Display device

Abstract

The utility model relates to a display device. The display device includes: a display module including a folding area foldable based on a folding axis extending in a first direction, a first non-folding area, and a second non-folding area, in which the first non-folding area and the second non-folding area are spaced apart from each other in a second direction crossing the first direction; a window disposed on the display module; and an optical layer disposed between the display module and the window. The window includes: a base substrate including a pattern portion overlapping the folding region, and a first flat portion and a second flat portion overlapping the first non-folding region and the second non-folding region, respectively; and a protective layer disposed on the base substrate. The pattern portion includes a recessed region recessed in a direction from the protective layer toward the base substrate.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Korean Patent Application No. 10-2024-0027724 filed on February 27, 2024, as well as all derivative benefits thereto, the entire contents of which are incorporated herein by reference. BACKGROUND

[0003] The disclosure relates to a display device and a method for manufacturing a display device.

[0004] Various display devices for television sets, mobile phones, tablet computers, and game consoles are being developed. In recent years, flexible display devices including a slidable or foldable flexible display panel have been developed. Unlike rigid display devices, flexible display devices can be folded, rolled, or bent. Flexible display devices that vary in shape variously can be carried regardless of typical screen sizes, and thus user convenience can be improved. For a window included in a flexible display device, improved folding characteristics in a folding area of the window can be expected. SUMMARY

[0005] The disclosure provides a display device including a window having improved folding characteristics in a folding area.

[0006] The disclosure also provides a method for manufacturing a display device, the method for manufacturing a display device including a window manufactured at a reduced cost.

[0007] Embodiments supported by the disclosure provide a display device including a display module having a folding area foldable based on a folding axis extending in a first direction, a first non-folding area, and a second non-folding area, wherein the first non-folding area and the second non-folding area are spaced apart from each other in a second direction crossing the first direction; a window disposed on the display module; and an optical layer disposed between the display module and the window. The window includes a base substrate including a pattern portion overlapping the folding area, a first flat portion overlapping the first non-folding area, and a second flat portion overlapping the second non-folding area; and a protective layer disposed on the base substrate. The pattern portion includes a recessed region recessed in a direction from the protective layer toward the base substrate.

[0008] In embodiments, the pattern portion can have a minimum thickness of about 10 µm to about 40 µm, and each of the first flat portion and the second flat portion can have a thickness of about 50 µm to about 100 µm.

[0009] In an embodiment, the display device can further include a first adhesive layer disposed between the protective layer and the base substrate, and the first adhesive layer can fill in the recessed area of the pattern portion.

[0010] In an embodiment, the recessed area of the pattern portion can have a concave shape.

[0011] In an embodiment, the recessed area of the pattern portion can have a cross-sectional shape including a valley and a ridge connected to each other.

[0012] In an embodiment, the recessed area of the pattern portion can include a stepped portion that gradually descends in a direction from the first flat portion toward a center of the recessed area, and the recessed area of the pattern portion can include a stepped portion that gradually descends in a direction from the second flat portion toward the center of the recessed area.

[0013] In an embodiment, the display device can further include a second adhesive layer disposed between the optical layer and the base substrate.

[0014] In an embodiment, the base substrate can include a transparent film disposed on the second adhesive layer and a coating layer disposed on the transparent film.

[0015] In an embodiment, the base substrate can include a thin film glass substrate disposed on the second adhesive layer.

[0016] In an embodiment, the base substrate can include a coating layer disposed on the thin film glass substrate. In an embodiment, the base substrate can directly contact the optical layer.

[0017] In an embodiment, the display device can further include a lower film disposed below the display module, a support plate disposed below the lower film, and a lower plate disposed below the support plate.

[0018] In an embodiment, the lower plate can include a hole overlapping the folding area and passing through the lower plate. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the present inventive concept and are incorporated in and constitute a part of this specification, illustrate embodiments of the present inventive concept and together with the description serve to explain the inventive concept. In the drawings:

[0020] Figure 1A is a perspective view illustrating a display device according to an embodiment;

[0021] Figure 1B is a perspective view illustrating a display device according to an embodiment;

[0022] Figure 1C is a perspective view showing a display device according to an embodiment;

[0023] Figure 1D is a perspective view showing a display device according to an embodiment;

[0024] Figure 2A is a perspective view showing a display device according to an embodiment;

[0025] Figure 2B is a perspective view showing a display device according to an embodiment;

[0026] Figure 2C is a perspective view showing a display device according to an embodiment;

[0027] Figure 3 is an exploded perspective view showing a display device according to an embodiment;

[0028] Figure 4 is a cross-sectional view taken along line I-I' of Figure 3

[0029] Figure 5 is a plan view showing a display panel according to an embodiment;

[0030] Figures 6-11 is a cross-sectional view showing a display device according to an embodiment supported by the present disclosure;

[0031] Figure 12A and Figure 12B are cross-sectional views showing a method for manufacturing a display device according to an embodiment supported by the present disclosure; and

[0032] Figure 13A and Figure 13B are cross-sectional views showing a method for manufacturing a display device according to an embodiment supported by the present disclosure. DETAILED DESCRIPTION

[0033] In this specification, it will be understood that when an element (or a region, layer, part, etc.) is referred to as being "on", "connected to" or "coupled to" another element (or a region, layer, part, etc.), it can be directly present on, connected or coupled to the other element (or a region, layer, part, etc.), or there can be intervening third elements (or regions, layers, parts, etc.) present.

[0034] The same reference denotations will be used throughout the drawings and the specification and refer to the same or like components. In some aspects, in the drawings, the thickness, proportions and dimensions of components can be exaggerated for clarity. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] ​It will be understood that, although the terms such as first and second are used herein to describe various elements, these elements should not be limited by these terms. The terms are used to distinguish one component from another. For example, an element referred to as a first element in an embodiment can be referred to as a second element in another embodiment, without departing from the scope of the appended claims. Singular forms of terms can include plural forms unless otherwise specified.

[0036] For ease of description, spatially relative terms such as "below", "lower", "above", and "upper" can be used herein for the purpose of describing the relationship between elements and / or features as illustrated in the figures. The terms can be relative concepts and described based on the direction exhibited in the figures.

[0037] The meaning of "include" or "comprise" indicates the presence of properties, fixed numbers, steps, operations, elements, components, or combinations thereof, but does not exclude the presence or addition of other properties, fixed numbers, steps, operations, elements, components, or combinations thereof.

