Display device, electronic device comprising same, and display device manufacturing method

Abstract

A display device according to one embodiment comprises: a display panel including a folding area and a non-folding area; and a panel support member which is disposed on the display panel, and which includes a folding part disposed in the folding area and a non-folding part disposed in the non-folding area, wherein the folding part includes a grid pattern in which a plurality of slits and a plurality of bars are alternately disposed, the panel support member includes a first surface positioned adjacent to the display panel on a cross-section cut in the thickness direction, a second surface opposite the first surface, a first inner surface, which is connected to the first surface inside the slit, is disposed between the first surface and the second surface and includes a curved surface, and a second inner surface disposed between the first inner surface and the second surface inside the slit, the point at which the first surface and the first inner surface meet being defined as a first point, the point at which the second surface and the second inner surface meet being defined as a second point, and the point at which the first inner surface and the second inner surface meet being defined as a third point.

Description

A display device, an electronic device including the same, and a method for manufacturing a display device

[0001] The present invention relates to a display device, an electronic device including the same, and a method for manufacturing a display device.

[0002] As the information society develops, the demand for display devices for displaying images is increasing in various forms. Display devices may be liquid crystal displays, field emission displays, light-emitting displays, etc. Light-emitting displays may include organic light-emitting displays that include organic light-emitting diode elements as light-emitting elements, or inorganic light-emitting displays that include inorganic light-emitting diode elements as light-emitting elements.

[0003] Recently, bendable display devices with a display area that can be bent or foldable display devices with a display area that can be folded are being released to enhance the portability of display devices while simultaneously providing a large display screen.

[0004] The problem that the present invention aims to solve is to provide a display device with improved flexibility and durability, an electronic device including the same, and a method for manufacturing the display device.

[0005] The problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below.

[0006] A display device according to an embodiment for solving the above problem comprises a display panel including a folding area and a non-folding area, and a panel support member disposed on the display panel and including a folding portion disposed in the folding area and a non-folding portion disposed in the non-folding area, wherein the folding portion includes a grid pattern in which a plurality of slits and a plurality of bars are alternately arranged, and the panel support member includes, on a cross-section cut in the thickness direction, a first surface located adjacent to the display panel, a second surface facing the first surface, a first inner surface connected to the first surface inside the slit and disposed between the first surface and the second surface and including a curved surface, and a second inner surface disposed between the first inner surface and the second surface inside the slit, wherein the point where the first surface and the first inner surface meet is defined as a first point, the point where the second surface and the second inner surface meet is defined as a second point, and the point where the first inner surface and the second inner surface meet is defined as a third point. The slit has a first width in a direction parallel to the first surface at the first point, a second width in a direction parallel to the second surface at the second point, and a third width, which is the minimum width, in a direction parallel to at least one of the first surface and the second surface at the third point, wherein the third width is smaller than the first width and the first width is smaller than the second width, and a first reference point is defined where a straight line extending in a horizontal direction perpendicular to the thickness direction meets the first inner surface at a point located at a first vertical distance in the thickness direction from the first point, and when the first vertical distance is 0.5 μm, the first angle formed by the first tangent line touching the first inner surface at the first reference point with the first surface is 15 degrees or more and 30 degrees or less.

[0007] The distance between the first reference point and the first point in the above horizontal direction is defined as the first horizontal distance, and the first horizontal distance may be 2 to 4 times the first vertical distance.

[0008] A second reference point is defined at a point located at a distance of a second vertical distance in the thickness direction from the second point, where a straight line extending in the horizontal direction meets the second inner surface, and the second angle formed by the second tangent line touching the second inner surface at the second reference point with the second surface is greater than the first angle, and the second vertical distance may be the same as the first vertical distance.

[0009] A first contact point adjacent to the first point and a second contact point adjacent to the third point are defined on the first inner surface, and the distance between the first point and the first contact point on the first inner surface is the same as the distance between the third point and the second contact point on the first inner surface, and the first radius of the first inscribed circle inscribed in the first inner surface at the first contact point may be larger than the second radius of the second inscribed circle inscribed in the first inner surface at the second contact point.

[0010] Any third contact point located on the second inner surface is defined, and the third radius of the third inscribed circle inscribed on the second inner surface at the third contact point may be larger than the first radius and the second radius.

[0011] The distance at which the third point is spaced from the first surface in the thickness direction may be greater than 0.2 times and less than 0.4 times the thickness of the panel support member.

[0012] The thickness of the above panel support member may be 80㎛ to 150㎛.

[0013] The first width may be 20㎛ to 80㎛, the second width may be 40㎛ to 150㎛, and the third width may be 10㎛ to 40㎛.

[0014] The second inner surface may include a curved surface adjacent to the first inner surface and a flat surface adjacent to the second surface.

[0015] The above panel support member may include glass.

[0016] It may further include a filling member comprising a first portion disposed inside the slit and a second portion disposed overlapping the folding portion on the second surface.

[0017] The above-mentioned filling member may further include a third part disposed overlapping the non-folding part on the second surface and a fourth part disposed on the side of the panel support member.

[0018] A display device according to another embodiment for solving the above problem comprises a display panel including a folding area and a non-folding area, and a panel support member disposed on the display panel and including a folding portion disposed in the folding area and a non-folding portion disposed in the non-folding area, wherein the folding portion includes a grid pattern in which a plurality of slits and a plurality of bars are alternately arranged, and the panel support member includes, on a cross-section cut in the thickness direction, a first surface located adjacent to the display panel, a second surface facing the first surface, a first inner surface connected to the first surface inside the slit and disposed between the first surface and the second surface and including a curved surface, and a second inner surface disposed between the first inner surface and the second surface inside the slit, wherein the point where the first surface and the first inner surface meet is defined as a first point, the point where the second surface and the second inner surface meet is defined as a second point, and the point where the first inner surface and the second inner surface meet is defined as a third point. The slit has a first width in a direction parallel to the first surface at the first point, a second width in a direction parallel to the second surface at the second point, and a third width which is a minimum width in a direction parallel to at least one of the first surface and the second surface at the third point, the third width is smaller than the first width, the first width is smaller than the second width, and the panel support member may have a shape optimization index Ω defined by the following mathematical formula 1 of 0.35 or higher.

[0019] [Mathematical Formula 1]

[0020]

[0021] Here, w1 represents the first width, w3 represents the third width, and D represents the distance at which the third point is spaced from the first surface in the thickness direction.

[0022] The above w3 may be 10㎛ to 40㎛, the above w1 may be 20㎛ to 80㎛, and the above D may be 20㎛ to 50㎛.

[0023] A method for manufacturing a display device according to one embodiment for solving the above problem comprises the steps of: irradiating a glass plate with a laser to form a sketch line; contacting a first etching solution with at least one surface of the glass plate on which the sketch line is formed to form a slit in an area corresponding to the sketch line; immersing the glass plate on which the slit is formed in a second etching solution to perform a first healing step; immersing the glass plate that has been performed a first healing step in a molten salt to perform a chemical strengthening step; immersing the chemically strengthened glass plate in a third etching solution to perform a second healing step; and filling the slit of the glass plate that has been performed a second healing step with resin.

[0024] The etching rate of the glass plate by the second etching solution may be slower than the etching rate of the glass plate by the first etching solution.

[0025] The second etching solution and the third etching solution may contain the same material.

[0026] The first etching solution and the second etching solution each contain ammonium ions and heavy fluoride ions, and the ratio of ammonium ions to total ions in the first etching solution is smaller than the ratio of ammonium ions to total ions in the second etching solution, and the ratio of heavy fluoride ions to total ions in the first etching solution may be larger than the ratio of heavy fluoride ions to total ions in the second etching solution.

[0027] The above slit includes a first portion adjacent to the upper surface of the glass plate, a second portion adjacent to the lower surface of the glass plate, and a third portion disposed between the first portion and the second portion in the thickness direction of the glass plate, wherein the width of the third portion is smaller than the width of the first portion and the width of the first portion may be smaller than the width of the second portion.

[0028] An electronic device according to an embodiment for solving the above problem comprises a display device for displaying an image, a processor for providing an image driving signal to the display device, and a power module for supplying power to the display device and the processor. The display device comprises a display panel including a folding area and a non-folding area, and a panel support member disposed on the display panel, comprising a folding portion disposed in the folding area and a non-folding portion disposed in the non-folding area. The folding portion comprises a grid pattern in which a plurality of slits and a plurality of bars are alternately arranged. The panel support member comprises, on a cross-section cut in the thickness direction, a first surface located adjacent to the display panel, a second surface facing the first surface, a first inner surface connected to the first surface within the slit and disposed between the first surface and the second surface and comprising a curved surface, and a second inner surface disposed between the first inner surface and the second surface within the slit. The point where the first surface and the first inner surface meet is defined as a first point, and the point where the second surface and the second inner surface meet A point is defined as a second point, and the point where the first inner surface and the second inner surface meet is defined as a third point, and the slit has a first width in a direction parallel to the first surface at the first point, a second width in a direction parallel to the second surface at the second point, and a third width which is a minimum width in a direction parallel to at least one of the first surface and the second surface at the third point, wherein the third width is smaller than the first width, and the first width is smaller than the second width, and a first reference point is defined where a straight line extending in a horizontal direction perpendicular to the thickness direction meets the first inner surface at a point located at a first vertical distance in the thickness direction from the first point, and the first vertical distance is 0.When it is 5㎛, the first angle formed by the first tangent line touching the first inner surface at the first reference point with the first surface is 15 degrees or more and 30 degrees or less.

[0029] According to a display device according to one embodiment of the present invention, an electronic device including the same, and a method for manufacturing a display device, flexibility and durability can be improved.

[0030] The effects according to the embodiments are not limited to those exemplified above, and a wider variety of effects are included in this specification.

[0031] FIG. 1 is a perspective view showing a display device according to one embodiment in an unfolded state.

[0032] FIG. 2 is a perspective view showing a folded state of a display device according to one embodiment.

[0033] FIG. 3 is a perspective view showing an unfolded state of a display device according to another embodiment.

[0034] FIG. 4 is a perspective view showing a folded state of a display device according to another embodiment.

[0035] FIG. 5 is a cross-sectional view showing an example of a display device according to embodiments.

[0036] FIG. 6 is a cross-sectional view showing another example of a display device according to embodiments.

[0037] FIG. 7 is a cross-sectional view showing an example of a display panel according to embodiments.

[0038] FIG. 8 is a plan view of a panel support member according to embodiments.

[0039] Figure 9 is a cross-sectional view taken along X1-X1' of Figure 8.

[0040] Figure 10 is an enlarged view of area A of Figure 9.

[0041] Figures 11 and 12 are enlarged views of the AA area of ​​Figure 9.

