Display Device

Abstract

To propose a display device that accomplishes structural safety, durability, and improvement.SOLUTION: A display device comprises: a display panel; a composite material plate to which the display panel is coupled; and a fastening member that is coupled to the composite material plate. The composite material plate includes: a front skin that defines a front surface; a rear skin that defines a rear surface, and faces the front skin; a core that is positioned between the front skin and the rear skin, and includes fibers; and a fastening hole that is formed penetrating through the front skin, the rear skin, and the core. The fastening member includes: a shaft body that is inserted into the fastening hole; and a head that is coupled to the shaft body, and pushed into any one of the front skin and the rear skin. One of the front skin and the rear skin contacts with the lateral surface of the head. Thus, the problem is solved by the display device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to display devices.

[0002] [Related Technology] This application claims priority under Article 4 of Korean Patent Application No. 10-2023-0141136 (filing date: October 20, 2023; DAS Code: FA26), and the present invention is based on the disclosures in that Korean patent application. For reference, the contents of the specification, claims, and drawings of that Korean patent application are incorporated herein by reference. [Background technology]

[0003] With the development of the information society, the demand for display devices has increased in various forms, and in response to this, various display devices such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), ELD (Electroluminescent Display), VFD (Vacuum Fluorescent Display), and OLED (Organic Light Emitting Diode) have been researched and used recently.

[0004] Among these, display devices using organic light emitting diodes (OLEDs) have advantages over LCD devices in terms of brightness and viewing angle, and can be implemented in an ultra-thin form since they do not require a backlight unit.

[0005] In recent years, much research has been conducted to ensure the rigidity and structural integrity of large-screen and ultra-thin display devices. Summary of the Invention [Problem to be solved by the invention]

[0006] The present disclosure is directed to solving the above-mentioned problems and other problems.

[0007] Another object of the present disclosure is to ensure structural rigidity for large screen and ultra-thin display devices.

[0008] Yet another object of the present disclosure is to ensure the structural integrity of the display device.

[0009] Yet another object of the present disclosure is to improve the flatness of the frame of a display device.

[0010] Yet another object of the present disclosure is to improve the coupling structure of a display device.

[0011] It is yet another object of the present disclosure to improve the durability and safety of the bond between the composite panel and the fastener. [Means for solving the problem]

[0012] In order to achieve the above-mentioned object, a display device according to one aspect of the present disclosure includes (has; constitutes; constructs; sets; encloses; contains; contains) a display panel, a composite material plate to which the display panel is coupled, and a fastening member coupled to the composite material plate, wherein the composite material plate includes a front skin forming a front surface, a rear skin forming a rear surface and facing the front skin, a core located between the front skin and the rear skin and including fibers, and fastening holes formed through the front skin, the rear skin, and the core, and the fastening member includes a shaft body inserted into the fastening hole, and a head connected to the shaft body and pressed into either the front skin or the rear skin, and either the front skin or the rear skin contacts a side of the head.

[0013] [Preferred embodiment of the present invention] In the present invention, the following preferred embodiments can be proposed. [Claim 1] 1. A display device, comprising: a display panel; a composite material plate to which the display panel is bonded; a fastening member coupled to the composite plate; The composite material plate is A front skin that forms the front surface; a rear skin forming a rear surface and facing the front skin; a core located between the front skin and the rear skin and including fibers; fastening holes formed through the front skin, the rear skin, and the core; The fastening member is a shaft body inserted into the fastening hole; a head connected to the shaft body and pressed into either the front skin or the rear skin; A display device, wherein either the front skin or the rear skin contacts a side of the head. [Claim 2] The fastening member further includes a neck connecting the shaft body and the head, The display device of claim 1 , wherein one of the front skin or the rear skin is pressed toward the neck between the head and the shaft body. [Claim 3] the fastener is generally cylindrical; the diameter of the head is greater than the diameter of the shaft body; The display device of claim 2 , wherein the diameter of the shaft body is greater than the diameter of the neck. [Claim 4] The head a first head portion connected to the neck; a second head portion connected to the first head portion and forming a top surface of the voting member; The display device of claim 3 , wherein the diameter of the second head portion is larger than the diameter of the first head portion. [Claim 5] the head includes a step portion formed on the first head portion and the second head portion, The display device according to claim 4 , wherein one of the front skin or the rear skin contacts the step portion. [Claim 6] The display device of claim 5 , wherein the core is compressed adjacent the head portion, and the thickness of the core increases radially along the shaft body. [Claim 7] 4. The display device of claim 3, wherein the front skin, the rear skin, and the core are pressed toward the neck between the head portion and the shaft body and contact at least one of the underside of the head, the side of the neck, or the top surface of the shaft body. [Claim 8] The thickness of the first head portion is greater than the thickness of the second head portion, The display device of claim 4 , wherein the neck has a thickness greater than a thickness of the first head portion. [Claim 9] The fastening member further includes a shaft hole formed by removing an interior portion of the shaft body in the longitudinal direction of the shaft body from an end surface of the shaft body that forms a bottom surface of the fastening member, The display device of claim 8 , wherein the length of the axle body is greater than the length of the axle hole. [Claim 10] The head of the fastening member is pressed into the front skin, The composite material panel is a first press portion formed by depressing the front skin around the head of the fastening member; a second press portion formed by depressing the rear skin around the shaft body of the fastening member, The display device of claim 1 , wherein the depth of the second pressing portion is greater than the depth of the first pressing portion. [Claim 11] 11. The display device of claim 10, wherein an outer surface of the head is flush with an outer surface of a front skin forming the first press portion. [Claim 12] The diameter of the shaft body corresponds to the diameter of the fastening hole; The display device of claim 1 , wherein the diameter of the head is greater than the diameter of the shaft body. [Claim 13] The display device of claim 2 , wherein the neck has a thickness greater than the head thickness. [Claim 14] The display device of claim 2 , wherein the neck has a thickness less than the head. [Claim 15] The display device of claim 1 , wherein the fastener is a PEM nut. [Effects of the Invention]

[0014] The effects of the display device according to the present disclosure are as follows.

[0015] According to at least one of the embodiments of the present disclosure, the structural rigidity of large-screen and ultra-thin display devices can be ensured.

[0016] According to at least one of the embodiments of the present disclosure, the structural safety of the display device can be ensured.

[0017] According to at least one of the embodiments of the present disclosure, the flatness of the frame of the display device can be improved.

[0018] According to at least one of the embodiments of the present disclosure, the coupling structure of a display device can be improved.

[0019] According to at least one of the embodiments of the present disclosure, the durability and safety of the connection structure between the composite material panel and the fastening member can be improved.

[0020] Further scope of applicability of the present disclosure will become apparent from the following detailed description. However, since various changes and modifications within the spirit and scope of the present disclosure will be apparent to those skilled in the art, it should be understood that the detailed description and specific examples, such as preferred embodiments of the present disclosure, are given by way of example only. [Brief explanation of the drawings]

[0021] [Figure 1-49] FIG. 1 illustrates an example of a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. The same or similar components are given the same reference numerals even if they are shown in different drawings, and redundant description thereof will be omitted.

[0023] The suffixes "module" and "section" used in the following description for components are used solely for the convenience of explanation of the specification, and do not have any meanings or roles that are distinct from each other.

[0024] In the following description of the embodiments disclosed herein, detailed descriptions of related known technologies may be omitted if they may obscure the gist of the embodiments disclosed herein. In addition, the accompanying drawings are provided to facilitate understanding of the embodiments disclosed herein, and should not be construed as limiting the technical ideas disclosed in the present specification, but should be interpreted as including all modifications, equivalents, and alternatives included in the spirit and scope of the present disclosure.

[0025] Terms including ordinal numbers such as first, second, etc. may be used to describe various components, but it should be understood that the components are not limited by the terms. The terms are used only to distinguish one component from another.

[0026] When a component is said to be "coupled" or "connected" to another component, it can be understood that the component may be directly coupled or connected to the other component, but that there may be other components in between. On the other hand, when a component is said to be "directly coupled" or "directly connected" to another component, it can be understood that there are no other components in between.

[0027] The singular expression includes the plural expression unless the context clearly dictates otherwise.

[0028] The embodiments will be described with reference to certain drawings, but where necessary, reference numerals not shown in the particular drawings may be mentioned, and reference numerals not shown in the particular drawings will be used when the reference numerals are shown in other drawings.

[0029] 1, a display device 100 may include a display panel 110. The display panel 110 may display an image.

[0030] The display device 100 may include a first long side LS1, a second long side LS2 opposite to the first long side LS1, a first short side SS1 adjacent to the first long side LS1 and the second long side LS2, and a second short side SS2 opposite to the first short side SS1.

[0031] For ease of explanation, the lengths of the first and second long sides LS1, LS2 are shown and described as being longer than the lengths of the first and second short sides SS1, SS2, but the lengths of the first and second long sides LS1, LS2 may also be approximately the same as the lengths of the first and second short sides SS1, SS2.

[0032] A direction parallel to the long sides LS1 and LS2 of the display device 100 is referred to as a first direction DR1 or a left-right direction LR, and a direction parallel to the short sides SS1 and SS2 of the display device 100 is referred to as a second direction DR2 or a up-down direction UD.

[0033] A direction perpendicular to the long sides LS1 and LS2 and the short sides SS1 and SS2 of the display device 100 is referred to as a third direction DR3 or a front-rear direction FR. Here, the direction in which the display panel 110 displays an image is referred to as the front, and the opposite direction is referred to as the rear.

[0034] Hereinafter, the display panel 110 will be described as an example using an organic light emitting diode (OLED), but the display panel 110 applicable to the present disclosure is not limited to this.

[0035] The display panel 110 forms the front surface of the display device 100 and can display an image in front of it. The display panel 110 can divide an image into a plurality of pixels and output the image by combining hue, brightness, and saturation for each pixel. The display panel 110 can be divided into an active area that displays an image and a de-active area that does not display an image. The display panel 110 can generate light corresponding to red, green, or blue in response to a control signal.