[0038] "About" or "approximately", as used herein, in respect of a measurement or measurements discussed, includes the stated value and also a reasonable range of deviation as would be appreciated by a person of ordinary skill in the art. For example, the term "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0039] The term "substantially", as used herein, means approximately or virtually. The term "substantially equal" means approximately equal or virtually equal. The term "substantially the same" means approximately the same or virtually the same. The term "substantially perpendicular" means approximately perpendicular or virtually perpendicular. The term "substantially parallel" means approximately parallel or virtually parallel.

[0040] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. Terms, as defined in a general dictionary, should be interpreted as having the same meaning as they are commonly used in the relevant technical field, and unless explicitly defined in the description, the terms are not idealized or interpreted as having formal meanings.

[0041] Hereinafter, embodiments of the present inventive concept supported by aspects of the present disclosure will be described with reference to the accompanying drawings.

[0042] Figure 1A is a perspective view showing a display device according to an embodiment. Figure 1Bis a perspective view showing a display device according to an embodiment. Figure 1C is a perspective view showing a display device according to an embodiment. Figure 1D is a perspective view showing a display device according to an embodiment.

[0043] Figure 1A is a perspective view showing an unfolded state of a display device ED according to an embodiment. The display device ED according to an embodiment can be activated by an electric signal. Although the display device ED can be, for example, a mobile phone, a tablet computer, a navigation unit for a car, a game machine, or a wearable device, embodiments of the present disclosure are not limited thereto. Figures 1A-2C Foldable display devices ED and ED-a are shown as examples. Each of the foldable display devices ED and ED-a according to an embodiment can be a mobile phone.

[0044] The display device ED can include a first display surface FS defined by a first directional axis DR1 and a second directional axis DR2 intersecting the first directional axis DR1. The display device ED can provide an image IM to a user through the first display surface FS. The display device ED can display the image IM on the first display surface FS in a direction of a third directional axis DR3 parallel to each of the first directional axis DR1 and the second directional axis DR2.

[0045] In the present specification, the first directional axis DR1 and the second directional axis DR2 can be perpendicular to each other, and the third directional axis DR3 is a normal direction with respect to a plane defined by the first directional axis DR1 and the second directional axis DR2. A thickness direction of the display device ED can be parallel to the third directional axis DR3. A front (or top) surface and a rear (or bottom) surface can be opposite to each other in the third directional axis DR3, and a normal direction of each of the front (or top) surface and the rear (or bottom) surface can be parallel to the third directional axis DR3. The front (or top) surface denotes a surface adjacent to the first display surface FS, and the rear (or bottom) surface denotes a surface spaced apart from the first display surface FS. In some aspects, the rear (bottom) surface denotes a surface adjacent to a second display surface RS to be described later. An upper side (or upper portion) denotes a direction toward the first display surface FS, and a lower side (or lower portion) denotes a direction away from the first display surface FS.

[0046] A cross section of each of the components denotes a plane parallel to the third directional axis DR3 as a thickness direction, and the plane denotes a surface perpendicular to the third directional axis DR3 as a thickness direction. The plane denotes a surface defined by the first directional axis DR1 and the second directional axis DR2.

[0047] In the present specification, the directions indicated by the first direction axis DR1, the second direction axis DR2, and the third direction axis DR3 can be relative concepts and converted with respect to each other. In some aspects, the directions indicated by the first direction axis DR1, the second direction axis DR2, and the third direction axis DR3 can be described as the first direction DR1, the second direction DR2, and the third direction DR3, and denoted by the same reference numerals.

[0048] The display device ED can sense an external input applied from the outside. The external input can include various types of input provided from the outside of the display device ED. For example, the external input can include contact generated by a part of the user's body, such as taking the user's hand as an example, and an external input applied by being disposed adjacent to or at a predetermined distance from the display device ED (for example, hovering). In some aspects, the external input can be various types, such as taking force (for example, pressure), temperature, and light as examples.

[0049] The display device ED can include a first display surface FS and a second display surface RS. The first display surface FS can include a first active area F-AA, a first non-active area F-NAA, and an electronic module area EMA. The second display surface RS can be defined as a surface opposite at least a portion of the first display surface FS. That is, the second display surface RS can be defined as a portion of the rear surface of the display device ED.

[0050] The first active area F-AA can be activated by an electrical signal. The first active area F-AA can be an area in which an image IM is displayed and an external input is sensed.

[0051] The first non-active area F-NAA can be an area in which an image IM is not displayed. The first non-active area F-NAA can be disposed adjacent to the first active area F-AA. The first non-active area F-NAA can have a predetermined color. The first non-active area F-NAA can surround the first active area F-AA. Accordingly, the first active area F-AA can substantially have a planar shape defined by the first non-active area F-NAA. However, this is merely illustrative. For example, the first non-active area F-NAA can be disposed adjacent to a single side of the first active area F-AA, or the first non-active area F-NAA can be omitted.

[0052] Various electronic modules can be disposed in the electronic module area EMA. For example, the electronic modules can include at least one of a camera, a speaker, an optical detection sensor, and a thermal detection sensor. The electronic module area EMA can sense an external object received through the display surface FS and RS, or provide a sound signal (such as a voice, for example) to the outside through the display surface FS and RS. The electronic modules can include a plurality of components. However, embodiments supported by the present disclosure are not limited to the components of the electronic modules described.

[0053] The electronic module area EMA can be surrounded by the first non-active area F-NAA. However, this is merely illustrative, and embodiments supported by the present disclosure are not limited to the electronic module area EMA. For example, the electronic module area EMA can be surrounded by the first active area F-AA and the first non-active area F-NAA, and the electronic module area EMA can be disposed in the first active area F-AA.

[0054] The display device ED according to an embodiment can include at least one folding area FA and a plurality of non-folding areas NFA1 and NFA2 each extending from the folding area FA. For example, the first non-folding area NFA1, the folding area FA, and the second non-folding area NFA2 can be sequentially defined in the second direction DR2. The display device ED can be divided in the second direction DR2 into the first non-folding area NFA1 and the second non-folding area NFA2 spaced apart from each other with the folding area FA therebetween. For example, the first non-folding area NFA1 can be disposed at one side of the folding area FA in the second direction DR2, and the second non-folding area NFA2 can be disposed at the other side of the folding area FA in the second direction DR2.

[0055] Although Figure 1A Embodiments of the display device ED including one folding area FA are illustrated in FIGS. 1A to 1C, embodiments of the present disclosure are not limited thereto. For example, a plurality of folding areas can be defined in the display device ED. For example, the display device according to an embodiment can include two or more folding areas and three or more non-folding areas disposed between the folding areas.

[0056] Figure 1B FIG. 2 is a perspective view illustrating an inner folding operation of the display device ED according to an embodiment. Figure 1C FIG. 3 is a perspective view illustrating an inner folded state of the display device ED according to an embodiment. Figure 1D FIG. 4 is a perspective view illustrating an outer folding operation of the display device ED according to an embodiment.