[0042] Figure 13 is an enlarged view of the AB region of Figure 10.

[0043] FIG. 14 is an enlarged view showing area A of a panel support member according to another embodiment.

[0044] FIG. 15 is a cross-sectional view showing a ball drop test performed on a laminated structure of a display panel and a panel support member according to the embodiments.

[0045] FIG. 16 is a flowchart illustrating a method for manufacturing a display device according to embodiments.

[0046] FIG. 17 is a cross-sectional view showing step S100 of FIG. 16.

[0047] FIGS. 18 and FIGS. 19 are cross-sectional views showing step S200 of FIG. 16.

[0048] FIG. 20 is a cross-sectional view showing step S300 of FIG. 16.

[0049] FIG. 21 is a cross-sectional view showing step S400 of FIG. 16.

[0050] FIG. 22 is a cross-sectional view showing step S500 of FIG. 16.

[0051] FIGS. 23 to 26 are cross-sectional views showing step S600 of FIG. 16.

[0052] FIG. 27 is a block diagram of an electronic device according to one embodiment.

[0053] FIG. 28 is a schematic diagram of an electronic device according to various embodiments.

[0054] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0055] When an element or layer is referred to as being "on" another element or layer, it includes cases where another layer or element is interposed directly above or in between. Likewise, when referred to as "below," "left," and "right," it includes cases where they are interposed immediately adjacent to another element or where another layer or material is interposed in between. Throughout the specification, the same reference numerals refer to the same components.

[0056] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be the second component within the technical scope of the present invention.

[0057] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship.

[0058] Specific embodiments will be described below with reference to the attached drawings.

[0059] FIG. 1 is a perspective view showing a display device according to one embodiment in an unfolded state. FIG. 2 is a perspective view showing a display device according to one embodiment in a folded state.

[0060] Referring to FIGS. 1 and FIGS. 2, FIGS. 1 shows a first state of a display device (10) unfolded without being folded at the folding lines (FL1, FL2), and FIGS. 2 shows a second state of a display device (10) folded at the folding lines (FL1, FL2).

[0061] A display device (10) according to one embodiment is a device for displaying video or still images, and can be used as a display screen for various products such as televisions, laptops, monitors, billboards, and the Internet of Things (IOT), as well as portable electronic devices such as mobile phones, smartphones, tablet PCs, smart watches, watch phones, mobile communication terminals, electronic notebooks, electronic books, PMPs (portable multimedia players), navigation systems, and UMPCs (Ultra Mobile PCs).

[0062] In the illustrated drawing, the first direction (DR1) and the second direction (DR2) each intersect each other as horizontal directions. For example, the first direction (DR1) and the second direction (DR2) may be mutually orthogonal. Additionally, the third direction (DR3) intersects the first direction (DR1) and the second direction (DR2), and may be, for example, an orthogonal vertical direction. Unless otherwise defined, in this specification, the direction indicated by the arrows of the first to third directions (DR1, DR2, DR3) may be referred to as one side, and the opposite direction may be referred to as the other side. Furthermore, in this specification, “up,” “upper side,” “top,” “top,” and “upper surface” refer to the direction in which the arrow of the drawing points among the third direction (DR3) based on the drawing, and “lower,” “lower side,” “lower,” “bottom,” and “lower surface” refer to the direction opposite to the direction in which the arrow of the third direction (DR3) points based on the drawing.

[0063] In the drawing, the first direction (DR1) may be a direction parallel to one side of the display device (10) when viewed on a plane, for example, the horizontal direction of the display device (10). The second direction (DR2) may be a direction parallel to the other side that touches one side of the display device (10) when viewed on a plane, and may be the vertical direction of the display device (10). The third direction (DR3) may be the thickness direction of the display device (10).

[0064] The planar shape of the display device (10) may have a rectangular shape, such as a rectangle. Each of the corners of the display device (10) may have a right-angled planar shape or a rounded planar shape. The front of the display device (10) may include two short sides arranged in a first direction (DR1) and two long sides arranged in a second direction (DR2).

[0065] The display device (10) may include a display area (DA) and a non-display area (NDA). The planar shape of the display area (DA) may follow the shape of the display device (10). For example, if the planar shape of the display device (10) is rectangular, the planar shape of the display area (DA) may also be rectangular.

[0066] The display area (DA) may be an area that displays an image by including a plurality of pixels. The non-display area (NDA) may be an area that does not display an image by not including pixels. The non-display area (NDA) may be positioned around the display area (DA). The non-display area (NDA) may be positioned to surround the display area (DA), but the embodiments of this specification are not limited thereto. The display area (DA) may be partially surrounded by the non-display area (NDA).

[0067] The display device (10) can maintain both a first state in an unfolded state and a second state in a folded state. In one embodiment, the display device (10) can be folded in an in-folding manner so that the display areas (DA) face each other as shown in FIG. 2. In this case, the front surfaces of the display device (10) can face each other when folded. In another embodiment, the display device (10) can be folded in an out-folding manner so that the back surfaces face each other.

[0068] The display device (10) may include a folding area (FDA), a first non-folding area (NFA1), and a second non-folding area (NFA2). The folding area (FDA) is an area where the display device (10) is bent or folded, and the first non-folding area (NFA1) and the second non-folding area (NFA2) may be areas where the display device (10) is not bent or folded. In one embodiment, the first non-folding area (NFA1) and the second non-folding area (NFA2) may be flat areas of the display device (10).

[0069] The first non-folding area (NFA1) may be positioned on one side of the folding area (FDA), for example, on the left. The second non-folding area (NFA2) may be positioned on the other side of the folding area (FDA), for example, on the right. The folding area (FDA) may be an area defined by the first folding line (FL1) and the second folding line (FL2), and may be an area where the display device (10) is bent with a predetermined curvature. The first folding line (FL1) may be the boundary between the folding area (FDA) and the first non-folding area (NFA1), and the second folding line (FL2) may be the boundary between the folding area (FDA) and the second non-folding area (NFA2).

[0070] The first folding line (FL1) and the second folding line (FL2) extend in a second direction (DR2) as shown in FIGS. 1 and 2, and in this case, the display device (10) can be folded with respect to the second direction (DR2). As a result, the length of the first direction (DR1) of the display device (10) can be reduced by approximately half, so that the user can conveniently carry the display device (10).

[0071] The first non-folding area (NFA1) may be positioned on one side of the folding area (FDA), for example, on the left. The second non-folding area (NFA2) may be positioned on the other side of the folding area (FDA), for example, on the right. Here, the left side may refer to one side of the first direction (DR1), and the right side may refer to the other side of the first direction (DR1).

[0072] When the first folding line (FL1) and the second folding line (FL2) are extended in a second direction (DR2) as in FIGS. 1 and 2, the length of the second direction (DR2) of the folding area (FDA) may be longer than the length of the first direction (DR1). Additionally, the length of the second direction (DR2) of the first non-folding area (NFA1) may be longer than the length of the first direction (DR1) of the first non-folding area (NFA1). The length of the second direction (DR2) of the second non-folding area (NFA2) may be longer than the length of the first direction (DR1) of the second non-folding area (NFA2).

[0073] Each of the display area (DA) and the non-display area (NDA) may overlap with at least one of the folding area (FDA), the first non-folding area (NFA1), and the second non-folding area (NFA2). FIGS. 1 and 2 illustrate the overlap of the display area (DA) and the non-display area (NDA) with the folding area (FDA), the first non-folding area (NFA1), and the second non-folding area (NFA2), respectively.

[0074] FIG. 3 is a perspective view showing a display device in an unfolded state according to another embodiment. FIG. 4 is a perspective view showing a display device in a folded state according to another embodiment.

[0075] Referring to FIGS. 3 and FIGS. 4 in addition to FIGS. 1 and FIGS. 2, FIG. 3 shows a first state of a display device (10) unfolded without being folded at the folding lines (FL1, FL2), and FIG. 4 shows a second state of a display device (10) folded at the folding lines (FL1, FL2).

[0076] The embodiments of FIGS. 3 and 4 differ from the embodiments of FIGS. 1 and 2 only in that the first folding line (FL1) and the second folding line (FL2) are extended in the first direction (DR1), and the display device (10) is folded in the second direction (DR2), so the length of the display device (10) in the second direction (DR2) is reduced by approximately half. Therefore, descriptions that overlap with the embodiments of FIGS. 1 and 2 are omitted in FIGS. 3 and 4.

[0077] In the first state where the display device (10) is unfolded, the long side of the display device (10) can be extended along the second direction (DR2), and the short side of the display device (10) can be extended along the first direction (DR1).

[0078] The first folding line (FL1) and the second folding line (FL2) can be extended in a first direction (DR1) as shown in FIGS. 3 and 4, and in this case, the display device (10) can be folded with respect to the first direction (DR1).

[0079] The first non-folding area (NFA1) may be positioned on one side of the folding area (FDA), for example, on the lower side. The second non-folding area (NFA2) may be positioned on the other side of the folding area (FDA), for example, on the upper side. Here, the upper side may refer to one side of the second direction (DR2), and the lower side may refer to the other side of the second direction (DR2).

[0080] When the first folding line (FL1) and the second folding line (FL2) are extended in a first direction (DR1) as shown in FIGS. 3 and 4, the length of the first direction (DR1) of the folding area (FDA) may be longer than the length of the second direction (DR2). Additionally, the length of the second direction (DR2) of the first non-folding area (NFA1) may be longer than the length of the first direction (DR1) of the first non-folding area (NFA1). The length of the second direction (DR2) of the second non-folding area (NFA2) may be longer than the length of the first direction (DR1) of the second non-folding area (NFA2).

[0081] FIG. 5 is a cross-sectional view showing one example of a display device according to embodiments. FIG. 6 is a cross-sectional view showing another example of a display device according to embodiments.

[0082] Referring to FIGS. 5 and 6, the display device (10) may include an upper protective member (100), a window member (200), a first adhesive member (300), a display panel (400), a second adhesive member (500), a panel support member (700), a third adhesive member (800), a lower functional member (900), and a filling member (1000).

[0083] The display panel (400) may be a panel that displays an image. The display panel (400) may be an organic light-emitting display panel including an organic light-emitting layer, a quantum dot light-emitting display panel including a quantum dot light-emitting layer, an inorganic light-emitting display panel using an inorganic semiconductor device as a light-emitting element, and a micro light-emitting display panel using a micro light-emitting diode as a light-emitting element. In the following description, the display panel (400) is described mainly as being an organic light-emitting display panel, but is not limited thereto.

[0084] The window member (200) can be attached to the front surface of the display panel (400) by the first adhesive member (300). The window member (200) is made of a transparent material and may be, for example, glass or plastic. For example, the window member (200) may be ultra-thin glass (UTG) with a thickness of 0.1 mm or less, or a transparent polyimide film.