[0036] 2, the composite panel 130 may include a core 131, a front skin 132, and a rear skin 133. The core 131, the front skin 132, and the rear skin 133 may be bonded to one another. The composite panel 130 may be referred to as a fiber complexed panel 130, a fiber complexed plate 130, a composite plate 130, or a middle frame 130.

[0037] The front skin 132 may form the front surface of the composite material panel 130. The rear skin 133 may form the rear surface of the composite material panel 130. The front skin 132 and the rear skin 133 may include a metal material.

[0038] For example, the front skin 132 and the rear skin 133 may be galvanized iron. As another example, the front skin 132 and the rear skin 133 may include aluminum (Al).

[0039] For example, the thickness of the front skin 132 and the rear skin 133 may be 0.2 to 0.5 mm. As another example, the thickness of the front skin 132 and the rear skin 133 made of galvanized iron plate may be 0.27 mm. As another example, the thickness of the front skin 132 and the rear skin 133 made of aluminum may be 0.5 mm.

[0040] The front skin 132 and the rear skin 133 may face each other with the core 131 (described later) as the base. The core 131 may be located between the front skin 132 and the rear skin 133. The core 131 may include fibers. The core 131 may be formed of a composite material. The core 131 may include main fibers and binder fibers. The binder fibers may be mixed between the main fibers.

[0041] The front skin 132 and / or the rear skin 133 may be bonded to the core 131 by a hot melt method. A hot melt sheet may be positioned between the front skin 132 and the core 131, and another hot melt sheet may be positioned between the rear skin 133 and the core 131. The hot melt sheet may be a film. For example, the hot melt sheet may be a film of EVA, acrylic, polyurethane, or the like having a thickness of 50 μm or more. After the core 131 is positioned between the front skin 132 and the rear skin 133 by the hot melt sheet, they may be joined by rolling at 190°C for 1 minute or more.

[0042] Therefore, the bending and / or torsional rigidity of the display device can be improved.

[0043] Referring to Figures 3 and 4, the composite material panel 130 can be manufactured by a process of pressing a front skin 132 and a rear skin 133 onto a core 131 using multiple rollers, which can be called a roll-to-roll process.

[0044] Referring to FIG. 3, the rotation of the pinch roller Ra, which functions as a drive motor, causes the front skin 132 to unwind from the front drum Da, the rear skin 133 to unwind from the rear drum Db, and the core 131 to move via the feeding roller Rd. Then, the first adhesive 134a for bonding the front skin 132 to the core 131 can be unwound from the first drum Dc. The second adhesive 134b for bonding the rear skin 133 to the core 131 can be unwound from the second drum Db. In this case, the front skin 132, the first adhesive 134a, the core 131, the second adhesive 134b, and the rear skin 133 are stacked in this order and guided toward the oven Ov by the guide roller Rc. The adhesives 134a and 134b may be hot-melt sheets 134a and 134b.

[0045] The first and second adhesives 134a and 134b melt in the oven Ov, and the front skin 132 and the rear skin 133 can be bonded to the core 131. For example, the melting points of the first and second adhesives 134a and 134b can be about 150°C, and the ambient temperature of the oven Ov can be about 200°C. For example, the peel-off force of the first and second adhesives 134a and 134b can be about 10 kgf or more. The front skin 132, core 131, and rear skin 133 that have passed through the oven Ov are guided to the pressing roller Rb by the rotation of the pinch roller Ra, and are pressed by the pressing roller Rb. This increases the bonding force between the front skin 132, core 131, and rear skin 133. After passing through the pinch roller Ra, the bonded front skin 132, core 131, and rear skin 133 are cut by the cutter Ct to produce a composite material panel 130 of a certain size.

[0046] 4, the pressure roller Rb or the pinch roller Ra may contact the outer surfaces of the front skin 132 and the rear skin 133. When the pressure roller Rb or the pinch roller Ra rotates, the composite material panel 130 may move in the longitudinal direction (i.e., the left-right direction LR) of the core 131. Here, the front skin 132 and the rear skin 133 may be sequentially joined from one end of the core 131 to the other end in the longitudinal direction of the core 131.

[0047] In addition, the front skin 132 and the rear skin 133 of the composite material panel 130 may be formed flat. That is, since the rear surface of the rear skin 133 forming the rear surface of the display device 100 is formed flat, additional work such as coating or attaching a sheet to the rear surface of the rear skin 133 can be easily performed to improve the appearance.

[0048] Meanwhile, in addition to forming the front skin 132 and the rear skin 133 flat using the roll-to-roll process described above with reference to Figures 3 and 4, it is also possible to combine the core 131, the front skin 132, and the rear skin 133 using a process in which the front skin 132, the core 131, and the rear skin 133 are stacked in order and then combined.

[0049] Referring to FIG. 5, the composite material panel 130 may include a flat plate portion 130P, a receiving portion 137, and an outer part 135. The outer part 135 may be formed around the flat plate portion 130P. The first outer part 135a may be formed along the upper side of the flat plate portion 130P, the second outer part 135b may be formed along the left side of the flat plate portion 130P, the third outer part 135c may be formed along the lower side of the flat plate portion 130P, and the fourth outer part 135d may be formed along the right side of the flat plate portion 130P. The outer part 135 may be formed by pressing the flat plate portion 130P. The outer part 135 may be lowered from the flat plate portion 130P to form a step portion. The thickness of the flat plate portion 130P may be greater than the thickness of the outer part 135.

[0050] The cable hole 136 may be formed through the front skin 132 (see FIG. 2) and the rear skin 133 (see FIG. 2) of the receiving portion 137. The cable hole 136 may be formed in the receiving portion 137 adjacent to the lower side of the flat portion 130P. There may be a plurality of cable holes 136. The first cable hole 136a may be located close to the second cable hole 136b.

[0051] The receiving portion 137 may be formed adjacent to the lower side of the flat plate portion 130P between the flat plate portion 130P and the third outer part 135c. There may be a plurality of receiving portions 137. The first receiving portion 137a may be located between the first cable hole 136a and the second short side SS2. The second receiving portion 137b may be located between the second cable hole 136b and the first short side SS1. The receiving portion 137 may be formed by pressing the flat plate portion 130P. The receiving portion 137 may be lowered from the flat plate portion 130P and / or the outer part 135c to form a step portion.

[0052] 6, the accommodating portion 137 may be formed by pressing the flat plate portion 130P. The front skin 132 of the accommodating portion 137 may be lowered from the front skin 132 of the flat plate portion 130P to form a step portion D1. The rear skin 133 of the accommodating portion 137 may be higher from the rear skin 133 of the flat plate portion 130P to form a step portion D2. Here, the height of the step portion D1, which is lowered from the front skin 132 of the flat plate portion 130P to the front skin 132 of the accommodating portion 137, may be greater than the height of the step portion D2, which is higher from the rear skin 133 of the flat plate portion 130P to the rear skin 133 of the accommodating portion 137. The thickness T1 of the flat plate portion 130P may be greater than the thickness T2 of the accommodating portion 137.

[0053] When pressed in the direction from the front skin 132 of the flat plate portion 130P to the rear skin 133, the core 131 of the composite material panel 130 can absorb the external force. The magnitude of the external force acting on the front skin 132 of the flat plate portion 130P may be greater than the magnitude of the external force acting on the rear skin 133 of the flat plate portion 130P. The core 131 of the composite material panel 130 not only ensures rigidity but also absorbs impact.

[0054] The thickness T4 of the third outer part 135c may be greater than the thickness T2 of the accommodating portion 137. A step portion D2 may be formed by increasing the height from the rear skin 133 of the third outer part 135c to the rear skin 133 of the accommodating portion 137. The height of the step portion D2 between the rear skin 133 of the third outer part 135c and the rear skin 133 of the accommodating portion 137 may be the same as the height of the step portion D2 between the rear skin 133 of the accommodating portion 137 and the rear skin 133 of the flat plate portion 130P.

[0055] The protruding pad 138 may protrude from the front skin 132 of the third outer part 135c. The front skin 132 of the protruding pad 138 may be lower than the front skin 132 of the third outer part 135c to form a step D4. The height of the step D4 formed by the third outer part 135c and the protruding pad 138 may be smaller than the heights of the steps D1 and D2 formed by the flat plate portion 130P and the accommodating portion 137. A step D3 may be formed by lowering the front skin 132 of the protruding pad 138 to the front skin 132 of the accommodating portion 137. The thickness T3 of the protruding pad 138 may be larger than the thickness T4 of the third outer part 135c, smaller than the thickness T1 of the flat plate portion 130P, and smaller than the thickness T2 of the accommodating portion 137.

[0056] The fastening recess H may protrude from the rear skin 133 of the receiving portion 137. The fastening recess H may be recessed from the front skin 132 of the receiving portion 137 and protrude from the rear skin 133 of the receiving portion 137. The center of the fastening recess H may be formed through.

[0057] 7 and 8, the fastening recess H may be formed in the flat plate portion 130P. The fastening recess H may be formed by pressing the flat plate portion 130P. The front skin 132 of the fastening recess H may be formed by being recessed from the front skin 132 of the flat plate portion 130P. The rear skin 133 of the flat plate portion 130P and the rear skin 133 of the fastening recess H may be flush with each other. The thickness T0 of the fastening recess H may be smaller than the thickness T1 of the flat plate portion 130P.

[0058] The fastening hole h may be formed in the center of the fastening recess H. The fastening hole h may be formed by punching the fastening recess H. The fastening hole h may be formed through the front skin 132 and the rear skin 133 of the fastening recess H. The length of the shaft SA of the fastening member S may be greater than the thickness T0 of the fastening recess H. The shaft SA of the fastening member S may be inserted into the fastening recess H and protrude outside the rear skin 133 of the fastening recess H through the fastening hole h. The depth D5 of the fastening recess H may be greater than the thickness of the head SH. The head SH of the fastening member S may be hidden by the fastening recess H.

[0059] 9 and 10 together with FIG. 8, a PCB plate 150 may be coupled to the rear side of the composite panel 130. The PCB plate 150 may be secured to the rear side of the composite panel 130 by fasteners S.