[0057] Reference will now be made to Figure 1B, the display device ED according to an embodiment can be folded based on a first folding axis FX1 extending in the first direction DR1. In the folded state of the display device ED, the folding area FA can have a predetermined curvature and a predetermined radius of curvature. The display device ED can be folded and deformed into an inner folding state based on the first folding axis FX1 such that the first non-folding area NFA1 and the second non-folding area NFA2 face each other and the first display surface FS is not exposed to the outside.

[0058] Referring to Figure 1C , in a state in which the display device ED according to an embodiment is inner folded, the second display surface RS can be recognized by a user. Here, the second display surface RS can include a second active area R-AA. The second active area R-AA can be activated by an electrical signal. The second active area F-AA can be an area in which an image IM is displayed and various types of external inputs are sensed.

[0059] In some aspects, the second display surface RS can include a second peripheral area R-NAA. The second peripheral area R-NAA can be disposed adjacent to the second active area R-AA. The second peripheral area R-NAA can have a predetermined color. The second peripheral area R-NAA can surround the second active area R-AA. Although not shown, the display device ED can further include an electronic module area in which an electronic module including various components is disposed on the second display surface RS. However, embodiments of the disclosure are not limited thereto.

[0060] According to an embodiment, in the inner folded state of the display device ED, a distance between the first non-folding area NFA1 and the second non-folding area NFA2 can be less than a radius of a circle defined by a radius of curvature of the folding area FA. Here, the folding area FA can be folded into a dumbbell shape, and the distance between the first non-folding area NFA1 and the second non-folding area NFA2 can be reduced. Accordingly, a display device ED that is slim in the folded state can be provided.

[0061] Referring to Figure 1D , the display device ED according to an embodiment can be folded based on a second folding axis FX2 extending in the first direction DR1. The display device ED can be folded and deformed into an outer folding state based on the second folding axis FX2 such that the first display surface FS is exposed to the outside. In an embodiment, the display device ED can alternately perform an inner folding operation and an outer folding operation from an unfolding operation in a repeated manner. However, embodiments of the disclosure are not limited thereto.

[0062] Although Figures 1A-1DThe display device ED will be folded based on one folding axis FX1 or FX2 as an example, but embodiments supported by the disclosure are not limited to the number of folding axes and the number of non-folding areas corresponding thereto. For example, the display device ED can be folded based on a plurality of folding axes such that the first display surface FS and the second display surface RS partially face each other. Although the first folding axis FX1 and the second folding axis FX2 are parallel to the long side of the display device ED in the drawings, embodiments of the disclosure are not limited thereto. For example, the first folding axis FX1 and the second folding axis FX2 can be parallel to the short side of the display device ED.

[0063] In the display device ED, as shown in Figure 1C , a first non-folding area NFA1 (see Figure 1A ) and a second non-folding area NFA2 (see Figure 1A ) can be defined as an area having the display surface FS (see Figure 1A ) or RS parallel to a plane defined by the first direction axis DR1 and the second direction axis DR2 in the folded state, and a folding area FA (see Figure 1A ) can be an area between the first non-folding area NFA1 and the second non-folding area NFA2. The folding area FA can include a curved portion bent to have a predetermined curvature in the folded state.

[0064] Figure 2A is a perspective view illustrating a display device according to an embodiment. Figure 2B is a perspective view illustrating a display device according to an embodiment. Figure 2C is a perspective view illustrating a display device according to an embodiment.

[0065] Figures 2A-2C is a perspective view illustrating a display device ED-a according to another embodiment supported by the disclosure. Figure 2A is a perspective view illustrating an unfolded state of the display device ED-a. Figure 2B and Figure 2C are perspective views illustrating a folding operation of the display device ED-a. Figure 2B is a perspective view illustrating Figure 2A an inner folding operation of the display device ED-a shown in Figure 2C is a perspective view illustrating Figure 2A an outer folding operation of the display device ED-a shown in Figure 2A is a view illustrating the display device ED-a in a second mode.

[0066] Referring to Figure 2A , the display device ED-a can be folded based on a third folding axis FX3 extending in a first direction DR1. The extension direction of the third folding axis FX3 can be parallel to the extension direction of the short side of the display device ED-a.

[0067] The display device ED-a can be divided into a folding area FA-a, a first non-folding area NFA1-a adjacent to one side of the folding area FA-a, and a second non-folding area NFA2-a adjacent to the other side of the folding area FA-a. The first non-folding area NFA1-a and the second non-folding area NFA2-a can be spaced apart from each other with the folding area FA-a therebetween.

[0068] The folding area FA-a can be an area folded based on the third folding axis FX3. In the folded state of the display device ED-a, the folding area FA-a can have a predetermined curvature and a predetermined radius of curvature. The display device ED-a can be folded inwardly such that the first non-folding area NFA1-a and the second non-folding area NFA2-a can face each other and the display surface FS-a is not exposed to the outside.

[0069] Referring to Figure 2A , in the unfolded state (i.e., the unfolded state) of the display device ED-a according to an embodiment, the display surface FS-a can be recognized by a user. As described with reference to Figures 1A-1D , the display surface FS-a of the display device ED-a can include an active area F-AAa and a peripheral area F-NAAa. The active area F-AAa can be an area in which an image IM is displayed and various types of external inputs are sensed.

[0070] Referring to Figure 2B , in the inwardly folded state of the display device ED-a according to an embodiment, the rear surface RS-a can be recognized by a user. For example, the rear surface RS-a can serve as a second display surface in which a video or an image is displayed. In some aspects, an electronic module area in which an electronic module including various components is disposed can also be disposed on the rear surface RS-a. According to an embodiment, the rear surface RS-a of the display device ED-a can also include an active area in which an image is displayed.

[0071] Referring to Figure 2C , the display device ED-a can be folded based on the third folding axis FX3 and deformed into an outwardly folded state in which one area of the rear surface RS-a overlapping the first non-folding area NFA1-a faces the other area overlapping the second non-folding area NFA2-a.

[0072] Figure 3 is an exploded perspective view illustrating a display device according to an embodiment. Figure 4 is a cross-sectional view taken along line I-I' of Figure 3 . Figure 5is a plan view showing a display panel according to an embodiment. Hereinafter, features to be described in the display device ED can be applied to the display device ED-a described in Figures 2A-2C

[0073] Referring to Figure 3 , the display device ED can include a window WL, an optical layer RPL, a display module DM, a lower film PM, a support plate SP, a lower plate MP, and a housing HAU.

