical Layer). The lower surface of the CVL can contact the RCL.

[0177] Additionally, although not shown, but Figure 7c The window WM-5 of one embodiment shown may further include a base layer BS disposed below the cover layer CVL (see reference). Figure 7b In this case, in window WM-5 of one embodiment, the base layer BS ( Figure 7b It can be directly placed on the optical layer RCL.

[0178] Hereinafter, a window and a display device including the window according to an embodiment will be described in more detail through examples and comparative examples. However, the following examples and comparative examples are merely illustrative of the invention for more detailed explanation, and the invention is not limited to the following examples and comparative examples.

[0179] (Evaluation of the display device 1) Table 1 below shows the thickness of each component in the windows included in Examples 1-1 to 1-3, Examples 2-1 to 2-3, and Comparative Examples 1, 1-1, 1-2, 2-1, and 2-2. In Table 1, a thickness of "0" indicates that the corresponding component is not included. In Table 1, Comparative Example 1 is a case of a stacked structure including a window containing a glass substrate (UTG: Ultra-Thin Glass) and a display module, and Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Examples 1-1, 1-2, 2-1, and 2-2 are cases of stacked structures including a window containing a cover layer and a display module, respectively. The windows included in Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Examples 1-1, 1-2, 2-1, and 2-2 can have Figure 6b Window structure.

[0180] In Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Examples 1-1, 1-2, 2-1, and 2-2, polyethylene terephthalate (PET) film was used as the base layer. Furthermore, in Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Examples 1-1, 1-2, 2-1, and 2-2, the capping layer comprised a siloxane-epoxy resin, a siloxane-modified polyol, a diglycidyl ether compound, a photoinitiator, and a sensitizer. A siloxane-modified caprolactone polyol was used as the siloxane-modified polyol, bisphenol A diglycidyl ether was used as the diglycidyl ether compound, diphenyliodine chloride was used as the photoinitiator, and isopropylthioxanone was used as the sensitizer. In addition, in Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Examples 1-1, 1-2, 2-1 and 2-2, the thickness and material composition of the remaining stacked structures are the same.

[0181] [Table 1]

[0182] Examples 1-1 to 1-3 differ from Examples 2-1 to 2-3 in the thickness of the base layer. In Examples 1-1 to 1-3, the thickness of the base layer is 23 μm, while in Examples 2-1 to 2-3, the thickness of the base layer is 50 μm. Example 1-1 comprises a window consisting of a 23 μm base layer, a 30 μm capping layer, a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially. Example 1-2 comprises a window consisting of a 23 μm base layer, a 50 μm capping layer, a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially. Example 1-3 comprises a window consisting of a 23 μm base layer, a 75 μm capping layer, a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially.

[0183] Example 2-1 includes a window consisting of a 50μm base layer, a 30μm capping layer, a 35μm protective adhesive layer, and an 80μm protective layer stacked sequentially. Example 2-2 includes a window consisting of a 50μm base layer, a 50μm capping layer, a 35μm protective adhesive layer, and an 80μm protective layer stacked sequentially. Example 2-3 includes a window consisting of a 23μm base layer, a 75μm capping layer, a 35μm protective adhesive layer, and an 80μm protective layer stacked sequentially.

[0184] Compare Example 1 with... Figure 6b The case where the base layer and cover layer are omitted in the window structure and replaced with a glass substrate (UTG). Comparative Example 1 includes a window consisting of a 30 μm glass substrate (UTG), a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially.

[0185] Compared to Examples 1-1 to 1-3, Comparative Example 1-1 corresponds to a window with a cover layer thickness of less than 30 μm. Specifically, Comparative Example 1-1 comprises a window consisting of a 23 μm base layer, a 25 μm cover layer, a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially. Compared to Examples 1-1 to 1-3, Comparative Example 1-2 corresponds to a window with a cover layer thickness exceeding 75 μm. Specifically, Comparative Example 1-2 comprises a window consisting of a 23 μm base layer, an 80 μm cover layer, a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially.

