Display device and method of manufacturing same

Abstract

A display device and a method of manufacturing the same are provided. The display device includes a display panel having a first non-folding area, a folding area, and a second non-folding area continuously arranged in a first direction. The folding region is adjacent to the first non-folding region and the second non-folding region and is foldable about a folding axis. The lower substrate is disposed below the display panel. The lower substrate includes a spacer portion and a pattern portion. And the spacing part is overlapped with the folding area on the plane. The pattern portion is spaced apart from the display panel by the spacing portion in a thickness direction of the display device. The pattern portion includes a plurality of holes.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims the priority of Korean Patent Application No. 10-2023-0099216 filed in the Korean Intellectual Property Office on July 28, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Embodiments of the present disclosure described herein relate to a display device including a lower substrate and a method of manufacturing the display device. Background Art

[0004] The display device displays various images on a display screen and provides information to a user. Generally, the display device displays information on an assigned screen. Flexible display devices are being developed, which include flexible display panels that can be foldable, rollable, or bendable, unlike rigid display devices. Since the flexible display device has a shape that can be changed in various ways, the flexible display device can be carried regardless of the size of the existing screen. Therefore, the user convenience and portability of the display device can be improved.

[0005] In the development of flexible display devices, a lower substrate disposed under a flexible display panel is also being developed. For example, the lower substrate can reduce stress applied to the display panel when the display panel is folded, rolled or bent, and can absorb external impact. Summary of the invention

[0006] An embodiment of the present disclosure provides a display device including a lower substrate.

[0007] An embodiment of the present disclosure provides a method of manufacturing a display device including a lower substrate.

[0008] According to an embodiment of the present disclosure, a display device includes a display panel having a first non-folding area, a folding area, and a second non-folding area arranged continuously in a first direction. The folding area is adjacent to the first non-folding area and the second non-folding area and can be folded around a folding axis. A lower substrate is arranged below the display panel. The lower substrate includes a spacer portion and a pattern portion. The spacer portion overlaps with the folding area on a plane. The pattern portion is spaced apart from the display panel by the spacer portion in a thickness direction of the display device. The pattern portion includes a plurality of holes.

[0009] In an embodiment, a width of the pattern portion in the first direction may increase with increasing distance from the display panel in a thickness direction of the display device.

[0010] In an embodiment, the lower substrate may include a first region overlapping the first non-folding region, a second region overlapping the second non-folding region, and a third region overlapping the folding region. The third region includes a spacer portion and a pattern portion. The first region, the second region, and the third region may include the same material as each other.

[0011] In an embodiment, the lower substrate may be a glass substrate.

[0012] In an embodiment, the spacer portion may have a height less than or equal to one third of the thickness of the lower substrate.

[0013] In an embodiment, the spacer portion may have a height in a range of about 10 micrometers to about 100 micrometers.

[0014] In an embodiment, the spacing portion may have a width in the first direction greater than a width of the folding region in the first direction.

[0015] In an embodiment, the space portion may have a width in the first direction greater than a width of the pattern portion in the first direction.

[0016] In an embodiment, the display device may further include a resin material filling the spacer portion.

[0017] In an embodiment, the plurality of holes may extend in a second direction intersecting the first direction. The plurality of holes may include a first hole group and a second hole group spaced apart from each other in the first direction. The first hole group and the second hole group may be staggered with each other.

[0018] According to an embodiment of the present disclosure, a method for manufacturing a display device includes preparing a preliminary lower substrate including a first area, a second area spaced apart from the first area in a first direction, and a third area defined between the first area and the second area. A first laser is applied along a boundary of the third area. A second laser is applied between the portions to which the first laser is applied. A display panel is formed on the preliminary lower substrate. A spacing portion and a pattern portion are formed by etching the preliminary lower substrate. The pattern portion is spaced apart from the display panel by the spacing portion in a thickness direction of the display device. The pattern portion includes a plurality of holes.

[0019] In an embodiment, the method may further include: placing an etching protection film on the display panel.

[0020] In an embodiment, the method may further include filling the spacing portion with a resin material.

[0021] In an embodiment, the second laser may have an intensity higher than that of the first laser.

[0022] In an embodiment, applying the first laser may include focusing the first laser on an upper portion of the preliminary lower substrate and etching a portion of the preliminary lower substrate.

[0023] In an embodiment, applying the first laser may include focusing the first laser on a middle portion of the preliminary lower substrate and etching a portion of the preliminary lower substrate.

[0024] In an embodiment, applying the second laser may include focusing the second laser on an upper portion of the preliminary lower substrate and etching a portion of the preliminary lower substrate.

[0025] In an embodiment, applying the second laser may include focusing the second laser on a middle portion of the preliminary lower substrate and etching a portion of the preliminary lower substrate.

[0026] In an embodiment, applying the second laser may include focusing the second laser on a lower portion of the preliminary lower substrate and etching a portion of the preliminary lower substrate.

[0027] In an embodiment, applying the second laser may include focusing the second laser on an upper portion, a middle portion, and a lower portion of the preliminary lower substrate and etching a portion of the preliminary lower substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects and features of the present disclosure will become apparent by describing in detail non-limiting embodiments of the present disclosure with reference to the accompanying drawings.

[0029] Figure 1A is a perspective view showing a display device in an unfolded state according to an embodiment of the present disclosure.

[0030] Figure 1B is a perspective view illustrating a folding operation of a display device according to an embodiment of the present disclosure.

[0031] Figure 1C is a plan view showing a display device in a folded state according to an embodiment of the present disclosure.

[0032] Figure 1D is a perspective view illustrating a folding operation of a display device according to an embodiment of the present disclosure.

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

[0034] Figure 3 is a cross-sectional view of a display panel according to an embodiment of the present disclosure.

[0035] Figure 4 is a perspective view of a portion of a display device according to an embodiment of the present disclosure.

[0036] Figure 5 is a perspective view of a lower substrate according to an embodiment of the present disclosure.

[0037] Figure 6is a cross-sectional view of a portion of a foldable display device according to an embodiment of the present disclosure.

[0038] Figure 7 is a perspective view of a portion of a display device according to an embodiment of the present disclosure.

[0039] FIG. 8A to FIG. 8D are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure.

[0040] Fig.9A and Fig. 9B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure.

[0041] Fig. 10A and Fig. 10B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure.

[0042] Fig.11A and Fig. 11B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure.

[0043] Fig. 12A and Fig. 12B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] In this specification, when a component (or region, layer, part, etc.) is referred to as being "on", "connected to" or "coupled to" another component, this means that the component may be directly on, directly connected to or directly coupled to another component, or there may be intervening components therebetween. When a component is referred to as being "directly on", "directly connected to" or "directly coupled to" another component, there are no intervening components.

[0045] The same reference numerals refer to the same components. Additionally, in the drawings, the thickness, proportion and size of the components may be exaggerated for effective description. As used herein, the term "and / or" includes all of one or more combinations defined by the relevant components.

[0046] Terms such as first, second and similar can be used to describe various components, but components should not be limited by these terms. Terms can only be used to distinguish one component from other components. For example, without departing from the scope of the embodiments of the present disclosure, a first component can be referred to as a second component, and similarly, a second component can also be referred to as a first component. Unless otherwise specified, terms in the singular may include plural forms.

[0047] In addition, terms such as "below", "below", "above", and "on" are used to describe the relationship of components shown in the drawings. The terms are relative concepts and are described based on the directions shown in the drawings.

[0048] It should be understood that terms such as “includes,” “comprising,” and “having,” when used herein, specify the presence of stated features, numbers, steps, operations, components, parts, or a combination thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or a combination thereof.

[0049] Unless otherwise defined, all terms (including technical or scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. Such terms defined in commonly used dictionaries should be interpreted as having the same meaning as the contextual meaning in the relevant technical field, and unless explicitly defined as having such meaning in this application, should not be interpreted as having an ideal or excessive form of meaning.