[0074] The housing HAU can be coupled with the window WL to define an outer appearance of the display device ED. The housing HAU can include a material having a relatively high rigidity. For example, the housing HAU can include a plurality of frames and / or support plates formed of glass, plastic, or metal. The housing HAU can provide a predetermined accommodation space. The display module DM can be accommodated in the accommodation space and be protected from external impact. According to an embodiment, the housing HAU overlapping the folding area FA can further include a hinge structure for guiding a folding operation of the display device ED.

[0075] The display module DM can be disposed under the optical layer RPL. The display module DM can be activated by an electrical signal. When the display module DM is activated, an image IM (refer to Figure 1A ) can be displayed in an active area F-AA (refer to Figure 1A ) of the display device ED. A display area DM-AA and a non-display area DM-NAA can be defined in the display module DM. The display area DM-AA can be activated by an electrical signal. The non-display area DM-NAA can be disposed adjacent to at least one side of the display area DM-AA. A circuit or a line for driving the display area DM-AA can be disposed in the non-display area DM-NAA.

[0076] The optical layer RPL can be disposed between the display module DM and the window WL. The optical layer RPL can be an anti-reflection layer that reduces reflectance of external light incident from the outside of the display module DM. The optical layer RPL can be disposed on the display module DM through a continuous process. The optical layer RPL can include a polarizing plate or a color filter layer. For example, the optical layer RPL can include at least one of a phase retarder, a polarizer, a polarizing film, and a polarization filter. Alternatively, the optical layer RPL can include a plurality of color filters arranged in a predetermined arrangement and a black matrix disposed adjacent to the color filters.

[0077] The image IM (refer to Figure 1A ) generated in the display module DM can be provided to a user through the window WL. The window WL can include a polymer substrate or a glass substrate.

[0078] ​The window WL according to an embodiment can include a protective layer PF and a base substrate VL. Each of the protective layer PF and the base substrate VL can include an optically transparent insulating material.

[0079] The protective layer PF can be disposed on the base substrate VL. The protective layer PF can be a functional layer that protects a top surface of the base substrate VL. The protective layer PF can include a polymer film. The protective layer PF can include an anti-fingerprint coating agent, a hard coating agent, and an anti-static agent.

[0080] The lower film PM can protect a lower portion of the display panel DP. The lower film PM can include a flexible plastic material. For example, the lower film PM can include polyethylene terephthalate.

[0081] The support plate SP can be disposed below the display panel DP, for example, below the lower film PM. A portion of the support plate SP according to an embodiment supported by the present disclosure can be bent to absorb an impact applied between components disposed on the support plate SP and the housing HAU. In some aspects, the support plate SP can prevent foreign substances from being introduced into components disposed on the support plate SP.

[0082] The lower plate MP can be disposed below the support plate SP. The lower plate MP can include a plurality of holes HL overlapping the folding area FA and passing through the lower plate MP to allow easy performance of a folding operation of the display device ED. The lower plate MP can include a metal. For example, the lower plate MP can include at least one of aluminum (Al) and molybdenum (Mo). However, embodiments of the present disclosure are not limited thereto. For example, the lower plate MP can include a matrix including a filler and a woven fiber line disposed in the matrix. The fiber line can be arranged in the matrix in the form of a fabric.

[0083] The fiber line can include a reinforced fiber composite. The reinforced fiber composite can be one of carbon fiber reinforced plastic (CFRP) and glass fiber reinforced plastic (GFRP). A strand of fibers included in one fiber line can have a diameter of 3 µm or more and 10 µm or less.

[0084] The matrix according to an embodiment can include at least one of an epoxy resin, a polyester, a polyamide, a polycarbonate, a polypropylene, a polybutylene, and a vinyl ester.

[0085] The matrix can include a filler. The filler can include at least one of barium sulfate, sintered talc, barium titanate, titanium oxide, clay, alumina, mica, zeolite, zinc borate, and zinc stannate.

[0086] The display device ED according to the embodiment can further include at least one of a buffer layer and a shielding layer. The buffer layer can prevent a compression phenomenon and plastic deformation of the lower plate MP caused by external impact and force. The buffer layer can include an elastomer such as, for example, a sponge, a foam, or a urethane resin. In some aspects, the buffer layer can include at least one of an acrylic polymer, a urethane polymer, a silicon polymer, and an imine polymer. The shielding layer can be an electromagnetic wave shielding layer or a heat dissipation layer.

[0087] The display device ED according to the embodiment can further include first to sixth adhesive layers AD1 to AD6. The first adhesive layer AD1 can be disposed between the base substrate VL and the protection layer PF. The second adhesive layer AD2 can be disposed between the optical layer RPL and the base substrate VL. The third adhesive layer AD3 can be disposed between the display module DM and the optical layer RPL. The fourth adhesive layer AD4 can be disposed between the lower film PM and the display module DM. The fifth adhesive layer AD5 can be disposed between the support plate SP and the lower film PM. The sixth adhesive layer AD6 can be disposed between the lower plate MP and the support plate SP.

[0088] Each of the first to sixth adhesive layers AD1 to AD6 and the adhesive layer to be described later can include a typical adhesive such as, for example, a pressure sensitive adhesive (PSA), an optically clear adhesive (OCA), and an optically clear resin (OCR). However, embodiments of the present disclosure are not limited thereto. According to the embodiment, at least one of the first to sixth adhesive layers AD1 to AD6 can be omitted from the display device ED according to the embodiment.

[0089] Referring to Figure 4 The display module DM can include a display panel DP and an input sensing layer ISP disposed on the display panel DP. The display panel DP can be a component that substantially generates an image. The display panel DP can be a light emitting display panel. For example, the display panel DP can be an organic light emitting display panel, an inorganic light emitting display panel, a micro light emitting diode (LED) display panel, a micro organic light emitting diode (OLED) display panel, or a nano LED display panel.

[0090] The display panel DP can include a base layer BS, a circuit layer DP-CL, a display element layer DP-EL, and a packaging layer TFE, which are sequentially stacked with each other. Unlike as shown, a functional layer can be further disposed between two adjacent ones of the base layer BS, the circuit layer DP-CL, the display element layer DP-EL, and the packaging layer TFE.

[0091] The base layer BS can provide a base surface on which the circuit layer DP-CL is disposed. The base layer BS can be a flexible board that is bendable, foldable, or rollable. The base layer BS can include a glass substrate, a metal substrate, or a polymer substrate. However, embodiments of the present disclosure are not limited thereto. For example, the base layer BS can be an inorganic layer, an organic layer, or a composite layer.

