Display device

Abstract

A display device includes a display panel. The display device also includes a backplane disposed below the display panel. The display device also includes a plate assembly disposed below the back plate. The back plate and the plate assembly are coupled by a first engagement member, the display panel and the back plate are coupled by a second engagement member, and the first engagement member is formed thicker than the second engagement member.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2024-0028012 filed on February 27, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. Technical Field

[0003] This specification relates to a display device. Background Art

[0004] Image display devices that implement various information on a screen are key technologies in the information and communication age, and include cathode ray display panels, liquid crystal display panels, electrophoretic display panels, organic light emitting display panels, and the like.

[0005] In particular, organic light emitting display panels and the like that display images by controlling the amount of light emitted by organic light emitting elements are attracting attention for realizing thinner, lighter, portable, and high-performance image display devices.

[0006] Because the organic light emitting display panel is implemented as a self-luminous display panel without a separate light source device, the organic light emitting display panel can be made lightweight and thin. In addition, the thin organic light emitting display panel can be manufactured, which makes it easy to realize a foldable display device.

[0007] At the same time, the foldable display device has a plate assembly to protect its rear surface and enhance rigidity. The plate assembly is crucial to achieving foldability. However, when a rigid component such as a plate assembly is bonded to a film, an orange peel phenomenon may occur on the upper part of the display device. The orange peel phenomenon refers to a defect with an orange peel-like pattern that appears on the surface of the display device. The orange peel phenomenon mainly refers to the phenomenon that the surface of a display device that needs to be flat becomes uneven due to slight unevenness, and the orange peel phenomenon may have an adverse effect on quality. The orange peel phenomenon is usually observed on the outer layers of the display device, such as cover windows, plastic covers, and protective films. Summary of the Invention

[0008] An object to be achieved by the present disclosure is to provide a display device in which a board assembly is provided on a rear surface of the display device and an orange peel phenomenon does not occur on a front surface.

[0009] The objects of the present disclosure are not limited to the above-mentioned objects, and other objects not mentioned above may be clearly understood by those skilled in the art from the following description.

[0010] In order to achieve the above-mentioned purpose, an embodiment of the present disclosure provides a display device, which includes: a display panel; a back panel arranged below the display panel; and a board assembly arranged below the back panel, wherein the back panel and the board assembly are coupled by a first bonding member, the display panel and the back panel are coupled by a second bonding member, and the first bonding member is formed to be thicker than the second bonding member.

[0011] Other details of the exemplary embodiments are included in the detailed description and the accompanying drawings.

[0012] The present disclosure can reduce the orange peel phenomenon on a foldable display device.

[0013] The effects of the present disclosure are not limited to the aforementioned effects, and other effects not mentioned above will be apparently understood by those of ordinary skill in the art from the following description.

[0014] The above-mentioned objects to be achieved by the present disclosure, means for achieving the objects, and effects of the present disclosure do not specify essential features of the claims, and therefore, the scope of the claims is not limited to the disclosure of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is an exploded view of a display device according to an embodiment of the present disclosure;

[0017] Figure 2 is a cross-sectional view of a display device according to an embodiment of the present disclosure;

[0018] Figure 3 This is a view used to illustrate the phenomenon of cellulite;

[0019] Figure 4 is a partial cross-sectional view of a display device according to an embodiment of the present disclosure; and

[0020] Figure 5 is a partial cross-sectional view of a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] The advantages and features of the present disclosure and methods for achieving these advantages and features will be apparent by reference to the exemplary embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the exemplary embodiments disclosed herein, but will be implemented in various forms. The exemplary embodiments are provided only as examples so that those skilled in the art can fully understand the disclosure and scope of the present disclosure.

[0022] The shapes, sizes, ratios, angles, numbers, etc. shown in the accompanying drawings for describing the exemplary embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto. Throughout the specification, similar reference numerals generally represent similar elements. In addition, in the following description of the present disclosure, detailed descriptions of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure.

