Display panel comprising a composite sheet

Abstract

The present disclosure relates to a display panel including a composite optical sheet that can replace an existing optical sheet and diffusion plate. According to one embodiment of the present disclosure, the display panel includes a display panel layer, a composite sheet layer directly attached to a bottom of the display panel layer, and a housing configured to form an appearance of the display panel layer and the composite sheet layer, wherein the composite sheet layer includes an adhesive layer including a plurality of beads, and a light diffusion layer disposed under the adhesive layer.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0189573, filed on December 28, 2021, the entire contents of which are incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to display panels, and more particularly to display panels including composite panels. Background Technology

[0004] Liquid crystal displays (LCDs) are among the most widely used display devices today. Typically, an LCD device consists of a liquid crystal display panel, which includes a light source and a liquid crystal layer.

[0005] In order to evenly disperse the light traveling from the light source to the liquid crystal display panel across the entire liquid crystal display panel, an optical sheet consisting of multiple thick layers and a diffuser plate with a relatively large thickness is used.

[0006] Such existing optical sheets and diffusers increase the thickness and weight of the liquid crystal display panel. Furthermore, the existing optical sheets and diffusers rub against the housing that forms the exterior of the display panel, resulting in a decrease in image quality. Summary of the Invention

[0007] This disclosure aims to address at least one of the aforementioned problems. One embodiment of this disclosure aims to provide a display panel including a composite optical sheet that can replace existing optical sheets and diffuser plates.

[0008] One embodiment is a display panel comprising: a display panel layer; a composite sheet layer directly attached to the bottom of the display panel layer; and a housing configured to form the appearance of the display panel layer and the composite sheet layer. The composite sheet layer includes: an adhesive layer comprising a plurality of beads; and a light diffusion layer disposed beneath the adhesive layer.

[0009] According to one embodiment, the shell includes at least one of a bottom cover, a guide panel, and a top cover. The bottom surface of the composite sheet does not contact the shell.

[0010] According to one embodiment, the adhesive layer includes: a first layer comprising an adhesive material; a plurality of beads disposed in a single layer on the first layer; and a second layer configured to be disposed on the plurality of beads and the first layer and comprising the adhesive material.

[0011] According to one embodiment, each of the plurality of beads includes: a core layer; and an outer layer surrounding the core layer.

[0012] According to one embodiment, the refractive index of the core layer is greater than that of the outer layer.

[0013] According to one embodiment, the refractive index of the outer layer is greater than that of the adhesive material.

[0014] According to one embodiment, the plurality of beads have different sizes with an error range equal to or less than three times the average size of the beads.

[0015] According to one embodiment, air bubbles are provided in the second layer.

[0016] According to one embodiment, bubbles are formed between adjacent beads.

[0017] According to one embodiment, the size of the bubble is smaller than the size of the multiple beads.

[0018] According to one embodiment, the size of the bubble is less than three times the size of the plurality of beads.

[0019] According to one embodiment, based on a virtual line (VL) passing through the center of multiple beads, the thickness of the first layer is greater than the thickness of the second layer.

[0020] According to one embodiment, the light diffusion layer includes: two support layers facing each other; and a plurality of prisms formed between the support layers.

[0021] According to one embodiment, the plurality of prisms includes: a first prism having a first height and a first width; and a second prism having a second height and a first width different from the first height.

[0022] According to one embodiment, the plurality of prisms includes particles within the plurality of prisms.

[0023] According to one embodiment, the display panel further includes: a plurality of beads disposed in a single layer on a second layer; and a third layer disposed on the plurality of beads and the second layer and comprising an adhesive material.

[0024] According to one embodiment, an additional light diffusion layer is disposed below the light diffusion layer. The additional light diffusion layer includes: two additional support layers facing each other; and a plurality of prisms formed between the two additional support layers.

[0025] According to one embodiment, the adhesive layer includes: a first layer comprising an adhesive material; a plurality of beads disposed in a single layer on the first layer; and a second layer configured to be disposed on the plurality of beads and the first layer and comprising the adhesive material. The light diffusion layer includes: two support layers facing each other; and a plurality of prisms formed between the support layers. The display panel includes: a light recovery layer disposed between the adhesive layer and the light diffusion layer; and a photosensitive layer disposed beneath the adhesive layer.

[0026] In another embodiment, the display panel includes a display panel layer; a light diffusion layer directly attached to the display panel layer using an adhesive layer disposed between the display panel layer and a light diffusion layer; and a plurality of light sources that irradiate light onto the display panel layer through the light diffusion layer. The adhesive layer may include a plurality of beads configured to refract light from the plurality of light sources.