[0186] Compared to Examples 2-1 to 2-3, Comparative Example 2-1 corresponds to a window with a cover layer thickness of less than 30 μm. Specifically, Comparative Example 2-1 comprises a window consisting of a 50 μm base layer, a 25 μm cover layer, a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially. Compared to Examples 2-1 to 2-3, Comparative Example 2-2 corresponds to a window with a cover layer thickness greater than 75 μm. Specifically, Comparative Example 2-2 comprises a window consisting of a 50 μm base layer, an 80 μm cover layer, a 35 μm protective adhesive layer, and an 80 μm protective layer stacked sequentially.

[0187] Table 2 below compares and shows the reliability test results of the display devices of Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Example 1, Comparative Example 1-1, Comparative Example 1-2, Comparative Example 2-1, and Comparative Example 2-2, based on the characteristics evaluated by the ball drop test, the push force test, and the repulsive force and torque values ​​of the folding operation. In Table 2, the ball drop characteristic evaluation evaluates the time point at which the window begins to crack when a load hammer is dropped from a predetermined height, thereby evaluating the height at which the crack begins to appear. The push force characteristic evaluation evaluates the time point at which the window begins to crack when pressure is applied to the front surface of the display device using a pen at a predetermined speed, thereby evaluating the final load at the time point at which the crack begins to appear. The ball drop characteristic evaluation was performed in both the non-folding and folding areas of the display device, and the results are shown in Table 2.

[0188] [Table 2]

[0189] Referring to the results in Table 2, in the cases of Examples 1-1 to 1-3 and Examples 2-1 to 2-3, improved values ​​were observed in the drop ball and pen pressure tests compared to Comparative Example 1. Unlike the examples, in Comparative Example 1, which included a glass substrate, damage to the non-folding portion of the window occurred at a height of 7 cm and damage to the folding portion of the window occurred at a height of 6 cm when evaluating drop ball impact resistance. In contrast, in the cases of Examples 1-1 to 1-3 and Examples 2-1 to 2-3, damage to the non-folding portion of the window occurred at a height of 8 cm or more and damage to the folding portion of the window occurred at a height of 7 cm or more when evaluating drop ball impact resistance. Furthermore, in the case of Comparative Example 1, damage to the window occurred at a pen pressure of 1.1 kgf when evaluating pen pressure impact resistance. In contrast, in the cases of Examples 1-1 to 1-3 and Examples 2-1 to 2-3, damage to the window occurred at a pen pressure of 1.3 kgf when evaluating pen pressure impact resistance.

[0190] Therefore, it can be confirmed that, in the cases of Examples 1-1 to 1-3 and Examples 2-1 to 2-3, the windows exhibited better performance than Comparative Example 1 in the ball drop and pen pressure tests. That is, it can be confirmed that, compared with the window according to Comparative Example 1, the windows of the Examples have improved impact resistance to external impacts.

[0191] Examples 1-1 to 1-3 differ from Examples 2-1 to 2-3 in the thickness of the base layer. In Comparative Example 1, which includes a glass substrate, the repulsive force exhibits a value of 2.29. In contrast, in Examples 1-1 to 1-3, the repulsive force exhibits a value of 2.27 or less, indicating a lower repulsive force compared to Comparative Example 1. In Examples 2-1 to 2-3, the repulsive force exhibits a value of 2.57 or more, indicating a higher repulsive force compared to Examples 1-1 to 1-3 and Comparative Example 1. Therefore, it can be confirmed that by adjusting the thickness of the base layer included in the window to less than 50 μm, the repulsive force can be reduced.

[0192] Comparing the torque values ​​of the embodiments and Comparative Example 1 in Table 2, Comparative Example 1, which includes a glass substrate, exhibits a torque value of 15.57. In contrast, Embodiments 1-1 to 1-3 exhibit torque values ​​of 15.44 or less, thus confirming a smaller torque value than Comparative Example 1. In the cases of Embodiments 2-1 to 2-3, a high torque value is confirmed when compared with Embodiments 1-1 to 1-3 and Comparative Example 1. Therefore, it can be confirmed that by adjusting the thickness of the base layer included in the window to less than 50 μm, the torque value applied to the window can be reduced. That is, when the thickness of the base layer is 20 μm or more and less than 50 μm, excellent folding reliability can be exhibited while maintaining high impact resistance.