[0023] Terms such as “including,” “having,” and “consisting of…” used herein are generally intended to allow for the addition of other components unless these terms are used with the term “only.” Any reference to the singular may include the plural unless expressly stated otherwise.

[0024] Even if not explicitly stated, the components are interpreted as including the ordinary error range.

[0025] When terms such as "on," "above," "below," and "beside" are used to describe the positional relationship between two parts, one or more parts may be located between the two parts, unless these terms are used with the terms "immediately" or "directly" without being used.

[0026] When an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer, or intervening elements or layers may be present therebetween. When a component is "linked," "coupled," or "connected" to another component, the component can be directly linked or connected to the other component. However, unless specifically stated otherwise, it should be understood that a third component can be inserted between components that may be indirectly linked or connected.

[0027] Although the terms "first," "second," and the like are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components. Therefore, the first component mentioned below may be the second component in the technical concept of the present disclosure.

[0028] Like reference numerals generally refer to like elements throughout the specification.

[0029] The size and thickness of each component shown in the drawings are shown for convenience of explanation and are not limited to the size and thickness of the components shown in the embodiments of the present disclosure.

[0030] The features of the various embodiments of the present disclosure may be coupled or combined with each other in part or in whole, and may be technically interlocked and operated in various ways, and the respective embodiments may be performed independently or in association with each other.

[0031] In this specification, unless otherwise specifically stated, the modulus refers to a Young's modulus value measured by a tensile tester at room temperature (25° C.).

[0032] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0033] Figure 1 is an exploded view of a display device according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view of a display device according to an embodiment of the present disclosure.

[0034] Reference Figure 1 and Figure 2 The display panel DP refers to a panel for realizing an image. An organic light emitting element for realizing an image and circuits, lines, and components for operating the organic light emitting element may be provided on the display panel DP.

[0035] The display panel DP includes a display area AA, a non-display area NA, a folding area FA, and a non-folding area NFA.

[0036] The display area AA is an area for displaying images, and a plurality of pixels including organic light-emitting elements are arranged in the display area AA. The organic light-emitting elements for displaying images may be provided in the display area AA, and circuitry for operating the organic light-emitting elements may also be provided in the display area AA. In this disclosure, for ease of description, it is assumed that the display device is a display device 100 including a display panel DP having organic light-emitting elements. However, this disclosure is not limited thereto.

[0037] The circuit portion may include various thin film transistors, capacitors, circuits, etc. for operating the organic light emitting element. For example, the circuit portion may include various components such as a thin film driving transistor, a switching thin film transistor, a storage capacitor, a gate line, and a data line. However, the present disclosure is not limited thereto.

[0038] The non-display area NA is an area where no image is displayed. Circuits, lines, components, etc. for operating the organic light-emitting elements in the display area AA are provided in the non-display area NA. Various driver ICs such as gate driver ICs and data driver ICs and various drive circuits may be provided in the non-display area NA. For example, the various ICs and various drive circuits may be mounted in the non-display area NA of the display panel DP in a gate-in-panel (GIP) manner, or connected to the display panel DP in a tape carrier package (TCP) or chip-on-film (COF) manner.

[0039] Meanwhile, the display panel DP may also be defined as a display area AA and a non-display area NA or as a folding area FA and a non-folding area NFA.

[0040] The folding area (or folding portion or foldable area) FA is the area where the display panel DP is folded when the display device 100 is folded. The folding area FA may include a portion of the display area AA and a portion of the non-display area NA. In this disclosure, an example is described in which the folding area FA includes a portion of the display area AA and a portion of the non-display area NA. However, this disclosure is not limited to this. The non-display area NA may exist only in a portion of the area outside the display area AA. Therefore, the folding area FA may only include a portion of the display area AA.