[0027] According to embodiments of this disclosure, the optical layer and diffuser plate disposed beneath the panel layer of a conventional display panel can be removed.

[0028] According to embodiments of this disclosure, the thickness of the display panel can be reduced by removing thick optical layers and diffuser plates and by providing thin composite sheets.

[0029] According to embodiments of this disclosure, since the composite film layer is directly attached to the bottom of the panel layer, image quality degradation due to shrinkage and expansion occurring in high or low temperature environments can be prevented.

[0030] According to embodiments of this disclosure, since the composite sheet does not contact the bottom cover, guide panel, or top of the housing, friction caused by shrinkage and expansion occurring in high or low temperature environments can be prevented.

[0031] According to embodiments of this disclosure, light is diffused by beads having a core layer and an outer layer, so that light propagating to the display panel can be widely diffused. Attached Figure Description

[0032] Figure 1 This is an exploded perspective view showing a display panel according to an embodiment of the present disclosure;

[0033] Figure 2 It is along Figure 1 A cross-sectional view taken from line II;

[0034] Figure 3 This is a perspective view showing a composite sheet according to an embodiment of the present disclosure;

[0035] Figure 4 This is a cross-sectional view showing an adhesive layer according to an embodiment of the present disclosure;

[0036] Figure 5 This is a cross-sectional view showing an adhesive layer according to an embodiment of the present disclosure;

[0037] Figure 6 This is a cross-sectional view showing the light diffusion layer according to an embodiment of the present disclosure;

[0038] Figure 7 This is a cross-sectional view showing the light diffusion layer according to an embodiment of the present disclosure;

[0039] Figure 8 This is a diagram illustrating a composite sheet according to another embodiment of the present disclosure;

[0040] Figure 9 This is a diagram illustrating a composite sheet according to yet another embodiment of the present disclosure; and

[0041] Figure 10 This is a diagram illustrating a composite sheet according to yet another embodiment of the present disclosure. Detailed Implementation

[0042] In the following description, embodiments of the present disclosure will be described with reference to the accompanying drawings. In this specification, when a component (or area, layer, part, etc.) is referred to as being "on top of another component," "connected to another component," or "combined with another component," the terms "on top of," "connected to," or "combined with" mean that the component can be directly connected to / combined with other components, or that a third component can be disposed between them.

[0043] The same reference numerals correspond to the same parts. Furthermore, in the drawings, the thickness, proportions, and dimensions of parts are exaggerated for effective description of technical details. The term "and / or" includes all combinations of one or more that can define the relevant construction.

[0044] While terms such as first and second may be used to describe various components, the components are not limited to the terms mentioned above. Terms are used only to distinguish one component from others. For example, without departing from the scope of the claims of the various embodiments, a first component may be designated as a second component, and similarly, a second component may be designated as a first component. Unless otherwise expressly stated in the context, the singular form includes its plural form.

[0045] Terms such as “below,” “under,” “above,” and “over” are used to describe the relationships between the components shown in the accompanying drawings. These terms are relative and are described based on the directions indicated in the drawings.

[0046] In this specification, it should be understood that the terms "include" or "comprise" are intended to specify the features, numbers, steps, operations, components, parts or any combination thereof described in the specification, and are not intended to preclude the possibility of the presence or addition of at least one other feature, number, step, operation, component, part or any combination thereof.

[0047] Furthermore, for ease of description, exemplary liquid crystal display panels will be described in this specification. However, the ideas of this disclosure are not limited to liquid crystal display panels, and the spirit of this disclosure can be applied in the same manner to other types of display panels, such as organic light-emitting display panels, micro LED display panels, etc.

[0048] Furthermore, for ease of description, a direct-light liquid crystal display panel will be described as an example. However, the ideas of this disclosure can be applied in the same way to other types, such as edge-light liquid crystal display panels.

[0049] Figure 1 This is an exploded perspective view showing a display panel according to an embodiment of the present disclosure.

[0050] Figure 2 It is along Figure 1 The cross-sectional view taken from line II.

[0051] Reference Figure 1 and Figure 2 A display panel is described according to an embodiment of this disclosure.

[0052] The display panel according to embodiments of the present disclosure may include a panel layer 100, a composite layer 200, a backlight driver 300, and a housing 400.

[0053] The panel layer 100 includes: a lower substrate 130 on which switching elements are disposed; an upper substrate 120 disposed on the lower substrate 130; an upper polarizing film 110 disposed on the upper substrate 120; and a lower polarizing film 140 disposed below 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 gate lines and data lines. A pixel may include a thin-film transistor, a common electrode, and a pixel electrode. The thin-film transistor may perform a switching operation 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 may be connected to the thin-film transistor. The upper substrate 120 may include a color filter and a black matrix. Red (R), green (G), and blue (B) 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. Column spacers for maintaining cell gaps may be disposed between the upper substrate 120 and the lower substrate 130.