[0085] The first adhesive member (300) may be placed on the back surface of the window member (200). For example, the first adhesive member (300) may be placed between the window member (200) and the display panel (400). The window member (200) and the display panel (400) may be joined to each other through the first adhesive member (300). The first adhesive member (300) may include an adhesive material such as a pressure-sensitive adhesive (PSA) or an optically clear adhesive (OCA). The first adhesive member (300) may include an acrylic adhesive material.

[0086] The upper protective member (100) may be placed on the front surface of the window member (200). The upper protective member (100) may be attached to the front surface of the window member (200). The upper protective member (100) may perform at least one of the functions of preventing shattering, absorbing shock, preventing scratches, preventing fingerprints, and preventing glare of the window member (200).

[0087] In some embodiments, a light-blocking pattern may be formed on the back surface of the upper protective member (100). The light-blocking pattern may be positioned at the edge of the upper protective member (100) or adjacent to the edge. The light-blocking pattern may include a light-blocking material capable of blocking light. For example, the light-blocking pattern may be an inorganic black pigment such as carbon black, an organic black pigment, or an opaque metallic material.

[0088] Although not shown in the drawing, a cover window may be further disposed on the upper protective member (100). The cover window may be a protective film for protecting the display device (10) from external impact. The cover window may be attached to the display device (10) or removed from the display device (10) through an adhesive member. That is, the cover window may be a changeable window. In one embodiment, the cover window may include at least one of flexible polyethylene terephthalate (PET) and thermoplastic polyurethane (TPU), but is not limited thereto.

[0089] The panel support member (700) may be placed on the back surface of the display panel (400). The panel support member (700) may be a rigid member whose shape or volume does not easily change due to external pressure. Since the panel support member (700) is a rigid member whose shape or volume does not easily change due to external pressure, it can support the display panel (400).

[0090] In some embodiments, the panel support member (700) may include a glass material. For example, the panel support member (700) may include ultra-thin glass (UTG) with a thickness of 300 µm or less. Preferably, the thickness of the panel support member (700) may be approximately 80 µm to 150 µm.

[0091] The panel support member (700) may include aluminosilicate glass or sodalime glass so that a chemical strengthening process performed in the manufacturing method (S1) of the display device described below can be performed. In one embodiment, when the panel support member (700) includes aluminosilicate glass, the panel support member (700) may include silicon dioxide (SiO2) in an amount of approximately 60% to 65%, aluminum oxide (Al2O3) in an amount of approximately 15% to 20%, sodium oxide (Na2O) in an amount of approximately 10% to 15%, and magnesium oxide (MgO) in an amount of approximately 2% to 5%. In another embodiment, when the panel support member (700) comprises sodalime glass, the panel support member (700) may comprise silicon dioxide (SiO2) in an amount of approximately 65% ​​to 70%, aluminum oxide (Al2O3) in an amount of approximately 3% to 5%, sodium oxide (Na2O) in an amount of approximately 10% to 15%, and magnesium oxide (MgO) in an amount of approximately 5% to 10%.

[0092] The panel support member (700) may include a grid pattern placed in the folding area (FDA) so that it can be easily bent in the folding area (FDA). By including a grid pattern placed in the folding area (FDA), the panel support member (700) can be easily bent when the display device (10) is folded.

[0093] The second adhesive member (500) may be placed on the back surface of the display panel (400). For example, the first adhesive member (300) may be placed between the panel support member (700) and the display panel (400). The panel support member (700) and the display panel (400) may be joined to each other through the second adhesive member (500). The second adhesive member (500) may include an adhesive material such as a pressure-sensitive adhesive (PSA) or an optically clear adhesive (OCA). The second adhesive member (500) may include an acrylic adhesive material.

[0094] The filling member (1000) may be disposed inside the grid pattern of the panel support member (700) and on the lower surface of the panel support member (700). That is, the filling member (1000) may be disposed inside the slit of the grid pattern of the panel support member (700) and between the lower functional member (900) and the panel support member (700). At least a portion of the filling member (1000) may be disposed on the same layer as the third adhesive member (800). At least a portion of the filling member (1000) may be disposed between the third-1 adhesive member (810) and the third-2 adhesive member (820).

[0095] The filling member (1000) can prevent foreign substances from penetrating into the grid pattern and damaging the display panel (400). The filling member (1000) may include a material having flexibility and elasticity to reduce folding stress of the display device (10). For example, the filling member (1000) may include resin.

[0096] In some embodiments, as illustrated in FIG. 5, the filling member (1000) may include a first portion (1000a) and a second portion (1000b). The first portion (1000a) may be placed inside the grid pattern of the panel support member (700), i.e., inside the slit (SLT) described later (see FIG. 8). The second portion (1000b) is a portion placed on the first portion (1000a) and may be a portion placed on the lower surface of the panel support member (700). The first portion (1000a) and the second portion (1000b) may be placed overlapping the folding area (FDA) in the third direction (DR3).

[0097] In another embodiment, as illustrated in FIG. 6, the filling member (1000) may further include a third part (1000c) and a fourth part (1000d). The third part (1000c) is a part disposed on one side and / or the other side of the second part (1000b) and may be a part disposed overlapping with the non-folding area (FDA). The fourth part (1000d) is a part disposed on one side of the third part (1000d) and may be a part disposed on the side of the panel support member (700).

[0098] In one embodiment, the thickness of the third direction (DR3) of the second part (1000b) and the third part (1000c) may be approximately 5㎛ to 40㎛, but is not limited thereto.

[0099] In the drawings, the thickness of the second part (1000b) (e.g., the third direction (DR3) length) is shown as being smaller than the thickness of the third adhesive member (800) described later (e.g., the third direction (DR3) length), but is not limited thereto. In some embodiments, the thickness of the second part (1000b) may be the same as the thickness of the third adhesive member (800) described later. Accordingly, the second part (1000b) can come into direct contact with the lower functional member (900) and support the grid pattern of the panel support member (700) to improve the durability of the panel support member (700).

[0100] In another embodiment, a separate elastic member (not shown) may be further disposed between the second part (1000b) and the lower functional member (900). In this case, the elastic member (not shown) can support the gap between the second part (1000b) and the lower functional member (900).

[0101] The lower functional member (900) may include at least one member to perform various functions. For example, it may include at least one of a light-blocking layer for absorbing light incident from the outside, a buffer layer for absorbing shock from the outside, and a heat dissipation layer for efficiently dissipating heat from the display panel (400). Additionally, it may include a digitizer member for detecting the approach or contact of an electronic pen, such as a stylus pen that supports electromagnetic resonance (EMR). Additionally, it may include a waterproof and dustproof member to prevent the penetration of moisture or dust.

[0102] A third adhesive member (800) may be placed on the back surface of a panel support member (700). For example, a first adhesive member (300) may be placed between the panel support member (700) and a lower functional member (900). The panel support member (700) and the lower functional member (900) may be joined to each other through the third adhesive member (800). The third adhesive member (800) may include an adhesive material such as a pressure-sensitive adhesive (PSA) or an optically clear adhesive (OCA). The third adhesive member (800) may include an acrylic adhesive material.

[0103] The third adhesive member (800) may include a third-1 adhesive member (810) overlapping with the first non-folding area (NFA1) and a third-2 adhesive member (820) overlapping with the second non-folding area (NFA2).

[0104] In some embodiments, as shown in FIG. 5, the third-1 adhesive member (810) and the third-2 adhesive member (820) may be spaced apart from each other with the second portion (1000b) of the filling member (1000) in between. In other embodiments, as shown in FIG. 6, the third-1 adhesive member (810) and the third-2 adhesive member (820) may each be in direct contact with the third portion (1000c) of the filling member (1000).

[0105] FIG. 7 is a cross-sectional view showing an example of a display panel according to embodiments.

[0106] Referring to FIG. 7, the display panel (400) may include a substrate (SUB), a display layer (DISL) disposed on the substrate (SUB), and a touch sensing layer (TDL) disposed on the display layer (DISL). The display layer (DISL) may include a thin-film transistor layer (TFTL), a light-emitting element layer (EML), and an encapsulation layer (TFEL).

[0107] A thin-film transistor layer (TFTL) may be disposed on a substrate (SUB). The thin-film transistor layer (TFTL) may include a barrier film (BR), a thin-film transistor (TFT1), a first capacitor electrode (CAE1), a second capacitor electrode (CAE2), a first anode connection electrode (ANDE1), a second anode connection electrode (ANDE2), a gate insulating film (130), a first interlayer insulating film (141), a second interlayer insulating film (142), a first planarization film (160), and a second planarization film (180).

[0108] The substrate (SUB) may be made of an insulating material such as a polymer resin. For example, the substrate (SUB) may be made of polyimide. The substrate (SUB) may be a flexible substrate capable of bending, folding, rolling, etc.

[0109] A barrier film (BR) may be disposed on a substrate (SUB). The barrier film (BR) is a film for protecting the thin-film transistors of the thin-film transistor layer (TFTL) and the light-emitting layer (172) of the light-emitting element layer (EML) from moisture penetrating through the substrate (SUB), which is susceptible to moisture permeability. The barrier film (BR) may be composed of a plurality of inorganic films that are alternately stacked. For example, the barrier film (BR) may be formed as a multilayer film in which one or more inorganic films selected from a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, and an aluminum oxide layer are alternately stacked.

[0110] A thin-film transistor (TFT1) may be disposed on the barrier film (BR). An active layer (ACT1) of the thin-film transistor (TFT1) may be disposed on the barrier film (BR). The active layer (ACT1) of the thin-film transistor (TFT1) may include polycrystalline silicon, single-crystal silicon, low-temperature polycrystalline silicon, amorphous silicon, or an oxide semiconductor.

[0111] The active layer (ACT1) may include a channel region (CHA1), a source region (TS1), and a drain region (TD1). The channel region (CHA1) may be a region that overlaps with the gate electrode (TG1) in the third direction (DR3), which is the thickness direction of the substrate (SUB). The source region (TS1) may be disposed on one side of the channel region (CHA1), and the drain region (TD1) may be disposed on the other side of the channel region (CHA1). The source region (TS1) and the drain region (TD1) may be regions that do not overlap with the gate electrode (TG1) in the third direction (DR3). The source region (TS1) and the drain region (TD1) may be regions that have conductivity by doping ions or impurities into a silicon semiconductor or an oxide semiconductor.