[0041] The folding area FA can be folded along a specific radius of curvature around a folding axis. Specifically, the folding axis can be the Y-axis. When the folding area FA folds around the folding axis, the folding area FA can define a portion of a curve, a portion of a circle, or a portion of an ellipse. The radius of curvature of the folding area FA refers to the radius of the curve, circle, or ellipse corresponding to the portion of the curve, circle, or ellipse defined by the folding area FA. In the present disclosure, the following example is described: the folding axis is located in the Y-axis direction in the folding area FA, and the non-folding area NFA extends from the folding area FA in the X-axis direction and is perpendicular to the folding axis. However, the present disclosure is not limited to this.

[0042] The non-folding area (or non-folding portion or non-foldable area) NFA is an area where the display panel DP does not fold when the display device 100 is folded. In other words, the non-folding area NFA is an area where the display panel DP remains flat when the display device 100 is folded. The non-folding area NFA may include a portion of the display area AA and a portion of the non-display area NA.

[0043] The non-folding areas NFA may be areas located on opposite sides of the folding area FA. That is, the non-folding areas NFA may be areas extending in the Y-axis direction based on the folding axis. In this case, the folding area FA may be defined between the non-folding areas NFA. Therefore, when the display panel DP is folded about the folding axis, the non-folding areas NFA may face each other.

[0044] like Figure 1 As shown, the display device 100 may include a cover window CW, an optical layer OPL, a display panel DP, a back panel BP and / or a panel assembly PA. Figure 2 As shown, the display device 100 may further include a first joining member, a second joining member, and / or a third joining member.

[0045] The display panel (or image display member) DP includes a substrate. Since the substrate included in the display panel DP can be made of a flexible plastic material, the substrate is a foldable flexible substrate. In this case, for example, the process of manufacturing the display device 100 is performed while placing a panel manufacturing substrate made of glass on the lower portion of the substrate, a member such as a polarizing plate can be placed on the display panel DP, and then the panel manufacturing substrate can be released.

[0046] The back plate BP is located on the lower portion of the display panel DP. The back plate BP may be uniformly disposed in the entire area of ​​the lower portion of the display panel DP. In this case, the back plate BP is a substrate having rigidity to support the display panel DP and flexibility to ensure foldability. In this case, for example, the back plate BP may be made of a polymer material having excellent flexibility (e.g., polyamide, polyurethane, polymethyl methacrylate, polycarbonate, polyvinyl alcohol, acrylonitrile-butadiene-styrene, polyethylene terephthalate, silicone, polyimide, or polyamide-imide). The modulus of the back plate may be 1 MPa to 40 MPa. The thickness of the back plate may be 100 μm to 250 μm. However, the present disclosure is not limited thereto.

[0047] The second bonding member AD2 is located between the display panel DP and the back panel BP. The second bonding member AD2 can be uniformly provided over the entire area of ​​the top surface of the back panel BP and attach the display panel DP and the back panel BP. In this case, for example, the second bonding member AD2 can be made of a transparent bonding member such as an optically clear resin (OCR) or an optically clear adhesive (OCA). However, the present disclosure is not limited thereto.

[0048] The panel assembly PA can be located below the back panel BP. The panel assembly PA can be made of a rigid material and be located below the display panel DP. The panel assembly PA is used to support the display panel DP and support and maintain the shape of the display device 100 having the display panel DP. The panel assembly PA may include a panel top and a panel bottom. For example, the panel bottom may be made of a metal material (such as stainless steel or Invar) or a plastic material (such as polymethyl methacrylate, polycarbonate, polyvinyl alcohol, acrylonitrile-butadiene-styrene, polyethylene terephthalate, silicone or polyurethane). The panel top may be arranged between the back panel BP and the panel bottom and be made of a material with high rigidity to enhance the rigidity of the panel. The panel top may be made of a metal material (such as stainless steel, Invar, aluminum series or magnesium). As another example, the panel top may be made of a plastic material (such as polymethyl methacrylate, polycarbonate or polyurethane). The panel top and the panel bottom may be formed integrally, and the panel top or the panel bottom may be omitted if necessary.