[0092] The base layer BS can include a single layer or multiple layers. For example, the base layer BS can include a first synthetic resin layer, a single inorganic layer or a multiple inorganic layer, and a second synthetic resin layer disposed on the single inorganic layer or the multiple inorganic layer. Each of the first synthetic resin layer and the second synthetic resin layer can include a polyimide-based resin. In some aspects, each of the first synthetic resin layer and the second synthetic resin layer can include at least one of an acrylic-based resin (e.g., a methacrylic-based resin), a polyisoprene-based resin, an ethylene-based resin, an epoxy-based resin, a urethane-based resin, a cellulose-based resin, a siloxane-based resin, a polyamide-based resin, and a perylene-based resin. In the present specification, the term "~ -based resin" indicates that it includes a "~ -based" functional group.

[0093] The circuit layer DP-CL can be disposed on the base layer BS. The circuit layer DP-CL can include an insulating layer, a semiconductor pattern, a conductive pattern, and a signal line. The display element layer DP-EL can be disposed on the circuit layer DP-CL. The display element layer DP-EL can include a light emitting element (not shown). For example, the light emitting element can include an organic light emitting material, an inorganic light emitting material, an organic-inorganic light emitting material, a quantum dot, a quantum rod, a micro-LED, or a nano-LED.

[0094] The encapsulation layer TFE can be disposed on the display element layer DP-EL. The encapsulation layer TFE can protect the display element layer DP-EL from moisture, oxygen, and foreign substances such as, for example, dust particles. The encapsulation layer TFE can include at least one inorganic layer. For example, the encapsulation layer TFE can include an inorganic layer, an organic layer, and an inorganic layer that are sequentially stacked with each other.

[0095] The input sensing layer ISP can be disposed on the display panel DP. The input sensing layer ISP can be directly disposed on the encapsulation layer TFE. Alternatively, an adhesive member can be disposed between the input sensing layer ISP and the display panel DP.

[0096] In the present specification, a feature in which one of the components is directly disposed on another component indicates that a third component is not disposed between the one component and the other component. That is, a feature in which one of the components is "directly disposed" on another component indicates that the one component "contacts" the other component.

[0097] The input sensing layer ISP can sense an external input, convert the external input into an input signal, and provide the input signal to the display panel DP. For example, the input sensing layer ISP can be a touch sensing layer that senses a touch. The input sensing layer ISP can identify a direct touch of a user, an indirect touch of a user, a direct touch of an object, or an indirect touch of an object.

[0098] The input sensing layer ISP can sense at least one of a position and intensity (pressure) of a touch applied from the outside. The input sensing layer ISP can have various structures or be formed of various materials. However, embodiments of the present disclosure are not limited thereto. For example, the input sensing layer ISP can sense an external input in a capacitive manner. The display panel DP can receive an input signal from the input sensing layer ISP and generate an image corresponding to the input signal.

[0099] Referring to Figure 5 , the display panel DP can include pixels PX, a scan driver SDV, a data driver DDV, and an emission driver EDV.

[0100] The display panel DP can include a first area AA1, a second area AA2, and a bending area BA disposed between the first area AA1 and the second area AA2. The bending area BA can extend in a first direction DR1, and the first area AA1, the bending area BA, and the second area AA2 can be arranged in a second direction DR2. The bending area BA can be bent so that the second area AA2 overlaps a bottom surface of the first area AA1 along a bending axis extending in the first direction DR1. According to an embodiment, a width of each of the bending area BA and the second area AA2 in the first direction DR1 can be less than a width of the first area AA1 in the first direction DR1. Accordingly, the bending area BA can be easily bent toward the bottom surface of the first area AA1.

[0101] The first area AA1 can include a display area DA and a non-display area NDA disposed around the display area DA. The non-display area NDA can surround the display area DA. The display area DA can display an image, and the non-display area NDA can not display an image. Each of the second area AA2 and the bending area BA can not display an image.

[0102] The first area AA1 can include first and second non-folded areas NFA1 and NFA2 arranged in the second direction DR2, and a folded area FA disposed between the first and second non-folded areas NFA1 and NFA2. The first and second non-folded areas NFA1 and NFA2 and the folded area FA can correspond to the first and second non-folded areas NFA1 and NFA2 and the folded area FA of the display device ED shown in FIG. 1A. Figure 1A The first and second non-folded areas NFA1 and NFA2 and the folded area FA of the display device ED shown in FIG. 1A.

[0103] The first area AA1 can be bent and folded based on the folding axis described above. For example, when the folding area FA of the first area AA1 is folded based on the folding axis described above, the display panel DP can be folded.

[0104] The display panel DP can include a plurality of pixels PX, a plurality of scan lines SL1 to SLm, a plurality of data lines DL1 to DLn, a plurality of emission lines EL1 to ELm, a first control line CSL1 and a second control line CSL2, a power line PL, a plurality of connection lines CNL, and a plurality of pads PD. Here, m and n are natural numbers greater than 0. The pixels PX can be disposed in the display area DA and connected to the scan lines SL1 to SLm, the data lines DL1 to DLn, and the emission lines EL1 to ELm.

[0105] The scan driver SDV and the emission driver EDV can be disposed in the non-display area NDA. Each of the scan driver SDV and the emission driver EDV can be disposed in the non-display area NDA, the scan driver SDV and the emission driver EDV being disposed adjacent to both sides of the first area AA1 opposite each other in the second direction DR2, respectively. The data driver DDV can be disposed in the second area AA2. The data driver DDV can be manufactured in the form of an integrated circuit chip and mounted in the second area AA2.

[0106] The plurality of scan lines SL1 to SLm can each extend in the first direction DR1 and be connected to the scan driver SDV. The plurality of data lines DL1 to DLn can each extend in the second direction DR2 and be connected to the data driver DDV through the bending area BA. The data driver DDV can be connected to the pixels PX through the data lines DL1 to DLn. The plurality of emission lines EL1 to ELm can each extend in the first direction DR1 and be connected to the emission driver EDV.

[0107] The power line PL can extend in the second direction DR2 and be disposed in the non-display area NDA. The power line PL can be disposed between the display area DA and the emission driver EDV. The power line PL can extend to the second area AA2 through the bending area BA. In a plan view, the power line PL can extend toward a lower end of the second area AA2. The power line PL can receive a driving voltage.

[0108] The plurality of connection lines CNL can each extend in the first direction DR1, and the plurality of connection lines CNL can be arranged in the second direction DR2. The connection lines CNL can be connected to the power line PL and the pixels PX. The driving voltage can be applied to the pixels PX through the power line PL and the connection lines CNL connected to each other.

[0109] The first control line CSL1 can be connected to the scan driver SDV and extend toward the lower end of the second area AA2 through the bending area BA. The second control line CSL2 can be connected to the emission driver EDV and extend toward the lower end of the second area AA2 through the bending area BA. The data driver DDV can be disposed between the first control line CSL1 and the second control line CSL2.