[0050] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0051] Figure 1A is a perspective view showing a display device DD in a deployed state according to an embodiment of the present disclosure.

[0052] Reference Figure 1A , the display device DD may be a device activated according to an electrical signal. The display device DD may include various embodiments. For example, in an embodiment, the display device DD may include a computer (e.g., a tablet computer, a notebook computer), a smart TV, or the like. However, the embodiments of the present disclosure are not necessarily limited thereto. Figure 1A , for convenience of explanation, the display device DD is shown as a smart phone.

[0053] In an embodiment, the display device DD may display an image IM in a third direction DR3 on a first display surface FS parallel to a plane defined by the first direction DR1 and the second direction DR2. The first display surface FS on which the image IM is displayed may correspond to a front surface of the display device DD. In an embodiment, the image IM may include at least one static image and / or at least one dynamic image. Figure 1A , an Internet search window, a clock, a calendar, and a weather window, and a plurality of applications are shown as examples of the image IM. However, the embodiments of the present disclosure are not necessarily limited thereto.

[0054] In an embodiment, the upper surface (e.g., front surface) and the lower surface (e.g., rear surface) of the component are defined based on the direction in which the image IM is displayed. The front surface and the rear surface may be opposite to each other in the third direction DR3, and the normal direction of the front surface and the normal direction of the rear surface may be parallel to the third direction DR3.

[0055] The spacing distance between the front and rear surfaces of the display device DD in the third direction DR3 may correspond to the thickness / height of the display device DD in the third direction DR3. The directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 may be relative concepts and may be changed to different directions.

[0056] The display device DD may sense an external input applied to the display device DD. In an embodiment, the external input may include various forms of input provided from outside the display device DD. For example, the external input may include not only direct contact with a part of the user's body (such as the user's hand) or an input device (such as a pen), but may also include an external input applied near the display device DD or adjacent to the display device DD at a predetermined distance (e.g., hovering). The external input may have various forms, such as force, pressure, temperature, light, and the like.

[0057] Figure 1A An external input through a user's pen SS is shown. In some embodiments, the pen SS may be attached to the inside or outside of the display device DD and may be detached from the display device DD. The display device DD may provide and receive signals corresponding to the attachment and detachment of the pen SS.

[0058] In an embodiment, the display device DD may include a first display surface FS and a second display surface RD. The first display surface FS may include a first active area F-AA, a first peripheral area F-NAA and an electronic module area EMA. The second display surface RD may be defined as a surface facing away from at least a portion of the first display surface FS (e.g., in a third direction DR3).

[0059] The first active area F-AA may be an area activated according to an electrical signal. The first active area F-AA may be an area on which an image IM is displayed and an input of the pen SS is sensed.

[0060] The first peripheral area F-NAA may be adjacent to the first active area F-AA (e.g., in the first direction DR1 and / or the second direction DR2). In an embodiment, the first peripheral area F-NAA may have a predetermined color. The first peripheral area F-NAA may surround the first active area F-AA (e.g., in the first direction DR1 and / or the second direction DR2). Accordingly, the shape of the first active area F-AA may be substantially defined by the first peripheral area F-NAA. However, the embodiments of the present disclosure are not necessarily limited to this. For example, in some embodiments, the first peripheral area F-NAA may be disposed adjacent to only one side of the first active area F-AA, or may be omitted.

[0061] The electronic module area EMA may have various electronic modules arranged therein. For example, in an embodiment, the electronic module may include at least one of a camera, a speaker, a light detection sensor, and a heat detection sensor. In some embodiments, the electronic module area EMA may sense an external object received through the first display surface FS and the second display surface RD, or may provide a sound signal such as voice to the outside through the first display surface FS and the second display surface RD. The electronic module may include multiple components and is not necessarily limited to any one embodiment.

[0062] The electronic module area EMA may be surrounded by the first peripheral area F-NAA. However, the embodiments of the present disclosure are not necessarily limited thereto. For example, in an embodiment, the electronic module area EMA may be surrounded by the first active area F-AA and the first peripheral area F-NAA, and the electronic module area EMA may be disposed in the first active area F-AA.

[0063] The display device DD according to the embodiment may include at least one folding area FA and a plurality of non-folding areas extending from the folding area FA, such as a first non-folding area NFA1 and a second non-folding area NFA2. For example, the first non-folding area NFA1, the folding area FA, and the second non-folding area NFA2 may be continuously arranged in a first direction DR1. For example, the first non-folding area NFA1 may extend from the folding area FA in a direction opposite to the first direction DR1, and the second non-folding area NFA2 may extend from the folding area FA in the first direction DR1.

[0064] The folding area FA may be referred to as a foldable area, and the first non-folding area NFA1 and the second non-folding area NFA2 may be referred to as non-foldable areas. The folding area FA may be adjacent to the first non-folding area NFA1 and the second non-folding area NFA2, and may be folded about the first folding axis AX1 or the second folding axis AX2 (refer to Figure 1B or Figure 1D )fold.

[0065] Figure 1B is a perspective view illustrating a folding operation of the display device DD according to an embodiment of the present disclosure.

[0066] Reference Figure 1B , the display device DD according to the embodiment may be folded around the first folding axis AX1 extending in the second direction DR2. In the embodiment, in the folded state of the display device DD, the folding area FA may have a predetermined curvature and a predetermined curvature radius. The display device DD may be folded around the first folding axis AX1, and may be changed to an inward folded state in which 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.

[0067] Figure 1C is a plan view showing a display device DD in a folded state according to an embodiment of the present disclosure.

[0068] Reference Figure 1C , when the display device DD according to the embodiment is in the inward folded state, the second display surface RD may be visible to the user. In this case, the second display surface RD may include a second active area R-AA displaying an image. The second active area R-AA may be an area activated according to an electrical signal. In an embodiment, the second active area R-AA may be an area on which an image is displayed and various forms of external inputs are sensed.

[0069] The second display surface RD may further include a second peripheral area R-NAA. The second peripheral area R-NAA may be adjacent to the second active area R-AA (for example, in the first direction DR1 and / or the second direction DR2). In an embodiment, the second peripheral area R-NAA may have a predetermined color. The second peripheral area R-NAA may surround the second active area R-AA (for example, in the first direction DR1 and / or the second direction DR2). In addition, in an embodiment, the second display surface RD may further include an electronic module area in which an electronic module including various components is disposed. However, embodiments of the present disclosure are not necessarily limited thereto.

[0070] Figure 1D is a perspective view illustrating a folding operation of the display device DD according to an embodiment of the present disclosure.

[0071] Reference Figure 1D , the display device DD according to the embodiment can be folded around the second folding axis AX2 extending in the second direction DR2. The display device DD can be folded around the second folding axis AX2, and can be changed to an outward folding state in which the first display surface FS is exposed to the outside and the second display surface RD is not exposed to the outside. In an embodiment of the present disclosure, the display device DD can be configured so that an inward folding operation and an outward folding operation can be repeatedly performed from the unfolded state of the display device DD. However, the embodiments of the present disclosure are not necessarily limited to this.

[0072] exist Figures 1A to 1D, the display device DD is shown as being folded around one folding axis (e.g., the first folding axis AX1 or the second folding axis AX2). However, the number of folding axes and the number of non-folding areas according to the number of folding axes are not necessarily limited thereto. For example, in an embodiment, the display device DD may be folded around a plurality of folding axes so that a portion of the first display surface FS and a portion of the second display surface RD face each other.

[0073] Figure 2 is a cross-sectional view of a display device DD according to an embodiment of the present disclosure.

[0074] Reference Figure 2 , the display device DD may include a window module 300, an optical film 200, a display panel 100, and a lower substrate CS. In addition, the display device DD may further include adhesive layers 1031, 1032, 1020, and 1010 that bond the components.

[0075] In an embodiment, the adhesive layers 1031, 1032, 1020, and 1010 described below may be transparent adhesive layers each including one of a pressure-sensitive adhesive (PSA) film, an optically clear adhesive (OCA) film, and an optically clear resin (OCR) film. However, the embodiments of the present disclosure are not necessarily limited thereto. In addition, at least one adhesive layer among the adhesive layers 1031, 1032, 1020, and 1010 may be omitted.