[0060] The PCB plate 150 may be formed by pressing a plate 151 containing metal. The PCB plate 150 may include a horizontal portion 152, a vertical portion 153, a dome portion 154, and a recessed portion 155. The horizontal portion 152 may protrude from the front side of the PCB plate 151 to the rear side and extend long in the left-right direction of the PCB plate 151. The vertical portion 153 may protrude from the front side of the PCB plate 151 to the rear side and extend long in the up-down direction of the PCB plate 150. The dome portion 154 may protrude from the front side of the PCB plate 150 to the rear side. The recessed portion 155 may be recessed from the rear side of the vertical portion 153 and / or the horizontal portion 152 to the front side.

[0061] The shaft SA of the fastening member S can penetrate through a recess 155 formed in the vertical portion 153 and / or the horizontal portion 152 to connect the composite material panel 130 and the PCB plate 150. The depth of the recess 155 can be greater than the protruding length of the shaft SA of the fastening member S that penetrates the composite material panel 130 and protrudes rearward.

[0062] 11 and 12, the side frame 140 may be coupled to the outer part 135 (see FIG. 5) adjacent to the flat plate portion 130P. The side frame 140 may include a first part 141, a second part 142, a third part 143, a fourth part 144, and a fifth part 145. The second part 142 may bend from the first part 141 at a first corner C1.

[0063] The first part 141 may include a horizontal portion 141H and a vertical portion 141V. The horizontal portion 141H of the first part 141 may be fixed on the first outer part 135a (see FIG. 5). The second part 142 may include a horizontal portion 142H and a vertical portion 142V. The horizontal portion 142H of the second part 142 may be fixed on the fourth outer part 135d (see FIG. 5).

[0064] A gap G1 may be formed between the horizontal portion 141H of the first part 141 and the horizontal portion 142H of the second part 142. The vertical portion 141V of the first part 141 and the vertical portion 142V of the second part 142 may be connected while bending. A hole H1 connected to the gap G1 may be formed between the horizontal portions 141H and 142H adjacent to the vertical portions 141V and 142V. The size or diameter of the hole H1 may be larger than the width of the gap G1. The description of the first corner C1 of the side frame 140 also applies to the second corner C2 of the side frame 140.

[0065] 11 and 13, the side frame 140 may be coupled to the outer part 135 (see FIG. 5) adjacent to the flat plate portion 130P. The side frame 140 may include a first part 141, a second part 142, a third part 143, a fourth part 144, and a fifth part 145. The second part 142 may bend from the third part 143 at a third corner C3.

[0066] The third part 143 may include a horizontal portion 143H and a vertical portion 143V. The horizontal portion 143H of the third part 143 may be fixed on the third outer part 135c (see FIG. 5). The second part 142 may include a horizontal portion 142H and a vertical portion 142V. The horizontal portion 142H of the second part 142 may be fixed on the fourth outer part 135d (see FIG. 5).

[0067] A gap G3 may be formed between the horizontal portion 143H of the third part 143 and the horizontal portion 142H of the second part 142. The vertical portion 143V of the third part 143 and the vertical portion 142V of the second part 142 may be connected to each other while bending. A hole H3 may be formed adjacent to the vertical portions 143V, 142V between the horizontal portions 143H, 142H and connected to the gap G3. The size or diameter of the hole H3 may be larger than the width of the gap G3. The description of the third corner C3 of the side frame 140 also applies to the fourth corner C4 of the side frame 140.

[0068] 11 and 14, the third part 143 and the fourth part 144 of the side frame 140 may be positioned on or fixed to the third outer part 135c. An end of the third part 143 of the side frame 140 may be connected to an end of the fourth part 144 of the side frame 140.

[0069] The horizontal portion 144H of the fourth part 144 can be in contact with the horizontal portion 143H and the vertical portion 143V of the third part 143. The vertical portion 144V of the fourth part 144 can be in contact with the vertical portion 143V of the third part 143. The vertical portion 143V of the third part 143 can be in contact with the horizontal portion 144H and the vertical portion 144V of the fourth part 144. An end of the third part 143 can be fixed to an end of the fourth part 144. For example, the end of the third part 143 and the end of the fourth part 144 can be fixed by welding.

[0070] 15 , the display panel 110 may be coupled or fixed onto a side frame 140. A horizontal portion 143H of the side frame 140 may support the rear surface of the display panel 110, and a vertical portion 143V may cover the side surface of the display panel 110. For example, the vertical portion 143V of the third part 143 of the side frame 140 may cover the side surface of the lower edge of the display panel 110.

[0071] The vertical portion 143V may cover a side surface of the composite panel 130. For example, the vertical portion 143V of the third part 143 of the side frame 140 may cover a side surface of the third outer part 135c of the composite panel 130.

[0072] The flexible cable 113 may extend from the lower edge of the display panel 110 between the display panel 110 and the horizontal portion 143H of the side frame 140. The flexible cable 113 may extend between the rear surface of the display panel 110 and the composite material panel 130. For example, the flexible cable 113 may be a COF 113.

[0073] The source signal board 115 may be electrically connected to the flexible cable 113. The source signal board 115 may be fixed to one side of the flexible cable 113. For example, the source signal board 115 may be an S-PCB 115. The source signal board 115 may be located in the receiving portion 137 of the composite material panel 130.

[0074] The flexible cable 113 may be located between the protruding pads 138 of the composite panel 130 and the display panel 110. The flexible cable 113 may be in contact with the protruding pads 138. Heat generated in the source signal substrate 115 and / or the flexible cable 113 may be dissipated through the protruding pads 138.

[0075] A thermal pad 114 may be located between the flexible cable 113 in contact with the protruding pad 138 and the rear surface of the display panel 110. The thermal pad 114 may include an elastic material 114a and a conductive film 114b. The core 114a of the thermal pad 114 may be made of an elastic material, and the conductive film 114b may cover the core 114a of the thermal pad 114. This allows the flexible cable 113 to maintain contact with the protruding pad 138.

[0076] 16 and 17, inner frames 210, 230 may be formed on the front and / or rear surfaces of the composite material panel 130. The inner frames 210, 230 may be referred to as pressed frames 210, 230 or rigid lines 210, 230. The inner frames 210, 230 may be formed by pressing the front skin 132 and / or rear skin 133 of the composite material panel 130 and compressing the core 131 (see FIG. 2).

[0077] The inner frames 210, 230 may include a front inner line 210, a rear inner line 230, and a node hole 220. The front inner line 210 may be formed by recessing a front skin 132 of the composite material panel 130. The rear inner line 230 may be formed by recessing a rear skin 133 of the composite material panel 130.

[0078] The front inner line 210 may include a first front horizontal line 211, a second front horizontal line 212, a third front horizontal line 213, a first front vertical line 214, and a second front vertical line 215. The first front horizontal line 211 may form an upper edge of the front inner line 210. The third front horizontal line 213 may form a lower edge of the front inner line 210. The second front horizontal line 212 may be located between the first front horizontal line 211 and the third front horizontal line 213. The first front vertical line 214 may connect one end of the first front horizontal line 211, one end of the second front horizontal line 212, and one end of the third front horizontal line 213. The second front vertical line 215 may connect the other end of the first front horizontal line 211, the other end of the second front horizontal line 212, and the other end of the third front horizontal line 213. For example, the first distance L1 between the first front horizontal line 211 and the second front horizontal line 212 may be smaller than the second distance L2 between the second front horizontal line 212 and the third front horizontal line 213.

[0079] The node holes 220 may be formed at the intersections of the front horizontal lines 211, 212, 213 and the front vertical lines 214, 215. The node holes 220 may be formed through the front skin 132, the core 131, and the rear skin 133 of the composite panel 130.

[0080] The rear inner line 230 may include a first rear horizontal line 231, a second rear horizontal line 232, a third rear horizontal line 233, a first rear vertical line 234, and a second rear vertical line 235 (see FIG. 24). The first rear horizontal line 231 may form an upper side of the rear inner line 230. The third rear horizontal line 233 may form a lower side of the rear inner line 230. The second rear horizontal line 232 may be located between the first rear horizontal line 231 and the third rear horizontal line 233. The first rear vertical line 234 may connect one end of the first rear horizontal line 231, one end of the second rear horizontal line 232, and one end of the third rear horizontal line 233. The second rear vertical line 235 (see FIG. 24) may connect the other end of the first rear horizontal line 231, the other end of the second rear horizontal line 232, and the other end of the third rear horizontal line 233. For example, the third distance L3 between the first rear horizontal line 231 and the second rear horizontal line 232 may be smaller than the fourth distance L4 between the second rear horizontal line 232 and the third rear horizontal line 233.

[0081] The node holes 220 may be formed at the intersections of the rear horizontal lines 231, 232, and 233 and the rear vertical lines 234 and 235. The node holes 220 may be formed through the front skin 132, the core 131, and the rear skin 133 of the composite panel 130.

[0082] The length of the rear inner line 230 may be smaller than the length of the PCB plate 150. The width of the rear inner line 230 may be smaller than the width of the PCB plate 150. The PCB plate 150 may cover the rear inner line 230.

[0083] Therefore, the bending rigidity and / or torsional rigidity of the composite material panel 130 can be improved.

[0084] 18 , there may be a plurality of node holes 220. The plurality of node holes 220 may include a first node hole 221, a second node hole 222, a third node hole 223, a fourth node hole 224, a fifth node hole 225, and a sixth node hole 226.

[0085] The first node hole 221 may be located at a corner C2 formed by the first horizontal lines 211, 231 and the first vertical lines 214, 234. The first node hole 221 may be formed through the composite material panel 130 at the corner C2 between the first horizontal lines 211, 231 and the first vertical lines 214, 234.

[0086] The second node hole 222 may be located at the corner C1 formed by the first horizontal lines 211, 231 and the second vertical lines 212, 232. The second node hole 222 may be formed through the composite panel 130 at the corner C1 between the first horizontal lines 211, 231 and the second vertical lines 212, 232.

[0087] The third node hole 223 may be located at a node M2 ​​formed by the second horizontal lines 212, 232 and the first vertical lines 214, 234. The third node hole 223 may be formed through the composite panel 130 at the node M2 ​​between the second horizontal lines 212, 232 and the first vertical lines 214, 234.