[0049] The panel assembly PA has an opening pattern corresponding to the folding area FA of the display panel DP. The opening pattern may refer to a structure in which blocking portions (or blocking areas) and opening portions (or opening areas) are continuously and alternately arranged. Therefore, the opening pattern of the panel assembly PA may enable the panel assembly PA to be folded at the portion corresponding to the folding area FA of the display panel DP. The panel assembly PA may have a thickness greater than or equal to 0.18 mm and less than or equal to 0.22 mm. However, the present disclosure is not limited thereto.

[0050] The first bonding member AD1 may be located between the back plate BP and the panel assembly PA. The first bonding member AD1 may be uniformly disposed throughout the entire bottom surface of the back plate BP and attach the back plate BP and the panel assembly PA. The first bonding member AD1 may be made of the same material as the second bonding member AD2. However, the present disclosure is not limited thereto.

[0051] The optical layer OPL may be disposed on the display panel DP. The optical layer OPL may uniformly transmit light emitted from the display panel DP to the outside without reducing the brightness of the flexible display device 100, and absorb or reflect external light to improve display quality. For example, the optical layer OPL may be a polarizing plate. However, the present disclosure is not limited thereto.

[0052] The display panel DP and the optical layer OPL may be bonded by a third bonding member AD3. The third bonding member AD3 may include an optically clear adhesive (OCA) or a pressure sensitive adhesive (PSA). However, the present disclosure is not limited thereto.

[0053] The cover window CW is provided on the optical layer OPL. The cover window CW may be provided adjacent to a display surface on which an image is displayed. The cover window CW protects the display panel DP so that the display panel DP is not damaged or scratched by external impacts. The cover window CW may be made of thin glass or a film. The cover window CW may include a transparent substrate made of polyimide, polyamide-imide, or the like. The cover window CW may include one or more functional layers selected from the following: an anti-fingerprint layer, an anti-fouling layer, an anti-reflection layer, an anti-glare layer, a protective layer, and a hard coating layer including an acrylic resin, an epoxy resin, or a silicone resin. However, the present disclosure is not limited thereto.

[0054] The cover window CW and the optical layer OPL may be bonded by a fourth bonding member AD4. The fourth bonding member AD4 may include an optically clear adhesive (OCA) or a pressure sensitive adhesive (PSA). However, the present disclosure is not limited thereto.

[0055] Figure 3 This is a view used to illustrate the phenomenon of cellulite.

[0056] In the case of foldable display devices, the orange peel phenomenon may be caused by the bonding member. More specifically, when thin layers are stacked with the bonding member, the attached layers deform freely to achieve force balance, and the orange peel phenomenon slightly occurs during this process. However, when the bonding member is stacked on a rigid member such as the panel assembly PA, a restrictive force is generated that hinders the natural deformation of the surface attached to the rigid member. This restrictive force may exacerbate the orange peel phenomenon.

[0057] Reference Figure 3 , the first bonding member AD1 can be stacked on the upper part of the plate assembly PA. Because the plate assembly PA is a rigid member, the original surface shape of the first surface S1 is maintained. In other words, the original shape of the first surface S1 can be maintained regardless of the stacking of the first bonding member AD1. In contrast, the first bonding member AD1 can include a deformation pattern provided on a second surface S2 opposite to the first surface S1. The second surface S2 is the top surface of the first bonding member AD1, and the first surface S1 is the bottom surface of the first bonding member AD1.

[0058] Reference Figure 3 , the deformation pattern formed on the second surface S2 can cause upward deformation. For example, a deformation pattern can be formed on the third surface S3 by forming a deformation pattern on the second surface S2. The deformation pattern formed on the second surface S2 can transfer the deformation to the third surface S3. The deformation pattern formed on the bottom surface (for example, the first surface S1, the second surface S2, etc.) can transfer the deformation pattern to the top surface. Therefore, the deformation pattern can be transferred to the upper part of the display device, and the transfer of deformation can be regarded as an orange peel phenomenon. When the restrictive force transmitted as described above is low, the orange peel phenomenon can be reduced, as indicated by the reference line REF.