[0054] The upper polarizing film 110 can be attached to the upper substrate 120, and the lower polarizing film 140 can be disposed below the lower substrate 130. The upper polarizing film 110 and the lower polarizing film 140 can have different polarization functions through stretching processes in opposite directions, and can have contraction forces in opposite directions depending on the stretching. Due to the opposite contraction forces, the panel layer 100 can be formed into a flat state without bending upward or downward.

[0055] The composite layer 200 can be configured to be directly attached to the bottom of the panel layer 100. The composite layer 200 may include an adhesive layer 210 attached to the bottom of the panel layer 100, and a light diffusion layer 220 disposed below the adhesive layer 210.

[0056] Specifically, the adhesive layer 210 can be directly attached to the panel layer 100. Direct attachment means that the adhesive layer 210 and the panel layer 100 are in contact with each other without being spaced apart. Conventional display panels generally include an optical layer and a diffuser plate beneath the panel layer 100. Furthermore, in conventional display panels, the panel layer is spaced apart from the underlying optical layer by a predetermined distance. This is intended to provide a light path that allows light passing through the diffuser plate and the optical layer and propagating to the panel layer to be sufficiently diffused. Unlike conventional display panels, because light passing through the composite layer 200 according to the embodiments herein is sufficiently diffused due to the specific structure of the display panel proposed in this disclosure, the composite layer 200 can be directly attached without being spaced apart from the panel layer 100. (Referring later...) Figures 3 to 10 The principle of light diffusion of the composite layer 200 according to embodiments of the present disclosure is described.

[0057] Furthermore, conventional display panels include optical layers with a thickness of approximately 270 μm, and since at least three optical layers are typically used, the total thickness of the optical layers is approximately 810 μm or more. Additionally, the diffuser plate disposed below the optical layers in conventional display panels has a thickness of approximately 1.5 cm. In contrast, the display panel proposed in this disclosure includes a composite layer 200 without optical layers and a diffuser plate. The composite layer 200 has a thickness of only approximately 400 μm. Therefore, the composite layer 200 according to the embodiments of this disclosure can be easily attached to the bottom of the panel layer 100. Furthermore, the composite layer 200 according to the embodiments of this disclosure can reduce the total thickness of the display panel.

[0058] Furthermore, because the optical layers and diffuser plates included in conventional display panels are thick and heavy, the housing that forms the appearance of the display panel must support the diffuser plate in the vertical direction. For example, the guide panel generally has a structure with protrusions or horizontal portions in the horizontal direction, and the diffuser plate is supported by protrusions or horizontal portions in the vertical direction. When a conventional display panel is exposed to high or low temperature environments, the display panel, optical layers, and diffuser plate will shrink or expand. In this case, since the degree of shrinkage or expansion of the display panel is different from that of the optical layers or diffuser plate, there is a problem of brightness degradation. In addition, friction caused by shrinkage and expansion at the contact points between the diffuser plate and the housing can damage the diffuser plate, which is supported by the housing.

[0059] In contrast, the composite layer 200 according to embodiments of this disclosure can be directly attached to the bottom of the panel layer 100. Therefore, even when the display panel is exposed to high or low temperature environments, the degree of contraction or expansion of the panel layer 100 is somewhat consistent with the degree of contraction or expansion of the composite layer 200, thus preventing brightness degradation. Furthermore, the composite layer 200 according to embodiments of this disclosure may not be supported by the housing 400. For example, as described later, the housing 400 includes at least one of a housing cover 410, a guide panel 420, and a cover bottom 430, and the composite layer 200 is configured not to contact the housing 400. Therefore, no friction occurs between the composite layer 200 and the housing 400 when the composite layer 200 contracts or expands.

[0060] The backlight driver 300 may include a lens 310, a light source module 320, and a backlight circuit 330.

[0061] Each of the light source modules 320 is disposed on the top surface of the backlight circuit 330 in such a way that the light source modules are parallel to each other and spaced apart from each other. The light source modules 320 illuminate the bottom surface of the panel layer 100. The light source modules 320 can emit light simultaneously or individually according to a light source drive signal output from the backlight driver 300. For example, the light source modules 320 can use local dimming to partially control the brightness. According to an embodiment, the light source modules 320 may include a chip-scale package and be directly mounted on the top surface of the backlight circuit 330.