[0088] The fourth node hole 224 may be located at a node M1 formed by the second horizontal lines 212, 232 and the second vertical lines 212, 232. The fourth node hole 224 may be formed through the composite panel 130 at the node M1 between the second horizontal lines 212, 232 and the second vertical lines 212, 232.

[0089] The fifth node hole 225 may be located at a corner C4 formed by the third horizontal lines 213, 233 and the first vertical lines 214, 234. The fifth node hole 225 may be formed through the composite panel 130 at the corner C4 between the third horizontal lines 213, 233 and the first vertical lines 214, 234.

[0090] The sixth node hole 226 may be located at the corner C3 formed by the third horizontal lines 213, 233 and the second vertical lines 212, 232. The sixth node hole 226 may be formed through the composite panel 130 at the corner C3 between the third horizontal lines 213, 233 and the second vertical lines 212, 232.

[0091] Therefore, not only can the bending rigidity and / or torsional rigidity of the composite material panel 130 be improved, but also the flatness of the display panel 110 bonded to the composite material panel 130 can be improved.

[0092] 19 , the size of the sixth node hole 226 may be larger than the width of the third horizontal lines 213, 233 and / or the second vertical lines 215, 235. For example, if the sixth node hole 226 is rectangular, the widths A, B of the sixth node hole 226 may be larger than the width W of the third horizontal lines 213, 233 and / or the second vertical lines 215, 235. As another example, if the sixth node hole 226 is circular, the diameter of the sixth node hole 226 may be larger than the width of the third horizontal lines 213, 233 and / or the second vertical lines 215, 235. The description of the sixth node hole 226 can be similarly applied to the first node hole 221, the second node hole 222, and / or the fifth node hole 225.

[0093] 20 , the size of the fourth node hole 224 may be larger than the width of the second horizontal lines 212, 232 and / or the second vertical lines 215, 235. For example, if the fourth node hole 224 is rectangular, the widths A and B of the fourth node hole 224 may be larger than the width of the second horizontal lines 212, 232 and / or the second vertical lines 215, 235. As another example, if the fourth node hole 224 is circular, the diameter of the fourth node hole 224 may be larger than the width of the second horizontal lines 212, 232 and / or the second vertical lines 215, 235. The description of the fourth node hole 224 can be similarly applied to the third node hole 223.

[0094] 21, the front inner line 210 may be formed on the composite material panel 130 by compressing the core 131 and collapsing the front skin 132. The rear inner line 230 may be formed on the composite material panel 130 by compressing the core 131 and collapsing the rear skin 133.

[0095] The front inner line 210 and the rear inner line 230 may be symmetrical with respect to the core 131. For example, the width W of the front inner line 210 may be substantially the same as the width W of the rear inner line 230. As another example, the depth D10 of the front inner line 210 may be substantially the same as the depth D11 of the rear inner line 230.

[0096] A compressed area PA in which the core 131 is compressed may be formed between the front inner line 210 and the rear inner line 230. The density of the core 131 in the compressed area PA may be greater than the density of the core 131 in the non-compressed area.

[0097] Therefore, the bending rigidity and / or torsional rigidity of the composite material panel 130 can be improved.

[0098] 22, the adhesive member AD may be disposed on the flat plate portion 130P of the composite material panel 130. The adhesive member AD may be adhered to the front skin 132 of the composite material panel 130. There may be multiple adhesive members AD.

[0099] The first adhesive member AD1 may be fixed to the first part 141 of the side frame 140. The first adhesive member AD1 may extend longitudinally along the first part 141 of the side frame 140. The second adhesive member AD2 may extend longitudinally along the second part 142 of the side frame 140 and be fixed to the second part 142. The third adhesive member AD3 may extend longitudinally along the second part 142 of the side frame 140, be parallel to the second part 142, and be fixed to the flat plate portion 130P at a distance from the first adhesive member AD1.

[0100] The fifth adhesive member AD5 may extend longitudinally along the fifth part 145 of the side frame 140 and be fixed to the fifth part 145. The fourth adhesive member AD4 may extend longitudinally along the fifth part 145 of the side frame 140, be parallel to the fifth part 145, and be fixed to the flat plate portion 130P at a distance from the fifth adhesive member AD5.

[0101] The sixth adhesive member AD6 may extend longitudinally along the first part 141 of the side frame 140 and be fixed to the flat plate portion 130P at a distance from the first adhesive member AD1. A fourteenth distance G14 from the first part 141 of the side frame 140 to the sixth adhesive member AD6 may be smaller than a fifteenth distance G15 from the sixth adhesive member AD6 to the first front horizontal inner line 211.

[0102] The seventh adhesive member AD7 may extend along the longitudinal direction of the sixth adhesive member AD6 and be fixed to the flat plate portion 130P between the first front vertical line 214 and the fourth adhesive member AD4. The seventh adhesive member AD7 may be located between the sixth adhesive member AD6 and the ninth adhesive member AD9. A sixteenth distance G16 from the fourth adhesive member AD4 to one end of the seventh adhesive member AD7 may be smaller than a seventeenth distance G17 from the first front vertical line 214 to the other end of the seventh adhesive member AD7.

[0103] The ninth adhesive member AD9 may extend along the longitudinal direction of the sixth adhesive member AD6 and be fixed to the flat plate portion 130P between the first front vertical line 214 and the fourth adhesive member AD4. The ninth adhesive member AD9 may be located between the seventh adhesive member AD7 and the receiving portion 137. An eighteenth distance G18 from the fourth adhesive member AD4 to one end of the ninth adhesive member AD9 may be smaller than a nineteenth distance G19 from the first front vertical line 214 to the other end of the ninth adhesive member AD9.

[0104] The eighth adhesive member AD8 may extend along the longitudinal direction of the sixth adhesive member AD6 and be fixed to the flat plate portion 130P between the second front vertical line 215 and the third adhesive member AD3. The eighth adhesive member AD8 may be located between the sixth adhesive member AD6 and the receiving portion 137. A twentieth distance G20 from the third adhesive member AD3 to one end of the eighth adhesive member AD8 may be smaller than a twentieth distance G21 from the second front vertical line 215 to the other end of the eighth adhesive member AD8.

[0105] The tenth adhesive member AD10 may extend along the longitudinal direction of the sixth adhesive member AD6 and be fixed to the flat plate portion 130P between the second front vertical line 215 and the third adhesive member AD3. The tenth adhesive member AD10 may be located between the eighth adhesive member AD8 and the receiving portion 137. A 22nd distance G22 from the third adhesive member AD3 to one end of the tenth adhesive member AD10 may be smaller than a 23rd distance G23 from the second front vertical line 215 to the other end of the tenth adhesive member AD10.

[0106] The eleventh adhesive member AD11 may extend along the longitudinal direction of the second front horizontal line 212 and be fixed to the flat plate portion 130P between the second front horizontal line 212 and the third front horizontal line 213. The twelfth adhesive member AD12 may extend along the longitudinal direction of the second front horizontal line 212 and be located between the first front horizontal line 211 and the second front horizontal line 212. The length of the twelfth adhesive member AD12 may be shorter than the length of the eleventh adhesive member AD11.

[0107] The tenth distance G10 between the first front horizontal line 211 and the twelfth adhesive member AD12 may be smaller than the eleventh distance G11 between the twelfth adhesive member AD12 and the second front horizontal line 212. For example, the tenth distance G10 may be 40 mm or more. For example, the distance between one end of the twelfth adhesive member AD12 and the first vertical front line 214 may be 20 mm. As another example, the distance between the other end of the twelfth adhesive member AD12 and the second vertical front line 215 may be 20 mm or more.

[0108] A twelfth distance G12 between the second front horizontal line 212 and the eleventh adhesive member AD11 may be greater than a thirteenth distance G13 between the eleventh adhesive member AD11 and the third front horizontal line 213. For example, the thirteenth distance G13 may be 40 mm or greater.

[0109] The adhesive member AD can bond or fasten the display panel 110 to the composite panel 130. Thus, the display panel 110 can be flatly fastened to the composite panel 130.

[0110] 23 and 24, the composite material panel 130 may include a flat plate portion 130P, a receiving portion 137, and an outer part 135. The outer part 135 may be formed around the flat plate portion 130P to form the edge of the composite material panel 130. The first outer part 135a may be formed along the upper side of the flat plate portion 130P, the second outer part 135b may be formed along the left side of the flat plate portion 130P, the third outer part 135c may be formed along the lower side of the flat plate portion 130P, and the fourth outer part 135d may be formed along the right side of the flat plate portion 130P. The outer part 135 may be formed by pressing the flat plate portion 130P. The outer part 135 may be lowered from the flat plate portion 130P to form a step portion. The thickness of the flat plate portion 130P may be greater than the thickness of the outer part 135. The lower side of the flat plate portion 130P can form a curved line.

[0111] The receiving portion 137 may be formed in the third outer part 135c adjacent to the lower side of the flat portion 130P. There may be multiple receiving portions 137. The first receiving portion 137a may be located between the first cable hole 136a and the second short side SS2. The second receiving portion 137b may be located between the second cable hole 136b and the first short side SS1. The first receiving portion 137a may be connected to the second receiving portion 137b. The receiving portion 137 may be formed by pressing the third outer part 135c from the front to the rear. The receiving portion 137 may form a step portion that is lowered from the front surface of the outer part 135c.

[0112] The cable hole 136 may be formed through the front skin 132 (see FIG. 2) and the rear skin 133 (see FIG. 2) of the receiving portion 137. The cable hole 136 may be formed in the receiving portion 137 and / or the third outer part 135c adjacent to the lower side of the flat portion 130P. There may be a plurality of cable holes 136. The first cable hole 136a may be located close to the second cable hole 136b.

[0113] The inner frames 210, 230 may be formed on the front and / or rear surfaces of the composite material panel 130. The inner frames 210, 230 may be referred to as pressed frames 210, 230 or rigid lines 210, 230. The inner frames 210, 230 may be formed by pressing the front skin 132 and / or rear skin 133 of the composite material panel 130 and compressing the core 131 (see FIG. 2).