[0059] The present disclosure proposes a new design that reduces the degree of deformation of the deformation pattern transferred to the top surface of the bonding member when the bonding member (e.g., the first bonding member AD1) is stacked on a rigid material such as the board assembly PA. Hereinafter, display devices according to various embodiments of the present disclosure will be described.

[0060] Figure 4 is a partial cross-sectional view of a display device according to an embodiment of the present disclosure.

[0061] Reference Figure 4 The display device according to the embodiment may include a panel assembly PA, a first bonding member AD1 and / or a back panel BP. The display device according to the embodiment may further include a display panel DP and a cover window CW disposed above the back panel BP. In addition, the display device according to the embodiment may further include an optical layer OPL disposed between the display panel DP and the cover window CW. Figure 4 Description and reference of the board assembly PA, back panel BP, display panel DP, optical layer OPL and cover window CW Figure 1 and Figure 2 The description of the board assembly PA, the back panel BP, the display panel DP, the optical layer OPL, and the cover window CW of the display device is redundant. For the convenience of description, the repeated description will be omitted and the differences will be described.

[0062] Return to reference Figure 4 , the display device according to the embodiment includes a panel assembly PA and a back panel BP stacked on the panel assembly PA. The panel assembly PA and the back panel BP may be bonded by a first bonding member AD1.

[0063] The first bonding member AD1 may include a first surface S1 and a second surface S2, the first surface S1 may be the bottom surface of the first bonding member AD1, and the second surface S2 may be the top surface of the first bonding member AD1. The first surface S1 of the first bonding member AD1 is in contact with the panel assembly PA. The second surface S2 of the first bonding member AD1 is in contact with the backplate BP. In this specification, the first surface S1 may be referred to as the top surface of the panel assembly PA. In addition, in this specification, the second surface S2 may be referred to as the bottom surface of the backplate BP, which is not restrictive.

[0064] According to an embodiment of the present disclosure, the first bonding member AD1 may include multiple parts. For example, the first bonding member AD1 may include a first part AD1a configured to contact the panel assembly PA, a second part AD1b configured to contact the backplate BP, and a third part AD1c located between the first part AD1a and the second part AD1b. The first part AD1a, the second part AD1b, and the third part AD1c may be integral. The first part AD1a, the second part AD1b, and the third part AD1c may be made of substantially the same material.

[0065] The degree of deformation of the second surface S2 can be reduced by introducing a third portion AD1c between the first portion AD1a and the second portion AD1b. In detail, because the third portion AD1c is introduced, the overall thickness of the first joining member AD1 can be increased, and the restrictive force transmitted from the first surface S1 can be reduced. The restrictive force transmitted from the first surface S1 can be reduced by the third portion AD1c, so that the degree of deformation of the second surface S2 can be reduced. In other words, at the middle portion of the first joining member AD1, the restrictive force transmitted from the first surface S1 can be reduced, and the degree of deformation of the second surface S2 can be reduced. As described above, the thickness of the first joining member AD1 can be increased by introducing the third portion AD1c, so that the present disclosure can reduce the orange peel phenomenon of the display device.

[0066] Because of the introduction of the third portion AD1c, the thickness of the first bonding member AD1 can be greater than the thickness of each of the remaining bonding members. For example, the thickness of the first bonding member AD1 can be greater than the thickness of the second bonding member AD2. The thickness of the first bonding member AD1 can be greater than or equal to 50 μm, for example, 50 μm to 100 μm. When the thickness of the first bonding member AD1 is greater than or equal to 50 μm, the degree of orange peel effect can be improved by approximately 13%.

[0067] Figure 5 is a partial cross-sectional view of a display device according to an embodiment of the present disclosure.