[0062] Lens 310 can be disposed on light source module 320 and can diffuse light incident from light source module 320. Lens 310 can be formed with an aspherical surface and can have optical axis asymmetry. Because lens 310 has an aspherical surface, aberrations can be prevented. For example, the top surface of lens 310 has an elliptical shape and the center of the bottom surface of lens 310 has a conical shape, which prevents hot spots and diffused light.

[0063] The housing 400 may include a housing top 410, a guide panel 420, and a bottom cover 430. The bottom cover 430 may define the lower outer appearance of the display panel. A backlight circuit 330 may be received on the top of the bottom cover 430. The guide panel 420 may be coupled to a side surface of the bottom cover 430. The housing top 410 may define the side outer appearance of the display panel. The housing top 410 may be coupled to a side surface of the guide panel 420. The housing top 410 may cover a portion of the top of the panel layer 100. Therefore, an adhesive element 150 may be inserted between the housing top 410 and the panel layer 100.

[0064] As described above, the housing 400 according to the embodiments of this disclosure does not contact the composite layer 200. That is, the housing 400 may not have a structure for supporting the composite layer 200. For example, the guide panel in a conventional display panel, which has a horizontal portion or protrusion to support the panel layer, may be omitted. As another example, the guide panel 420 according to the embodiments of this disclosure may not include a horizontal portion or protrusion for supporting the panel layer 100.

[0065] Figure 3 This is a perspective view showing a composite sheet according to an embodiment of the present disclosure.

[0066] Figure 4 This is a cross-sectional view showing the adhesive layer according to this disclosure.

[0067] Figure 5 This is a cross-sectional view showing the adhesive layer according to this disclosure.

[0068] Reference Figures 3 to 5 The composite sheet and adhesive layer according to embodiments of the present disclosure are described.

[0069] The composite sheet layer 200 may include an adhesive layer 210. The adhesive layer 210 may include: a first layer L1 comprising an adhesive material; a plurality of beads 211 disposed in a single layer on the first layer L1; and a second layer L2 disposed on the first layer L1 and the beads 211 and comprising the adhesive material. That is, the adhesive layer 210 may include a first layer L1 and a second layer L2, and may include a plurality of beads 211 disposed in a single layer at the boundary between the first layer L1 and the second layer L2.

[0070] Here, the first layer L1 and the second layer L2 can be physically separated or may not be independent layers. That is, since both the first layer L1 and the second layer L2 include adhesive material, the adhesive layer 210 can be implemented as a single layer comprising a plurality of beads 211.

[0071] For example, the adhesive material of the adhesive layer 210 may be a pressure-sensitive adhesive (PSA) or a transparent material that allows light emitted from the light source module 320 to pass through.

[0072] As an example, a method for forming adhesive layer 210 will be described below. A first layer L1 may be formed from an adhesive material. A plurality of beads 211 may be disposed on the formed first layer L1. A second layer L2, covering the first layer L1 and the beads, can be formed by rolling and moving a roller having adhesive material wound around it to form a second layer L2 on the first layer L1.

[0073] The adhesive layer 210 formed in this manner includes a plurality of beads 211 therein, and the plurality of beads 211 can be formed in a single layer. When the optical sheet included in a conventional display panel includes beads, the beads are not formed in a single layer and are arranged to overlap or contact each other, which damages the shape of the beads. Conventional display panels have advantages in terms of light diffusion. However, conventional display panels have the difficulty of diffusing light to the edges of the panel layer. This reduces the overall brightness of the display panel. In contrast, according to the embodiments of the present disclosure, the plurality of beads 211 are formed in a single layer within the adhesive layer 210, so that light can be diffused to the edges of the panel layer 100.

[0074] Reference Figure 4 Assuming the virtual line VL passes through the center of multiple beads 211, the distance D1 from the virtual line VL to the outer surface of the first layer L1 and the distance D2 from the virtual line VL to the outer surface of the second layer L2 can be the same or different from each other. That is, the thickness D1 of the first layer L1 can be the same as or different from the thickness D2 of the second layer L2. For example, if the thickness D1 of the first layer L1 and the thickness D2 of the second layer L2 are the same, it can be seen that multiple beads 211 are formed in the center of the adhesive layer 210.

[0075] Preferably, based on the virtual line VL, the thickness D1 of the first layer L1 can be greater than the thickness D2 of the second layer L2. That is, multiple beads 211 can be formed on the top surface closer to the adhesive layer 210, in which case it is possible to obtain a sufficient light path for light propagating from the bottom. This may be more advantageous for diffusing light in the horizontal direction.

