Method for producing composite sheet and display panel including the composite sheet

Abstract

Disclosed are a method for producing a composite sheet and a display panel including the composite sheet. The method includes: forming a first support layer; forming a light refraction layer on the first support layer, the light refraction layer including a plurality of light refraction elements; forming a second support layer on the light refraction layer, wherein the first support layer, the light refraction layer, and the second support layer together form a composite sheet; attaching the composite sheet to the rear surface of a panel layer; and obliquely cutting the composite sheet by irradiating a laser beam that penetrates the second support layer, the light refraction layer, and the first support layer, the laser beam irradiating the composite sheet to cover openings at edges of the light refraction layer. The composite sheet reduces moisture penetration by forming side covers that cover openings at edges of the light refraction layer included in the composite sheet.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2021-0191443, filed on December 29, 2021, which is hereby incorporated by reference in its entirety. Technical Field

[0003] The present disclosure relates to a method for producing a composite sheet and a display panel including the composite sheet. More specifically, the present disclosure relates to a method for producing a composite sheet capable of preventing or at least reducing moisture penetration by forming a side cover, and a display panel including the composite sheet. Background Art

[0004] Liquid crystal display (LCD) is one of the most widely used display devices. Typically, a LCD device includes a liquid crystal display panel, which includes a light source and a liquid crystal layer.

[0005] In order to uniformly distribute light moving from a light source toward a liquid crystal display panel across the entire liquid crystal display panel, an optical sheet having a plurality of thick layers and a diffusion plate having a relatively large thickness are used.

[0006] The optical sheet can be formed by arranging multiple triangular prisms. In this case, spaces are formed between the prisms. Moisture can easily penetrate these spaces. When moisture penetrates the optical sheet, it spreads throughout the sheet due to capillary action. This reduces the functionality of the optical sheet and degrades the screen quality of the display panel. Summary of the Invention

[0007] The present disclosure solves the above problems and provides a method for producing a composite sheet capable of reducing or preventing quality degradation by preventing or at least reducing moisture from penetrating into an optical sheet, and a display panel including the composite sheet.

[0008] In one embodiment, a method for producing a composite sheet includes: forming a first support layer; forming a light refraction layer on the first support layer, the light refraction layer including a plurality of light refraction elements; forming a second support layer on the light refraction layer, wherein the first support layer, the light refraction layer and the second support layer together form a composite sheet; attaching the composite sheet to the rear surface of the panel layer; and obliquely cutting the composite sheet by irradiating a laser beam that penetrates the second support layer, the light refraction layer and the first support layer, the irradiation of the laser beam covering the opening at the edge of the light refraction layer.

[0009] In one embodiment, a display panel includes: a panel layer; a composite sheet on the rear surface of the panel layer, the composite sheet including a planar portion and an inclined portion; and a housing in which the panel layer and the composite sheet are arranged, wherein the composite sheet includes: a first supporting layer on the rear surface of the panel layer, the first supporting layer including a first material; a light refraction layer on the rear surface of the first supporting layer, the light refraction layer including a second material; a second supporting layer on the rear surface of the light refraction layer, the second supporting layer including the first material; and a side cover on the inclined portion of the composite sheet, the side cover covering an opening at an edge of the light refraction layer.

[0010] In one embodiment, the composite sheet includes: a first support layer comprising a first material; a light refraction layer on the first support layer, the light refraction layer comprising a plurality of light refraction elements of a second material, the second material being different from the first material; a second support layer on the light refraction layer, the second support layer comprising the first material; and a side cover disposed at an angle on the first support layer, the light refraction layer, and the second support layer, the side cover covering an opening at an edge of the light refraction layer due to the shape of the plurality of light refraction elements.

[0011] In the composite sheet according to the present disclosure, moisture penetration may be reduced or prevented by the side covers.

[0012] The composite sheet according to the present disclosure may reduce or prevent degradation of the screen quality of a display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an exploded perspective view showing a display panel according to an embodiment of the present disclosure;

[0014] Figure 2 According to the embodiment of the present disclosure Figure 1 A cross-sectional view taken along line II in FIG.

[0015] Figure 3 According to the embodiment of the present disclosure Figure 2 Enlarged views of parts B and C in FIG;

[0016] Figures 4 to 6 is a view illustrating a method for producing a composite sheet according to an embodiment of the present disclosure;

[0017] Figure 7 is a perspective view showing a composite sheet according to an embodiment of the present disclosure;

[0018] Figures 8 to 10 It is along Figure 7 A cross-sectional view taken along the cutting line AA' in the composite sheet;

[0019] Figure 11According to the embodiment of the present disclosure Figure 7 A cross-sectional view taken along a cutting line B1-B1' in the composite sheet;

[0020] Figure 12 According to the embodiment of the present disclosure Figure 7 A cross-sectional view taken along a cutting line B2-B2' in the composite sheet;

[0021] Figure 13 is a perspective view showing a composite sheet according to another embodiment of the present disclosure;

[0022] Figure 14 According to the embodiment of the present disclosure Figure 13 An enlarged view of portion D of the composite sheet is shown;

[0023] Figure 15 is a perspective view showing a composite sheet according to another embodiment of the present disclosure;

[0024] Figure 16 An embodiment according to the present disclosure is shown along Figure 15 The cross section of the composite sheet in the E-E' direction;

[0025] Figure 17 is a perspective view showing a composite sheet according to another embodiment of the present disclosure; and

[0026] Figure 18 An embodiment according to the present disclosure is shown along Figure 17 The cross section of the composite sheet in the F-F' direction. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments will be described with reference to the accompanying drawings. In this document, when it is mentioned that a component (or region, layer, part, etc.) is "on another component," "connected to" or "coupled to" another component, this may mean that the component can be directly connected / coupled to the other component, or a third component may be provided therebetween.

[0028] The same reference numerals refer to the same components. In the entire drawings, the thickness, ratio, and size of the components are exaggerated in order to effectively describe technical matters. "And / or" may include one or more combinations that can be defined by the relevant components.

[0029] Terms such as first and second may be used to describe various components, but the components are not limited to these terms. These terms may be used to distinguish one component from another. For example, a first element may be named a second element, and similarly, a second element may be named a first element, without departing from the scope of the rights described herein. The singular includes the plural unless the context clearly indicates otherwise.

[0030] Terms such as “under,” “beneath,” “over,” and the like are used to describe the relationship between components shown in the drawings. These terms have related concepts and are described based on directions shown in the drawings.

[0031] The terms "including", "having" and the like indicate the presence of features, numbers, steps, operations, elements, parts or a combination thereof described herein, and do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts or a combination thereof.

[0032] In addition, for ease of description, the present disclosure will be described with reference to an exemplary liquid crystal display (LCD) panel. However, the spirit of the present disclosure is not limited to LCD panels, but can also be applied to other types of display panels, such as organic light emitting display panels, mini LED display panels, etc.

[0033] In addition, for ease of description, the present disclosure will be described with reference to a direct light type liquid crystal display panel. However, the spirit of the present disclosure can also be applied to other types, for example, to a side light type liquid crystal display panel.

[0034] Figure 1 is an exploded perspective view illustrating a display panel according to an embodiment of the present disclosure. Figure 2 According to the embodiment of the present disclosure Figure 1 A cross-sectional view taken along line II in FIG. Figure 3 According to the embodiment of the present disclosure Figure 2 Magnified views of parts B and C in FIG.