[0112] A gate insulating film (130) may be disposed on the active layer (ACT1) of a thin film transistor (TFT1). The gate insulating film (130) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0113] A gate electrode (TG1) and a first capacitor electrode (CAE1) of a thin-film transistor (TFT1) may be disposed on the gate insulating film (130). The gate electrode (TG1) may overlap with the channel region (CHA1) in the third direction (DR3). Although FIG. 7 shows the gate electrode (TG1) and the first capacitor electrode (CAE1) disposed apart from each other, the gate electrode (TG1) and the first capacitor electrode (CAE1) may be connected to each other and formed as a single unit. The gate electrode (TG1) and the first capacitor electrode (CAE1) may be formed as a single layer or a multilayer made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0114] A first interlayer insulating film (141) may be disposed on the gate electrode (TG1) and the first capacitor electrode (CAE1) of a thin-film transistor (TFT1). The first interlayer insulating film (141) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. The first interlayer insulating film (141) may be formed of a plurality of inorganic films.

[0115] A second capacitor electrode (CAE2) may be disposed on the first interlayer insulating film (141). The second capacitor electrode (CAE2) may overlap with the first capacitor electrode (CAE1) of the thin-film transistor (TFT1) in the third direction (DR3). Additionally, when the gate electrode (TG1) and the first capacitor electrode (CAE1) are formed integrally, the second capacitor electrode (CAE2) may overlap with the gate electrode (TG1) in the third direction (DR3). Since the first interlayer insulating film (141) has a predetermined dielectric constant, a capacitor may be formed by the first capacitor electrode (CAE1), the second capacitor electrode (CAE2), and the first interlayer insulating film (141) disposed between them. The second capacitor electrode (CAE2) may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0116] A second interlayer insulating film (142) may be disposed on the second capacitor electrode (CAE2). The second interlayer insulating film (142) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. The second interlayer insulating film (142) may be formed of a plurality of inorganic films.

[0117] A first anode connection electrode (ANDE1) may be disposed on the second interlayer insulating film (142). The first anode connection electrode (ANDE1) may be connected to the drain region (TD1) of the thin-film transistor (TFT1) through a first connection contact hole (ANCT1) penetrating the gate insulating film (130), the first interlayer insulating film (141), and the second interlayer insulating film (142). The first anode connection electrode (ANDE1) may be formed as a single layer or a multilayer made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0118] A first flattening film (160) for flattening the step difference caused by a thin-film transistor (TFT1) may be disposed on the first anode connection electrode (ANDE1). The first flattening film (160) may be formed from an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0119] A second anode connecting electrode (ANDE2) may be disposed on the first flattening film (160). The second anode connecting electrode (ANDE2) may be connected to the first anode connecting electrode (ANDE1) through a second connecting contact hole (ANCT2) that penetrates the first flattening film (160). The second anode connecting electrode (ANDE2) may be formed as a single layer or a multilayer made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0120] A second planarization film (180) may be disposed on the second anode connection electrode (ANDE2). The second planarization film (180) may be formed from an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0121] A light-emitting element layer (EML) including light-emitting elements (LEL) and a bank (190) may be disposed on the second planarization film (180). Each of the light-emitting elements (LEL) includes a pixel electrode (171), a light-emitting layer (172), and a common electrode (173).

[0122] The pixel electrode (171) can be placed on the second planarization film (180). The pixel electrode (171) can be connected to the second anode connection electrode (ANDE2) through a third connection contact hole (ANCT3) that penetrates the second planarization film (180).

[0123] In a top emission structure that emits light in the direction of a common electrode (173) based on a light-emitting layer (172), the pixel electrode (171) can be formed from a highly reflective metallic material such as a stacked structure of aluminum (Al) and titanium (Ti) (Ti / Al / Ti), a stacked structure of aluminum (Al) and ITO (Indium Tin Oxide) (ITO / Al / ITO), a stacked structure of silver (Ag) and ITO (Indium Tin Oxide) (ITO / Ag / ITO), an APC alloy, and a stacked structure of APC alloy and ITO (ITO / APC / ITO). The APC alloy is an alloy of silver (Ag), palladium (Pd), and copper (Cu).

[0124] A bank (190) may be formed to partition a pixel electrode (171) on a second planarization film (180) to define light-emitting portions (EA1, EA2). A bank (190) may be positioned to cover the edges of the pixel electrode (171). A bank (190) may be formed from an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0125] Each of the first light-emitting part (EA1) and the second light-emitting part (EA2) represents a region in which a pixel electrode (171), a light-emitting layer (172), and a common electrode (173) are sequentially stacked, and light is emitted by the recombination of holes from the pixel electrode (171) and electrons from the common electrode (173) in the light-emitting layer (172).

[0126] A light-emitting layer (172) may be disposed on the pixel electrode (171) and the bank (190). The light-emitting layer (172) may include an organic material and emit a predetermined color. For example, the light-emitting layer (172) may include a hole transporting layer, an organic material layer, and an electron transporting layer.

[0127] A common electrode (173) may be disposed on the light-emitting layer (172). The common electrode (173) may be disposed to cover the light-emitting layer (172). The common electrode (173) may be a common layer formed in common on the first light-emitting part (EA1) and the second light-emitting part (EA2).

[0128] In the upper light-emitting structure, the common electrode (173) can be formed from a transparent conductive material (TCO) such as ITO or IZO that can transmit light, or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). When the common electrode (173) is formed from a semi-transmissive conductive material, the light emission efficiency can be increased by the micro cavity.

[0129] A spacer (191) may be placed on the bank (190). The spacer (191) may serve to support the mask during the manufacturing process of the light-emitting layer (172). The spacer (191) may be formed from an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0130] In some embodiments, the display panel (400) may further include a capping layer (CPL) disposed on the common electrode (173). The capping layer (CPL) may include an inorganic material. For example, the capping layer (CPL) may include at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and silicon oxynitride.

[0131] An encapsulation layer (TFEL) may be disposed on the common electrode (173). The encapsulation layer (TFEL) may include at least one inorganic film to prevent oxygen or moisture from penetrating the light-emitting element layer (EML). Additionally, the encapsulation layer (TFEL) may include at least one organic film to protect the light-emitting element layer (EML) from foreign substances such as dust. For example, the encapsulation layer (TFEL) may include a first encapsulation inorganic film (TFE1), an encapsulation organic film (TFE2), and a second encapsulation inorganic film (TFE3).

[0132] A first encapsulating inorganic film (TFE1) may be disposed on a common electrode (173), an encapsulating organic film (TFE2) may be disposed on the first encapsulating inorganic film (TFE1), and a second encapsulating inorganic film (TFE3) may be disposed on the encapsulating organic film (TFE2). The first encapsulating inorganic film (TFE1) and the second encapsulating inorganic film (TFE3) may be formed as a multilayer film in which one or more inorganic films selected from a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, and an aluminum oxide layer are alternately stacked. The encapsulating organic film (TFE2) may be an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0133] A touch sensing layer (TDL) may be disposed on the encapsulation layer (TFEL). The touch sensing layer (TDL) includes a first touch insulating film (TINS1), a connecting electrode (BE), a second touch insulating film (TINS2), a driving electrode (TE), a sensing electrode (RE), and a third touch insulating film (TINS3).

[0134] The first touch insulating film (TINS1) may be disposed on the encapsulation layer (TFEL). The first touch insulating film (TINS1) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0135] A connecting electrode (BE) may be disposed on the first touch insulating film (TINS1). The connecting electrode (BE) may be formed as a single layer or a multilayer made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0136] A second touch insulating film (TINS2) may be disposed on the connecting electrode (BE). The second touch insulating film (TINS2) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. Alternatively, the second touch insulating film (TINS2) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0137] Driving electrodes (TE) and sensing electrodes (RE) may be disposed on the second touch insulating film (TINS2). The driving electrodes (TE) and sensing electrodes (RE) may be formed as a single layer or a multilayer made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0138] The driving electrode (TE) and the sensing electrode (RE) can overlap with the connecting electrode (BE) in the third direction (DR3). The driving electrode (TE) can be connected to the connecting electrode (BE) through a touch contact hole (TCNT1) that penetrates the first touch insulating film (TINS1).

[0139] A third touch insulating film (TINS3) may be formed on the driving electrodes (TE) and the sensing electrodes (RE). The third touch insulating film (TINS3) may serve to flatten the step formed by the driving electrodes (TE), the sensing electrodes (RE), and the connecting electrodes (BE). The third touch insulating film (TINS3) may be formed from an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0140] FIG. 8 is a plan view of a panel support member according to embodiments.

[0141] Referring to FIG. 8, the panel support member (700) may include a folding portion (710), a first non-folding portion (720), and a second non-folding portion (730). The folding portion (710) may be placed in a folding area (FDA), the first non-folding portion (720) may be placed in a first non-folding area (NFA1), and the second non-folding portion (730) may be placed in a second non-folding area (NFA2). The folding area (FDA) is an area where the grid pattern of the folding portion (710) is placed, and the first and second non-folding areas (NFA1, NFA2) may be areas where the grid pattern is not placed.

[0142] The folding part (710) may be a part that folds when the display device (10) is folded. The folding part (710) may be positioned between the first non-folding part (720) and the second non-folding part (730) in the second direction (DR2).

[0143] The first non-folding part (720) and the second non-folding part (730) may be parts that are not folded when the display device (10) is folded. The first non-folding part (720) may be positioned on one side of the folding part (710) in the second direction (DR2), and the second non-folding part (730) may be positioned on the other side of the folding part (710) in the second direction (DR2).

[0144] The folding section (710) may include a grid pattern. For example, the folding section (710) may include a plurality of bars and a plurality of slits (SLT) disposed between the plurality of bars.

[0145] The plurality of bars may include a plurality of horizontal bars each extending in a second direction (DR2) and a plurality of vertical bars each extending in a first direction (DR1). The plurality of bars of the folding section (710) may be connected to each other without interruption, and may be connected to the first non-folding section (720) and the second non-folding section (730) without interruption.

[0146] Each of the multiple slits (SLT) may be a hole penetrating the panel support member (700) in the third direction (DR3). Each of the multiple slits (SLT) may extend in the second direction (DR2). For example, the length of each of the multiple slits (SLT) in the second direction (DR2) may be longer than the length in the first direction (DR1). The folding portion (710) may have flexibility by including the multiple slits (SLT). That is, the folding portion (710) may be extended in the first direction (DR1) when the display device (10) is folded.

[0147] FIG. 9 is a cross-sectional view taken along X1-X1' of FIG. 8. FIG. 10 is an enlarged view of region A of FIG. 9. FIG. 11 and FIG. 12 are enlarged views of region AA of FIG. 10. FIG. 13 is an enlarged view of region AB of FIG. 10.

[0148] In FIGS. 9, 10, 11, 12, and 13, the filling member (1000) inside the slit (SLT) is not shown for convenience of explanation.

[0149] With reference to FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG. 12, and FIG. 13, the panel support member (700) may include an upper surface (US), a lower surface (BS), a first inner surface (IP11), and a second inner surface (IP12).