[0110] The pad PD can be disposed adjacent to the lower end of the second area AA2 in a plan view. The data driver DDV, the power line PL, the first control line CSL1, and the second control line CSL2 can be connected to the pad PD.

[0111] The data lines DL1 to DLn can be connected to the corresponding pads PD through the data driver DDV. For example, the data lines DL1 to DLn can be connected to the data driver DDV, and the data driver DDV can be connected to a plurality of pads PD corresponding to the data lines DL1 to DLn, respectively.

[0112] Although not shown, a printed circuit board can be connected to the pad PD, and a timing controller and a voltage generator can be disposed on the printed circuit board. The timing controller can be manufactured in the form of an integrated circuit chip and mounted to the printed circuit board. The timing controller and the voltage generator can be connected to the pad PD through the printed circuit board.

[0113] The timing controller can control the operation of each of the scan driver SDV, the data driver DDV, and the emission driver EDV. The timing controller can generate a scan control signal, a data control signal, and an emission control signal in response to a control signal received from the outside. The voltage generator can generate a driving voltage.

[0114] The scan control signal can be provided to the scan driver SDV through the first control line CSL1. The emission control signal can be provided to the emission driver EDV through the second control line CSL2. The data control signal can be provided to the data driver DDV. The timing controller can receive an image signal from the outside and convert a data format of the image signal to match an interface specification of the data driver DDV, thereby providing the converted image signal to the data driver DDV.

[0115] The scan driver SDV can generate a plurality of scan signals in response to the scan control signal. The scan signals can be applied to the pixels PX through the scan lines SL1 to SLm. The scan signals can be sequentially applied to the pixels PX.

[0116] The data driver DDV can generate a plurality of data voltages corresponding to the image signal in response to a data control signal. The data voltages can be applied to the pixels PX through data lines DL1 to DLn. The emission driver EDV can generate a plurality of emission signals in response to an emission control signal. The emission signals can be applied to the pixels PX through emission lines EL1 to ELm.

[0117] The pixels PX can receive the data voltages in response to the scan signals. The pixels PX can display the image by emitting light having luminance corresponding to the data voltages in response to the emission signals. The pixels PX can have an emission time controlled by the emission signals. Each of the pixels PX can include a transistor, a capacitor, and a light emitting element connected to the transistor and the capacitor. Each of the transistors can include a semiconductor pattern. The semiconductor pattern can include polysilicon, amorphous silicon, or metal oxide. The semiconductor pattern can be doped with an n-type dopant or a p-type dopant. The semiconductor pattern can include a highly doped region and a lightly doped region. The highly doped region can have a higher electrical conductivity than that of the lightly doped region and substantially function as a source electrode and a drain electrode of the transistor. The lightly doped region can substantially correspond to an active part (or a channel) of the transistor.

[0118] Figures 6-11 is a cross-sectional view illustrating a display apparatus according to an embodiment supported by the disclosure. Figures 6-11 The windows WL, WL-1, WL-2, WL-3, WL-4, and WL-5 among the components included in the display apparatuses ED, ED-1, ED-2, ED-3, ED-4, and ED-5 and the optical layers RPL disposed under the windows WL, WL-1, WL-2, WL-3, WL-4, and WL-5 are illustrated, and other components described in Figure 3 may be omitted. In some aspects, Figures 6-11 The windows WL, WL-1, WL-2, WL-3, WL-4, and WL-5 described in Figures 1A-2C may be applied to the display apparatuses ED and ED-a in

[0119] Referring to Figure 6 , the display apparatus ED according to an embodiment can include a window WL and an optical layer RPL disposed under the window WL. The window WL and the optical layer RPL can be bonded to each other by a second adhesive layer AD2.

[0120] The window WL according to an embodiment can include a protective layer PF and a bulk substrate VL. The protective layer PF and the bulk substrate VL can be bonded to each other by a first adhesive layer AD1. According to an embodiment, a top surface of the bulk substrate VL can contact the first adhesive layer AD1, and a bottom surface of the bulk substrate VL can contact the second adhesive layer AD2.

[0121] The base substrate VL can include a first flat portion HW1 overlapping the first non-folded area NFA1, a second flat portion HW2 overlapping the second non-folded area NFA2, and a pattern portion PW overlapping the folded area FA.

[0122] The pattern portion PW can include a concave region CP recessed in a direction from the protective layer PF toward the base substrate VL. According to the present embodiment, the concave region CP can have a concave shape in a cross-section in the first direction DR1. The first adhesive layer AD1 can be filled in the concave region CP.

[0123] According to an embodiment supported by the present disclosure, the base substrate VL can be formed of a transparent resin. The transparent resin used to make the base substrate VL can be a high viscosity resin. The resin used to make the base substrate VL can have a viscosity of 1000 cP to 2500 cP. The base substrate VL can have a modulus of 0.5 GPa to 2 GPa and a crack strain of 2% to 15%.

[0124] According to an embodiment supported by the present disclosure, a minimum thickness TH1 of the pattern portion PW can be 10 µm to 40 µm. A second thickness TH2 of each of the first flat portion HW1 and the second flat portion HW2 can be 50 µm to 100 µm.

[0125] According to an embodiment supported by the present disclosure, since the base substrate VL of the window WL includes a transparent resin, manufacturing costs for the window WL can be reduced. In some aspects, the varying thickness of the pattern portion PW overlapping the folded area FA can prevent a crack from occurring in the base substrate VL during a folding operation of the display device ED. Accordingly, a display device ED having improved folding characteristics can be provided.

[0126] Referring to Figure 7 , the display device ED-1 according to an embodiment can include a window WL-1 and an optical layer RPL disposed below the window WL-1.

[0127] The window WL-1 according to an embodiment can include a protective layer PF and a base substrate VL-1. The protective layer PF and the base substrate VL-1 can be joined to each other by a first adhesive layer AD1. A top surface of the base substrate VL-1 can contact the first adhesive layer AD1.

[0128] The base substrate VL-1 can include a first flat portion HW1 overlapping the first non-folded area NFA1, a second flat portion HW2 overlapping the second non-folded area NFA2, and a pattern portion PW overlapping the folded area FA.

[0129] The pattern portion PW can include a recessed region CP recessed in a direction from the protective layer PF toward the base substrate VL-1. According to the present embodiment, the recessed region CP can have a concave shape in a cross section in the first direction DR1. The first adhesive layer AD1 can be filled in the recessed region CP.

[0130] The bottom surface of the base substrate VL-1 can be disposed directly on the protective layer PF. That is, the bottom surface of the base substrate VL-1 can contact the protective layer PF. According to the present embodiment, the base substrate VL-1 can be provided by directly applying a transparent resin onto the protective layer PF via an inkjet process or a dot coating process.