[0035] Will refer to Figures 1 to 3 A display panel according to an embodiment of the present disclosure is described.

[0036] The display panel according to the present disclosure may include a panel layer 100 , a composite sheet 200 , a backlight driver 300 , and a housing 400 .

[0037] The panel layer 100 may include a lower substrate 130 provided with switching elements, an upper substrate 120 disposed on the lower substrate 130, an upper polarizing film 110 disposed on the upper portion of the upper substrate 120, and a lower polarizing film 140 disposed on the lower portion of the lower substrate 130. The display panel may be a liquid crystal panel, and the panel layer 100 may include a liquid crystal layer. In the lower substrate 130, pixels may be formed at each intersection of a gate line and a data line. The pixels may include a thin-film transistor, a common electrode, and a pixel electrode. The thin-film transistor may serve as a switching device that transmits and controls electrical signals to each pixel. A common voltage for driving the liquid crystal is applied to the common electrode. The pixel electrode may be disposed on a passivation layer covering the common electrode and connected to the thin-film transistor. The upper substrate 120 may include a color filter and a black matrix. R (red), G (green), and B (blue) patterns may be formed on the color filter. The black matrix may be disposed between the R, G, and B patterns of the color filter. Columnar spacers for maintaining a cell gap may be disposed between the upper substrate 120 and the lower substrate 130.

[0038] The upper polarizing film 110 may be attached to the upper portion of the upper substrate 120, and the lower polarizing film 140 may be provided at the lower portion of the lower substrate 130. The upper polarizing film 110 and the lower polarizing film 140 may have different polarization functions by being stretched in opposite directions, and may also have contraction forces in opposite directions due to the stretching. Due to the opposing contraction forces, the panel layer 100 may be flat without bending upward or downward.

[0039] The composite sheet 200 may be formed on the rear surface of the panel layer 100. The rear surface refers to the downward direction of the display panel and refers to the -Z axis direction. Figure 2 As shown, an adhesive layer AH is formed on a rear surface (−Z direction) of the lower polarizing film 140 formed on a lower portion of the panel layer 100 , and the composite sheet 200 may be attached to the rear surface of the adhesive layer AH.

[0040] The adhesive layer AH may be, for example, a pressure-sensitive adhesive PSA or an optically clear adhesive OCA, and may be a transparent material to allow light emitted from the light source module 320 to pass therethrough.

[0041] The composite sheet 200 may include a first supporting layer 210, a light refraction layer 220, a second supporting layer 230, and a side cover 270. Specifically, the first supporting layer 210 may be formed on the rear surface of the panel layer 100 and may be made of a first material. For example, the first material may be polyethylene terephthalate (PET). The light refraction layer 220 may be formed on the rear surface of the first supporting layer 210. The light refraction layer 220 may refract light emitted from the lower light source module 320 and diffuse the light upward. The light refraction layer 220 may include a plurality of prisms 221 arranged at regular intervals. The light refraction layer 220 may be formed of a second material. In other words, the plurality of prisms 221 may be formed of a second material. For example, the second material may be a transparent material such as glass or plastic. The second supporting layer 230 may be formed on the rear surface of the light refraction layer 220. The second supporting layer 230 may be formed of the same first material as the first supporting layer 210. In other words, in one example, the second supporting layer 230 may be formed of PET.

[0042] In the present disclosure, the material constituting the support layers 210 and 230 is referred to as a “first material,” and the material constituting the light refraction layer 220 is referred to as a “second material.” The first material and the second material may be different from or the same as each other.

[0043] Reference Figure 3 , the composite sheet 200 may include a plane portion P and an inclined portion S. Specifically, the inclined portion S may be formed along the outer peripheral surface of the composite sheet 200 (for example, at the edge of the composite sheet 200). In addition, the inclined portion S may be formed in the shape of a closed loop. The plane portion P may be the remaining portion other than the inclined portion S of the composite sheet 200, and may be a plane portion having a shape that is horizontal relative to the XY plane. The plane portion P is between the inclined portions S. The inclined portion S of the composite sheet 200 may be formed in an inverted conical shape. For example, referring to Figure 2 and Figure 3 The composite sheet 200 may have an inverted tapered shape in which the width of the upper surface is greater than the width of the lower surface. Here, the upper surface of the composite sheet 200 may refer to the upper surface of the first support layer 210, and the lower surface of the composite sheet 200 may refer to the lower surface of the second support layer 230.

[0044] The side cover 270 can be formed on the inclined portion S. The side cover 270 can be formed along the periphery of the composite sheet 200. Therefore, the side cover 270 can be formed along the side surface of the composite sheet 200 on the XY plane. Therefore, the side cover 270 can be formed in a closed loop shape. The side cover 270 can close (e.g., cover) the space H that can be formed in the light refraction layer 220. Specifically, when the light refraction layer 220 includes a plurality of prisms 221, due to the triangular shape of the prisms 221, the space H can be an opening formed between the prisms 221. Such a space can be an exposed space in the periphery (e.g., edge) of the composite sheet 200. Moisture may penetrate into this space H. In addition, due to capillary phenomena, moisture may spread to the entire composite sheet 200, which causes the quality of the display panel to deteriorate. The side cover 270 according to the present disclosure can be used to cover such a space H. The side cover 270 will be described in detail below.

[0045] like Figure 3 As shown, the size of the prisms 221 located in the outermost region may be different from the size of the prisms 221 located in other regions between the outermost regions of the composite sheet 200. For example, the prisms 221 located in the outermost region may have the smallest size among the prisms 221. Figure 3 , the width of the prism 221 located in the outermost area may be smaller than the width of the prism 221 located in the central area of ​​the composite sheet 200. Specifically, the width of the prism 221 adjacent to the side cover 270 may be smaller than the width of the prism 221 provided at a position corresponding to the central area of ​​the panel.

[0046] Return to reference Figure 2 , the composite sheet 200 may be directly attached to the rear surface of the panel layer 100. Direct attachment may mean that there is no space between the composite sheet 200 and the panel layer 100. Figure 2 As shown, the composite sheet 200 can be directly attached to the panel layer 100 via the adhesive layer AH. In contrast to the present disclosure, in conventional technology, in order to ensure a predetermined light path, the composite sheet 200 and the panel layer 100 are usually separated from each other by a predetermined distance. Unlike conventional technology, the display panel of the present disclosure ensures that light passing through the composite sheet 200 is sufficiently diffused based on its structural characteristics. Therefore, the composite sheet 200 can be directly attached without being separated from the panel layer 100.

[0047] At the same time, as will be described below, the housing 400 may include at least one of a housing top 410, a guide panel 420, and a cover bottom 430. Since the optical sheet and diffuser included in a conventional display panel are thick and heavy, the housing that forms the appearance of the display panel must support the diffuser in the vertical direction. For example, there is a general structure in which the guide panel has a protrusion or horizontal portion protruding in the horizontal direction, and the optical sheet or diffuser is supported in the vertical direction by the protrusion or horizontal portion. When a conventional display panel is exposed to a high or low temperature environment, the display panel, the optical sheet, and the diffuser shrink or expand. There is a problem that the brightness of the light is reduced because the degree of shrinkage or expansion of the display panel is different from that of the optical sheet or diffuser. In addition, there is also a problem that the diffuser is damaged due to friction caused by the shrinkage and expansion at the portion where the diffuser and the housing contact each other (so that the diffuser is supported by the housing).