[0076] The window module 300 may be disposed on the display panel 100. In embodiments, the window module 300 may be coupled with a housing to define the exterior of the display device DD and may protect the display panel 100. In embodiments, the window module 300 may include a glass substrate 330, a window protective layer 320, and a light blocking pattern 340.

[0077] The glass substrate 330 may include a material having high light transmittance. In an embodiment, the glass substrate 330 may be a chemically strengthened glass substrate. The glass substrate 330 may minimize creases even if a folding operation and an unfolding operation are repeated.

[0078] The window protection layer 320 may be disposed on the glass substrate 330 (e.g., in the third direction DR3). The window protection layer 320 and the glass substrate 330 may be coupled to each other by an adhesive layer 1031 disposed therebetween (e.g., in the third direction DR3). In an embodiment, the window protection layer 320 may include a plastic film. For example, the window protection layer 320 may include at least one of polyimide, polycarbonate, polyamide, triacetyl cellulose, polymethyl methacrylate, and polyethylene terephthalate. However, embodiments of the present disclosure are not necessarily limited thereto.

[0079] The light blocking pattern 340 may be disposed on (eg, directly on) the lower surface of the window protection layer 320. The light blocking pattern 340 may be disposed on one surface of the window protection layer 320 facing the glass substrate 330. In an embodiment, the adhesive layer 1031 may cover the light blocking pattern 340. However, embodiments of the present disclosure are not necessarily limited thereto.

[0080] In an embodiment, the light-blocking pattern 340 may be a colored light-blocking film and may be formed by, for example, a coating method. In an embodiment, the light-blocking pattern 340 may include a base material and a dye or pigment mixed in the base material. Accordingly, a user may identify the first peripheral area F-NAA of the display device DD by the color of the light-blocking pattern 340 (refer to Figure 1A ). For example, the light blocking pattern 340 may overlap the first peripheral area F-NAA.

[0081] Although Figure 2 The light blocking pattern 340 is shown as being spaced apart from the end of the window protection layer 320 by a predetermined distance inwardly (e.g., in the first direction DR1), but the embodiments of the present disclosure are not necessarily limited thereto. For example, in an embodiment, the light blocking pattern 340 may be disposed on the bottom of the window protection layer 320 so as to be aligned with the end of the window protection layer 320. In addition, as an example, in Figure 2 3 shows a light blocking pattern 340 disposed on the lower surface of the window protection layer 320. However, the embodiments of the present disclosure are not necessarily limited thereto. For example, in some embodiments, the light blocking pattern 340 may be disposed on the upper surface of the window protection layer 320, or may be disposed on one of the upper surface and the lower surface of the glass substrate 330.

[0082] The window module 300 may further include a hard coating layer 310. The hard coating layer 310 may be disposed on the window protection layer 320 (e.g., directly thereon in the third direction DR3), and may be correspondingly disposed in the outermost layer of the window module 300. In an embodiment, the hard coating layer 310 may be a functional layer for improving the use characteristics of the display device DD, and may be provided on the window protection layer 320 by a coating method. For example, in an embodiment, anti-fingerprint properties, anti-pollution properties, anti-reflection properties, or anti-scratch properties may be improved by the hard coating layer 310.

[0083] The optical film 200 may be disposed under the window module 300. The optical film 200 and the window module 300 may be coupled to each other by an adhesive layer 1032. The optical film 200 may reduce the external light reflectivity of the display panel 100 with respect to the light incident to the display panel 100. In an embodiment, the optical film 200 may further include at least one of an anti-reflection film, a polarizing film, a color filter, and a gray filter.

[0084] The display panel 100 may be disposed below the optical film 200. In an embodiment, the display panel 100 and the optical film 200 may be coupled to each other by an adhesive layer 1020. In an embodiment, the display panel 100 may be used as an output device for displaying an image, and may be used as an input device for sensing an input applied from the outside. For example, the display panel 100 may include a display layer and a sensor layer. The display layer may be a component that substantially generates an image. In an embodiment, the display layer may be one of an organic light emitting display panel, a quantum dot display panel, and an inorganic light emitting display panel. However, the embodiments of the present disclosure are not necessarily limited thereto.

[0085] The first non-folding area NFA1, the folding area FA, and the second non-folding area NFA2 may be continuously arranged in the first direction DR1 in the display panel 100. The first non-folding area NFA1, the folding area FA, and the second non-folding area NFA2 defined in the display panel 100 may be the same as those described above with reference to FIG. Figure 1A The first non-folding area NFA1, the folding area FA, and the second non-folding area NFA2 of the described display device DD are substantially the same.

[0086] The lower substrate CS may be disposed under the display panel 100. In an embodiment, the lower substrate CS and the display panel 100 may be coupled to each other by an adhesive layer 1010. The lower substrate CS may protect the display panel 100. For example, in an embodiment, the lower substrate CS may reduce stress applied to the display panel 100 when the display device DD is folded. In addition, the lower substrate CS may prevent external moisture from penetrating into the display panel 100 and may absorb external impact.

[0087] The lower substrate CS may include a first area AR1, a second area AR2, and a third area AR3. The first area AR1 may overlap with the first non-folding area NFA1 of the display panel 100, the second area AR2 may overlap with the second non-folding area NFA2 of the display panel 100, and the third area AR3 may overlap with the folding area FA. For example, the first area AR1, the third area AR3, and the second area AR2 of the lower substrate CS may be continuously arranged in the first direction DR1. In an embodiment, the first area AR1, the second area AR2, and the third area AR3 may include the same material as each other. For example, in an embodiment, the lower substrate CS may include a glass substrate. However, embodiments of the present disclosure are not necessarily limited thereto.

[0088] The spacer portion SP and the pattern portion PP may be defined in the third area AR3 of the lower substrate CS. The spacer portion SP of the lower substrate CS may overlap the folding area FA of the display panel 100 in a plane (e.g., in the third direction DR3). The pattern portion PP of the lower substrate CS may be spaced apart from the display panel 100 by the spacer portion SP in a cross-sectional view and may include a plurality of holes HO. A detailed description of the lower substrate CS will be given below.

[0089] Figure 3 is a cross-sectional view of a display panel 100 according to an embodiment of the present disclosure.

[0090] Reference Figure 3 In an embodiment, the display panel 100 may include a base layer BL, a circuit layer DP-CL, a display element layer DP-OL, and an encapsulation layer TFE.

[0091] The base layer BL may provide a base surface on which the circuit layer DP-CL is disposed. In an embodiment, the base layer BL may be a rigid substrate. However, the embodiments of the present disclosure are not necessarily limited thereto. For example, in some embodiments, the base layer BL may be a flexible substrate.

[0092] The base layer BL may include a first active area F-AA and a first peripheral area F-NAA. Figure 3 It is shown in Figure 1A The base layer BL may include a first active region F-AA and a first peripheral region F-NAA, but the embodiments of the present disclosure are not necessarily limited thereto. For example, in some embodiments, the base layer BL may include a second active region R-AA and a second peripheral region R-NAA.

[0093] The first active area F-AA may be an area activated according to an electrical signal. The first peripheral area F-NAA may be an area in which a driving circuit or driving wiring for driving an element disposed in the first active area F-AA, various types of signal lines for providing an electrical signal, and a pad are disposed.

[0094] The circuit layer DP-CL may be disposed on the base layer BL (eg, directly thereon in the third direction DR3 ). In embodiments, the circuit layer DP-CL may include at least one insulating layer, a driving element, a signal line, and a signal pad.

[0095] The display element layer DP-OL may be disposed on the circuit layer DP-CL (e.g., in the third direction DR3). The display element layer DP-OL may include a light emitting element disposed to overlap the first active area F-AA. The light emitting element of the display element layer DP-OL may be electrically connected to the driving element of the circuit layer DP-CL, and may provide source light through the first active area F-AA according to a signal of the driving element to display an image, such as an image IM (see Figure 1A ).