[0114] The inner frames 210, 230 may include a front inner line 210, a rear inner line 230, and a node hole 220. The front inner line 210 may be formed by recessing a front skin 132 of the composite material panel 130. The rear inner line 230 may be formed by recessing a rear skin 133 of the composite material panel 130.

[0115] The front inner line 210 may include a first front horizontal line 211, a second front horizontal line 212, a third front horizontal line 213, a first front vertical line 214, and a second front vertical line 215. The first front horizontal line 211 may form an upper side of the front inner line 210. The third front horizontal line 213 may form a lower side of the front inner line 210. The second front horizontal line 212 may be located between the first front horizontal line 211 and the third front horizontal line 213. The first front vertical line 214 may connect one end of the first front horizontal line 211, one end of the second front horizontal line 212, and one end of the third front horizontal line 213. The second front vertical line 215 may connect the other end of the first front horizontal line 211, the other end of the second front horizontal line 212, and the other end of the third front horizontal line 213. For example, the first distance L1 between the first front horizontal line 211 and the second front horizontal line 212 may be smaller than the second distance L2 between the second front horizontal line 212 and the third front horizontal line 213.

[0116] Node holes 220 may be formed at the intersections of front horizontal lines 211, 212, 213 and front vertical lines 214, 215. Node holes 220 may be formed through the front skin 132, core 131, and rear skin 133 of composite panel 130.

[0117] The rear inner line 230 may include a first rear horizontal line 231, a second rear horizontal line 232, a third rear horizontal line 233, a first rear vertical line 234, and a second rear vertical line 235. The first rear horizontal line 231 may form an upper side of the rear inner line 230. The third rear horizontal line 233 may form a lower side of the rear inner line 230. The second rear horizontal line 232 may be located between the first rear horizontal line 231 and the third rear horizontal line 233. The first rear vertical line 234 may connect one end of the first rear horizontal line 231, one end of the second rear horizontal line 232, and one end of the third rear horizontal line 233. The second rear vertical line 235 may connect the other end of the first rear horizontal line 231, the other end of the second rear horizontal line 232, and the other end of the third rear horizontal line 233. For example, the third distance L3 between the first rear horizontal line 231 and the second rear horizontal line 232 may be smaller than the fourth distance L4 between the second rear horizontal line 232 and the third rear horizontal line 233.

[0118] The node holes 220 may be formed at the intersections of the rear horizontal lines 231, 232, 233 and the rear vertical lines 234, 235. The node holes 220 may be formed through the front skin 132, the core 131, and the rear skin 133 of the composite panel 130.

[0119] The receiving portion 137 may be formed by pressing the third outer part 135c from the front to the rear. The receiving portion 137 may be elevated from the rear surface of the third outer part 135c to form a step portion.

[0120] A cut-out portion 139 may be formed in at least a portion of a bending line formed along the lower side of the flat plate portion 130P. There may be a plurality of cut-out portions 139. The first cut-out portion 139a may be aligned with the first receiving portion 137a, and the second cut-out portion 139b may be aligned with the second receiving portion 137b. The cut-out portion 139 may be formed in a line where a step is formed between the front surface of the flat plate portion 130P and the third outer part 135c. The cut-out portion 139 may be formed in a line where a step is formed between the third outer part 135c and the receiving portion 137.

[0121] Therefore, not only can the bending rigidity and / or torsional rigidity of the composite material panel 130 be improved, but also the flatness of the composite material panel 130 can be improved.

[0122] 25, the third outer part 135c may be formed by pressing the flat plate portion 130P. The front skin 132 of the third outer part 135c may have a step portion D5 that is lower than the front skin 132 of the flat plate portion 130P.

[0123] The accommodation portion 137 may be formed by pressing the third outer part 135c. The front skin 132 of the accommodation portion 137 may have a step portion D6 that is lower than the front skin 132 of the third outer part 135c.

[0124] The rear skin 133 of the housing portion 137 may be elevated from the rear skin 133 of the third outer part 135c to form a step portion D2. For example, the height of the step portion D6, which decreases from the front skin 132 of the third outer part 135c to the front skin 132 of the housing portion 137, may be smaller than the height of the step portion D2, which increases from the rear skin 133 of the third outer part 135c to the rear skin 133 of the housing portion 137. The thickness T1 of the flat plate portion 130P may be greater than the thickness T2 of the housing portion 137. The thickness T4 of the third outer part 135c may be smaller than the thickness T1 of the flat plate portion 130P. The thickness T2 of the housing portion 137 may be greater than the thickness T4 of the third outer part 135c.

[0125] When pressed in the direction from the front skin 132 of the flat plate portion 130P to the rear skin 133, the core 131 of the composite material panel 130 can absorb the external force. The magnitude of the external force acting on the front skin 132 of the flat plate portion 130P may be greater than the magnitude of the external force acting on the rear skin 133 of the flat plate portion 130P. The core 131 of the composite material panel 130 not only ensures rigidity but also absorbs impact.

[0126] The fastening recess H may protrude from the rear skin 133 of the receiving portion 137. The fastening recess H may be recessed from the front skin 132 of the receiving portion 137 and protrude from the rear skin 133 of the receiving portion 137. The center of the fastening recess H may be formed through.

[0127] 26, the first cutout 139a may include a first slit 139a1 and a second slit 139a2. The first slit 139a1 and / or the second slit 139a2 may extend longitudinally of the receiving portion 137. The first slit 139a1 may be formed at the boundary of the flat plate portion 130P, the boundary of the third outer part 135c, and / or the boundary of the first receiving portion 137a. The second slit 139a2 may be formed close to the first slit 139a1 at the boundary of the flat plate portion 130P, the boundary of the third outer part 135c, and / or the boundary of the first receiving portion 137a.

[0128] The first slit 139a1 may include an upper edge 1391, a left edge 1392, a right edge 1394, and a lower edge 1393. The upper edge 1391 may be formed in a stepped region formed at the boundary of the lower edge of the flat plate portion 130P. The lower edge 1393 may be formed in the first accommodating portion 137a adjacent to the upper edge of the first accommodating portion 137a. The left edge 1392 connects the left end of the upper edge 1391 and the left end of the lower edge 1393 and may be formed in the lower edge stepped region of the flat plate portion 130P, the third outer part 135c, and / or the first accommodating portion 137a. The right edge 1394 may be formed in a stepped region formed at the boundary of the lower edge 1393 of the flat plate portion 130P, the third outer part 135c, and / or the first accommodating portion 137a. For example, the length of the left side 1392 may be greater than the length of the right side 1394, the top side 1391 may form a straight line, and the bottom side 1393 may include straight lines and curves.

[0129] The second slit 139a2 may include an upper edge 1395, a left edge 1396, a right edge 1398, and a lower edge 1397. The upper edge 1395 may be formed at a boundary of a lower edge of the flat plate portion 130P. The lower edge 1397 may be formed in the first accommodating portion 137a adjacent to an upper edge of the first accommodating portion 137a. The left edge 1396 connects the left end of the upper edge 1395 and the left end of the lower edge 1397 and may be formed in a lower edge step region of the flat plate portion 130P, the third outer part 135c, and / or the first accommodating portion 137a. The right edge 1398 may be formed in a step region formed at a boundary of a lower edge of the flat plate portion 130P, the third outer part 135c, and / or the first accommodating portion 137a. For example, the length of the left side 1396 is substantially the same as the length of the right side 1398, the top side 1395 can include straight lines and curved lines, and the bottom side 1397 can include straight lines and curved lines. The top side 1395 can be parallel to the bottom side 1397.

[0130] 27, the second cutout 139b may include a first slit 139b1 and a second slit 139b2. The first slit 139b1 and / or the second slit 139b2 may extend longitudinally of the receiving portion 137. The first slit 139b1 may be formed at the boundary of the flat plate portion 130P, the boundary of the third outer part 135c, and / or the boundary of the second receiving portion 137b. The second slit 139b2 may be formed close to the first slit 139b1 at the boundary of the flat plate portion 130P, the boundary of the third outer part 135c, and / or the boundary of the second receiving portion 137b.

[0131] The first slit 139b1 may include an upper edge 1391, a left edge 1392, a right edge 1394, and a lower edge 1393. The upper edge 1391 may be formed in a stepped region formed at the boundary of the lower edge of the flat plate portion 130P. The lower edge 1393 may be formed in the second accommodating portion 137b adjacent to the upper edge of the second accommodating portion 137b. The left edge 1392 connects the left end of the upper edge 1391 and the left end of the lower edge 1393 and may be formed in the lower edge stepped region of the flat plate portion 130P, the third outer part 135c, and / or the second accommodating portion 137b. The right edge 1394 may be formed in a stepped region formed at the boundary of the lower edge 1393 of the flat plate portion 130P, the third outer part 135c, and / or the second accommodating portion 137b. For example, the length of the left side 1392 may be less than the length of the right side 1394, the top side 1391 may form a straight line, and the bottom side 1393 may include straight lines and curves.

[0132] The second slit 139b2 may include an upper edge 1395, a left edge 1396, a right edge 1398, and a lower edge 1397. The upper edge 1395 may be formed at a boundary of a lower edge of the flat plate portion 130P. The lower edge 1397 may be formed in the second accommodating portion 137b adjacent to an upper edge of the second accommodating portion 137b. The left edge 1396 connects the left end of the upper edge 1395 and the left end of the lower edge 1397 and may be formed in a lower edge step region of the flat plate portion 130P, the third outer part 135c, and / or the second accommodating portion 137b. The right edge 1398 may be formed in a step region formed at a boundary of a lower edge of the flat plate portion 130P, the third outer part 135c, and / or the second accommodating portion 137b. For example, the length of the left side 1396 is substantially the same as the length of the right side 1398, the top side 1395 can include straight lines and curved lines, and the bottom side 1397 can include straight lines and curved lines. The top side 1395 can be parallel to the bottom side 1397.

[0133] 28, the third outer part 135c may be formed by pressing the flat plate portion 130P. The front skin 132 of the third outer part 135c may have a step portion D5 that is lower than the front skin 132 of the flat plate portion 130P.