[0048] According to the present disclosure, the composite sheet 200 can be directly attached to the panel layer 100. Therefore, the composite sheet 200 can be configured to be non-contact with the housing 400. That is, the composite sheet 200 does not contact the housing 400. Even when the display panel is exposed to a high or low temperature environment, the degree of contraction or expansion of the panel layer 100 is the same as the degree of contraction or expansion of the composite sheet 200, so the problem of reduced brightness can be reduced or prevented. In addition, since the composite sheet 200 according to the present disclosure can be not supported by the housing 400, when the composite sheet 200 contracts or expands, friction with the housing 400 does not occur.

[0049] The backlight driver 300 may include a lens 310 , a light source module 320 , a backlight circuit unit 330 , and a reflector 340 .

[0050] Each light source module 320 is arranged side by side so as to be spaced apart from each other. The light source module 320 irradiates light to the lower surface of the panel layer 100. Each light source module 320 can emit light simultaneously or individually according to the light source drive signal output from the backlight driver 330. For example, the light source module 320 can use local dimming to partially control the brightness. According to an example, the light source module 320 can be formed by a chip-scale package and can be directly mounted on the upper surface of the backlight circuit unit 330.

[0051] The lens 310 may be disposed on the light source module 320 and may diffuse light incident from the light source module 320. The lens 310 may be formed as an aspherical surface and may therefore have optical axis asymmetry. The lens 310 may prevent or at least reduce aberrations by having an aspherical surface. For example, the lens 310 may be configured to prevent or at least reduce hot spots and diffuse light by forming the upper surface into an elliptical shape and the central portion of the lower surface into a conical shape.

[0052] The reflector 340 is disposed below the light source module 320 and may be formed of a material having a reflective property. A portion of light emitted from the light source module 320 may travel in a downward direction, and the reflector 340 may reflect such light in an upward direction.

[0053] The housing 400 may include a housing top 410, a guide panel 420, and a cover bottom 430. The cover bottom 430 may define the lower appearance of the display panel. The cover bottom 430 may accommodate the backlight circuit unit 330 at its upper portion. The guide panel 420 may be coupled to the side surface of the cover bottom 430. The housing top 410 may define the side appearance of the display panel. The housing top 410 may be coupled to the side surface of the guide panel 420. The housing top 410 may partially cover the upper portion of the panel layer 100. To this end, the adhesive member 150 may be inserted between the housing top 410 and the panel layer 100.

[0054] As described above, the housing 400 according to the present disclosure does not contact the composite sheet 200. That is, the housing 400 may not have a structure for supporting the composite sheet 200. For example, the guide panel of a conventional display panel, which has a horizontal portion or protrusion for supporting the panel layer, may be omitted. For another example, the guide panel 420 according to the present disclosure may not include a horizontal portion or protrusion for supporting the panel layer 100.

[0055] Figures 4 to 6 : is a view for explaining a method for producing a composite sheet according to an embodiment of the present disclosure. Specifically, Figure 4 is a perspective view of a production composite sheet according to an embodiment of the present disclosure, Figure 5 is a plan view viewed from the XZ plane when the composite sheet according to the embodiment of the present disclosure is produced, and Figure 6 It is a plan view viewed from the YZ plane when the composite sheet according to the embodiment of the present disclosure is produced.

[0056] Will refer to Figures 4 to 6 A method for producing a composite sheet according to an embodiment of the present disclosure is described.

[0057] First, refer to Figure 4 , a composite sheet 200P including a first supporting layer 210P, a light refraction layer 220P, and a second supporting layer 230P may be attached on the rear surface of the panel layer 100 .

[0058] Specifically, the first supporting layer 210P may be a planar layer including a first material, such as a PET material.

[0059] The light refraction layer 220P may be formed on the first supporting layer 210P. The light refraction layer 220P may include a plurality of light refraction elements 221 and may be a planar layer. For example, the light refraction elements 221 may be prisms. The light refraction layer 220P may be formed from the second material. In other words, the light refraction elements 221 may be formed from the second material. In other words, the prisms 221 may be formed from the second material.

[0060] The second support layer 230P may be formed on the light refraction layer 220P. The second support layer 230P may be a plane-shaped layer including a first material. For example, the first material may be a PET material.

[0061] The composite sheet 200P thus formed may have a space H exposed on its side surface. For example, when the light-refractive element is a prism 221, a space H not filled with the second material may exist between a particular prism 221 and a prism 221 adjacent to the particular prism 221, and the space H may be exposed on the side surface of the composite sheet 200P. As described above, the space H may cause moisture to penetrate therein.

[0062] The composite sheet 200P formed as described above may be attached to the rear surface of the panel layer 100. The rear surface refers to the downward direction of the display panel and may be in reference to the rear surface of the panel layer 100. Figure 4 In the -Z axis direction. For example, the composite sheet 200P may be inserted on the adhesive layer AH applied on the rear surface of the panel layer 100, and the adhesive layer AH may be cured. The adhesive layer AH may be an OCA material or a PSA material.

[0063] By irradiating the laser beam L that penetrates the second support layer 230P, the light refraction layer 220P, and the first support layer 210P, the composite sheet 200P may be cut obliquely. Figure 4 , the laser beam L can be irradiated on the composite sheet 200P and move along the cutting line CL. Figure 5 and Figure 6 , the laser beam L can be irradiated at a predetermined angle relative to the vertical direction (Z axis). The irradiated light can have a wavelength capable of melting the second supporting layer 230P, the light refraction layer 220P, and the first supporting layer 210P. In addition, because the laser beam L is tilted at a predetermined angle, the cross-section of the cut composite sheet 200P can have an inclined portion relative to the vertical direction (Z axis). In one embodiment, the predetermined angle relative to the X axis is greater than 0 degrees and less than 90 degrees.

[0064] In the above oblique cutting step, at least one layer of the second support layer 230P, the light refraction layer 220P, and the first support layer 210P may be melted, and a side cover may be formed by melting (see Figure 7270 etc.). According to the present disclosure, the step of oblique cutting can have the following technical significance. Figures 2 to 3 As described, the composite sheet 200 according to the present disclosure may have an inclined portion S at an edge portion thereof. Figure 7 As will be described, the side cover 270 formed on the inclined portion S may include a first extension material formed by melting and extending the first material of the first support layer 210P, a second extension material formed by melting and extending the second material of the light refraction layer 220P, and a third extension material formed by melting and extending the first material of the second support layer 230P. The melted first extension material, the second extension material, or the third extension material can be solidified while flowing downward along the inclined surface to form a side cover. The side cover formed in this manner can be used to close the space H exposed at the side surface of the composite sheet 200P. Unlike what is presented in the present disclosure, when vertical cutting is performed, such as by irradiating a laser beam L in a vertical direction (Z-axis direction), the composite sheet 200P will be divided into left and right only with respect to the vertical plane irradiated by the laser beam L, and the first extension material, the second extension material, or the third extension material to be formed on the inclined portion S will not be formed thereon. In addition, unlike the present disclosure, when vertical cutting is performed using the laser beam L, the melted first extension material or the second extension material may fall due to gravity and only deposit on the first support layer 210P, and not on the light refraction layer 220P. Therefore, the space exposed at the side surface of the composite sheet 200P may not be properly enclosed. According to the present disclosure, by cutting the composite sheet 200P at an angle, a side cover capable of enclosing all the spaces H can be formed.