[0068] Reference Figure 5 The display device according to the embodiment may include a panel assembly PA, a first bonding member AD1, a back panel BP, a second bonding member AD2 and / or a display panel DP. The display device according to the embodiment may further include a cover window CW. The display device according to the embodiment may further include an optical layer OPL disposed between the display panel DP and the cover window CW. Figure 5 Description and reference of the board assembly PA, back panel BP, display panel DP, optical layer OPL and cover window CW Figure 1 and Figure 2 The description of the board assembly PA, the back panel BP, the display panel DP, the optical layer OPL, and the cover window CW of the display device is redundant. For the convenience of description, the repeated description will be omitted and the differences will be described.

[0069] Return to reference Figure 5 , the display device according to the embodiment includes a panel assembly PA and a back panel BP stacked on the panel assembly PA. The panel assembly PA and the back panel BP may be bonded by a first bonding member AD1.

[0070] The first bonding member AD1 may include a first surface S1 and a second surface S2, the first surface S1 may be the bottom surface of the first bonding member AD1, and the second surface S2 may be the top surface of the first bonding member AD1. The first surface S1 of the first bonding member AD1 is in contact with the panel assembly PA. The second surface S2 of the first bonding member AD1 is in contact with the backplate BP. In this specification, the first surface S1 may be referred to as the top surface of the panel assembly PA. In addition, in this specification, the second surface S2 may be referred to as the bottom surface of the backplate BP, which is not restrictive.

[0071] The display device may further include a display panel DP disposed on the back panel BP. The display panel DP and the back panel BP may be bonded by a second bonding member AD2.

[0072] The second bonding member AD2 may include a third surface S3 and a fourth surface S4. The third surface S3 may be the bottom surface of the second bonding member AD2, and the fourth surface S4 may be the top surface of the second bonding member AD2. The third surface S3 of the second bonding member AD2 contacts the back plate BP. The fourth surface S4 of the second bonding member AD2 contacts the display panel DP. In this specification, the third surface S3 may be referred to as the top surface of the back plate. In addition, in this specification, the fourth surface S4 may be referred to as the bottom surface of the display panel DP, which is not restrictive.

[0073] According to an embodiment of the present disclosure, the second joining member AD2 may have a high modulus and / or a small thickness. For example, the second joining member AD2 may have a higher modulus than the first joining member AD1. For example, the second joining member AD2 may have a smaller thickness than the first joining member AD1. For example, the second joining member AD2 may have a modulus that is about 5 times or more of the modulus of the first joining member AD1. The second joining member AD2 may have a thickness less than or equal to 15 μm, in particular, 13 μm to 15 μm. The second joining member AD2 having the modulus and / or the thickness improves the degree of orange peel by about 20%.

[0074] According to the embodiments of the present disclosure, according to Figure 5 The first engaging member AD1 of the embodiment shown can be the same as that described above with reference to Figure 4 The first bonding member AD1 described is substantially the same. In other words, because the third portion AD1c is introduced, the first bonding member AD1 can be configured to be thicker than the other bonding members. The first bonding member AD1 can have a thickness greater than or equal to 50 μm (e.g., 50 μm to 100 μm). When the first bonding member AD1 has a thickness greater than or equal to 50 μm and the second bonding member AD2 is configured to have a thickness less than or equal to 15 μm and a high modulus, the degree of orange peel phenomenon is improved by about 34% compared to the related art.

[0075] Exemplary embodiments of the present disclosure may also be described as follows:

[0076] According to one aspect of the present disclosure, a display device is provided. The display device includes a display panel. The display device also includes a backplate disposed below the display panel. The display device also includes a board assembly disposed below the backplate. The backplate and the board assembly are coupled via a first bonding member, and the display panel and the backplate are coupled via a second bonding member, wherein the first bonding member is formed to be thicker than the second bonding member.

[0077] The thickness of the first bonding member may be greater than or equal to 50 μm and less than or equal to 100 μm.

[0078] The thickness of the second bonding member may be less than or equal to 15 μm.

[0079] The second joined member may have a higher modulus than the first joined member.