[0134] The receiving portion 137 may be formed by pressing the third outer part 135c. The front skin 132 of the receiving portion 137 may have a step D6 that is lower than the front skin 132 of the third outer part 135c.

[0135] The rear skin 133 of the housing portion 137 may be elevated from the rear skin 133 of the third outer part 135c to form a step portion D2. For example, the height of the step portion D6, which decreases from the front skin 132 of the third outer part 135c to the front skin 132 of the housing portion 137, may be smaller than the height of the step portion D2, which increases from the rear skin 133 of the third outer part 135c to the rear skin 133 of the housing portion 137. The thickness T1 of the flat plate portion 130P may be greater than the thickness T2 of the housing portion 137. The thickness T4 of the third outer part 135c may be smaller than the thickness T1 of the flat plate portion 130P. The thickness T2 of the housing portion 137 may be greater than the thickness T4 of the third outer part 135c.

[0136] When pressed in the direction from the front skin 132 of the flat plate portion 130P to the rear skin 133, the core 131 of the composite material panel 130 can absorb the external force. The magnitude of the external force acting on the front skin 132 of the flat plate portion 130P may be greater than the magnitude of the external force acting on the rear skin 133 of the flat plate portion 130P. The core 131 of the composite material panel 130 not only ensures rigidity but also absorbs impact.

[0137] The fastening recess H may protrude from the rear skin 133 of the receiving portion 137. The fastening recess H may be recessed from the front skin 132 of the receiving portion 137 and protrude from the rear skin 133 of the receiving portion 137. The center of the fastening recess H may be formed through.

[0138] The first slits 139a1, 139b1 may be formed through the front skin 132, the core 131, and / or the rear skin 133. The second slits 139a2, 139b2 may be formed through the front skin 132, the core 131, and / or the rear skin 133.

[0139] 29 and 30, the outer part 135 may be formed around the flat plate portion 130P. The outer part 135 may have a step portion that is lower than the flat plate portion 130P. The outer part 135 may be formed by compressing the core 131 (see FIG. 2) and causing the front skin 132 to sink. The outer part 135 may also be formed by compressing the core 131 and causing the front skin 132 to sink and the rear skin 133 to protrude.

[0140] The third outer part 135c may be formed adjacent to the lower side of the flat plate part 130P. The third outer part 135c may form a step portion that is lower than the flat plate part 130P and may be formed at the lower end of the flat plate part 130P.

[0141] The receiving portions 137, 137a, and 137b may be formed in the third outer part 135c. The receiving portions 137, 137a, and 137b may be formed by pressing the flat plate portion 130P. The receiving portions 137, 137a, and 137b may form stepped portions that are lower than the flat plate portion 130P. For example, the receiving portions 137, 137a, and 137b may be flush with the third outer part 135c. As another example, the receiving portions 137, 137a, and 137b may be formed by pressing the third outer part 135c.

[0142] The barrier slits SL1 and SL2 may be located at the boundary between the flat portion 130P and the accommodation portions 137a and 137b. The barrier slits SL1 and SL2 may be referred to as barriers SL1 and SL2. The barrier slits SL1 and SL2 may be referred to as incisions SL1 and SL2. The barrier slits SL1 and SL2 may be referred to as barrier cutouts SL1 and SL2.

[0143] The barrier slits SL1 and SL2 may be formed on an inclined surface of a step portion that descends from the flat portion 130P to the receiving portions 137a and 137b. The barrier slits SL1 and SL2 may be formed by cutting out a part of the flat portion 130P and a part of the receiving portions 137a and 137b. There may be a plurality of barrier slits SL1 and SL2. The plurality of barrier slits SL1 and SL2 may include a first slit SL1 and a second slit SL2.

[0144] The first slit SL1 may include a first part P1, a second part P2, a third part P3, a fourth part P4, a fifth part P5, a sixth part P6, a seventh part P7, and an eighth part P8. The first part P1, the second part P2, and the third part P3 may form a lower edge of the first slit SL1. The fourth part P4, the fifth part P5, and the sixth part P6 may form an upper edge of the first slit SL1. The upper edge of the first slit SL1 may be parallel to the lower edge of the first slit SL1. The seventh part P7 may connect one end of the upper edge to one end of the lower edge of the first slit SL1, and the eighth part P8 may connect the other end of the upper edge to the other end of the lower edge of the first slit SL1. The seventh part P7 may be parallel to the eighth part P8.

[0145] The first part P1 may be parallel to the third part P3. The third part P3 may be spaced apart from the first part P1. The second part P2 may connect the first part P1 and the third part P3. The fourth part P4 may be parallel to the sixth part P6. The sixth part P6 may be spaced apart from the fourth part P4. The fifth part P5 may connect the fourth part P4 and the sixth part P6.

[0146] The fourth part P4, the fifth part P5, and the sixth part P6 may form one edge of the flat portion 130P. The first part P1, the second part P2, and the third part P3 may form one edge of the receiving portions 137a and 137b. The seventh part P7 and the eighth part P8 may form one edge of a step portion connecting the receiving portions 137a and 137b to the flat portion 130P.

[0147] A second distance D2 from the lower sides of the housing portions 137a and 137b to the third part P3 may be greater than a first distance D1 from the lower sides of the housing portions 137a and 137b to the first part P1.

[0148] The second slit SL2 may include a first part E1, a second part E2, a third part E3, a fourth part E4, a fifth part E5, a sixth part E6, a seventh part E7, and an eighth part E8. The first part E1, the second part E2, and the third part E3 may form a lower edge of the second slit SL2. The fourth part E4, the fifth part E5, and the sixth part E6 may form an upper edge of the second slit SL2. The upper edge of the second slit SL2 may be parallel to the lower edge of the second slit SL2. The seventh part E7 may connect one end of the upper edge to one end of the lower edge of the second slit SL2, and the eighth part E8 may connect the other end of the upper edge to the other end of the lower edge of the second slit SL2. The seventh part E7 may be parallel to the eighth part E8.

[0149] The first part E1 may be parallel to the third part E3. The third part E3 may be spaced apart from the first part E1. The second part E2 may connect the first part E1 and the third part E3. The fourth part E4 may be parallel to the sixth part E6. The sixth part E6 may be spaced apart from the fourth part E4. The fifth part E5 may connect the fourth part E4 and the sixth part E6.

[0150] The fourth part E4, the fifth part E5, and the sixth part E6 may form one edge of the flat portion 130P. The first part E1, the second part E2, and the third part E3 may form one edge of the receiving portions 137a and 137b. The seventh part E7 and the eighth part E8 may form one edge of a step portion connecting the receiving portions 137a and 137b to the flat portion 130P.

[0151] A second distance D2 from the lower sides of the receiving portions 137a and 137b to the third part E3 may be greater than a first distance D1 from the lower sides of the receiving portions 137a and 137b to the first part E1. The first slit SL1 may be symmetrical to the second slit SL2.

[0152] Therefore, poor bonding of the display panel 110 to the composite material panel 130 due to bending of the skins 132 and 133 when forming the receiving portions 137a and 137b can be improved.

[0153] 31, the multiple barrier slits SL1, SL2 may include a first slit SL1, a second slit SL2, and a third slit SL3. The third slit SL3 may extend long and may be spaced apart from the first slit SL1 and the second slit SL2. The third slit SL3 may face the receiving portions 137a, 137b based on the first slit SL1 and the second slit SL2.

[0154] The length L1 of the third slit SL3 may be smaller than the distance between the seventh part P7 of the first slit SL1 and the seventh part E7 of the second slit SL2. The width w1 of the third slit SL3 may be smaller than the widths w2 and w3 of the first slit SL1 and / or the second slit SL2.

[0155] A third distance D3 from the sixth part P6 of the first slit SL1 to the third slit SL3 may be smaller than the second distance D2 from the lower sides of the accommodation portions 137a, 137b to the third part P3 of the first slit SL1.

[0156] Therefore, poor bonding of the display panel 110 to the composite material panel 130 due to bending of the composite material panel 130 can be further improved.

[0157] 32 , fasteners 300 may be coupled to composite panel 130. For example, fasteners 300 may be PEM nuts. Fastener holes H may be formed through composite panel 130. Fastener holes H may be formed through front skin 132, core 131, and rear skin 133.

[0158] The fastener 300 may be inserted into the fastener hole H. The fastener 300 may be pressed into the composite panel 130 to couple the fastener 300. As the fastener 300 couples, the composite panel 130 may be compressed around the fastener 300. For example, the rear skin 133 of the composite panel 130 may be supported by the die block DB, and the front skin 132 of the composite panel 130 may be compressed by the press block PB. As the press block PB moves toward the die block DB, the composite panel 130 and the fastener 300 may be pressed.

[0159] The front skin 132 of the composite material panel 130 may be recessed, forming a stepped portion where the portion that contacts the press block PB is lowered. The rear skin 133 of the composite material panel 130 may be recessed, forming a stepped portion where the portion that contacts the die block DB is lowered. The core 131 may be compressed by pressing the front skin 132 and the rear skin 133. The height H2 of the stepped portion of the rear skin 133 may be greater than the height H1 of the stepped portion of the front skin 132.

[0160] The fastener 300 may include a head 310, a shaft body 320, a shaft hole 330, and a neck 340. The shaft body 320 may have a long cylindrical shape. The head 310 is formed at the upper end of the shaft body 320, and the neck 340 may connect the shaft body 320 and the head 310 between the upper end of the shaft body 320 and the head 310. The diameter of the neck 340 may be smaller than the diameter of the shaft body 320, and the diameter of the head 310 may be larger than the diameter of the shaft body 320. The shaft hole 330 may be formed by removing the interior of the shaft body 320 from the lower end of the shaft body 320 toward the head 310 in the longitudinal direction of the shaft body 320. The shaft hole 330 allows the shaft body 320 to have a cylindrical shape.