[0065] In addition, refer to Figure 4 , the side cover can be formed to form a closed loop along the periphery of the composite sheet 200P. That is, the laser beam L can move along the cutting line CL to form a closed loop along the periphery of the composite sheet 200P, and thus the side cover can be formed to form a closed loop along the periphery of the composite sheet 200P. Therefore, the space H exposed at the side surface of the composite sheet 200P can be completely enclosed or covered.

[0066] In addition, refer to Figure 4, the side cover can be formed so that circles R1, R2, R3, and R4 are formed at the corners of the composite sheet 200P. That is, the laser beam L can move along the cutting line CL, and the cutting line CL draws circles R1, R2, R3, and R4 at the four corners on the plane of the composite sheet 200P. According to the present disclosure, forming circles at the corners of the composite sheet 200P can have the following technical significance. When the laser beam L does not move as the circles are drawn at the corners, the composite sheet 200P receives the laser beam twice at the corner. For example, when the laser beam L moves in the counterclockwise direction, the corner R1 receives the laser beam once in the -Y axis direction and again in the X axis direction. The two receptions of the laser beam can also occur in the remaining corners R2, R3, and R4. Therefore, the panel layer 100 inserted under the composite sheet 200P is irradiated by the laser beam twice at the corner. The problem of the panel layer 100 being damaged by multiple laser beams may occur. In addition, since the side cover may be formed irregularly due to the double melting at the corners of the composite sheet 200P, according to the present disclosure, by forming the side cover in a manner of forming rounded shapes R1, R2, R3, and R4 at the corners of the composite sheet 200P, damage to the panel layer 100 can be reduced or prevented, and the problem of the side cover being formed irregularly can be prevented.

[0067] Figure 7 is a perspective view illustrating a composite sheet according to an embodiment of the present disclosure. Figures 8 to 10 According to the embodiment of the present disclosure Figure 7 A cross-sectional view taken along the cutting line AA' in the composite sheet. Figure 11 According to the embodiment of the present disclosure Figure 7 A cross-sectional view taken along the cutting line B1-B1' in the composite sheet. Figure 12 According to the embodiment of the present disclosure Figure 7 A cross-sectional view taken along the cutting line B2-B2' in the composite sheet.

[0068] Will refer to Figures 7 to 12 A composite sheet according to an embodiment of the present disclosure is described.

[0069] The composite sheet 200 may include a first supporting layer 210 , a light refraction layer 220 , a second supporting layer 230 , and a side cover 270 . Figure 7 2 is a perspective view, and the side cover 270 formed to surround the outer peripheral surface of the composite sheet 200 is omitted. Figures 8 to 12 The side cover 270 is described.

[0070] The first support layer 210 may be formed on the rear surface of the panel layer 100. The rear surface refers to a downward direction of the display panel 100 and may be in the direction of the display panel 100. Figure 7The first support layer 210 may be attached to the rear surface of the panel layer 100 through an adhesive layer AH. The adhesive layer AH may be a transparent material such as PSA or OCA.

[0071] The first supporting layer 210 may be formed of a first material, such as PET.

[0072] The light refraction layer 220 may be formed on the rear surface of the first supporting layer 210. The light refraction layer 220 may refract light emitted from the lower light source module and diffuse the light upward. The light refraction layer 220 may include a plurality of prisms 221 arranged at regular intervals. The light refraction layer 200 may be formed from a second material. In other words, the plurality of prisms 221 may be formed from the second material. For example, the second material may be a transparent material such as glass or plastic. The first material and the second material may be the same material or different materials.

[0073] The second supporting layer 230 may be formed on the rear surface of the light refraction layer 220. The second supporting layer 230 may be formed of a first material that is the same material as the first supporting layer 210. That is, the second supporting layer 230 may be formed of a PET material.

[0074] like Figures 8 to 12 As shown, the composite sheet 200 may include an inclined portion S and a plane portion P. A side cover 270 may be formed on the inclined portion S. The inclined portion S may be formed along the outer peripheral surface of the composite sheet 200. The inclined portion S may be formed in a closed loop shape around the periphery of the composite sheet 200. The plane portion P may be a portion other than the inclined portion S of the composite sheet 200, and may be a plane portion extending horizontally relative to the XY plane. The inclined portion S of the composite sheet 200 may have an inverted conical shape in the Z-axis direction. That is, the width of the upper surface of the composite sheet 200 (the surface in contact with the panel layer 100) may be longer than the width of the lower surface. The side cover 270 may enclose all spaces H exposed to the outside along the periphery of the composite sheet 200. This will be referred to below Figures 8 to 12 Provide a description.

[0075] Return to reference Figure 7 The side cover 270 may have rounded shapes R1, R2, R3, and R4 at the corners of the composite sheet 200. Since the side cover 270 has the rounded shapes R1, R2, R3, and R4, it is possible to reduce or prevent damage to the panel layer 100 that may occur during the laser beam cutting process. Furthermore, the side cover 270 having the rounded shapes R1, R2, R3, and R4 can prevent surface irregularities that may occur during the laser beam cutting process.

[0076] Figures 8 to 10 According to various embodiments Figure 7A cross-sectional view taken along the cutting line AA' in the composite sheet. Figure 11 According to one embodiment, Figure 7 A cross-sectional view taken along the cutting line B1-B1' in the composite sheet. Figure 12 According to one embodiment, Figure 7 A cross-sectional view taken along the cutting line B2-B2' in the composite sheet. Figures 8 to 12 In the description of , descriptions that are repeated with the above description will be omitted.

[0077] Reference Figure 8 , shows a composite sheet 200 attached to the rear surface of the panel layer 100 via an adhesive layer AH. The composite sheet 200 may include a planar portion P and an inclined portion S. The composite sheet 200 may include, in the planar portion P, a first supporting layer 210 formed on the rear surface of the panel layer 100 and made of a first material, a light refraction layer 220 formed on the rear surface of the first supporting layer 210 and made of a second material, and a second supporting layer 230 formed on the rear surface of the light refraction layer 220 and made of the first material. The composite sheet 200 may also include a side cover 270 formed on the inclined portion S. The side cover 270 may include a first extension material 210S and a third extension material 230S. The first extension material 210S may be a material formed by melting the material of the first supporting layer 210 and extending it toward the inclined portion S. The first extension material 210S may be the first material constituting the first supporting layer 210. The third extension material 230S may be a material formed by melting the material of the second supporting layer 230 and extending it toward the inclined portion S. The third extension material 230S may be the first material constituting the second supporting layer 230. The space H formed at the side surface of the composite sheet 200 may be completely enclosed by the side cover 270 formed in this manner. Since the side cover 270 is formed in a closed loop shape along the periphery of the side surface of the composite sheet 200, the composite sheet 200 may be completely sealed. Therefore, any moisture that may penetrate through the space H may be completely blocked.