[0131] Referring to Figure 8 , the display device ED-2 according to the embodiment can include a window WL-2 and an optical layer RPL disposed below the window WL-2.

[0132] The window WL-2 according to the embodiment can include a transparent film IRF and a coating layer VL-2 disposed on the transparent film IRF. The coating layer VL-2 can be provided by directly applying a transparent resin onto the transparent film IRF via an inkjet process or a dot coating process. The coating layer VL-2 can include a transparent resin. The transparent film IRF can include one of polyethylene terephthalate (PET) and clear polyimide (CPI). The coating layer VL-2 can be joined to the protective layer PF by a first adhesive layer AD1. A top surface of the coating layer VL-2 can contact the first adhesive layer AD1.

[0133] The coating layer VL-2 can include a first flat portion HW1 overlapping the first non-folded area NFA1, a second flat portion HW2 overlapping the second non-folded area NFA2, and a pattern portion PW overlapping the folded area FA.

[0134] The pattern portion PW can include a recessed region CP recessed in a direction from the protective layer PF toward the transparent film IRF. According to the present embodiment, the recessed region CP can have a concave shape in a cross section in the first direction DR1. The first adhesive layer AD1 can be filled in the recessed region CP.

[0135] According to the present embodiment, the transparent film IRF and the optical layer RPL can be joined to each other by a second adhesive layer AD2.

[0136] Referring to Figure 9 , the display device ED-3 according to the embodiment can include a window WL-3 and an optical layer RPL disposed below the window WL-3.

[0137] The window WL-3 according to the embodiment can include a thin film glass substrate UTG and a coating layer VL-3 disposed on the thin film glass substrate UTG. The coating layer VL-3 can be provided by directly applying a transparent resin to the thin film glass substrate UTG via an inkjet process or a dot coating process. The thin film glass substrate UTG can be a chemically strengthened glass. The thin film glass substrate UTG according to the embodiment can have a thickness of 15 µm to 45 µm.

[0138] The coating layer VL-3 can be joined to the protective layer PF by the first adhesive layer AD1. A top surface of the coating layer VL-3 can contact the first adhesive layer AD1.

[0139] The coating layer VL-3 can include a first flat portion HW1 overlapping the first non-folded area NFA1, a second flat portion HW2 overlapping the second non-folded area NFA2, and a pattern portion PW overlapping the folded area FA.

[0140] The pattern portion PW can include a concave region CP recessed in a direction from the protective layer PF toward the thin film glass substrate UTG. According to an embodiment, the concave region CP can have a concave shape in a cross-section in the first direction DR1. The first adhesive layer AD1 can be filled in the concave region CP.

[0141] According to an embodiment, the thin film glass substrate UTG and the optical layer RPL can be joined to each other by the second adhesive layer AD2.

[0142] Referring to Figure 10 The display device ED-4 according to the embodiment can include a window WL-4 and an optical layer RPL disposed below the window WL-4. The window WL-4 and the optical layer RPL can be joined to each other by the second adhesive layer AD2.

[0143] The window WL-4 according to the embodiment can include a protective layer PF and a base substrate VL-4. The protective layer PF and the base substrate VL-4 can be joined to each other by the first adhesive layer AD1. According to an embodiment, a top surface of the base substrate VL-4 can contact the first adhesive layer AD1, and a bottom surface of the base substrate VL-4 can contact the second adhesive layer AD2. The base substrate VL-4 can include a transparent resin.

[0144] The base substrate VL-4 can include a first flat portion HW1 overlapping the first non-folded area NFA1, a second flat portion HW2 overlapping the second non-folded area NFA2, and a pattern portion PW overlapping the folded area FA.

[0145] The pattern portion PW can include a recessed area CP recessed in a direction toward the base substrate VL from the protective layer PF. According to an embodiment, the recessed area CP can have a stepped portion (i.e., a shape having a staircase) that gradually descends in a direction toward a center of the recessed area CP in a cross-section in the first direction DR1. That is, the recessed area CP can have a stepped portion (i.e., a shape having a staircase) that gradually descends in a direction toward a center of the recessed area CP from the first flat portion HW1 and a stepped portion (i.e., a shape having a staircase) that gradually descends in a direction toward a center of the recessed area CP from the second flat portion HW2.

[0146] Referring to Figure 11 , the display device ED-5 according to an embodiment can include a window WL-5 and an optical layer RPL disposed below the window WL-5. The window WL-5 and the optical layer RPL can be bonded to each other by a second adhesive layer AD2.

[0147] The window WL-5 according to an embodiment can include a protective layer PF and a base substrate VL-5. The protective layer PF and the base substrate VL-5 can be bonded to each other by a first adhesive layer AD1. According to an embodiment, a top surface of the base substrate VL-5 can contact the first adhesive layer AD1, and a bottom surface of the base substrate VL-5 can contact the second adhesive layer AD2. The base substrate VL-5 can include a transparent resin.

[0148] The base substrate VL-5 can include a first flat portion HW1 overlapping the first non-folded area NFA1, a second flat portion HW2 overlapping the second non-folded area NFA2, and a pattern portion PW overlapping the folded area FA.

[0149] The pattern portion PW can include a recessed area CP recessed in the protective layer PF in a direction toward the base substrate VL-5. According to an embodiment, the recessed area CP can have a concave shape in a cross-section in the first direction DR1. More specifically, the shape can include valleys G and ridges M alternately arranged in the first direction DR1. The valleys G can have a concave shape protruding in the third direction DR3, and the ridges M can have a concave shape recessed in the third direction DR3. That is, the recessed area CP of the pattern portion PW has a cross-sectional shape including the valleys G and the ridges M connected to each other. Since the valleys G and the ridges M are alternately arranged, the recessed area CP can have a concave shape in a direction from the protective layer PF toward the base substrate VL. That is, for example, the valleys G and the ridges M can be alternately arranged along the concave shape in the recessed area CP.

[0150] Figure 12A and Figure 12B is a cross-sectional view illustrating a method for manufacturing a display device according to an embodiment supported by the present disclosure. Figure 12A and Figure 12B is a cross-sectional view illustrating a method for manufacturing a display device according to an embodiment supported by the present disclosure.Figure 8 The process of forming the window WL-2 on the optical layer RPL described in

[0151] A method for manufacturing a display device according to an embodiment (hereinafter, the method) can include a process of providing an optical layer to which an adhesive layer is attached, a process of performing a layering process including adhering a transparent film to the adhesive layer, and a process of forming a coating layer including a pattern portion having a concave shape by discharging an ink onto the transparent film. Here, the ink can include a transparent resin, and the pattern portion can have a minimum thickness of 10 µm to 40 µm.