[0096] The encapsulation layer TFE may be disposed on the display element layer DP-OL and may seal the light emitting element. The encapsulation layer TFE may include a plurality of insulating films. In an embodiment, the insulating film of the encapsulation layer TFE may be disposed to improve the optical efficiency of the light emitting element or to protect the light emitting element.

[0097] Figure 4 is a perspective view of a portion of a display device DD according to an embodiment of the present disclosure. Figure 5 is a perspective view of a lower substrate CS according to an embodiment of the present disclosure. Figure 6 is a cross-sectional view of a portion of a folded display device DD according to an embodiment of the present disclosure. Figure 4 and Figure 6 The display panel 100, the lower substrate CS and the adhesive layer 1010 are shown in FIG. Figures 4 to 6 When, with reference Figure 2 and Figure 3 Components that are the same or similar to those described will be assigned the same or similar reference numerals, and for economy of description, repeated descriptions may be omitted.

[0098] Reference Figures 4 to 6 , the space part SP and the pattern part PP may be defined in the lower substrate CS.

[0099] The spacer portion SP of the lower substrate CS may overlap with the folding area FA of the display panel 100 on a plane (e.g., in the third direction DR3). In an embodiment, the spacer portion SP may be an empty space or area. In an embodiment, the height H-SP of the spacer portion SP may be less than or equal to one third of the thickness D-CS of the lower substrate CS. For example, in an embodiment, the height H-SP of the spacer portion SP may be in a range from about 10 micrometers to about 100 micrometers. For example, the thickness D-CS of the lower substrate CS may refer to the maximum thickness of the lower substrate CS.

[0100] The pattern portion PP of the lower substrate CS in the cross-sectional view may be spaced apart from the display panel 100 by the spacer portion SP (for example, in the third direction DR3 which is the thickness direction of the display device DD). In an embodiment, the width W-PP of the pattern portion PP in the first direction DR1 may gradually increase as the distance from the display panel 100 increases. For example, the width W-PP of the pattern portion PP in the first direction DR1 may gradually increase in a direction opposite to the third direction DR3.

[0101] The pattern portion PP may include a plurality of holes HO. The plurality of holes HO may extend in a second direction DR2 intersecting the first direction DR1. In an embodiment, the plurality of holes HO may be spaced apart from each other in the first direction DR1 and the second direction DR2. In an embodiment, each of the plurality of holes 110 may have a length of about 200 micrometers or less in the first direction DR1.

[0102] The plurality of holes HO may include a first hole group HG1 and a second hole group HG2. Each of the plurality of holes HO included in the first hole group HG1 and the second hole group HG2 may extend longitudinally in the second direction DR2. The plurality of holes HO of the first hole group HG1 may be spaced apart from each other in the second direction DR2, and the plurality of holes HO of the second hole group HG2 may be spaced apart from each other in the second direction DR2. The first hole group HG1 and the second hole group HG2 may be spaced apart from each other in the first direction DR1. In an embodiment, the first hole group HG1 and the second hole group HG2 may be staggered with each other.

[0103] In an embodiment, a width W-SP of the space portion SP of the lower substrate CS in the first direction DR1 may be greater than a width W-FA of the folding area FA in the first direction DR1. A width W-PP of the pattern portion PP of the lower substrate CS in the first direction DR1 may correspond to a width W-FA of the folding area FA of the display panel 100 in the first direction DR1. For example, a width W-SP of the space portion SP of the lower substrate CS in the first direction DR1 may be greater than a width W-PP of the pattern portion PP of the lower substrate CS in the first direction DR1.

[0104] According to an embodiment of the present disclosure, since the lower substrate CS includes the spacer portion SP, when the display device DD (refer to Figure 1A ) when the pattern portion PP is folded may not be transferred to the display panel 100. Accordingly, separation between the display panel 100 and the lower substrate CS may be reduced or eliminated.

[0105] Figure 7 is a perspective view of a portion of a display device DD according to an embodiment of the present disclosure. Figure 7 The display panel 100, the lower substrate CS, the adhesive layer 1010 and the resin material RM are shown in FIG. Figure 7 When, with reference Figures 2 to 6 Components that are the same or similar to those described will be assigned the same or similar reference numerals, and for economy of description, repeated descriptions may be omitted.

[0106] Reference Figure 7 The display device DD may further include a resin material RM. The spacer portion SP and the pattern portion PP may be defined in the lower substrate CS, and the resin material RM may fill the spacer portion SP of the lower substrate CS. In an embodiment, the resin material RM may include at least one of epoxy, urethane, and acrylate.

[0107] Since the resin material RM fills the space portion SP, tension generated when the display device DD is folded may be reduced, and folding stability of the display device DD may be increased.

[0108] FIG. 8A to FIG. 8D1 is a cross-sectional view showing some steps of a method for manufacturing a display device according to an embodiment of the present disclosure. FIG. 8A to FIG. 8D When, with reference Figures 2 to 7 Components that are the same or similar to those described will be assigned the same or similar reference numerals, and for economy of description, repeated descriptions may be omitted.

[0109] According to an embodiment of the present disclosure, a method for manufacturing a display device may include: a step of preparing a preliminary lower substrate including a first zone, a second zone spaced apart from the first zone in a first direction, and a third zone defined between the first zone and the second zone (for example, in the first direction); a step of applying a first laser along a boundary of the third zone; a step of applying a second laser between portions to which the first laser is applied; a step of forming a display panel on the preliminary lower substrate; and a step of etching the preliminary lower substrate to form a spacer portion, and a pattern portion spaced apart from the display panel by the spacer portion in a cross-sectional view and including a plurality of holes.

[0110] Reference Fig. 8A , the method for manufacturing a display device disclosed in the present invention may include: a step of preparing a preliminary lower substrate CS-1; a step of applying a first laser LS1; and a step of applying a second laser LS2.

[0111] The preliminary lower substrate CS-I may include a first area AR1, a second area AR2, and a third area AR3 (for example, arranged continuously in the first direction DR1). The second area AR2 may be spaced apart from the first area AR1 in the first direction DR1, and the third area AR3 may be defined between the first area AR1 and the second area AR2. For example, the first area AR1, the third area AR3, and the second area AR2 of the preliminary lower substrate CS-I may be arranged continuously in the first direction DR1. In an embodiment, the preliminary lower substrate CS-I may have a thickness in the range of about 100 microns to about 500 microns.

[0112] The first laser device LSD1 may apply the first laser LS1 along a boundary of the third area AR3. For example, the first laser device LSD1 may apply the first laser LS1 along a boundary between the first area AR1 and the third area AR3 and a boundary between the second area AR2 and the third area AR3. Fig. 8A In the cross-sectional view of FIG. 1 , it is shown that the first laser LS1 is applied twice. In an embodiment, the step of applying the first laser LS1 may include the step of focusing the first laser LS1 on the upper portion of the preliminary lower substrate CS-I and etching a portion of the preliminary lower substrate CS-I. In an embodiment, the portion on which the first laser LS1 is applied may be the lower substrate CS described below (refer to Fig.8D ) of the interval part SP (refer to Fig.8D ).

[0113] Thereafter, the second laser device LSD2 may apply the second laser LS2 between the two portions on which the first laser LS1 is applied. In an embodiment, the intensity of the second laser LS2 may be higher than the intensity of the first laser LS1. The second laser LS2 may process the preliminary lower substrate CS-I more deeply than the first laser LS1. For example, the first laser LS1 may process the preliminary lower substrate CS-I to a depth of about 100 micrometers or less, and the second laser LS2 may process the preliminary lower substrate CS-I to a depth of about 100 micrometers or more. Fig. 8A The cross-sectional view of FIG. 1 shows that a plurality of second lasers LS2 are applied between portions on which the first laser LS1 is applied twice. However, the embodiments of the present disclosure are not necessarily limited thereto.