[0078] At the same time, Figure 8 In the cross-sectional view shown, the second material constituting the light refraction layer 220 may not be melted. For example, the cutting line CL of the laser beam may be formed so as not to pass through the prism 221. For another example, the laser beam may have a wavelength that only melts the support layers 210 and 230 without melting the prism 221. Therefore, the side cover 270 may include a third extension material 230S formed so as to invade the light refraction layer 220 and the first support layer 210. That is, when assuming a virtual line VL1 between the second support layer 230 and the light refraction layer 220 and assuming a virtual line VL2 between the light refraction layer 220 and the first support layer 210, the third extension material 230S may be formed so as to invade (e.g., pass through) the virtual line VL1 and the virtual line VL2.

[0079] Reference Figure 9 , shows a composite sheet 200 attached to the rear surface of the panel layer 100 via an adhesive layer AH. The composite sheet 200 may include a planar portion P and an inclined portion S. The composite sheet 200 may include, in the planar portion P, a first supporting layer 210 formed on the rear surface of the panel layer 100 and made of a first material, a light refraction layer 220 formed on the rear surface of the first supporting layer 210 and made of a second material, and a second supporting layer 230 formed on the rear surface of the light refraction layer 220 and made of the first material. The composite sheet 200 may also include a side cover 270 formed on the inclined portion S. The side cover 270 may include a first extension material 210S, a second extension material 220S, and a third extension material 230S. The first extension material 210S may be a material formed by melting the material of the first supporting layer 210 and extending it toward the inclined portion S. The first extension material 210S may be the first material constituting the first supporting layer 210. The second extension material 220S may be a material formed by melting the material of the light refraction layer 220 and extending it toward the inclined portion S. The second extension material 220S may be the second material constituting the light refraction layer 220 or the prisms 221. The third extension material 230S may be a material formed by melting the material of the second support layer 230 and extending it toward the inclined portion S. The third extension material 230S may be the first material constituting the second support layer 230. The space H formed on the side surface of the composite sheet 200 may be completely enclosed by the side cover 270 formed in this manner. Since the side cover 270 is formed in a closed loop shape along the periphery of the side surface of the composite sheet 200, the composite sheet 200 may be completely sealed. Therefore, the inflow of any moisture that may penetrate through the space H can be completely blocked.

[0080] At the same time, Figure 9 In the cross-sectional view shown, Figure 10 Compared to the cross-sectional view of the optical refraction layer 220, the second material constituting the optical refraction layer 220 may be relatively less melted, as will be described below. For example, the cutting line CL of the laser beam may be formed so that a small portion of the prism 221 remains on the inclined portion S, and a large portion of the prism 221 remains on the flat portion P. Therefore, the side cover 270 may include a third extension material 230S formed to intrude (e.g., pass through) the optical refraction layer 220 and the first supporting layer 210, and a second extension material 220S formed to intrude (e.g., pass through) the first supporting layer 210. That is, when assuming a virtual line VL1 between the second supporting layer 230 and the optical refraction layer 220 and a virtual line VL2 between the optical refraction layer 220 and the first supporting layer 210, the third extension material 230S may be formed to intrude (e.g., pass through) both the virtual line VL1 and the virtual line VL2. Furthermore, the second extension material 220S may be formed to intrude (e.g., pass through) the virtual line VL2.

[0081] Reference Figure 10 , shows a composite sheet 200 attached to the rear surface of the panel layer 100 via an adhesive layer AH. The composite sheet 200 may include a planar portion P and an inclined portion S. The composite sheet 200 may include, in the planar portion P, a first supporting layer 210 formed on the rear surface of the panel layer 100 and made of a first material, a light refraction layer 220 formed on the rear surface of the first supporting layer 210 and made of a second material, and a second supporting layer 230 formed on the rear surface of the light refraction layer 220 and made of the first material. The composite sheet 200 may also include a side cover 270 formed on the inclined portion S. The side cover 270 may include a first extension material 210S, a second extension material 220S, and a third extension material 230S. The first extension material 210S may be a material formed by melting the material of the first supporting layer 210 and extending it toward the inclined portion S. The first extension material 210S may be the first material constituting the first supporting layer 210. The second extension material 220S may be a material formed by melting the material of the light refraction layer 220 and extending it toward the inclined portion S. The second extension material 220S may be the second material constituting the light refraction layer 220 or the prisms 221. The third extension material 230S may be a material formed by melting the material of the second support layer 230 and extending it toward the inclined portion S. The third extension material 230S may be the first material constituting the second support layer 230. The space H formed on the side surface of the composite sheet 200 may be completely enclosed by the side cover 270 formed in this manner. Since the side cover 270 is formed in a closed loop shape along the periphery of the side surface of the composite sheet 200, the composite sheet 200 may be completely sealed. Therefore, the inflow of any moisture that may penetrate through the space H can be completely blocked.

[0082] At the same time, Figure 10 In the cross-sectional view shown, Figure 9 Compared with the cross-sectional view of FIG, the second material constituting the light refraction layer 220 may be melted more. For example, the cutting line CL of the laser beam may be formed so that most of the prism 221 remains on the inclined portion S and a small portion of the prism 221 remains on the flat portion P. Therefore, the side cover 270 may include the third extension material 230S formed to invade the light refraction layer 220 and the second extension material 220S formed to invade the first support layer 210. Figure 9 Compared to the cross-sectional view of FIG, the third extension material 230S is different in that it does not invade (eg, pass through) the first support layer 210. That is, in Figure 10 In, with Figure 9In contrast, a relatively large amount of the second material is melted, so the second extension material 220S may be formed wider, and thus, the third extension material 230S may be formed to an upper portion of the material 220S so that the second extension material 220S is between the first extension material 210S and the third extension material 230S.

[0083] That is, when a virtual line VL1 is assumed between the second supporting layer 230 and the light refraction layer 220, and a virtual line VL2 is assumed between the light refraction layer 220 and the first supporting layer 210, the third extension material 230S may be formed to intrude into the virtual line VL1 but not into the virtual line VL2. In addition, the second extension material 220S may be formed to intrude into the virtual line VL2. That is, the third extension material 230S may be formed to not intrude into the virtual line VL2.

[0084] Reference Figure 11 , shows a composite sheet 200 attached to the rear surface of the panel layer 100 via an adhesive layer AH. The composite sheet 200 may include a planar portion P and an inclined portion S. The composite sheet 200 may include, in the planar portion P, a first supporting layer 210 formed on the rear surface of the panel layer 100 and made of a first material, a light refraction layer 220 formed on the rear surface of the first supporting layer 210 and made of a second material, and a second supporting layer 230 formed on the rear surface of the light refraction layer 220 and made of the first material. The composite sheet 200 may also include a side cover 270 formed on the inclined portion S. The side cover 270 may include a first extension material 210S, a second extension material 220S, and a third extension material 230S. The first extension material 210S may be a material formed by melting the material of the first supporting layer 210 and extending it toward the inclined portion S. The first extension material 210S may be the first material constituting the first supporting layer 210. The second extension material 220S may be a material formed by melting the material of the light refraction layer 220 and extending it toward the inclined portion S. The second extension material 220S may be the second material constituting the light refraction layer 220 or the prisms 221. The third extension material 230S may be a material formed by melting the material of the second support layer 230 and extending it toward the inclined portion S. The third extension material 230S may be the first material constituting the second support layer 230. The space H formed on the side surface of the composite sheet 200 may be completely enclosed by the side cover 270 formed in this manner. Since the side cover 270 is formed in a closed loop shape along the periphery of the side surface of the composite sheet 200, the composite sheet 200 may be completely sealed. Therefore, the inflow of any moisture that may penetrate through the space H can be completely blocked.