[0193] Examples 1-1 to 1-3 exhibit excellent flexibility while maintaining higher impact resistance than Comparative Example 1. Compared to Comparative Example 1, Examples 1-1 to 1-3 demonstrate high impact resistance to external impacts and excellent folding characteristics. The thickness of the base layer included in Examples 2-1 to 2-3 corresponds to a thickness greater than that of the base layer included in Examples 1-1 to 1-3. Comparing the results of Examples 1-1 to 1-3 with those of Examples 2-1 to 2-3, it can be confirmed that in Examples 2-1 to 2-3, where the base layer thickness is 50 μm or more, similar values ​​to Examples 1-1 to 1-3 are observed in the ball drop and pen pressure tests, but with increased repulsive force and torque values. In contrast, in Examples 1-1 to 1-3, excellent performance is observed in the ball drop and pen pressure tests, exhibiting low repulsive force and low torque values. Therefore, it can be seen that when the thickness of the base layer is within the range of 20μm or more and less than 50μm, the window of one embodiment has high impact resistance and good folding characteristics.

[0194] Comparative Examples 1-1 and 1-2 differ from Examples 1-1 to 1-3 in terms of the thickness of the capping layer. Comparative Example 1-1 corresponds to a capping layer thickness of less than 30 μm compared to Examples 1-1 to 1-3. In the case of Comparative Example 1-1, it was confirmed that it exhibited lower repulsive force and lower torque values ​​compared to Examples 1-1 to 1-3, but showed reduced performance in the drop ball and pen pressure tests. Comparative Example 1-2 corresponds to a capping layer thickness exceeding 75 μm compared to Examples 1-1 to 1-3. In the case of Comparative Example 1-2, it was confirmed that it exhibited higher values ​​in the drop ball and pen pressure tests compared to Examples 1-1 to 1-3, but the repulsive force and torque values ​​increased. In contrast, in the cases of Examples 1-1 to 1-3, it was confirmed that the thickness of the capping layer exhibited excellent performance in the drop ball and pen pressure tests, and showed low repulsive force and low torque values. That is, it can be seen that when the thickness of the covering layer is in the range of 30μm or more and 75μm or less, the window of one embodiment has high impact resistance and good folding characteristics.

[0195] Similarly, comparing Comparative Examples 2-1 and 2-2 with Examples 2-1 to 2-3, in the case of Comparative Example 2-1, where the thickness of the cover layer is less than 30 μm, it was confirmed that compared with Examples 2-1 to 2-3, it exhibited lower repulsive force and lower torque values, but showed reduced performance in the drop ball and pen pressure tests. In the case of Comparative Example 2-2, where the thickness of the cover layer exceeds 75 μm, it was confirmed that compared with Examples 2-1 to 2-3, it exhibited higher values ​​in the drop ball and pen pressure tests, but the repulsive force and torque values ​​increased. Therefore, it can be confirmed that by adjusting the thickness of the cover layer included in the window to be more than 30 μm and less than 75 μm, the impact resistance and folding reliability of the window can be improved simultaneously.

[0196] (Evaluation of the display device 2) Table 3 below shows the thickness of each component included in the window in Examples 3-1 to 3-3 and Comparative Example 1. In Table 3, a thickness of "0" indicates that the corresponding component is not included. In Table 3, Comparative Example 1 is a case of a stacked structure including a window containing a glass substrate (UTG) and a display module, and Examples 3-1 to 3-3 are stacked structures including a window containing a cover layer and a display module, respectively. In Table 3, Comparative Example 1 may have the same structure as Comparative Example 1 described in Table 1. Furthermore, in Examples 3-1 to 3-3, the material composition of each component may be the same as in the examples described in Table 1.

[0197] [Table 3]

[0198] The surface quality index (Kc) of the display devices according to Examples 3-1 to 3-3 and Comparative Example 1 is measured and shown in Table 4 below. The surface quality index (Kc) was measured using a surface quality measuring device (Optimp).