[0114] In an embodiment, the step of applying the second laser LS2 may include the step of focusing the second laser LS2 on the upper portion of the preliminary lower substrate CS-1 and etching a portion of the preliminary lower substrate CS-1. The portion on which the second laser LS2 is applied may be the lower substrate CS (refer to Fig.8D ) pattern part PP (refer to Fig.8D ).

[0115] Although it has been described that the second laser LS2 is applied to the preliminary lower substrate CS-1 after the first laser LS1 is first applied, the embodiments of the present disclosure are not necessarily limited thereto. For example, in some embodiments, the first laser LS1 may be applied after the second laser LS2 is first applied, or the first laser LS1 and the second laser LS2 may be applied simultaneously.

[0116] Reference Figure 8B The method for manufacturing a display device disclosed in the present invention may include: forming a display panel 100 on a preliminary lower substrate CS-1. The first laser LS1 and the second laser LS2 may be completely applied thereon (refer to Fig. 8A ) is performed by forming a base layer BL on a lower substrate CS-I (refer to Figure 3 A circuit layer DP-CL may be formed on the base layer BL (see Figure 3 ), and a display element layer DP-OL may be formed on the circuit layer DP-CL (refer to Figure 3 ). Thereafter, a packaging layer TFE may be formed on the display element layer DP-OL (refer to Figure 3 ) to form the display panel 100. Figure 8B As shown in , the preliminary lower substrate CS-1 and the display panel 100 may be coupled to each other by an adhesive layer 1010.

[0117] In the method of manufacturing a display device in the prior art, the display device is manufactured by removing the preliminary lower substrate CS-I and connecting the panel protection film, the cover panel, and the lower metal plate to the bottom of the display panel 100. However, according to an embodiment of the present disclosure, the preliminary lower substrate CS-I can be used to form a lower member that protects the display panel 100 without removing the preliminary lower substrate CS-I that carries or supports the base layer BL of the display panel 100. Accordingly, the panel protection film, the cover panel, and the lower metal plate in the prior art can be replaced by the preliminary lower substrate. Therefore, the display device manufacturing process can be simplified, and the weight of the display device can be reduced.

[0118] Reference Figure 8C and Fig.8D , the method of manufacturing a display device disclosed in the present invention may include: a step of placing an etching protection film PF; and a step of etching the preliminary lower substrate CS-I to form a spacer portion SP and a pattern portion PP. In an embodiment, the etching protection film PF may be provided on the display panel 100 to protect the display panel 100 before etching of the preliminary lower substrate CS-I.

[0119] Thereafter, the preliminary lower substrate CS-I may be etched from the bottom by the etchant ES. In an embodiment, the etchant ES may include at least one of HF, NaOH, and KOH. However, the embodiments of the present disclosure are not necessarily limited thereto. For example, the preliminary lower substrate CS-I may be etched from the bottom, and the etchant ES may reach the lower surface of the display panel 100 (e.g., the lower surface of the adhesive layer 1010). In this process, the etchant ES may penetrate into the bottom of the preliminary lower substrate CS-I and the portion to which the second laser LS2 is applied, and may etch a portion of the preliminary lower substrate CS-I. A pattern portion PP of the lower substrate CS may be formed from the etched portion.

[0120] The spacing portion SP of the lower substrate CS may overlap the folding area FA of the display panel 100 in a plane (eg, in the third direction DR3). In an embodiment, the spacing portion SP may be an empty space or area. In an embodiment, the height H-SP of the spacing portion SP (refer to Figure 5 ) may be less than or equal to the thickness D-CS of the lower substrate CS (refer to Figure 5 For example, in the embodiment, the height H-SP of the spacer portion SP (refer to Figure 5 ) can be in the range of from about 10 microns to about 100 microns.

[0121] Thereafter, an additional etching process having isotropic characteristics may be performed from the lower surface of the display panel 100 (or the lower surface of the adhesive layer 1010). In the additional etching process, the etchant ES may penetrate into the portion on which the first laser LS1 is applied, and a portion of the preliminary lower substrate CS-1 may be etched. A spacer portion SP of the lower substrate CS may be formed from the etched portion.

[0122] The pattern portion PP of the lower substrate CS may be spaced apart from the display panel 100 by the spacer portion SP in the cross-sectional view. The width W-PP of the pattern portion PP in the first direction DR1 (refer to Figure 5 ) may gradually increase as the distance from the display panel 100 increases. The pattern portion PP may include a plurality of holes HO. The plurality of holes HO may extend in a second direction DR2 intersecting the first direction DR1. The plurality of holes HO may be spaced apart from each other in the first direction DR1 and the second direction DR2. In an embodiment, a pattern angle A0 formed by the holes HO present at opposite ends of the pattern portion PP and a side surface of the pattern portion PP may be about 90 degrees or less. In an embodiment, the etched lower substrate CS may have a thickness in a range of about 30 micrometers to about 300 micrometers.

[0123] The method for manufacturing a display device of the present disclosure may further include: using a resin material RM (refer to Figure 7 ) The step of filling the spacer portion SP. In an embodiment, the resin material RM may include at least one of epoxy resin, urethane, and acrylate. Since the resin material RM fills the spacer portion SP, the tension generated when the display device DD is folded may be reduced, and the folding stability of the display device DD may be increased.

[0124] Fig.9A and Fig. 9B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure. Fig.9A Shown with Fig. 8A The corresponding cross-section diagram, and Fig. 9B Shown with Fig.8D Corresponding cross-sectional diagram. Fig.9A and Fig. 9B When, with reference Figures 2 to 8D Components that are the same or similar to those described will be assigned the same or similar reference numerals, and for economy of description, repeated descriptions may be omitted.

[0125] Reference Fig.9A , the method for manufacturing a display device disclosed in the present invention may include: a step of preparing a preliminary lower substrate CSa-I; a step of applying a first laser LS1a; and a step of applying a second laser LS2.

[0126] The preliminary lower substrate CSa-I may include a first area AR1, a second area AR2, and a third area AR3. The second area AR2 may be spaced apart from the first area AR1 in the first direction DR1, and the third area AR3 may be defined between the first area AR1 and the second area AR2 (e.g., in the first direction DR1). For example, the first area AR1, the third area AR3, and the second area AR2 of the preliminary lower substrate CSa-I may be continuously arranged in the first direction DR1. In an embodiment, the preliminary lower substrate CSa-I may have a thickness in the range of about 100 microns to about 500 microns.

[0127] The first laser device LSD1 may apply the first laser LS1a along the boundary between the first area AR1 and the third area AR3 and the boundary between the second area AR2 and the third area AR3. In an embodiment, the step of applying the first laser LS1a may include the step of focusing the first laser LS1a on the middle portion of the preliminary lower substrate CSa-I and etching a portion of the preliminary lower substrate CSa-I. The portion to which the first laser LS1a is applied may be the lower substrate CSa (refer to Fig. 9B ) of the interval part SPa (refer to Fig. 9B ).

[0128] Thereafter, the second laser device LSD2 may apply the second laser LS2 between the portions on which the first laser LS1a is applied. In an embodiment, the intensity of the second laser LS2 may be higher than the intensity of the first laser LS1a. The second laser LS2 may process the preliminary lower substrate CSa-I more deeply than the first laser LS1a. For example, in an embodiment, the first laser LS1a may process the preliminary lower substrate CSa-I to a depth of about 100 micrometers or less, and the second laser LS2 may process the preliminary lower substrate CSa-I to a depth of about 100 micrometers or more.

[0129] In an embodiment, the step of applying the second laser LS2 may include the step of focusing the second laser LS2 on the upper portion of the preliminary lower substrate CSa-I and etching a portion of the preliminary lower substrate CSa-I. The portion on which the second laser LS2 is applied may be the lower substrate CSa (refer to Fig. 9B ) pattern part PPa (refer to Fig. 9B ).