[0085] At the same time, due to Figure 11 The cross-section shown is along Figure 7The cross-sectional view in the direction B1-B1' of the second refractive layer 220 is shown, and thus the prism 221 is inserted over the entire cross-sectional view of the second refractive layer 220. That is, the cross-sectional view of the second refractive layer 220 in the plane portion P may completely include the prism 221. Therefore, the cross-sectional view of the inclined portion S may be the same as that of the second refractive layer 220. Figure 10 The cross-sections of the prism 221 are the same or similar. The cutting line CL of the laser beam can be formed to pass through all parts of the prism 221. Therefore, the side cover 270 can include a third extension material 230S formed to intrude into the light refraction layer 220 and a second extension material 220S formed to intrude into the first support layer 210. In other words, the third extension material 230S can be formed only to the upper portion of the second extension material 220S. When assuming a virtual line VL1 between the second support layer 230 and the light refraction layer 220 and a virtual line VL2 between the light refraction layer 220 and the first support layer 210, the third extension material 230S can be formed to intrude only into the virtual line VL1. In addition, the second extension material 220S can be formed to intrude into the virtual line VL2. In other words, the third extension material 230S can be formed so as not to intrude into the virtual line VL2.

[0086] Reference Figure 12 , shows a composite sheet 200 attached to the rear surface of the panel layer 100 via an adhesive layer AH. The composite sheet 200 may include a planar portion P and an inclined portion S. The composite sheet 200 may include, in the planar portion P, a first supporting layer 210 formed on the rear surface of the panel layer 100 and made of a first material, a light refraction layer 220 formed on the rear surface of the first supporting layer 210 and made of a second material, and a second supporting layer 230 formed on the rear surface of the light refraction layer 220 and made of the first material. The composite sheet 200 may also include a side cover 270 formed on the inclined portion S. The side cover 270 may include a first extension material 210S and a third extension material 230S. The first extension material 210S may be a material formed by melting the material of the first supporting layer 210 and extending it toward the inclined portion S. The first extension material 210S may be the first material constituting the first supporting layer 210. The third extension material 230S may be a material formed by melting the material of the second supporting layer 230 and extending it toward the inclined portion S. The third extension material 230S may be the first material constituting the second supporting layer 230. The space H formed at the side surface of the composite sheet 200 may be completely enclosed by the side cover 270 formed in this manner. Since the side cover 270 is formed in a closed loop shape along the periphery of the side surface of the composite sheet 200, the composite sheet 200 may be completely sealed. Therefore, any moisture that may penetrate through the space H may be completely blocked.

[0087] At the same time, due to Figure 12 The cross-section shown is along Figure 7The prism 221 is not inserted over the entire second refractive layer 220. Therefore, the cross section of the inclined portion S may be the same as that of the second refractive layer 220. Figure 8 The cross-sections of the optical refraction layer 220 and the optical refraction layer 220 are the same or similar. The cutting line CL of the laser beam can be formed so as not to pass through the prism 221. Therefore, the side cover 270 can include the third extension material 230S formed so as to invade the optical refraction layer 220 and the first support layer 210. In other words, the side cover 270 does not include the second extension material in which the second material of the optical refraction layer 220 is melted. When assuming a virtual line VL1 between the second support layer 230 and the optical refraction layer 220 and a virtual line VL2 between the optical refraction layer 220 and the first support layer 210, the third extension material 230S can be formed so as to invade the virtual line VL1 and the virtual line VL2.

[0088] Figure 13 is a perspective view illustrating a composite sheet according to another embodiment of the present disclosure. Figure 14 According to other embodiments of the present disclosure Figure 13 An enlarged view of portion D of the composite sheet is shown.

[0089] Will refer to Figure 13 and Figure 14 Another embodiment of the present disclosure is described.

[0090] Figure 13 and Figure 14 With reference Figure 7 The described embodiment is different in that the light refraction layer 220 includes hetero prisms 221 and 222. Descriptions overlapping with the above-described embodiment will be omitted.

[0091] The composite sheet 200 may include a first supporting layer 210 , a light refraction layer 220 , and a side cover 270 . Figure 13 2 is a perspective view, and the side cover 270 formed to surround the outer peripheral surface of the composite sheet 200 is omitted. Figures 8 to 12 The side cover 270 will be understood from the description.

[0092] The first supporting layer 210 is formed on the rear surface of the panel layer 100 and may be attached to the rear surface of the panel layer 100 through the adhesive layer AH. The first supporting layer 210 may be formed of a first material, and the first material may be PET.

[0093] The light refraction layer 220 may be formed on the rear surface of the first supporting layer 210. The light refraction layer 220 may include a plurality of special-shaped prisms 221 and 222 arranged at regular intervals.

[0094] The first prism 221 may have a first height H1. The second prism 222 may have a second height H2. Each of the plurality of prisms 221 and 222 may be spaced apart from each other by a predetermined distance P. For example, the height H1 of the first prism 221 may be 70 μm, and the height of the second prism 222 may be 60 μm. The distance P between the prisms 221 and 222 may be 35 μm.

[0095] The width W of the first prism 221 may be the same as the width W of the second prism 222. That is, the first prism 221 may have a first width W, and the second prism 222 may also have a first width W. By way of example, the first width W may be 35 μm. Since the first prism 221 and the second prism 222 have the same width W and different heights H1 and H2, they may have different tilt angles a and b. That is, the tilt angle a of the first prism 221 may be different from the tilt angle b of the second prism 222. Figure 14 , light traveling from the bottom to the top is refracted horizontally when passing through the first prism 221 and the second prism 222. At this time, due to the different inclination angles a and b of the first prism 221 and the second prism 222, the refraction angles of the light passing through the first prism 221 and the light passing through the second prism 222 are different from each other. Therefore, the diffusion rate of light passing through the composite sheet 200 can be increased.

[0096] Figure 15 is a perspective view illustrating a composite sheet according to another embodiment of the present disclosure. Figure 16 Shown along other embodiments according to the present disclosure Figure 15 Cross section of the composite sheet in the EE' direction.

[0097] Will refer to Figure 15 and Figure 16 Another embodiment of the present disclosure is described. Figure 15 is a perspective view according to the present embodiment, and the side cover 270 formed to surround the outer peripheral surface of the composite sheet 200 is omitted. Figure 16 The side cover 270 will be understood from the cross section.

[0098] The first support layer 210 may be formed on the rear surface of the panel layer 100. The rear surface refers to a downward direction of the display panel 100 and may be in the direction of the display panel 100. Figure 15 The first support layer 210 may be attached to the rear surface of the panel layer 100 through the adhesive layer AH.

[0099] The first supporting layer 210 may be formed of a first material, such as PET.

[0100] The light refraction layer 220 may be formed on the rear surface of the first supporting layer 210. The light refraction layer 220 may refract and diffuse light traveling along the Z-axis direction. The light refraction layer 220 may include a plurality of prisms 221 arranged at regular intervals. The light refraction layer 220 may be formed from a second material. In other words, the plurality of prisms 221 may be formed from a second material. The second material may be glass or plastic, and may be a transparent material. The first material and the second material may be the same material or different materials.