[0161] 33, the fastener 300 may include a head 310, a shaft body 320, a shaft hole 330, and a neck 340. The shaft body 320 may have an elongated cylindrical shape. The shaft body 320 may have a diameter A and a length C. The head 310 is formed at the upper end of the shaft body 320, and the neck 340 may connect the shaft body 320 and the head 310 between the upper end of the shaft body 320 and the head 310. The head 310 may have a diameter I and a thickness D. The diameter B of the neck 340 may be smaller than the diameter A of the shaft body 320, and the diameter I of the head 310 may be larger than the diameter A of the shaft body 320. The thickness E of the head 310 and the neck 340 may be referred to as a combined thickness E.

[0162] The shaft hole 330 may be formed by removing the interior of the shaft body 320 from the lower end of the shaft body 320 in the longitudinal direction of the shaft body 320 toward the head 310. The shaft hole 330 allows the shaft body 320 to have a cylindrical shape. The shaft hole 330 may have a diameter F and a length G. The length G of the shaft hole 330 may be smaller than the length G of the shaft body 320, and the diameter F of the shaft hole 330 may be smaller than the diameter A of the shaft body 320.

[0163] 34, the fastener 300 may include a head 310, a shaft body 320, a shaft hole 330, and a neck 340. The shaft body 320 may have an elongated cylindrical shape. The shaft body 320 may have a diameter A and a length C. The head 310 is formed at the upper end of the shaft body 320, and the neck 340 may connect the shaft body 320 and the head 310 between the upper end of the shaft body 320 and the head 310. The head 310 may have a diameter I and a thickness D. The diameter B of the neck 340 may be smaller than the diameter A of the shaft body 320, and the diameter I of the head 310 may be larger than the diameter A of the shaft body 320. The thickness E of the head 310 and the neck 340 may be referred to as a combined thickness E.

[0164] The shaft body 320 may include a main body 320a and a tail body 320b. The main body 320a may be connected to a neck 340, and the tail body 320b may form the distal end of the shaft body 320. The tail body 320b may face the neck 340 relative to the main body 320a. A diameter H of the tail body 320b may be smaller than a diameter A of the main body 320a. A length C1 of the main body 320a may be greater than a length C2 of the tail body 320b.

[0165] The shaft hole 330 may be formed by removing the interior of the shaft body 320 from the lower end of the shaft body 320 in the longitudinal direction of the shaft body 320 toward the head 310. The shaft hole 330 may give the shaft body 320 a cylindrical shape. The shaft hole 330 may have a diameter F and a length G. The length G of the shaft hole 330 may be smaller than the length G of the shaft body 320, and the diameter F of the shaft hole 330 may be smaller than the diameter A of the shaft body 320. The diameter F of the shaft hole 330 may be smaller than the diameter H of the tail body 320b.

[0166] 35 and 36, the thickness D of the head 310 may be smaller than the thickness ED of the neck 340. The thickness D of the head 310 may correspond to the thickness of the front skin 132. For example, the thickness of the front skin 132 may be 0.5 mm, the thickness of the rear skin 133 may be 0.5 mm, and the thickness of the core 131 may be 3 mm. For example, the thickness ED of the neck 340 may be 1.5 to 2.3 times the thickness D of the head 310. As another example, the thickness ED of the neck 340 may be twice the thickness D of the head 310. As another example, the thickness D of the head 310 may be 0.5 mm, and the thickness ED of the neck 340 may be 1 mm. The diameter A of the shaft body 320 may be larger than the diameter B of the neck 340. For example, the difference AB between the diameter A of the shaft body 320 and the diameter B of the neck 340 may be 0.8 mm.

[0167] 32 , as the fastener 300 is coupled to the composite panel 130, the core 131 around the fastener 300 is compressed and the front skin 132 and / or rear skin 133 may be pressed. The front surface of the front skin 132 may be flush with the front surface of the head 310 of the fastener 300. The front skin 132 may contact the sides and bottom of the head 310 of the fastener 300. The front skin 132 may be pressed between the head 310 and the neck 340 of the fastener 300.

[0168] The rear skin 133 may face the front skin 132 with respect to the core 131. The rear skin 133 may contact the outer surface of the shaft body 320 of the fastener 300. The core 131 may be compressed between the front skin 132 and the rear skin 133, and may be pressed between the upper surface of the shaft body 320 and the lower surface of the head 310, and may contact the side surface of the neck 340. This improves the horizontal fastening force of the fastener 300 to the composite material panel 130. The horizontal fastening force may be a resistance force against a moment applied to the fastener 300.

[0169] Therefore, the fastening member 300 can be firmly connected to the composite material panel 130 having a small thickness.

[0170] 37 and 38, the thickness D of the head 310 may be greater than the thickness ED of the neck 340. The thickness D of the head 310 may be greater than the thickness of the front skin 132. For example, the thickness of the front skin 132 may be 0.5 mm, the thickness of the rear skin 133 may be 0.5 mm, and the thickness of the core 131 may be 3 mm. For example, the thickness D of the head 310 may be 1.1 to 1.5 times the thickness ED of the neck 340. As another example, the thickness D of the head 310 may be 1.3 times the thickness ED of the neck 340. As another example, the thickness D of the head 310 may be 1.3 mm, and the thickness ED of the neck 340 may be 1 mm. The diameter A of the shaft body 320 may be greater than the diameter B of the neck 340. For example, the difference AB between the diameter A of the shaft body 320 and the diameter B of the neck 340 may be 0.8 mm.

[0171] 32 , as the fastener 300 is coupled to the composite panel 130, the core 131 around the fastener 300 is compressed and the front skin 132 and / or rear skin 133 may be pressed. The front surface of the front skin 132 may be flush with the front surface of the head 310 of the fastener 300. The front skin 132 may contact the sides and bottom of the head 310 of the fastener 300. The front skin 132 may be pressed between the head 310 and the neck 340 of the fastener 300.

[0172] The rear skin 133 may face the front skin 132 with respect to the core 131. The rear skin 133 may contact the outer surface and / or the upper surface of the shaft body 320 of the fastening member 300. The core 131 may be compressed between the front skin 132 and the rear skin 133 and pressed into between the upper surface of the shaft body 320, the lower surface of the head 310, and the side surface of the neck 340. This improves the vertical fastening force of the fastening member 300 to the composite material panel 130. The vertical fastening force may be a resistance force to a force applied in the longitudinal direction of the fastening member 300.

[0173] Therefore, the fastening member 300 can be firmly connected to the composite material panel 130 having a small thickness.

[0174] 39 and 40 , the head 310 may be formed in a multi-step configuration (311, 312). The head 310 may include a first head portion 311 and a second head portion 312. The first head portion 311 may have a diameter I1 and a thickness D1, and the second head portion 312 may have a diameter I2 and a thickness D2. The second head portion 312 may be located above the first head portion 311. The second head portion 312 may form the upper portion of the head 310, and the first head portion 311 may form the lower portion of the head 310. The diameter I2 of the second head portion 312 may be larger than the diameter I1 of the first head portion 311. The thickness D1 of the first head portion 311 may be larger than the thickness D2 of the second head portion 312. The diameter I1 of the first head portion 311 may be larger than the diameter A of the shaft body 320. The diameter A of the shaft body 320 may be larger than the diameter B of the neck 340.

[0175] The thickness D (D1+D2) of the head 310 may be greater than the thickness ED of the neck 340. The thickness D (D1+D2) of the head 310 may be greater than the thickness of the front skin 132.

[0176] For example, if the skins 312, 313 comprise aluminum, the front skin 132 may be 0.5 mm thick, the rear skin 133 may be 0.5 mm thick, and the core 131 may be 3 mm thick.

[0177] As another example, when the skins 312, 313 contain iron, the thickness of the front skin 132 may be 0.2 to 0.3 mm, the thickness of the rear skin 133 may be 0.2 to 0.3 mm, and the thickness of the core 131 may be 3 mm.

[0178] For example, the thickness D1 of the first head portion 311 may be 0.8 to 1.2 mm, and the thickness D2 of the second head portion 312 may be 0.4 to 0.8 mm. For example, the thickness ED of the neck 340 may be 0.8 to 1.3 mm.

[0179] The diameter A of the shaft body 320 may be larger than the diameter B of the neck 340. For example, the difference AB between the diameter A of the shaft body 320 and the diameter B of the neck 340 may be 0.8 mm.

[0180] 41 and 42, the fastening hole H may include a through hole PH, a first pressing portion HD1, and a second pressing portion HD2. The shaft body 320 of the fastening member 300 (see FIG. 32) may be inserted into the through hole PH. The diameter D1 of the through hole PH may correspond to the diameter A of the shaft body 320 (see FIG. 39). For example, the diameter D1 of the through hole PH may be 7.5 to 8.5 mm. As another example, the diameter D1 of the through hole PH may be 8.1 mm.

[0181] The first press part HD1 may be formed by recessing the front skin 132. The second press part HD2 may be formed by recessing the rear skin 133. The depth H2 of the second press part HD2 may be greater than the depth H1 of the first press part HD1. For example, the depth H1 of the first press part HD1 may be 0.4 mm, and the depth H2 of the second press part HD2 may be 1.8 mm.

[0182] The diameter D2 of the first press section HD1 may correspond to the diameter D2 of the second press section HD2. For example, the diameter D2 of the first press section HD1 and / or the diameter D2 of the second press section HD2 may be 15 to 16 mm. As another example, the diameter D1 of the first press section HD1 and / or the diameter D2 of the second press section HD2 may be 15.8 mm.

[0183] The diameters I1 and I2 of the head 310 of the fastening member 300 (see FIG. 39) may be between the diameter D1 of the through hole PH and the diameter D2 of the first press part HD1.

[0184] 43 to 45, the first press part HD1 and the second press part HD2 may be formed by the press process described with reference to Fig. 32 after the fastening member 300 is inserted into the fastening hole H. The press parts HD1 and HD2 formed on the composite material panel 130 of Figs. 43 and 44 may be formed by the process described with reference to Fig. 45.

[0185] The fastening member 300 can be inserted into the fastening hole H. The shaft body 320 of the fastening member 300 can pass through the through hole PH of the fastening hole H. The head 310 of the fastening member 300 that has passed through the through hole PH can be attached to the front skin 132.