[0152] Referring to Figure 12A , the method can include a process of providing the optical layer RPL. The method can include bonding the transparent film IRF to the optical layer RPL by the second adhesive layer AD2. The method can include bonding the transparent film IRF to the optical layer RPL by the layering process. The transparent film IRF can include one of polyethylene terephthalate (PET) and clear polyimide (CPI).

[0153] Thereafter, referring to Figure 12B , the method can include a process of forming the coating layer VL-2 on the transparent film IRF. The method can include forming the coating layer VL-2 on the transparent film IRF, for example, by controlling the head HD so that the head HD discharges the ink IN while moving in the first direction DR1. The ink IN can include a transparent resin. The method can include applying (by discharging) the ink IN onto the transparent film IRF and then curing the ink IN.

[0154] Here, the coating layer VL-2 can be formed to have a concave recessed area CP in which a portion overlapping the folding area FA (referring to Figure 8 ) is recessed in a concave shape. The coating layer VL-2 can be formed by an inkjet process or a dot coating process. The ink IN can have a high viscosity to form the recessed area CP by applying a transparent resin. The ink IN can have a viscosity of 1000 cP to 2500 cP.

[0155] According to an embodiment, the optical layer RPL and the transparent film IRF can be layered, and then the coating layer VL-2 can be formed on the transparent film IRF.

[0156] Figure 13A And Figure 13B are cross-sectional views illustrating a method for manufacturing a display device according to an embodiment supported by the disclosure. Figure 13A And Figure 13B illustrate Figure 8 the process of forming the window WL-2 on the optical layer RPL described in

[0157] A method of manufacturing a display device according to an embodiment can include a process of forming a coating layer including a pattern portion having a concave shape by discharging an ink onto a transparent film, and a process of performing a lamination process including adhering the transparent film to an optical layer disposed below the transparent film by an adhesive layer. Here, the ink can include a transparent resin, and the ink can have a viscosity of 1000 cP to 2500 cP.

[0158] Referring to Figure 13A , the method can include a process of forming a coating layer VL-2 on the transparent film IRF. The transparent film IRF can include one of polyethylene terephthalate (PET) and clear polyimide (CPI).

[0159] The method can include forming the coating layer VL-2 on the transparent film IRF, for example, by controlling the head HD so that the head HD discharges the ink IN while moving in the first direction DR1. The ink IN can include a transparent resin. The coating layer VL-2 can be formed by an inkjet process or a dot coating process. The method can include applying (by discharging) the ink IN onto the transparent film IRF and then curing the ink IN.

[0160] The ink IN can have a high viscosity. Accordingly, for example, applying the ink IN (including a transparent resin) onto the transparent film IRF can form the concave region CP. The ink IN can have a viscosity of 1000 cP to 2500 cP.

[0161] Thereafter, referring to Figure 13B , the method can include a process of forming an optical layer RPL on the transparent film IRF. The method can include engaging the transparent film IRF and the optical layer RPL to each other by a second adhesive layer AD2 between the transparent film IRF and the optical layer RPL by a lamination process.

[0162] According to an embodiment, after the process of forming the optical layer RPL on the transparent film IRF, the method can include performing a lamination process of engaging the optical layer RPL to the transparent film IRF.

[0163] In the description of the method and the processes herein, the operations can be performed in a different order than shown and / or described, or the operations can be performed at different times, or different operations can be excluded, repeated, or additional operations can be added. The description of elements "may be disposed," "may be formed," and the like includes methods, processes, and techniques for disposing, forming, positioning, and modifying elements, etc. according to the example aspects described herein.

[0164] According to embodiments supported by the present disclosure, the variable thickness of the pattern portion included in the window can prevent cracks from occurring in the window during a folding operation of the display device. Accordingly, a display device having improved folding characteristics can be provided.

[0165] In some aspects, since the base substrate of the window includes a transparent resin, manufacturing costs for the window can be reduced.

[0166] Although example embodiments supported by aspects of the present disclosure have been described, it will be understood that the present disclosure should not be limited to the example embodiments, but various changes and modifications can be made by those of ordinary skill in the art within the spirit and scope of the present disclosure claimed by the appended claims. Accordingly, the actual scope of the present disclosure should be determined by the technical scope of the appended claims.

Claims

1. A display device, characterized by comprising: The display device includes: a display module including a folding area foldable based on a folding axis extending in a first direction, a first non-folding area, and a second non-folding area, wherein the first non-folding area and the second non-folding area are spaced apart from each other in a second direction intersecting the first direction; a window disposed on the display module; and an optical layer disposed between the display module and the window; wherein the window includes: a base substrate including a pattern portion overlapping the folding area, a first flat portion overlapping the first non-folding area, and a second flat portion overlapping the second non-folding area; and a protective layer disposed on the base substrate, wherein the pattern portion includes a recessed area recessed in a direction from the protective layer toward the base substrate. 2.The display device of claim 1, wherein: the pattern portion has a minimum thickness of 10 µm to 40 µm; and each of the first flat portion and the second flat portion has a thickness of 50 µm to 100 µm.

3. The display device according to claim 1, wherein The display device further includes a first adhesive layer disposed between the protective layer and the base substrate, wherein the first adhesive layer fills in the recessed area of the pattern portion.

4. The display device according to claim 1, wherein The recessed area of the pattern portion has a concave shape.

5. The display device according to claim 4, wherein The recessed area of the pattern portion has a cross-sectional shape including a valley and a ridge connected to each other.

6. The display device according to claim 1, wherein The recessed area of the pattern portion includes a stepped portion gradually descending in a direction from the first flat portion toward a center of the recessed area, and the recessed area of the pattern portion includes a stepped portion gradually descending in a direction from the second flat portion toward the center of the recessed area.

7. The display device according to claim 1, wherein The display device further includes a second adhesive layer disposed between the optical layer and the base substrate.

8. The display device according to claim 7, wherein The base substrate includes: a transparent film disposed on the second adhesive layer; and a coating layer disposed on the transparent film.

9. The display device according to claim 7, wherein The base substrate includes a thin film glass substrate disposed on the second adhesive layer.

10. The display device according to claim 9, wherein The base substrate includes a coating layer disposed on the thin film glass substrate.

11. The display device according to claim 1, wherein The base substrate directly contacts the optical layer.

12. The display device according to claim 1, wherein The display device further includes: a lower film disposed below the display module; a support plate disposed below the lower film; and a lower plate disposed below the support plate.

13. The display device of claim 12, wherein, The lower plate includes a hole overlapping the folding area and passing through the lower plate.

Images