[0101] The second supporting layer 230 may be formed on the rear surface of the light refraction layer 220. The second supporting layer 230 may be formed of a first material that is the same material as that of the first supporting layer 210. The second supporting layer 230 may be formed of a PET material.

[0102] The second light refraction layer 240 may be formed on the rear surface of the second supporting layer 230. The second light refraction layer 240 may include a plurality of prisms 221 arranged at regular intervals. The second light refraction layer 240 may refract and diffuse light traveling along the Z-axis direction. The second light refraction layer 240 may be formed of a second material. In other words, the plurality of prisms 221 may be formed of a second material.

[0103] The third supporting layer 250 may be formed on the rear surface of the second light refraction layer 240. The third supporting layer 250 may be formed of a first material that is the same as the first supporting layer 210 and the second supporting layer 230. The third supporting layer 250 may be formed of a PET material.

[0104] like Figure 15 As shown, the light refraction layer 220 may include a plurality of prisms 221 extending along the Y-axis direction, where the Y-axis direction is the first direction. The second light refraction layer 240 may include a plurality of prisms 221 also extending along the Y-axis direction as the first direction. That is, the plurality of prisms 221 provided on the light refraction layer 220 may be formed to extend in the same direction as the plurality of prisms 221 provided on the second light refraction layer 240.

[0105] Reference Figure 16 , the composite sheet 200 may include an inclined portion S and a plane portion p. The side cover 270 may be formed on the inclined portion S. The inclined portion S may be formed along the outer peripheral surface of the composite sheet 200. The inclined portion S may be formed in a closed loop shape. The plane portion P may be a portion other than the inclined portion S of the composite sheet 200, and may be a plane portion extending horizontally relative to the XY plane. The inclined portion S of the composite sheet 200 may have an inverted tapered shape in the Z-axis direction. That is, the width of the upper surface of the composite sheet 200 (the surface in contact with the panel layer 100) may be longer than the width of the lower surface. The side cover 270 may enclose all spaces H exposed to the outside along the periphery of the composite sheet 200.

[0106] Return to reference Figure 15 The side cover 270 may have rounded shapes R1, R2, R3, and R4 at the corners of the composite sheet 200. Since the side cover 270 has the rounded shapes R1, R2, R3, and R4, it is possible to reduce or prevent damage to the panel layer 100 that may occur during the laser beam cutting process. Furthermore, the side cover 270 having the rounded shapes R1, R2, R3, and R4 can prevent surface irregularities that may occur during the laser beam cutting process.

[0107] According to the present disclosure, the side cover 270 may include a material formed to extend to the inclined portion S by melting at least one of the first supporting layer 210 , the light refraction layer 220 , the second supporting layer 230 , the second light refraction layer 240 , and the third supporting layer 250 . Figure 16 is an exemplary view in which the side cover 270 is shown to include a first extension material 210S formed in a manner that the first support layer 210 is melted and extended, a third extension material 230S formed in a manner that the second support layer 230 is melted and extended, a fourth extension material 240S formed in a manner that the second light refraction layer 240 is melted and extended, and a fifth extension material 250S formed in a manner that the third support layer 250 is melted and extended. However, as described above with reference to Figures 8 to 10 As described, the side cover 270 may have cross-sections of various shapes depending on the cutting position and the position of the cutting line of the laser beam, and the like.

[0108] Figure 17 is a perspective view illustrating a composite sheet according to another embodiment of the present disclosure. Figure 18 Shown along Figure 17 The cross section of the composite sheet in the F-F' direction.

[0109] Will refer to Figure 17 and Figure 18 Another embodiment of the present disclosure is described. Figure 17 is a perspective view according to the present embodiment, and the side cover 270 formed to surround the outer peripheral surface of the composite sheet 200 is omitted. Figure 18 The side cover 270 will be understood from the cross section.

[0110] The first support layer 210 may be formed on the rear surface of the panel layer 100. The rear surface refers to a downward direction of the display panel 100 and may be in the direction of the display panel 100. Figure 17 The first support layer 210 may be attached to the rear surface of the panel layer 100 through the adhesive layer AH.

[0111] The first supporting layer 210 may be formed of a first material, such as PET.

[0112] The light refraction layer 220 may be formed on the rear surface of the first supporting layer 210. The light refraction layer 220 may refract and diffuse light traveling along the Z-axis direction. The light refraction layer 220 may include a plurality of prisms 221 arranged at regular intervals. The light refraction layer 220 may be formed from a second material. In other words, the plurality of prisms 221 may be formed from a second material. The second material may be glass or plastic, and may be a transparent material. The first material and the second material may be the same material or different materials.

[0113] The second supporting layer 230 may be formed on the rear surface of the light refraction layer 220. The second supporting layer 230 may be formed of a first material that is the same material as that of the first supporting layer 210. The second supporting layer 230 may be formed of a PET material.

[0114] The second light refraction layer 240 may be formed on the rear surface of the second supporting layer 230. The second light refraction layer 240 may include a plurality of prisms 221 arranged at regular intervals. The second light refraction layer 240 may refract and diffuse light traveling along the Z-axis direction. The second light refraction layer 240 may be formed of a second material. In other words, the plurality of prisms 221 may be formed of a second material.

[0115] The third supporting layer 250 may be formed on the rear surface of the second light refraction layer 240. The third supporting layer 250 may be formed of a first material that is the same as the first supporting layer 210 and the second supporting layer 230. The third supporting layer 250 may be formed of a PET material.

[0116] like Figure 17 As shown, the light refraction layer 220 may include a plurality of prisms 221 extending along the X-axis direction, where the X-axis direction is the first direction. The second light refraction layer 240 may include a plurality of prisms 221 extending along the Y-axis direction, where the Y-axis direction is the second direction. In other words, the plurality of prisms 221 provided on the light refraction layer 220 may be formed to extend in a direction different from the plurality of prisms 221 provided on the second light refraction layer 240.

[0117] Reference Figure 18 , the composite sheet 200 may include an inclined portion S and a plane portion P. The side cover 270 may be formed on the inclined portion S. The inclined portion S may be formed along the outer peripheral surface of the composite sheet 200. The inclined portion S may be formed in a closed loop shape. The plane portion P may be a portion other than the inclined portion S of the composite sheet 200, and may be a plane portion extending horizontally relative to the XY plane. The inclined portion S of the composite sheet 200 may have an inverted tapered shape in the Z-axis direction. That is, the width of the upper surface of the composite sheet 200 (the surface in contact with the panel layer 100) may be longer than the width of the lower surface. The side cover 270 may enclose all spaces H exposed to the outside along the periphery of the composite sheet 200.

[0118] Return to reference Figure 17 The side cover 270 may have rounded shapes R1, R2, R3, and R4 at the corners of the composite sheet 200. Since the side cover 270 has the rounded shapes R1, R2, R3, and R4, it is possible to reduce or prevent damage to the panel layer 100 that may occur during the laser beam cutting process. Furthermore, the side cover 270 having the rounded shapes R1, R2, R3, and R4 can prevent surface irregularities that may occur during the laser beam cutting process.