[0130] Although it has been described that the second laser LS2 is applied to the preliminary lower substrate CSa-I after the first laser LS1a is first applied, the embodiments of the present disclosure are not necessarily limited thereto. For example, in an embodiment, the first laser LS1a may be applied after the second laser LS2 is first applied, or the first laser LS1a and the second laser LS2 may be applied simultaneously. The step of forming the display panel 100 on the preliminary lower substrate CSa-I and placing the etching protection film PF (refer to Figure 8C) can be followed by Figure 8B and Figure 8C The process described is essentially the same.

[0131] Reference Fig. 9B , the method of manufacturing a display device according to an embodiment of the present disclosure may include a step of forming a spacer portion SPa and a pattern portion PPa by etching a preliminary lower substrate CSa-I.

[0132] Can be etched by ES (ref. Figure 8C ) The preliminary lower substrate CSa-I is etched from the bottom. In an embodiment, the etchant ES may include at least one of HF, NaOH, and KOH. However, the embodiments of the present disclosure are not necessarily limited thereto. The etchant ES may penetrate into the bottom of the preliminary lower substrate CSa-I and the portion to which the second laser LS2 is applied, and may etch a portion of the preliminary lower substrate CSa-I. A pattern portion PPa of the lower substrate CSa may be formed from the etched portion.

[0133] Thereafter, an additional etching process having isotropic characteristics may be performed from the lower surface of the display panel 100 (e.g., the lower surface of the adhesive layer 1010). In the additional etching process, the etchant ES may penetrate into the portion on which the first laser LS1a is applied, and a portion of the preliminary lower substrate CSa-I may be etched. A spacer portion SPa of the lower substrate CSa may be formed from the etched portion.

[0134] In an embodiment, the etched lower substrate CSa may have a thickness in a range of about 30 micrometers to about 300 micrometers. The spacer portion SPa of the lower substrate CSa may overlap with the folding area FA of the display panel 100 in a plane (e.g., in the third direction DR3). In an embodiment, the spacer portion SPa may be an empty space or area. The pattern portion PPa of the lower substrate CSa may be spaced apart from the display panel 100 by the spacer portion SPa (e.g., in the third direction DR3) in a cross-sectional view. The pattern portion PPa may include a plurality of holes HO. Fig. 9B The pattern part PPa can be Fig.8D The pattern portions PP are substantially the same.

[0135] Fig. 9B The shape of the spacer portion SPa can be Fig.8D The shapes of the spacer parts SP are different. For example, Fig. 9B The interval part SPa can be Fig.8D The space portion SP also includes a portion NF on which the first laser LS1a is not focused and etched by the first laser LS1a. Fig. 9BThe spacing portion SPa may include a portion FF on which the first laser LS1a is applied while being focused on the middle portion, and a portion NF on which the first laser LS1a is not focused and etched by the first laser LS1a. The width of the portion FF in the first direction DR1 may be greater than the width of the portion NF in the first direction DR1.

[0136] The method for manufacturing a display device according to an embodiment of the present disclosure may further include: using a resin material RM (refer to Figure 7 ) The step of filling the spacer portion SPa. In an embodiment, the resin material RM may include at least one of epoxy resin, urethane, and acrylate. Since the resin material RM fills the spacer portion SPa, the tension generated when the display device DD is folded can be reduced, and the folding stability of the display device DD can be increased.

[0137] Fig. 10A and Fig. 10B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure. Fig. 10A Shown with Fig. 8A The corresponding cross-section diagram, and Fig. 10B Shown with Fig.8D Corresponding cross-sectional diagram. Fig. 10A and Fig. 10B When, with reference Figures 2 to 8D Components that are the same or similar to those described will be assigned the same or similar reference numerals, and for economy of description, repeated descriptions may be omitted.

[0138] Reference Fig. 10A , the method for manufacturing a display device disclosed in the present invention may include: a step of preparing a preliminary lower substrate CSb-I; a step of applying a first laser LS1; and a step of applying a second laser LS2a.

[0139] In an embodiment, the preliminary lower substrate CSb-I may include a first area AR1, a second area AR2, and a third area AR3. The second area AR2 may be spaced apart from the first area AR1 in the first direction DR1, and the third area AR3 may be defined between the first area AR1 and the second area AR2 (e.g., in the first direction DR1). For example, the first area AR1, the third area AR3, and the second area AR2 of the preliminary lower substrate CSb-I may be continuously arranged in the first direction DR1. In an embodiment, the preliminary lower substrate CSb-I may have a thickness in a range of about 100 microns to about 500 microns.

[0140] The first laser device LSD1 may apply the first laser LS1 along a boundary between the first area AR1 and the third area AR3 and a boundary between the second area AR2 and the third area AR3. In an embodiment, the step of applying the first laser LS1 may include the step of focusing the first laser LS1 on an upper portion of the preliminary lower substrate CSb-I and etching a portion of the preliminary lower substrate CSb-I. The portion on which the first laser LS1 is applied may be the lower substrate CSb (refer to Fig. 10B ) of the interval part SPb (refer to Fig. 10B ).

[0141] Thereafter, the second laser device LSD2 may apply the second laser LS2a between the portions on which the first laser LS1 is applied. In an embodiment, the intensity of the second laser LS2a may be higher than the intensity of the first laser LS1. The second laser LS2a may process the preliminary lower substrate CSb-I more deeply than the first laser LS1. For example, in an embodiment, the first laser LS1 may process the preliminary lower substrate CSb-I to a depth of about 100 micrometers or less, and the second laser LS2a may process the preliminary lower substrate CSb-I to a depth of about 100 micrometers or more.

[0142] In an embodiment, the step of applying the second laser LS2a may include the step of focusing the second laser LS2a on the middle portion of the preliminary lower substrate CSb-I and etching a portion of the preliminary lower substrate CSb-I. The portion to which the second laser LS2a is applied may be the lower substrate CSb (refer to Fig. 10B ) pattern part PPb (refer to Fig. 10B ).

[0143] Although it has been described that the second laser LS2a is applied to the preliminary lower substrate CSb-I after the first laser LS1 is first applied, the embodiments of the present disclosure are not necessarily limited thereto. For example, in an embodiment, the first laser LS1 may be applied after the second laser LS2a is first applied, or the first laser LS1 and the second laser LS2a may be applied simultaneously. The step of forming the display panel 100 on the preliminary lower substrate CSb-I and placing the etching protection film PF (refer to Figure 8C ) can be followed by Figure 8B and Figure 8C The process described is essentially the same.

[0144] Reference Fig. 10B , the method of manufacturing a display device according to an embodiment of the present disclosure may include the step of forming a spacer portion SPb and a pattern portion PPb by etching a preliminary lower substrate CSb-I.

[0145] Can be etched by ES (ref. Figure 8C) The preliminary lower substrate CSb-I is etched from the bottom. In an embodiment, the etchant ES may include at least one of HF, NaOH, and KOH. However, the embodiments of the present disclosure are not necessarily limited thereto. The etchant ES may penetrate into the bottom of the preliminary lower substrate CSb-I and the portion to which the second laser LS2a is applied, and may etch a portion of the preliminary lower substrate CSb-I. A pattern portion PPb of the lower substrate CSb may be formed from the etched portion.

[0146] Thereafter, an additional etching process having isotropic characteristics may be performed from the lower surface of the display panel 100 (e.g., the lower surface of the adhesive layer 1010). In the additional etching process, the etchant ES may penetrate into the portion on which the first laser LS1 is applied, and a portion of the preliminary lower substrate CSb-1 may be etched. A spacer portion SPb of the lower substrate CSb may be formed from the etched portion.