[0186] 32, the head 310 of the fastening member 300 can be pressed into the front skin 132 and the core 131. By pressing, a first pressed portion HD1 can be formed in the front skin 132 around the head 310 of the fastening member 300, and a second pressed portion HD2 can be formed in the rear skin 133 around the shaft body 320 of the fastening member 300.

[0187] Referring to FIG. 46, when the fastener 300 is coupled to the composite panel 130, the head 310, neck 340 and / or shaft body 320 of the fastener 300 can contact the front skin 132, rear skin 133 and / or core 131 of the composite panel 130.

[0188] The front skin 132 can be pressed onto the head 310 and neck 340, and the rear skin 133 can be pressed onto the neck 340. The core 131 can be compressed and crimped between the front skin 132 and the rear skin 133.

[0189] The front surface of the front skin 132 may be flush with the outer surface of the second head portion 312. The front skin 132 may be pressed into a stepped portion on the lower surface of the head 310 to be coupled thereto. The front skin 132 may contact the side and lower surfaces of the second head portion 312 and the side and lower surfaces of the first head portion 311. A portion of the front skin 132 may be pressed into the neck 340 to contact the lower surface of the first head portion 311 and the side surfaces of the neck 340.

[0190] The rear skin 133 may be pressed into the neck 340 and contact the sides of the neck 340 and / or the sides of the shaft body 320 .

[0191] Therefore, not only is the horizontal fastening force of the fastening member 300 to the composite material panel 130 improved, but the vertical fastening force of the fastening member 300 to the composite material panel 130 is also improved. The horizontal fastening force may be a resistance force against a moment applied to the fastening member 300. The vertical fastening force may be a resistance force against a force applied in the longitudinal direction of the fastening member 300.

[0192] Therefore, the fastening member 300 can be firmly connected to the composite material panel 130 having a small thickness.

[0193] 47 and 48, the fastener 400 may include a shaft body 410, a coupling head 420, and a shaft hole 430. The shaft body 410 has a cylindrical shape, and the shaft hole 430 may be formed by removing the interior of the shaft body 410.

[0194] The coupling head 420 may include a head body 421 and a head flange 422. The head body 421 may have a cylindrical shape, and the head flange 422 may have a disk shape extending from the upper end of the head body 421 in the radial direction of the head body 421. The coupling head 420 may be deformed by an external force.

[0195] The head body 421 of the coupling head 420 may have a length D and a diameter B. The head flange 422 of the coupling head 420 may have a thickness E and a diameter A. The shaft body 410 may have a length C and a diameter B. The shaft hole 430 may have a length F and a diameter G.

[0196] For example, the length C of the shaft body 410 may be 35 mm, the diameter B of the shaft body 410 may be 20 mm, the length DE of the head body 421 may be 10 mm, the diameter B of the head body 421 may be 20 mm, the thickness E of the head flange 422 may be 0.5 mm, and the diameter A of the head flange 422 may be 27 mm.

[0197] The composite material panel 130 may include fastening holes H. The fastening holes H may include through holes PH and pressed portions HD. The pressed portions HD may be formed by depressing the front skin 132 of the composite material panel 130 and compressing the core 131. The pressed portions HD may form a step portion that is lowered from the front surface of the front skin 132.

[0198] 49 together with FIG. 48, when the fastener 400 is coupled to the composite panel 130, the shaft body 410 is inserted into the through-hole PH, and the head flange 422 can be positioned in the press section HD. The head flange 422 can be supported by or in contact with the front skin 132 of the press section HD.

[0199] When a force is applied to the shaft body 410 in the longitudinal direction, the cylindrical head body 421 is deformed and broken, and a head ream 421d having an outer diameter larger than the outer diameter of the head body 421 can be formed. The head ream 421d can be called a rivet ream 421d.

[0200] Therefore, not only is the horizontal fastening force of the fastening member 400 to the composite material panel 130 improved, but the vertical fastening force of the fastening member 400 to the composite material panel 130 is also improved. The horizontal fastening force may be a resistance force against a moment applied to the fastening member 400. The vertical fastening force may be a resistance force against a force applied in the longitudinal direction of the fastening member 400.

[0201] Therefore, the fastening member 400 can be firmly bonded to the composite material panel 130 having a small thickness.

[0202] 1 to 49, a display device includes a display panel, a composite material plate to which the display panel is coupled, and a fastening member coupled to the composite material plate, the composite material plate including a front skin forming a front surface, a rear skin forming a rear surface and facing the front skin, a core positioned between the front skin and the rear skin and including fibers, and a fastening hole formed through the front skin, the rear skin, and the core, the fastening member including a shaft body inserted into the fastening hole, and a head connected to the shaft body and pressed into either the front skin or the rear skin, and either the front skin or the rear skin contacts a side of the head.

[0203] The fastening member may further include a neck connecting the shaft body and the head, and either the front skin or the rear skin may be pressed toward the neck between the head and the shaft body.

[0204] The fastener may be generally cylindrical, with the head having a diameter greater than the diameter of the shaft body, which in turn has a diameter greater than the diameter of the neck.

[0205] The head may include a first head portion connected to the neck and a second head portion connected to the first head portion and forming a top surface of the voting member, and the diameter of the second head portion may be larger than the diameter of the first head portion.

[0206] The head may include a step portion formed on the first head portion and the second head portion, and one of the front skin and the rear skin may contact the step portion.

[0207] The core may be compressed adjacent the head portion, with the thickness of the core gradually increasing in the radial direction of the shaft body.

[0208] The front skin, the rear skin, and the core are pressed toward the neck between the head portion and the shaft body and can contact at least one of the lower surface of the head, the side surface of the neck, or the upper surface of the shaft body.

[0209] The thickness of the first head portion may be greater than the thickness of the second head portion, and the thickness of the neck may be greater than the thickness of the first head portion.

[0210] The fastening member may further include a shaft hole formed by removing an interior portion of the shaft body in a longitudinal direction of the shaft body from an end surface of the shaft body that forms a bottom surface of the fastening member, and the length of the shaft body may be greater than the length of the shaft hole.

[0211] The head of the fastening member is pressed into the front skin, and the composite material panel further includes a first press portion formed by the front skin being depressed around the head of the fastening member, and a second press portion formed by the rear skin being depressed around the shaft body of the fastening member, and the depth of the second press portion may be greater than the depth of the first press portion.

[0212] The outer surface of the head may be flush with the outer surface of the front skin that forms the first press portion.

[0213] The diameter of the shaft body may correspond to the diameter of the fastening hole, and the diameter of the head may be larger than the diameter of the shaft body.

[0214] The neck may have a thickness greater than the thickness of the head, or the neck may have a thickness less than the thickness of the head. The specific embodiments or other embodiments of the present disclosure described above are not mutually exclusive or distinct, and the structure or function of any or all elements of the embodiments of the present disclosure described above can be combined with other elements or combined with each other.

[0215] For example, configuration A described in one embodiment of the present disclosure and drawings and configuration B described in another embodiment of the present disclosure and drawings can be combined with each other. That is, even if a combination between configurations is not directly described, the combination is possible unless it is described that the combination is not possible.

[0216] While the embodiments have been described above in accordance with a number of exemplary embodiments, it should be understood that many other variations and embodiments are possible for those skilled in the art that fall within the scope of the principles of the present disclosure. More particularly, various modifications and variations are possible in the components and / or arrangements of the subject combinations within the scope of the present disclosure, the drawings, and the appended claims. In addition to the modifications and variations of the components and / or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. 1. A display device, comprising: a display panel; a composite material plate to which the display panel is bonded; a fastening member coupled to the composite plate; The composite material plate is a front skin forming a front surface; a rear skin forming a rear surface and facing the front skin; a core located between the front skin and the rear skin and including fibers; fastening holes formed through the front skin, the rear skin, and the core; The fastening member is a shaft body inserted into the fastening hole; a head connected to the shaft body, the head of the fastening member is pressed into the front skin, and the front skin contacts the lateral surface of the head; The composite material plate further includes a first pressing portion formed by depressing a front surface of the front skin around the head of the fastening member.

2. The fastening member further includes a neck connecting the shaft body and the head, The display device of claim 1 , wherein one of the front skin or the rear skin is pressed toward the neck between the head and the shaft body.

3. the fastener is generally cylindrical; the diameter of the head is greater than the diameter of the shaft body; The display device of claim 2 , wherein the diameter of the shaft body is greater than the diameter of the neck.

4. The head a first head portion connected to the neck; a second head portion connected to the first head portion and forming an upper surface of the fastening member, The display device of claim 3 , wherein the diameter of the second head portion is greater than the diameter of the first head portion.

5. the head includes a step portion formed between a side surface of the first head portion and a side surface of the second head portion, The display device according to claim 4 , wherein the front skin contacts the step portion.

6. 6. The display device of claim 5, wherein the core is compressed adjacent the head, the thickness of the core gradually increasing in the radial direction of the shaft body.

7. 4. The display device of claim 3, wherein the front skin, the rear skin, and the core are pressed toward the neck between the head and the shaft body and contact at least one of a lower surface of the head, a side surface of the neck, or an upper surface of the shaft body.

8. the thickness of the first head portion is greater than the thickness of the second head portion; The display device of claim 4 , wherein the thickness of the neck is greater than the thickness of the first head portion.

9. The fastening member further includes a shaft hole formed by removing an interior of the shaft body from an end of the shaft body that forms a lower surface of the fastening member in a longitudinal direction of the shaft body, The display device of claim 8 , wherein the length of the axle body is greater than the length of the axle hole.

10. The composite material plate further includes a second pressed portion formed by recessing the rear surface of the rear skin around the shaft body of the fastening member, The display device of claim 1 , wherein the depth of the second press portion is greater than the depth of the first press portion.

11. The display device of claim 10, wherein an outer surface of the head is flush with an outer surface of the front skin forming the first press portion.

12. The diameter of the shaft body corresponds to the diameter of the fastening hole; The display device of claim 1 , wherein the diameter of the head is greater than the diameter of the shaft body.

13. The display device of claim 2 , wherein the neck has a thickness greater than the head thickness.

14. The display device of claim 2 , wherein the neck has a thickness less than the head thickness.

15. The display device of claim 1 , wherein the fastener is a PEM nut.

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