[0080] The first coupling member may be divided into a first portion, a second portion, and a third portion, the first portion contacts the plate assembly, the second portion contacts the back plate, and the third portion is disposed between the first portion and the second portion.

[0081] The first portion, the second portion and the third portion may be made of the same material.

[0082] The first engaging member may include a first surface and a second surface. The first surface may contact the plate assembly. The second surface may contact the back plate. The first engaging member may contact the plate assembly such that a restrictive force is transmitted from the first surface of the first engaging member to the second surface. The third portion may reduce the transmitted restrictive force.

[0083] The display panel may include an organic light emitting element.

[0084] The plate assembly may comprise a rigid material.

[0085] The display device may further include: an optical layer disposed above the display panel; and a cover window disposed above the optical layer. The cover window may include a film.

[0086] The standard deviation of the slope of the surface roughness of the cover window (slope stdev) may be less than or equal to 0.27 μm / mm, or greater than or equal to 0.22 μm / mm and less than or equal to 0.27 μm / mm.

[0087] Although the exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and can be implemented in many different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are provided for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Therefore, it should be understood that the above exemplary embodiments are illustrative in all aspects and do not limit the present disclosure. The scope of protection of the present disclosure should be interpreted based on the appended claims, and all technical concepts within their equivalent scope should be interpreted as falling within the scope of the present disclosure.

Claims

1. A display device comprising: Display panel; a back plate disposed below the display panel; as well as a plate assembly disposed below the back plate, The back plate and the panel assembly are coupled via a first coupling member, the display panel and the back plate are coupled via a second coupling member, and the first coupling member is formed to be thicker than the second coupling member.

2. The display device according to claim 1, wherein The thickness of the first bonding member is greater than or equal to 50 μm and less than or equal to 100 μm.

3. The display device according to claim 2, wherein: The second bonding member has a thickness of less than or equal to 15 μm.

4. The display device according to claim 1, wherein The second joining member has a higher modulus than the first joining member.

5. The display device according to claim 1, wherein The first joining member is divided into a first portion, a second portion, and a third portion, the first portion contacts the plate assembly, the second portion contacts the back plate, and the third portion is disposed between the first portion and the second portion. The display device according to claim 5 , wherein: The first portion, the second portion, and the third portion are made of the same material.

7. The display device according to claim 6, wherein: The first engaging member includes a first surface and a second surface, wherein the first surface is in contact with the plate assembly, wherein the second surface contacts the back plate, wherein the first engaging member contacts the plate assembly such that a restraining force is transferred from the first surface of the first engaging member to the second surface, and The third portion reduces the transmitted restrictive force.

8. The display device according to claim 1, wherein The display panel includes an organic light emitting element.

9. The display device according to claim 1, wherein The plate assembly comprises a rigid material.

10. The display device according to claim 1, further comprising: an optical layer disposed above the display panel; as well as a cover window disposed above the optical layer, Wherein, the cover window comprises a film.

11. The display device according to claim 10, wherein: The standard deviation of the slope of the surface roughness of the cover window is less than or equal to 0.27 μm / mm, or greater than or equal to 0.22 μm / mm and less than or equal to 0.27 μm / mm.

12. A display device comprising: Display panel; a back plate disposed below the display panel; as well as a plate assembly disposed below the back plate, wherein the back plate and the panel assembly are coupled via a first coupling member, the display panel and the back plate are coupled via a second coupling member, and The first and second joining members are provided to satisfy one or more of the following conditions: the first joining member is formed thicker than the second joining member; and the modulus of the first joining member is lower than the modulus of the second joining member.

13. The display device according to claim 12, wherein: The modulus of the second joining member is 5 times or more that of the first joining member.

14. The display device according to claim 12, wherein: The thickness of the first bonding member is greater than or equal to 50 μm and less than or equal to 100 μm.

15. The display device according to claim 14, wherein The second bonding member has a thickness of less than or equal to 15 μm.

Images