[0150] The upper surface (US) and the lower surface (BS) may be surfaces facing each other in the third direction (DR3). The first inner surface (IP11) and the second inner surface (IP12) may be surfaces corresponding to the sides of the slit (SLT). The first inner surface (IP11) may be connected to the upper surface (US), and the second inner surface (IP12) may be connected to the lower surface (BS). Thus, the upper surface (US), the first inner surface (IP11), the second inner surface (IP12), and the lower surface (BS) may be connected to each other in that order.

[0151] The point where the upper surface (US) and the first inner surface (IP11) meet may be the first point (P1), the point where the lower surface (BS) and the second inner surface (IP12) meet may be the second point (P2), and the point where the first inner surface (IP11) and the second inner surface (IP12) meet may be the third point (P3).

[0152] The upper surface (US) and lower surface (BS) may be flat, and the first inner surface (IP11) and the second inner surface (IP12) may be curved. For example, on a cross-section cut by a plane defined by the first direction (DR1) and the third direction (DR3), the upper surface (US) and lower surface (BS) may be straight lines extending in the first direction (DR1), and the first inner surface (IP11) and the second inner surface (IP12) may be curved.

[0153] On the surfaces of the panel support member (700), a first surface with a curvature of 0 is called the upper surface (US), a point extending from the upper surface (US) where the curvature begins to be greater than 0 is defined as the first point (P1), and a surface with a curvature greater than 0 from the first point (P1) can be defined as the first inner surface (IP11). On the surface of the panel support member (700), a second surface with a curvature of 0 facing the upper surface (US) is called the lower surface (BS), a point extending from the lower surface (BS) where the curvature begins to be greater than 0 is defined as the second point (P2), and a surface with a curvature greater than 0 from the second point (P2) can be defined as the second inner surface (IP12).

[0154] In some embodiments, the first tangent (m1) touching the first inner surface (IP11) at the first point (P1) may extend parallel to the upper surface (US). That is, the slope of the first tangent (m1) of the first inner surface (IP11) at the first point (P1) may match the slope of the upper surface (US). Accordingly, the first inner surface (IP11) and the upper surface (US) are connected in a differentiable manner while maintaining tangential continuity, so that they can be smoothly connected without vertices.

[0155] In some embodiments, the second tangent (m2) that touches the first inner surface (IP11) at the third point (P3) may extend parallel to the third tangent (m3) that touches the second inner surface (IP12) at the third point (P3). That is, the slope of the second tangent (m2) at the third point (P3) and the slope of the third tangent (m3) may coincide. Accordingly, the first inner surface (IP11) and the second inner surface (IP12) are connected in a differentiable manner while maintaining tangential continuity, so that they can be smoothly connected without vertices.

[0156] On a cross-section cut by a plane defined by the first direction (DR1) and the third direction (DR3), a plurality of slits (SLT) may have shapes in which the width of the first direction (DR1) differs depending on the position in the third direction (DR3).

[0157] For example, the first width (W1), which is the width of the upper opening of the slit (SLT), may be smaller than the second width (W2), which is the width of the lower opening of the slit (SLT), and the third width (W3), which is the width of the narrowest part of the slit (SLT), may be smaller than the first width (W1), which is the width of the upper opening of the slit (SLT). The slit (SLT) may have the third width (W3) as its minimum width.

[0158] The first width (W1) may be the width of the slit (SLT) at a position parallel to the upper surface (US) in the horizontal direction (e.g., the first direction (DR1)), the second width (W2) may be the width of the slit (SLT) at a position parallel to the upper surface (BS) in the horizontal direction (e.g., the first direction (DR1)), and the third width (W3) may be the width of the slit (SLT) at a position parallel to the third point (P3) in the horizontal direction (e.g., the first direction (DR1)). For example, the first width (W1) may be the distance between the first points (P1) located on both sides of the slit (SLT), the second width (W2) may be the distance between the second points (P2) located on both sides of the slit (SLT), and the third width (W3) may be the distance between the third points (P3) located on both sides of the slit (SLT).

[0159] In one embodiment, the first width (W1) may be approximately 20 µm to 80 µm, the second width (W2) may be approximately 40 µm to 150 µm, and the third width (W3) may be approximately 10 µm to 40 µm. In some embodiments, the third direction (DR3) distance (T_13) between the third point (P3) and the top surface (US) may be approximately greater than 0.2 times and less than 0.4 times the thickness (T_700) of the panel support member (700). For example, when the thickness (T_700) of the panel support member (700) is approximately 80 µm to 150 µm, the third direction (DR3) distance (T_13) between the third point (P3) and the top surface (US) may be approximately greater than 15 µm and less than 60 µm.

[0160] According to the display device (10) of the present embodiment, the upper opening width of the slit (SLT) of the panel support member (700) is formed to be narrower than the lower opening width, thereby increasing the contact area between the panel support member (700) and the display panel (400), so that the panel support member (700) can support the display panel (400) better. Accordingly, the durability of the display device (10) can be improved.

[0161] In addition, by forming the lower opening width of the slit (SLT) of the panel support member (700) wider than the upper opening width, the stress applied to the panel support member (700) during in-folding of the display device (10) is minimized, and the flexibility of the display device (10) can be improved.

[0162] As illustrated in FIG. 11, a first reference point (Q1) can be defined where a straight line extending in a horizontal direction (e.g., the first direction (DR1)) meets a first inner surface (IP11) at a point located at a distance of a first vertical distance (Dy1) from a first point (P1) in a vertical direction (e.g., the third direction (DR3)). In one embodiment, the first vertical distance (Dy1) may be 0.5 μm. The first vertical distance (Dy1) may be the maximum allowable distance at which no damage is inflicted on the display panel (100) when the display panel (100) placed on the panel support member (700) is deformed by being pressed into the slit (SLT) by external pressure.

[0163] The first reference point (Q1) may be spaced apart from the first point (P1) by a first horizontal distance (Dx1) in the horizontal direction (e.g., the first direction (DR1)). The first horizontal distance (Dx1) may be 2 to 4 times the first vertical distance (Dy1). For example, if the first vertical distance (Dy1) is approximately 0.5 μm, the first horizontal distance (Dx1) may be approximately 1 μm to 2 μm.

[0164] In some embodiments, the first angle (θ1) formed by the first tangent (n1) touching the first inner surface (IP11) at the first reference point (Q1) with the upper surface (US) may be 15 degrees or more and 30 degrees or less.

[0165] In the display device (10) according to the present embodiment, the first angle (θ1) measured relative to a first reference point (Q1) located at a distance of a first vertical distance (Dy1), which is the maximum allowable distance at which no damage is applied to the display panel (100), is 30 degrees or less, thereby minimizing deformation caused by pressing of the display panel (100). For example, while the display panel (100) is deformed by pressing up to the first vertical distance (Dy1), which is the maximum allowable distance, the first angle (θ1) is 30 degrees or less, so the first inner surface (IP11) between the first point (P1) and the first reference point (Q1) can form a gentle curve. Accordingly, deformation applied to the display panel (100) between the first point (IP11) and the first reference point (Q1) can be minimized.

[0166] As illustrated in FIG. 13, a second reference point (Q2) may be defined where a straight line extending in a horizontal direction (e.g., a first direction (DR1)) meets a second inner surface (IP12) at a point located a second vertical distance (Dy2) away from a second point (P2) in a vertical direction (e.g., a third direction (DR3)). The second reference point (Q2) may be located a second horizontal distance (Dx2) away from the second point (P2) in a horizontal direction (e.g., a first direction (DR1)). The second horizontal distance (Dx2) may be one to two times the second vertical distance (Dy2).

[0167] In some embodiments, the second angle (θ2) formed by the second tangent (n2) at the second reference point (Q2) to the second inner surface (IP12) with the lower surface (BS) may be greater than the first angle (θ1). In one embodiment, the second vertical distance (Dy2) may be 0.5 μm, which is the same as the first vertical distance (Dy1).

[0168] As illustrated in FIG. 12, a first contact (PQ1) and a second contact (PQ2) located on the first inner surface (IP11) can be defined, respectively. The first contact (PQ1) can be located adjacent to the first point (P1), and the second contact (PQ2) can be located adjacent to the third point (P3). The first contact (PQ1) and the second contact (PQ2) can each have the same distance from the first point (P1) and the third point (P3) on the first inner surface (IP11) (distance along the first inner surface (IP11)). That is, the distance between the first point (P1) and the first contact (PQ1) on the first inner surface (IP11) can be the same as the distance between the second point (P2) and the second contact (PQ2) on the first inner surface (IP11).

[0169] In some embodiments, the first radius (R1) of the first inscribed circle (C1) inscribed in the first inner surface (IP11) at the first contact point (PQ1) may be larger than the second radius (R2) of the second inscribed circle (C2) inscribed in the first inner surface (IP11) at the second contact point (PQ2). That is, the radius of curvature of the first inner surface (IP11) at the first contact point (PQ1) may be larger than the radius of curvature of the first inner surface (IP11) at the second contact point (PQ2).

[0170] In one embodiment, the radius of curvature of the first inner surface (IP11) measured at any point on the first inner surface (IP11) may be in the range of approximately 0.3 to 0.5 times the thickness (T_700) of the panel support member (700). For example, the radius of curvature of the first inner surface (IP11) measured at any point on the first inner surface (IP11) may be in the range of 20 μm to 80 μm.

[0171] As illustrated in FIG. 13, any third contact (PQ3) located on the second inner surface (IP12) may be defined. The third contact (PQ3) may be any point located between the second point (P2) and the third point (P3) on the second inner surface (IP12).

[0172] In some embodiments, the third radius (R3) of the third inscribed circle (C3) inscribed in the second inner surface (IP12) at the third contact point (PQ3) may be larger than the first radius (R1) and the second radius (R2). That is, the radius of curvature measured at any point on the second inner surface (IP12) may be larger than the radius of curvature measured at any point on the first inner surface (IP11).

[0173] In some embodiments, when the third width (W3) is defined as A, the first width (W1) is defined as B, and the third direction (DR3) distance (T_13) between the third point (P3) and the upper surface (US) is defined as D, the panel support member (700) may have a shape optimization index Ω defined by the following mathematical formula 1 of 0.35 or higher.

[0174]

[0175] The shape optimization index Ω is an index indicating the optimal shape of the slit (SLT) to stably support the display panel (100) and increase durability.

[0176] According to the display device (10) according to the present embodiment, as the first width (W1) (value B of Equation 1) becomes narrower (i.e., as the shape optimization index Ω becomes larger), the durability of the display panel (100) placed on the panel support member (700) can be improved, and the crease caused by the slit (SLT) can be prevented from being visible. As the first width (W1) (value B of Equation 1) becomes infinitely narrower (or closer to 0), the shape optimization index Ω can become infinitely large, so the upper limit of the shape optimization index Ω may not be limited.