[0147] In an embodiment, the etched lower substrate CSb may have a thickness in the range of about 30 microns to about 300 microns. The spacer portion SPb of the lower substrate CSb may overlap with the folding area FA of the display panel 100 in a plane (for example, in the third direction DR3). In an embodiment, the spacer portion SPb may be an empty space or area. In the cross-sectional view, the pattern portion PPb of the lower substrate CSb may be spaced apart from the display panel 100 by the spacer portion SPb. The pattern portion PPb may include a plurality of holes HO. The angle formed by the holes HO present at the opposite ends of the pattern portion PPb and the side surface of the pattern portion PPb may be defined as a first pattern angle A1. In an embodiment, the first pattern angle A1 may be about 90 degrees or less. For example, in an embodiment, the first pattern angle A1 may be about 60 degrees or less. Fig. 10B The first pattern angle A1 may be less than Fig.8D The pattern angle A0.

[0148] Fig.11A and Fig. 11B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure. Fig.11A Shown with Fig. 8A The corresponding cross-section diagram, and Fig. 11B Shown with Fig.8D Corresponding cross-sectional diagram. Fig.11A and Fig. 11B When, with reference Figures 2 to 8D Components that are the same or similar to those described will be assigned the same or similar reference numerals, and for economy of description, repeated descriptions may be omitted.

[0149] Reference Fig.11A, the method for manufacturing a display device according to an embodiment of the present disclosure may include: a step of preparing a preliminary lower substrate CSc-I; a step of applying a first laser LS1; and a step of applying a second laser LS2b.

[0150] In an embodiment, the preliminary lower substrate CSc-I may include a first area AR1, a second area AR2, and a third area AR3. The second area AR2 may be spaced apart from the first area AR1 in the first direction DR1, and the third area AR3 may be defined between the first area AR1 and the second area AR2 (e.g., in the first direction DR1). For example, the first area AR1, the third area AR3, and the second area AR2 of the preliminary lower substrate CSc-I may be continuously arranged in the first direction DR1. In an embodiment, the preliminary lower substrate CSc-I may have a thickness in the range of about 100 microns to about 500 microns.

[0151] The first laser device LSD1 may apply the first laser LS1 along the boundary between the first area AR1 and the third area AR3 and the boundary between the second area AR2 and the third area AR3. In an embodiment, the step of applying the first laser LS1 may include the step of focusing the first laser LS1 on the upper portion of the preliminary lower substrate CSc-I and etching a portion of the preliminary lower substrate CSc-I. The portion on which the first laser LS1 is applied may be the lower substrate CSc (refer to Fig. 11B ) of the spacer portion SPc (refer to Fig. 11B ).

[0152] Thereafter, the second laser device LSD2 may apply the second laser LS2b between the portions on which the first laser LS1 is applied. In an embodiment, the intensity of the second laser LS2b may be higher than the intensity of the first laser LS1. The second laser LS2b may process the preliminary lower substrate CSc-I more deeply than the first laser LS1. For example, in an embodiment, the first laser LS1 may process the preliminary lower substrate CSc-I to a depth of about 100 micrometers or less, and the second laser LS2b may process the preliminary lower substrate CSc-I to a depth of about 100 micrometers or more.

[0153] In an embodiment, the step of applying the second laser LS2b may include the step of focusing the second laser LS2b on the lower portion of the preliminary lower substrate CSc-I and etching a portion of the preliminary lower substrate CSc-I. The portion to which the second laser LS2b is applied may be the lower substrate CSc (refer to Fig. 11B ) pattern part PPc (refer to Fig. 11B ).

[0154] Although it has been described that the second laser LS2b is applied to the preliminary lower substrate CSc-I after the first laser LS1 is first applied, the embodiments of the present disclosure are not necessarily limited thereto. For example, in an embodiment, the first laser LS1 may be applied after the second laser LS2b is first applied, or the first laser LS1 and the second laser LS2b may be applied simultaneously. The step of forming the display panel 100 on the preliminary lower substrate CSc-I and placing the etching protection film PF (refer to Figure 8C ) can be followed by Figure 8B and Figure 8C The process described is essentially the same.

[0155] Reference Fig. 11B , the method of manufacturing a display device disclosed in the present invention may include the step of forming a spacer portion SPc and a pattern portion PPc by etching a preliminary lower substrate CSc-I.

[0156] Can be etched by ES (ref. Figure 8C ) The preliminary lower substrate CSc-I is etched from the bottom. In an embodiment, the etchant ES may include at least one of HF, NaOH and KOH. However, the embodiments of the present disclosure are not necessarily limited thereto. The etchant ES may penetrate into the bottom of the preliminary lower substrate CSc-I and the portion to which the second laser LS2b is applied, and may etch a portion of the preliminary lower substrate CSc-I. A pattern portion PPc of the lower substrate CSc may be formed from the etched portion.

[0157] Thereafter, an additional etching process having isotropic characteristics may be performed from the lower surface of the display panel 100 (e.g., the lower surface of the adhesive layer 1010). In the additional etching process, the etchant ES may penetrate into the portion on which the first laser LS1 is applied, and a portion of the preliminary lower substrate CSc-1 may be etched. A spacer portion SPc of the lower substrate CSc may be formed from the etched portion.

[0158] In an embodiment, the etched lower substrate CSc may have a thickness in the range of about 30 microns to about 300 microns. The spacer portion SPc of the lower substrate CSc may overlap with the folding area FA of the display panel 100 in a plane (for example, in the third direction DR3). In an embodiment, the spacer portion SPc may be an empty space or area. The pattern portion PPc of the lower substrate CSc may be spaced apart from the display panel 100 by the spacer portion SPc in the cross-sectional view. The pattern portion PPc may include a plurality of holes HO. The angle formed by the holes HO present at the opposite ends of the pattern portion PPc and the side surface of the pattern portion PPc may be defined as a second pattern angle A2. In an embodiment, the second pattern angle A2 may be about 90 degrees or less. Fig. 11B The second pattern angle A2 may be less than Fig.8D The pattern angle A0, and the second pattern angle A2 may be less than Fig. 10BThe first pattern angle A1.

[0159] Fig. 12A and Fig. 12B are cross-sectional views illustrating some steps of a method of manufacturing a display device according to an embodiment of the present disclosure. Fig. 12A Shown with Fig. 8A The corresponding cross-section diagram, and Fig. 12B Shown with Fig.8D Corresponding cross-sectional diagram. Fig. 12A and Fig. 12B When, with reference Figures 2 to 8D Components that are the same or similar to those described will be assigned the same or similar reference numerals, and for economy of description, repeated descriptions may be omitted.

[0160] Reference Fig. 12A , the method for manufacturing a display device disclosed in the present invention may include: a step of preparing a preliminary lower substrate CSd-I; a step of applying a first laser LS1; and a step of applying a second laser LS2c.

[0161] In an embodiment, the preliminary lower substrate CSd-I may include a first area AR1, a second area AR2, and a third area AR3. The second area AR2 may be spaced apart from the first area AR1 in the first direction DR1, and the third area AR3 may be defined between the first area AR1 and the second area AR2 (e.g., in the first direction DR1). For example, the first area AR1, the third area AR3, and the second area AR2 of the preliminary lower substrate CSd-I may be continuously arranged in the first direction DR1. In an embodiment, the preliminary lower substrate CSd-I may have a thickness in a range of about 100 micrometers to about 500 micrometers.

[0162] The first laser device LSD1 may apply the first laser LS1 along a boundary between the first area AR1 and the third area AR3 and a boundary between the second area AR2 and the third area AR3. In an embodiment, the step of applying the first laser LS1 may include the step of focusing the first laser LS1 on an upper portion of the preliminary lower substrate CSd-I and etching a portion of the preliminary lower substrate CSd-I. The portion to which the first laser LS1 is applied may be the lower substrate CSd (refer to Fig. 12B ) of the interval SPd (refer to Fig. 12B ).

[0163] Thereafter, the second laser device LSD2 may apply the second laser LS2c between the portions on which the first laser LS1 is applied. In an embodiment, the intensity of the second laser LS2c may be higher than the intensity of the first laser LS1. The second laser LS2c may process the preliminary lower substrate CSd-I more deeply than the first laser LS1. For example, in an embodiment, the first laser LS1 may process the preliminary lower substrate CSd-I to a depth of about 100 micrometers or less, and the second laser LS2c may process the preliminary lower substrate CSd-I to a depth of about 100 micrometers or more.