[0119] According to the present disclosure, the side cover 270 may include a material formed to extend to the inclined portion S by melting at least one of the first supporting layer 210 , the light refraction layer 220 , the second supporting layer 230 , the second light refraction layer 240 , and the third supporting layer 250 . Figure 18 is an exemplary view in which the side cover 270 is shown to include a first extension material 210S formed in a manner that the first support layer 210 is melted and extended, a second extension material 220S formed in a manner that the light refraction layer 220 is melted and extended, a third extension material 230S formed in a manner that the second support layer 230 is melted and extended, a fourth extension material 240S formed in a manner that the second light refraction layer 240 is melted and extended, and a fifth extension material 250S formed in a manner that the third support layer 250 is melted and extended. However, as described above with reference to Figures 8 to 10 As described, the side cover 270 may have cross-sections of various shapes depending on the cutting position and the position of the cutting line of the laser beam, and the like.

[0120] Although the embodiments of the present invention have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that the technical configuration of the present invention can be implemented in other detailed forms without changing the technical spirit or basic features of the present invention. Therefore, it should be noted that the above-mentioned embodiments are provided as examples and should not be interpreted as limitations. In addition, the scope of the present invention should be defined by the appended claims rather than the detailed description provided above. In addition, the meaning and scope of the claims and all changes or modifications derived from their equivalents should be interpreted as falling within the scope of the present invention.

Claims

1. A method for producing a composite sheet, comprising: forming a first supporting layer; forming a light refraction layer on the first supporting layer, wherein the light refraction layer comprises a plurality of light refraction elements; forming a second supporting layer on the light refractive layer, wherein the first supporting layer, the light refractive layer and the second supporting layer together form a composite sheet; attaching the composite sheet to the rear surface of the panel layer; and The composite sheet is cut obliquely by irradiating a laser beam that penetrates the second supporting layer, the light refractive layer, and the first supporting layer, the irradiation of the laser beam covering the opening at the edge of the light refractive layer, Among them, cutting includes: A side cover is formed by melting at least one of the second supporting layer, the light refractive layer, and the first supporting layer.

2. The method for producing a composite sheet according to claim 1, wherein: The side cover is formed around the periphery of the composite sheet.

3. The method for producing a composite sheet according to claim 1, wherein: Forming the side cover includes: Rounded corners of the composite sheet are formed.

4. A display panel comprising: Panel layer; a composite sheet on the rear surface of the panel layer, the composite sheet comprising a planar portion and an inclined portion; as well as a housing in which the panel layer and the composite sheet are arranged, Wherein, the composite sheet comprises: a first support layer on the rear surface of the panel layer, the first support layer comprising a first material; a light refracting layer on a rear surface of the first supporting layer, the light refracting layer comprising a second material; a second supporting layer on a rear surface of the light refractive layer, the second supporting layer comprising the first material; and a side cover on the inclined portion of the composite sheet, the side cover covering an opening at an edge of the light refractive layer, wherein the side cover comprises a third extended material extending from the first material of the second supporting layer, and The third extension material passes through a virtual line extending from the light refraction layer to the inclined portion and a virtual line extending from the first supporting layer to the inclined portion.

5. The display panel according to claim 4, wherein: The side cover further includes a first extension material extending from the first material of the first supporting layer. The display panel according to claim 4 , wherein: The side cover further includes a second extension material extending from the second material of the light refraction layer, The second extension material passes through a virtual line extending from the first support layer to the inclined portion, but does not pass through a virtual line extending from the light refraction layer to the inclined portion.

7. A display panel comprising: Panel layer; a composite sheet on the rear surface of the panel layer, the composite sheet comprising a planar portion and an inclined portion; as well as a housing in which the panel layer and the composite sheet are arranged, Wherein, the composite sheet comprises: a first support layer on the rear surface of the panel layer, the first support layer comprising a first material; a light refracting layer on a rear surface of the first supporting layer, the light refracting layer comprising a second material; a second supporting layer on a rear surface of the light refractive layer, the second supporting layer comprising the first material; and a side cover on the inclined portion of the composite sheet, the side cover covering an opening at an edge of the light refractive layer, wherein the side cover comprises a second extending material extending from the second material of the light refraction layer and a third extending material extending from the first material of the second supporting layer, and The third extension material passes through a virtual line extending from the light refraction layer to the inclined portion, and the second extension material passes through a virtual line extending from the first support layer to the inclined portion.

8. The display panel according to claim 7, wherein: The side cover is arranged around the periphery of the composite sheet.

9. The display panel according to claim 7, wherein: The side cover includes at least one rounded corner.

10. The display panel according to claim 7, wherein: The light refraction layer includes a plurality of prisms.

11. The display panel according to claim 10, wherein: The plurality of prisms include first prisms having a first height and a first width, and second prisms having a second height and the first width, the second height being different from the first height.

12. The display panel according to claim 7, further comprising: a second light-refractive layer on the second supporting layer, the second light-refractive layer comprising the second material; as well as A third supporting layer is on the second light refractive layer, the third supporting layer comprising the first material.

13. The display panel according to claim 12, wherein: The side cover further includes at least one of a first extension material extending from the first material of the first supporting layer, a fourth extension material extending from the second material of the second light refraction layer, and a fifth extension material extending from the first material of the third supporting layer.

14. The display panel according to claim 12, wherein: The light refraction layer includes a first plurality of prisms extending along a first direction, and the second light refraction layer includes a second plurality of prisms extending along the first direction.

15. The display panel according to claim 12, wherein: The light refraction layer includes a first plurality of prisms extending along a first direction, and the second light refraction layer includes a second plurality of prisms extending along a second direction different from the first direction.

16. The display panel according to claim 15, wherein: The first direction and the second direction form an angle between 0 degrees and 90 degrees.

17. The display panel according to claim 7, wherein: The composite sheet has an inverted tapered shape.

18. The display panel according to claim 7, wherein: The housing includes at least one of a cover bottom, a guide panel, and a housing top, wherein a lower surface of the composite sheet does not contact the housing.

19. A composite sheet comprising: a first support layer comprising a first material; a light-refractive layer on the first support layer, the light-refractive layer comprising a plurality of light-refractive elements of a second material, the second material being different from the first material; a second supporting layer on the light refractive layer, the second supporting layer comprising the first material; as well as a side cover disposed at a certain angle on the first supporting layer, the light refraction layer, and the second supporting layer, the side cover covering an opening at an edge of the light refraction layer due to the shape of the plurality of light refraction elements, Wherein, the composite sheet includes a planar portion and an inclined portion, wherein the side cover comprises a third extended material extending from the first material of the second supporting layer, and The third extension material passes through a virtual line extending from the light refraction layer to the inclined portion and a virtual line extending from the first supporting layer to the inclined portion.

20. The composite sheet according to claim 19, wherein The side cover further includes at least one of a first extending material extending from the first material of the first supporting layer and a second extending material extending from the second material of the light refraction layer.

21. The composite sheet according to claim 19, wherein The plurality of light refracting elements includes a plurality of prisms.

22. The composite sheet according to claim 21, wherein The plurality of prisms include first prisms having a first height and a first width, and second prisms having a second height and the first width, the second height being different from the first height.

23. The composite sheet according to claim 19, wherein The angle of the side cover is greater than 0 degrees and less than 90 degrees.

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