[0177] In addition, the first inner surface (IP11) and the upper surface (US) are smoothly connected, and the smaller the first angle (θ1), which is the slope of the first tangent (n1) in the area extending from the first point (P1) to the first reference point (Q1) of the first inner surface (IP11), the damage caused by pressing of the display panel (100) can be minimized. Here, the first angle (θ1) is a value related to the slope of the first inner surface (IP11), and the D / (BA) value in Equation 1 is correlated with the first angle (θ1). As the D / (BA) value increases, the shape optimization index Ω can increase. The value D, which is the third direction (DR3) distance (T_13) between the third point (P3) and the upper surface (US), can be limited to a certain range (greater than 0.2 times and less than 0.4 times) of the thickness (T_700) of the panel support member (700) as described above, depending on the etching process conditions of the manufacturing method (S1) of the display device described later (see FIG. 13). Therefore, as the value of (BA) decreases, the shape optimization index Ω can increase.

[0178] Meanwhile, as described above, the radius of curvature measured at any point on the second inner surface (IP12) is greater than the radius of curvature measured at any point on the first inner surface (IP11), and since the second angle (θ2) is greater than the first angle (θ1), the second width (W2) can be formed to be larger than the first width (W1). Accordingly, the stress applied to the panel support member (700) during the in-folding of the display device (10) is minimized, and the flexibility of the display device (10) can be improved.

[0179] FIG. 14 is an enlarged view showing area A of a panel support member according to another embodiment. FIG. 14 describes another embodiment of a panel support member according to an embodiment described with reference to FIG. 10 and others. For convenience of explanation, the filling member (1000) inside the slit (SLT) is not shown in FIG. 14. In the embodiment of FIG. 14, components identical to those in the embodiment of FIG. 10 and others are referred to by the same reference numerals, and redundant descriptions are omitted or simplified, with the focus on the differences.

[0180] Referring to FIG. 14 in addition to FIG. 8, FIG. 9, and FIG. 10, the panel support member (700) may include an upper surface (US), a lower surface (BS), a first inner surface (IP11), a second inner surface (IP12), and a third inner surface (IP13).

[0181] The upper surface (US) and the lower surface (BS) may be surfaces facing each other in the third direction (DR3). The first inner surface (IP11), the second inner surface (IP12), and the third inner surface (IP13) may be surfaces corresponding to the sides of the slit (SLT). The first inner surface (IP11) may be connected to the upper surface (US), the second inner surface (IP12) may be connected to the lower surface (BS), and the third inner surface (IP13) may be connected between the first inner surface (IP11) and the second inner surface (IP12). Thus, the upper surface (US), the first inner surface (IP11), the third inner surface (IP13), the second inner surface (IP12), and the lower surface (BS) may be connected to each other in that order.

[0182] The point where the upper surface (US) and the first inner surface (IP11) meet may be the first point (P1), the point where the lower surface (BS) and the second inner surface (IP12) meet may be the second point (P2), the point where the first inner surface (IP11) and the third inner surface (IP13) meet may be the third point (P3), and the point where the second inner surface (IP12) and the third inner surface (IP13) meet may be the fourth point (P4).

[0183] The upper surface (US), lower surface (BS), and second inner surface (IP12) may be flat, and the first inner surface (IP11) and third inner surface (IP13) may be curved. For example, on a cross-section cut by a plane defined by the first direction (DR1) and the third direction (DR3), the upper surface (US) and lower surface (BS) may be straight lines extending in the first direction (DR1), the second inner surface (IP12) may be straight lines extending in the diagonal direction defined by the first direction (DR1) and the third direction (DR3), and the first inner surface (IP11) and second inner surface (IP12) may be curved.

[0184] On the surfaces of the panel support member (700), a first surface with a curvature of 0 is called the upper surface (US), a point extending from the upper surface (US) where the curvature begins to become greater than 0 is defined as the first point (P1), and a surface with a curvature greater than 0 from the first point (P1) can be defined as the first inner surface (IP11). On the surface of the panel support member (700), a second surface with a curvature of 0 facing the upper surface (US) is called the lower surface (BS), a point extending from the lower surface (BS) where the slope becomes different is defined as the second point (P2), and a surface having a slope different from the lower surface (BS) from the second point (P2) can be defined as the second inner surface (IP12). The point extending from the second inner surface (IP12) where the curvature begins to become greater than 0 can be defined as the fourth point (P4), and the surface from the fourth point (P4) where the curvature is greater than 0 can be defined as the third inner surface (IP11). The third point (P3) where the first inner surface (IP11) and the third inner surface (IP13) meet can be defined as the point where the narrowest part of the slit (SLT) is located.

[0185] The second tangent (m2) that is tangent to the first inner surface (IP11) at the third point (P3) can be extended parallel to the third tangent (m3) that is tangent to the third inner surface (IP13) at the third point (P3). That is, the slope of the second tangent (m2) at the third point (P3) and the slope of the third tangent (m3) can coincide. Accordingly, the first inner surface (IP11) and the third inner surface (IP13) are connected in a differentiable manner while maintaining tangential continuity, so that they can be smoothly connected without vertices.

[0186] At the fourth point (P4), the fourth tangent (m4) that touches the third inner surface (IP13) can be extended parallel to the second inner surface (IP12). That is, at the fourth point (P4), the slope of the first tangent (m1) of the third inner surface (IP13) and the slope of the second inner surface (IP12) can coincide. Accordingly, the second inner surface (IP12) and the third inner surface (IP13) can be connected in a differentiable manner while maintaining tangential continuity, so that they can be smoothly connected without vertices.

[0187] FIG. 15 is a cross-sectional view showing a ball drop test performed on a laminated structure of a display panel and a panel support member according to the embodiments.

[0188] Referring to FIG. 15, the panel support member (700) according to the embodiments can improve the durability of the display device (10) by smoothly connecting the upper surface (US) and the first inner surface (IP11) at a first point (P1) and smoothly connecting the first inner surface (IP11) and the second inner surface (IP12) (or the third inner surface (IP13) (see FIG. 14)) at a third point (P3).

[0189] For example, since the upper surface (US) and the first inner surface (IP11) are smoothly connected at the first point (P1), no tip is formed, so damage to the display panel (400) at the first point (P1) can be minimized even in situations where the display panel (400) is subjected to pressure, such as in a ball drop test.

[0190] In addition, as in the manufacturing method (S1) of the display device described below, the filling member (1000) is formed by filling with resin and then curing. Since the upper surface (US) and the first inner surface (IP11) are smoothly connected at the second point (P2), no tip is formed, so the panel support member (700) and the filling member (1000) can be firmly joined. Accordingly, the durability of the panel support member (700) can be improved.

[0191] Meanwhile, since the slit (SLT) is narrowest at the third point (P3) and has a relatively wider width at the first point (P1) and the second point (P2), the filling member (1000) can be firmly bonded to the panel support member (700) after the resin is cured. That is, the part of the filling member (1000) that contacts the first inner surface (IP11) is engaged with the panel support member (700) in a hook shape, so that the panel support member (700) and the filling member (1000) do not easily separate from each other and can maintain a firmly bonded state. Accordingly, the durability of the panel support member (700) can be improved.

[0192] Hereinafter, a method for manufacturing a display device according to one embodiment is described.

[0193] FIG. 16 is a flowchart illustrating a method for manufacturing a display device according to embodiments. FIG. 17 is a cross-sectional view illustrating step S100 of FIG. 16. FIG. 18 and FIG. 19 are cross-sectional views illustrating step S200 of FIG. 16. FIG. 20 is a cross-sectional view illustrating step S300 of FIG. 16. FIG. 21 is a cross-sectional view illustrating step S400 of FIG. 16. FIG. 22 is a cross-sectional view illustrating step S500 of FIG. 16. FIG. 23 to 26 are cross-sectional views illustrating step S600 of FIG. 16.

[0194] Referring to FIGS. 16 to 26, a method for manufacturing a display device (S1) according to the present embodiment may include the steps of: irradiating a glass plate with a laser to form a sketch line (S100); contacting a first etching solution with at least one surface of the glass plate on which the sketch line is formed to form a slit in an area corresponding to the sketch line (S200); immersing the glass plate on which the slit is formed in a second etching solution to perform a first healing step (S300); immersing the glass plate that has been performed a first healing step in a molten salt to perform a chemical strengthening step (S400); immersing the chemically strengthened glass plate in a third etching solution to perform a second healing step (S500); and filling the slit of the glass plate that has been performed a second healing step with resin (S600).

[0195] First, as shown in FIG. 17, a sketch line (LS) can be formed by irradiating a glass plate (GPLT) with a laser (LR). (S100 in FIG. 16)

[0196] A laser processing device (LD) can irradiate a laser (LR) onto a glass plate (GPLT). As shown in the drawing, the laser processing device (LD) may irradiate a laser (LR) from one side (BS_G) of the glass plate (GPLT), but is not limited thereto, and may also irradiate a laser (LR) from the other side (US_G) of the glass plate (GPLT). Here, one side (BS_G) of the glass plate (GPLT) may become the lower surface (BS) of the display device (10) (see FIG. 10) described with reference to FIG. 10, etc., after the manufacturing process of the display device is completed, and the other side (US_G) of the glass plate (GPLT) may become the upper surface (US) of the display device (10) (see FIG. 10) described with reference to FIG. 10, etc., after the manufacturing process of the display device is completed.

[0197] In one embodiment, the laser processing device (LD) may use a picosecond or femtosecond laser beam of the infrared series as the laser (LR). The laser processing device (LD) may use a Bessel beam or a focused beam through an objective lens as the laser (LR).

[0198] When a laser processing device (LD) irradiates a laser (LR) onto a glass plate (GPLT), a sketch line (LS) may be formed on the glass plate (GPLT). As shown in the drawing, the sketch line (LS) may be composed of multiple spots, but is not limited thereto and may be formed as a single line. The sketch line (LS) may serve as a guide line or an induced line for controlling the shape of the slit (SLT) before forming the shape of the slit (SLT) through etching using the first etching solution (ECH1) described later.

[0199] In some embodiments, the process of forming a sketch line (LS) by irradiating a laser (LR) can be performed by a laser drilling process. A laser drilling process refers to a process of partially removing or drilling a glass plate (GPLT) by irradiating a laser (LR). Accordingly, the sketch line (LS) may include a plurality of physically removed (or drilled) through holes.

[0200] In another embodiment, the process of forming a sketch line (LS) by irradiating a laser (LR) can be performed by a laser modification process. A laser modification process refers to a process of locally changing the physical or chemical properties of a glass plate (GPLT) by irradiating a laser (LR). Accordingly, the sketch line (LS) may include a modified region in which the physical or chemical properties have been changed.