[0164] In an embodiment, the step of applying the second laser LS2c may include the step of focusing the second laser LS2c on the upper portion, the middle portion, and the lower portion of the preliminary lower substrate CSd-I and etching a portion of the preliminary lower substrate CSd-I. The portion to which the second laser LS2c is applied may be the lower substrate CSd (refer to Fig. 12B ) pattern part PPd (refer to Fig. 12B ).

[0165] Although it has been described that the second laser LS2c is applied to the preliminary lower substrate CSd-I after the first laser LS1 is first applied, the embodiments of the present disclosure are not necessarily limited thereto. For example, the first laser LS1 may be applied after the second laser LS2c is first applied, or the first laser LS1 and the second laser LS2c may be applied simultaneously. The steps of forming the display panel 100 on the preliminary lower substrate CSd-I and placing the etching protection film PF (refer to Figure 8C ) can be followed by Figure 8B and Figure 8C The process described is essentially the same.

[0166] Reference Fig. 12B , the method of manufacturing a display device according to an embodiment of the present disclosure may include the step of forming a spacer portion SPd and a pattern portion PPd by etching a preliminary lower substrate CSd-I.

[0167] Can be etched by ES (ref. Figure 8C ) The preliminary lower substrate CSd-I is etched from the bottom. In an embodiment, the etchant ES may include at least one of HF, NaOH, and KOH. However, the embodiments of the present disclosure are not necessarily limited thereto. The etchant ES may penetrate into the bottom of the preliminary lower substrate CSd-I and the portion to which the second laser LS2c is applied, and may etch a portion of the preliminary lower substrate CSd-I. A pattern portion PPd of the lower substrate CSd may be formed from the etched portion.

[0168] Thereafter, an additional etching process having isotropic characteristics may be performed from the lower surface of the display panel 100 (e.g., the lower surface of the adhesive layer 1010). In the additional etching process, the etchant ES may penetrate into the portion on which the first laser LS1 is applied, and a portion of the preliminary lower substrate CSd-1 may be etched. A spacer portion SPd of the lower substrate CSd may be formed from the etched portion.

[0169] In an embodiment, the etched lower substrate CSd may have a thickness in a range of about 30 microns to about 300 microns. The spacer portion SPd of the lower substrate CSd may overlap with the folding area FA of the display panel 100 in a plane (e.g., in the third direction DR3). In an embodiment, the spacer portion SPd may be an empty space or area. The pattern portion PPd of the lower substrate CSd may be spaced apart from the display panel 100 by the spacer portion SPd in ​​a cross-sectional view. The pattern portion PPd may include a plurality of holes HO. The angle formed by the holes HO present at the opposite ends of the pattern portion PPd and the side surface of the pattern portion PPd may be defined as a third pattern angle A3. In an embodiment, the third pattern angle A3 may be about 90 degrees or less. Fig. 12B The third pattern angle A3 may be less than Fig. 10B The first pattern angle A1 and may be greater than Fig. 11B The second pattern angle A2. For example, in the embodiment, Fig. 12B The third pattern angle A3 may be about 45 degrees.

[0170] As described above, the lower substrate of the display device of the present disclosure may include a spacer portion. Accordingly, the tensile stress generated in the pattern portion when the display device is folded may not be transmitted to the display panel. Therefore, the separation between the display panel and the lower substrate may be reduced or eliminated. In addition, in an embodiment of the present disclosure, the spacer portion may be filled with a resin material. Accordingly, the tension generated when the display device is folded may be reduced, and the folding stability of the display device may be increased.

[0171] In addition, in the method for manufacturing a display device disclosed in the present invention, a preliminary lower substrate can be used to form a lower member for protecting a display panel without removing the preliminary lower substrate for a base layer that carries or supports the display panel. Accordingly, the panel protective film, cover panel, and lower metal plate in the prior art can be replaced by the preliminary lower substrate. Therefore, the manufacturing process of the display device can be simplified, and the weight of the display device can be reduced.

[0172] Although the present disclosure has been described with reference to non-limiting embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the present disclosure.

Claims

1. A display device, comprising: A display panel having a first non-folding area, a folding area, and a second non-folding area continuously arranged in a first direction, wherein the folding area is adjacent to the first non-folding area and the second non-folding area and is foldable around a folding axis; and a lower substrate, the lower substrate being arranged below the display panel, The lower substrate includes a spacer portion and a pattern portion, the spacer portion overlaps with the folding area on a plane, and the pattern portion is separated from the display panel by the spacer portion in a thickness direction of the display device, and the pattern portion includes a plurality of holes.

2. The display device according to claim 1, wherein: The width of the pattern portion in the first direction increases with increasing distance from the display panel in the thickness direction of the display device.

3. The display device according to claim 1, wherein: The lower substrate includes a first region overlapping the first non-folding region, a second region overlapping the second non-folding region, and a third region overlapping the folding region, the third region including the spacer portion and the pattern portion, and The first region, the second region and the third region include the same material.

4. The display device according to claim 1, wherein: The lower substrate is a glass substrate.

5. The display device according to claim 1, wherein: The spacing portion has a height less than or equal to one third of a thickness of the lower substrate.

6. The display device according to claim 1, wherein: The spacer portion has a height in the range of 10 micrometers to 100 micrometers.

7. The display device according to claim 1, wherein: The spacing portion has a width in the first direction greater than a width of the folding region in the first direction.

8. The display device according to claim 1, wherein: The space portion has a width in the first direction greater than a width of the pattern portion in the first direction.

9. The display device according to claim 1, further comprising: A resin material fills the space portion.

10. The display device according to claim 1, wherein: The plurality of holes extend in a second direction intersecting the first direction, the plurality of holes including a first hole group and a second hole group spaced apart from each other in the first direction; as well as The first hole group and the second hole group are staggered with each other.

11. A method for manufacturing a display device, the method comprising: preparing a preliminary lower substrate including a first region, a second region spaced apart from the first region in a first direction, and a third region defined between the first region and the second region; applying a first laser along a boundary of the third zone; applying a second laser between the portions to which the first laser is applied; forming a display panel on the preliminary lower substrate; as well as A spacer portion and a pattern portion are formed by etching the preliminary lower substrate, wherein the pattern portion is spaced apart from the display panel by the spacer portion in a thickness direction of the display device, and the pattern portion includes a plurality of holes.

12. The method for manufacturing a display device according to claim 11, further comprising: An etching protection film is placed on the display panel.

13. The method for manufacturing a display device according to claim 11, further comprising: The spaced portion is filled with a resin material.

14. The method for manufacturing a display device according to claim 11, wherein: The second laser light has an intensity higher than that of the first laser light.

15. The method for manufacturing a display device according to claim 11, wherein: Applying the first laser comprises: The first laser is focused on an upper portion of the preliminary lower substrate and etches a portion of the preliminary lower substrate.

16. The method for manufacturing a display device according to claim 11, wherein: Applying the first laser comprises: The first laser is focused on a middle portion of the preliminary lower substrate and etches a portion of the preliminary lower substrate.

17. The method for manufacturing a display device according to claim 11, wherein: Applying the second laser comprises: The second laser is focused on an upper portion of the preliminary lower substrate and etches a portion of the preliminary lower substrate.

18. The method for manufacturing a display device according to claim 11, wherein: Applying the second laser comprises: The second laser is focused on a middle portion of the preliminary lower substrate and etches a portion of the preliminary lower substrate.

19. The method for manufacturing a display device according to claim 11, wherein: Applying the second laser comprises: The second laser is focused on a lower portion of the preliminary lower substrate and etches a portion of the preliminary lower substrate.

20. The method for manufacturing a display device according to claim 11, wherein: Applying the second laser comprises: The second laser is focused on an upper portion, a middle portion, and a lower portion of the preliminary lower substrate and etches a portion of the preliminary lower substrate.

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