[0199] [Table 4]

[0200] The results in Table 4 confirm that the surface quality indices of Examples 3-1 to 3-3 are lower than those of Comparative Example 1. A lower surface quality index (Kc) indicates a smoother surface. Examples 3-1 to 3-3 can have a higher surface quality than Comparative Example 1, thus exhibiting a smoother upper surface. The display devices of these examples include a window with a cover layer, thereby exhibiting improved surface quality characteristics compared to the display device of Comparative Example 1, which includes a glass substrate.

[0201] The above description refers to preferred embodiments of the present invention. However, it will be understood by those skilled in the art or those with ordinary instruction in the art that the present invention pertains to, that various modifications or alterations can be made to the present invention without departing from the concept and technical scope of the invention as set forth in the claims. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be determined by the claims.

Claims

1. A window, comprising: Overlay, The overlay layer includes: The base resin includes at least one of siloxane-epoxy compounds, epoxy (meth)acrylate compounds, and urethane (meth)acrylate compounds; Siloxane-modified polyols; Diglycidyl ether compounds; Photoinitiators; and Sensitizer.

2. The window according to claim 1, wherein, The thickness of the covering layer is greater than 30 μm and less than 75 μm.

3. The window according to claim 1, wherein, Relative to the total content of the covering layer (100 wt%), it comprises: 70wt% to 80wt% of the base resin; 5 wt% to 10 wt% of the siloxane-modified polyol; 1 wt% to 5 wt% of the diglycidyl ether compound; 3 wt% to 5 wt% of the photoinitiator; and The sensitizer is 1 wt% to 5 wt%.

4. The window according to claim 1, wherein, The base resin is a siloxane-epoxy compound.

5. The window according to claim 1, wherein, The siloxane-modified polyols include caprolactone polyols.

6. The window according to claim 1, wherein, The photoinitiator includes at least one of iodonium salts, sulfonium salts, thallium salts, acetophenone compounds, sulfonium compounds, benzophenone compounds, and organohalides.

7. The window according to claim 1, wherein, The sensitizer is a thioxanone compound.

8. The window according to claim 1, wherein, The modulus of the capping layer is above 500 MPa and below 1.5 GPa.

9. The window according to claim 1, wherein, The window also includes a base layer disposed beneath the covering layer. The base layer includes a polyethylene terephthalate film.

10. The window according to claim 9, wherein, The thickness of the base layer is greater than 20 μm and less than 50 μm.

11. The window according to claim 1, wherein, The window also includes: A protective layer is disposed on the covering layer; and A protective adhesive layer is disposed between the protective layer and the cover layer.

12. The window according to claim 1, wherein, The window also includes a functional layer disposed on the covering layer and containing a fluorinated compound. The thickness of the functional layer is less than 10 μm.

13. A display device, comprising: Display module; as well as The window according to any one of claims 1 to 12 is arranged on the display module.

14. The display device according to claim 13, wherein, The base layer of the window is arranged between the display module and the cover layer, and includes a polymer film.

15. The display device according to claim 14, wherein, The covering layer included in the window is arranged directly on the base layer.

16. The display device according to claim 14, further comprising: A window adhesive layer is disposed between the display module and the window. The base layer is directly disposed on the window adhesive layer. The cover layer is disposed directly on the base layer.

17. The display device according to claim 13, wherein, The display module includes: Basic substrate; A circuit layer is disposed on the base substrate; A light-emitting element layer is disposed on the circuit layer; An encapsulation layer is disposed on the light-emitting element layer; and An optical layer is disposed on the encapsulation layer. The optical layer includes a polarizing layer or a color filter layer.

18. The display device according to claim 17, wherein, The cover layer is disposed directly on the optical layer.

19. The display device according to claim 17, further comprising: A window adhesive layer is disposed between the optical layer and the cover layer. The covering layer is directly disposed on the window adhesive layer.

20. The display device according to claim 13, comprising: At least one fold is folded with reference to a folding axis extending in one direction.

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