[0201] Next, as shown in FIGS. 18 and 19, a first etching solution (ECH1) can be brought into contact with at least one surface of a glass plate (GPLT) on which a sketch line (LS) is formed to form a slit (SLT) in an area corresponding to the sketch line (LS). (S200 of FIG. 16)

[0202] In some embodiments, the first etchant (ECH1) may be sprayed onto at least one surface of the glass plate (GPLT). For example, the first etchant (ECH1) may be sprayed onto one surface (BS_G) of the glass plate (GPLT). The first etchant (ECH1) is ammonium ions (NH4 + ) and heavy fluoride ions (HF2 - It may include ). For example, ammonium ions (NH4) relative to the total material in the first etching solution (ECH1). + ) and heavy fluoride ions (HF2 -The sum of the molar percentages (mol%) of ) may be approximately less than 30 mol%. In one embodiment, the etching rate of the glass plate (GPLT) by the first etching solution (ECH1) may be approximately 5 µm / min to 15 µm / min.

[0203] In another embodiment, although not illustrated in the drawings, the glass plate (GPLT) may be immersed in the first etching solution (ECH1) and come into contact with the first etching solution (ECH1). For example, the glass plate (GPLT) may be placed on a stage (STG) (or a carrier substrate, roller, etc.) and immersed in a tank containing the first etching solution (ECH1). At this time, since the other side (US_G) of the glass plate (GPLT) is in contact with one side of the stage (STH), the glass plate (GPLT) may not come into direct contact with the first etching solution (ECH1) at the moment it is immersed in the first etching solution (ECH1). On the other hand, the one side (BS_G) of the glass plate (GPLT) may come into direct contact with the first etching solution (ECH1) at the moment it is immersed in the first etching solution (ECH1). Accordingly, the glass plate (GPLT) can be processed into the same shape as when the first etching solution (ECH1) is sprayed onto at least one surface of the glass plate (GPLT).

[0204] The following describes the case where the first etching solution (ECH1) is sprayed onto a glass plate (GPLT).

[0205] The thickness of the glass plate (GPLT) can be slimmed by etching with the first etching solution (ECH1). The first thickness (TH1), which is the initial thickness of the glass plate (GPLT), can be reduced to a second thickness (TH2), which is the later thickness. In one embodiment, the first thickness (TH1) may be approximately 200 µm to 300 µm, and the second thickness (TH2) may be approximately 80 µm to 150 µm, but is not limited thereto.

[0206] As illustrated in FIG. 19, one side (BS_G) of the glass plate (GPLT) is directly sprayed with the first etching solution (ECH1), whereas the other side (US_G) of the glass plate (GPLT) is in direct contact with the stage (STG). Therefore, the time (or degree) of contact with the first etching solution (ECH1) may be shorter on the other side (US_G) of the glass plate (GPLT) than on the one side (BS_G). Accordingly, a slit (SLT) with a wider opening may be formed on the one side (BS_G) than on the other side (US_G) of the glass plate (GPLT).

[0207] Meanwhile, as illustrated in FIG. 18, the first etchant (ECH1) can move rapidly from one side (BS_G) to the other side (US_G) along the sketch line (LS). When the first etchant (ECH1) reaches the boundary between the other side (US_G) and one side of the stage (STG), the first etchant (ECH1) can remain in the internal space of the etched glass plate (GPLT). The remaining first etchant (ECH1) can etch the area near the other side (US_G) of the glass plate (GPLT) by diffusing along the boundary between the other side (US_G) and one side of the stage (STG). Accordingly, etching can proceed at a faster rate near the other side (US_G) of the glass plate (GPLT) than at the point where the final narrow part of the slit (SLT) is formed. Accordingly, a wider width can be formed near the other side (US_G) of the glass plate (GPLT) than at the final narrow part of the slit (SLT).

[0208] Next, as shown in FIG. 20, the glass plate (GPLT) with the slit (SLT) formed thereon can be immersed in a second etching solution (ECH2) for primary healing. (S300 in FIG. 16)

[0209] A glass plate (GPLT) with a slit (SLT) formed therein can be immersed in a second etching solution (ECH2). The glass plate (GPLT) immersed in the second etching solution (ECH2) can be etched at a slow rate, primarily on the surface in contact with the second etching solution (ECH2). Accordingly, surface defects of the glass plate (GPLT) can be repaired or mitigated, and surface roughness can be minimized. In other words, the durability of the glass plate (GPLT) can be improved.

[0210] The second etching solution (ECH2), like the first etching solution (ECH1), contains ammonium ions (NH4 + ) and heavy fluoride ions (HF2 - It may include ) ammonium ions (NH4 relative to total ions in the second etching solution (ECH2). + The ratio of ) to the total ions in the first etchant (ECH1) is ammonium ions (NH4 + The ratio may differ from that of ), and the ratio of heavy fluoride ions (HF2) relative to total ions in the second etchant (ECH2) - The ratio of ) to the total ions in the first etchant (ECH1) is heavy fluoride ions (HF2 - The ratio may differ from that of ). For example, in the first etchant (ECH1), ammonium ions (NH4) relative to total ions + The ratio of ) to the total ions in the second etchant (ECH2) is ammonium ions (NH4 + It may be smaller than the ratio of ) and heavy fluoride ions (HF2) relative to total ions in the first etchant (ECH1). - The ratio of ) to the total ions in the second etchant (ECH2) is heavy fluoride ions (HF2 - It can be larger than the ratio of ).

[0211] Accordingly, the etching rate of the glass plate (GPLT) by the second etching solution (ECH2) may be slower than the etching rate of the glass plate (GPLT) by the first etching solution (ECH1). For example, the etching rate of the glass plate (GPLT) by the second etching solution (ECH2) may be approximately 0.5 μm / min to 3 μm / min.

[0212] Next, as shown in FIG. 21, the primary healed glass plate (GPLT) can be chemically strengthened by immersing it in molten salt (MTS). (S400 in FIG. 16)

[0213] The primary healed glass plate (GPLT) can be immersed in molten salt (MTS). The glass plate (GPLT) immersed in molten salt (MTS) can have its durability improved through ion exchange. In some embodiments, the molten salt (MTS) may contain potassium nitrate (KNO3). For example, potassium ions (K) of potassium nitrate (KNO3) + ) sodium ions (Na) on the glass plate (GPLT) + It can be replaced with ). In one embodiment, the temperature at which the strengthening process is performed may be approximately 320°C to 420°C.

[0214] Accordingly, the compressive stress of the glass plate (GPLT) can be improved. For example, the compressive stress of the glass plate (GPLT) after the strengthening process may be approximately 500 MPa to 900 MPa, and the depth of layer (or depth of compression) may be approximately 5 μm to 10 μm.

[0215] Next, as shown in FIG. 22, the chemically strengthened glass plate (GPLT) can be immersed in a third etching solution (ECH3) for secondary healing. (S500 in FIG. 16)

[0216] The reinforced glass plate (GPLT) can be immersed in the third etching solution (ECH3). The glass plate (GPLT) immersed in the third etching solution (ECH3) can be etched at a slow rate, primarily on the surface in contact with the third etching solution (ECH3). Accordingly, surface defects of the glass plate (GPLT) can be repaired or mitigated, and surface roughness can be minimized. In other words, the durability of the glass plate (GPLT) can be improved.

[0217] The third etching solution (ECH3), like the first etching solution (ECH1) and the second etching solution (ECH2), contains ammonium ions (NH4 + ) and heavy fluoride ions (HF2 - It may include ). In some embodiments, the third etchant (ECH3) may include substantially the same material as the second etchant (ECH2). For example, ammonium ions (NH4) relative to total ions in the third etchant (ECH3). + The ratio of ) to the total ions in the second etchant (ECH2) is ammonium ions (NH4 + It can be substantially the same as the ratio of ) and heavy fluoride ions (HF2) relative to total ions in the third etchant (ECH3). - The ratio of ) to the total ions in the second etchant (ECH2) is heavy fluoride ions (HF2 - It can be substantially the same as the ratio of ).

[0218] Accordingly, the etching rate of the glass plate (GPLT) by the third etching solution (ECH3) may be slower than the etching rate of the glass plate (GPLT) by the first etching solution (ECH1). For example, the etching rate of the glass plate (GPLT) by the third etching solution (ECH3) may be approximately 0.5 μm / min to 3 μm / min.

[0219] In some embodiments, the second healing process with the third etching solution (ECH3) may be performed for a shorter time than the first healing process with the second etching solution (ECH2). Accordingly, the amount of etching in the second healing process with the third etching solution (ECH3) may be smaller than the amount of etching in the first healing process with the second etching solution (ECH2). For example, the amount of etching in the second healing process with the third etching solution (ECH3) may be approximately 0.5 μm to 2 μm, and the amount of etching in the first healing process with the second etching solution (ECH2) may be approximately 1 μm to 10 μm.

[0220] Next, as illustrated in FIGS. 23 to 26, resin (RSN) can be filled into the slit (SLT) of the secondary healed glass plate (GPLT). (S600 of FIG. 16)

[0221] When the secondary healing process of the glass plate (GPLT) is finished, a panel support member (700) can be formed.

[0222] As illustrated in FIG. 23, a carrier film (CRF) may be laminated onto the upper surface (US) of a panel support member (700). An opening of a slit (SLT) adjacent to the upper surface (US) may be covered and sealed by the carrier film (CRF). Since no carrier film (CRF) is placed on the lower surface (BS), an opening of a slit (SLT) adjacent to the lower surface (BS) may be left open without being sealed.

[0223] Then, as illustrated in FIG. 24, the first head (HD1) can apply liquid resin (RSN) to the slit (SLT). The first head (HD1) can apply the resin (RSN) by jetting or slit printing. As illustrated in FIG. 25, the resin (RSN) can be applied (overcoated) above the lower surface (BS) of the panel support member (700), that is, over the lower surface (BS). In one embodiment, the thickness of the overcoated portion of the resin (RSN) after curing may be approximately 5 μm to 10 μm, but is not limited thereto.

[0224] Then, as illustrated in FIG. 25, the second head (HD2) can cure the liquid resin (RSN). The second head (HD2) can cure the resin (RSN) by heat curing or UV curing. As another example, the resin (RSN) may be cured by natural curing without the second head (HD2).

[0225] In some embodiments, the shear modulus of the resin (RSN) after curing may be approximately less than 100 MPa. The shear modulus may be measured according to the ISO 1922 standard.

[0226] Accordingly, as shown in FIG. 26, a panel support member (700) can be formed with a filling member (1000) combined inside the slit (SLT) and on the lower surface (BS).

[0227] According to the manufacturing method (S1) of the display device according to the present embodiment, the durability and flexibility of the display device (10) can be improved by forming a panel support member (700) of the aforementioned shape (see FIG. 10, etc.) by a laser (LR) process and an etching process of a first etching solution (ECH). In addition, the durability of the panel support member (700) can be improved through a first healing process, a chemical strengthening process, a second healing process, and a resin (RSN) filling process.

[0228] The display device (10) according to the above-described embodiments can be applied to various electronic devices (1). An electronic device (1) according to one embodiment includes the above-described display device (10) and may further include a module or device having additional functions other than the display device (10).

[0229] FIG. 27 is a block diagram of an electronic device according to one embodiment.

[0230] Referring to FIG. 27, an electronic device (1) according to one embodiment may include a display module (11), a processor (12), a memory (13), and a power module (14).

[0231] The processor (12) may include at least one of a central processing unit (CPU), an application processor (AP), a graphic processing unit (GPU), a communication processor (CP), an image signal processor (ISP), and a controller.

[0232] The memory (13) may store data information necessary for the operation of the processor (12) or the display module (11). When the processor (12) executes an application stored in the memory (13), an image data signal and / or an input control signal are transmitted to the display module (11), and the display module (11) can process the received signal and output image information through a display screen.

[0233] The power module (14) may include a power supply module, such as a power adapter or battery device, and a power conversion module that converts the power supplied by the power supply module to generate power required for the operation of the electronic device (1).

[0234] At least one of each component of the electronic device (1) described above may be included in the display device (10) according to the embodiments described above. Additionally, some of the individual modules functionally included in one module may be included in the display device (10), while others may be provided separately from the display device (10). For example, the display device (10) may include a display module (11), and the processor (12), memory (13), and power module (14) may be provided in the form of other devices within the electronic device (1) other than the display device (10).

[0235] FIG. 28 is a schematic diagram of an electronic device according to various embodiments.

[0236] Referring to FIG. 28, various electronic devices (1) to which a display device (10) according to embodiments is applied may include not only image display electronic devices (1) such as a smartphone (1_1a), tablet PC (1_1b), laptop (1_1c), TV (1_1d), and desk monitor (1_1e), but also wearable electronic devices (1) including display modules such as smart glasses (1_2a), head-mounted display (1_2b), and smart watch (1_2c), and automotive electronic devices (1_3) including display modules such as a CID (Center Information Display) and room mirror display placed on the instrument panel, center fascia, and dashboard of a car.

[0237] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing the technical concept or essential features thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

1. A display panel including a folding area and a non-folding area; and A panel support member comprising a folding portion disposed on the above-mentioned display panel and a non-folding portion disposed in the above-mentioned folding area and a non-folding portion disposed in the above-mentioned non-folding area, and The above folding part includes a grid pattern in which a plurality of slits and a plurality of bars are alternately arranged, and The panel support member comprises, on a cross-section cut in the thickness direction, a first surface located adjacent to the display panel, a second surface facing the first surface, a first inner surface connected to the first surface within the slit and disposed between the first surface and the second surface and including a curved surface, and a second inner surface disposed between the first inner surface and the second surface within the slit. The point where the first surface and the first inner surface meet is defined as the first point, the point where the second surface and the second inner surface meet is defined as the second point, and the point where the first inner surface and the second inner surface meet is defined as the third point. The above slit has a first width in a direction parallel to the first surface at the first point, a second width in a direction parallel to the second surface at the second point, and a third width, which is a minimum width, in a direction parallel to at least one of the first surface and the second surface at the third point. The third width is smaller than the first width, and the first width is smaller than the second width, A first reference point is defined where a straight line extending in a horizontal direction perpendicular to the thickness direction meets the first inner surface at a point located at a first vertical distance in the thickness direction from the first point, and A display device in which, when the first vertical distance is 0.5 μm, the first angle formed by the first tangent line touching the first inner surface at the first reference point with the first surface is 15 degrees or more and 30 degrees or less.

2. In Paragraph 1, The distance between the first reference point and the first point in the above horizontal direction is defined as the first horizontal distance, and A display device in which the first horizontal distance is 2 to 4 times the first vertical distance.

3. In Paragraph 1, A second reference point is defined where a straight line extending in the horizontal direction meets the second inner surface at a point located at a distance of a second vertical distance in the thickness direction from the second point, and The second angle formed by the second tangent line touching the second inner surface at the second reference point with the second surface is greater than the first angle, and The above second vertical distance is a display device identical to the above first vertical distance.

4. In Paragraph 1, A first contact adjacent to the first point and a second contact adjacent to the third point are defined, located on the first inner surface, and The distance between the first point and the first contact point on the first inner surface is the same as the distance between the third point and the second contact point on the first inner surface, and A display device in which the first radius of a first inscribed circle inscribed within the first inner surface at the first contact point is larger than the second radius of a second inscribed circle inscribed within the first inner surface at the second contact point.

5. In Paragraph 4, Any third contact located on the second inner surface is defined, and A display device in which the third radius of the third inscribed circle inscribed in the second inner surface at the third contact point is larger than the first radius and the second radius.

6. In Paragraph 1, A display device in which the distance of the third point from the first surface in the thickness direction is greater than 0.2 times and less than 0.4 times the thickness of the panel support member.

7. In Paragraph 6, A display device having a thickness of 80㎛ to 150㎛ for the panel support member.

8. In Paragraph 1, A display device having a first width of 20㎛ to 80㎛, a second width of 40㎛ to 150㎛, and a third width of 10㎛ to 40㎛.

9. In Paragraph 1, The second inner surface is a display device comprising a curved surface adjacent to the first inner surface and a flat surface adjacent to the second surface.

10. In Paragraph 1, The above panel support member is a display device including glass.

11. In Paragraph 1, A display device further comprising a filling member including a first portion disposed inside the slit, and a second portion disposed overlapping with the folding portion on the second surface.

12. In Paragraph 11, A display device comprising the above-mentioned filling member further including a third portion disposed overlapping the non-folding portion on the second surface and a fourth portion disposed on the side of the panel support member.

13. A display panel including a folding area and a non-folding area; and A panel support member comprising a folding portion disposed on the above-mentioned display panel and a non-folding portion disposed in the above-mentioned folding area and a non-folding portion disposed in the above-mentioned non-folding area, and The above folding part includes a grid pattern in which a plurality of slits and a plurality of bars are alternately arranged, and The panel support member comprises, on a cross-section cut in the thickness direction, a first surface located adjacent to the display panel, a second surface facing the first surface, a first inner surface connected to the first surface within the slit and disposed between the first surface and the second surface and including a curved surface, and a second inner surface disposed between the first inner surface and the second surface within the slit. The point where the first surface and the first inner surface meet is defined as the first point, the point where the second surface and the second inner surface meet is defined as the second point, and the point where the first inner surface and the second inner surface meet is defined as the third point. The above slit has a first width in a direction parallel to the first surface at the first point, a second width in a direction parallel to the second surface at the second point, and a third width, which is a minimum width, in a direction parallel to at least one of the first surface and the second surface at the third point. The third width is smaller than the first width, and the first width is smaller than the second width, A display device characterized in that the above panel support member has a shape optimization index Ω defined by the following mathematical formula 1, which is 0.35 or higher: [Mathematical Formula 1] Here, w1 represents the first width, w3 represents the third width, and D represents the distance at which the third point is spaced from the first surface in the thickness direction.

14. In Paragraph 13, The above w3 is 10㎛ to 40㎛, and The above w1 is 20㎛ to 80㎛, and The above D is a display device having a size of 20㎛ to 50㎛.

15. A step of forming a sketch line by irradiating a glass plate with a laser; A step of contacting a first etching solution with at least one surface of a glass plate having the above sketch line formed thereon to form a slit in an area corresponding to the above sketch line; A step of immersing the glass plate with the slit formed thereon in a second etching solution for first healing; A step of chemically strengthening the above-mentioned first-healed glass plate by immersing it in molten salt; A step of immersing the chemically strengthened glass plate in a third etching solution for secondary healing; and A method for manufacturing a display device comprising the step of filling resin into the slit of the second healed glass plate.

16. In Paragraph 15, A method for manufacturing a display device in which the etching rate of the glass plate by the second etching solution is slower than the etching rate of the glass plate by the first etching solution.

17. In Paragraph 15, A method for manufacturing a display device in which the second etching solution and the third etching solution contain the same material.

18. In Paragraph 15, The first etching solution and the second etching solution each contain ammonium ions and heavy fluoride ions, and The ratio of ammonium ions to total ions in the first etching solution is smaller than the ratio of ammonium ions to total ions in the second etching solution, and A method for manufacturing a display device in which the ratio of heavy fluoride ions to total ions in the first etching solution is greater than the ratio of heavy fluoride ions to total ions in the second etching solution.

19. In Paragraph 15, The above slit includes a first portion adjacent to the upper surface of the glass plate, a second portion adjacent to the lower surface of the glass plate, and a third portion disposed between the first portion and the second portion in the thickness direction of the glass plate. A method for manufacturing a display device in which the width of the third part is smaller than the width of the first part, and the width of the first part is smaller than the width of the second part.

20. A display device for displaying images; A processor that provides an image driving signal to the above-mentioned display device; and It includes a power module that supplies power to the above-mentioned display device and the above-mentioned processor, and The above display device is, A display panel including a folding area and a non-folding area; and A panel support member comprising a folding portion disposed on the above-mentioned display panel and a non-folding portion disposed in the above-mentioned folding area and a non-folding portion disposed in the above-mentioned non-folding area, and The above folding part includes a grid pattern in which a plurality of slits and a plurality of bars are alternately arranged, and The panel support member comprises, on a cross-section cut in the thickness direction, a first surface located adjacent to the display panel, a second surface facing the first surface, a first inner surface connected to the first surface within the slit and disposed between the first surface and the second surface and including a curved surface, and a second inner surface disposed between the first inner surface and the second surface within the slit. The point where the first surface and the first inner surface meet is defined as the first point, the point where the second surface and the second inner surface meet is defined as the second point, and the point where the first inner surface and the second inner surface meet is defined as the third point. The above slit has a first width in a direction parallel to the first surface at the first point, a second width in a direction parallel to the second surface at the second point, and a third width, which is a minimum width, in a direction parallel to at least one of the first surface and the second surface at the third point. The third width is smaller than the first width, and the first width is smaller than the second width, A first reference point is defined where a straight line extending in a horizontal direction perpendicular to the thickness direction meets the first inner surface at a point located at a first vertical distance in the thickness direction from the first point, and An electronic device in which, when the first vertical distance is 0.5 μm, the first angle formed by the first tangent line touching the first inner surface at the first reference point with the first surface is 15 degrees or more and 30 degrees or less.

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