[0076] Multiple beads 211 may have a spherical shape. Furthermore, the multiple beads 211 may include a core layer 2111 and an outer layer 2112 surrounding the core layer 2111. That is, the beads 211 according to embodiments of the present disclosure may be implemented as a double layer. The core layer 2111 and the outer layer 2112 may include nylon-based resin or polyurethane-based resin and may have a predetermined elasticity. The refractive index of the adhesive material constituting the first layer L1 and the second layer L2 is referred to as n1, the refractive index of the outer layer 2112 is referred to as n2, and the refractive index of the core layer 2111 is referred to as n3. According to embodiments of the present disclosure, the refractive index n3 of the core layer 2111 may be greater than the refractive index n2 of the outer layer 2112. Furthermore, the refractive index n2 of the outer layer 2112 may be greater than the refractive index n1 of the adhesive material. Figure 4 As shown, light propagating from bottom to top is initially refracted in the horizontal direction at the boundary between the adhesive material and the outer layer 2112. Furthermore, the initially refracted light is refracted a second time in the horizontal direction at the boundary between the outer layer 2112 and the core layer 2111. Furthermore, the second refracted light is refracted a third time at the boundary between the core layer 2111 and the outer layer 2112. The third refracted light is refracted a fourth time at the boundary between the outer layer 2112 and the adhesive material. Therefore, due to the double-layer structure and refractive index of the bead 211, light propagating from the bottom can be sufficiently diffused in the horizontal direction.

[0077] Furthermore, the plurality of beads 211 according to the embodiments of this disclosure can have uniform dimensions. If the dimensions of the plurality of beads 211 are not uniform, the error can be within three times the average size of the plurality of beads 211.

[0078] Reference Figure 5 The adhesive layer 210 according to embodiments of the present disclosure may include air bubbles 212. Air bubbles 212 may be disposed in the second layer L2. Furthermore, air bubbles 212 may be formed between adjacent beads 211.

[0079] For example, a method for forming bubbles 212 within the adhesive layer 210 will be described below. As described above, after the first layer L1 is formed by the adhesive material, a plurality of beads 211 can be disposed on the first layer L1. Then, when a roller carrying adhesive material wound to form the second layer L2 rolls and moves on the first layer L1, bubbles 212 may or may not be formed by controlling the rolling pressure or the moving speed. When the roller forms bubbles 212, the size of the bubbles 212 can be controlled. For example, if the rolling pressure is increased while the rolling speed is decreased, bubbles 212 may not be formed or the bubbles 212 may be small. For example, if the rolling pressure is decreased while the moving speed is increased, the size of the bubbles 212 may increase.

[0080] Such a bubble 212 can diffuse light that travels from bottom to top. Since the refractive index of the adhesive material and the refractive index of the bubble (i.e., the refractive index of air) are different from each other, light that travels from the bottom and passes through the bubble can be refracted in the horizontal direction.

[0081] Furthermore, the size of the bubble 212 can be determined in various ways depending on the type or size of the display panel or the environment in which the display panel is located. For example, the size of the bubble 212 can be smaller than the size of the bead 211. Or, for another example, the size of the bubble 212 can be larger than the size of the bead 211. However, the size of the bubble 212 can be less than three times the size of the bead 211.

[0082] Figure 6 This is a cross-sectional view showing the light diffusion layer according to an embodiment of the present disclosure.

[0083] Figure 7 This is a cross-sectional view showing the light diffusion layer according to an embodiment of the present disclosure.

[0084] Reference Figure 3 , Figure 6 as well as Figure 7 The present disclosure describes a composite sheet and a light diffusion layer according to embodiments thereof.

[0085] The light diffusion layer 220 may be disposed below the adhesive layer 210. The light diffusion layer 220 may include two support layers 221 facing each other and a plurality of prisms 222 and 223 formed between the support layers 221.

[0086] The support layer 221 can be formed of a transparent material that allows light to propagate from bottom to top to pass through. The support layer 221 can be used to obtain the rigidity of the light diffusion layer 220. The support layer 221 can be formed of, for example, polyethylene terephthalate (PET).

[0087] The two support layers 221 can be spaced apart from each other at a uniform interval, and a plurality of prisms 222 and 223 can be arranged in the space between the two spaced support layers 221.

[0088] The plurality of prisms may include a first prism 222 having a first height H1 and a second prism 223 having a second height H2. The plurality of prisms 222 and 223 may be spaced apart from each other by a uniform interval P. For example, the height H1 of the first prism 222 may be 60 μm, and the height H2 of the second prism 223 may be 70 μm. The interval P between the plurality of prisms 222 and 223 may be, for example, 35 μm.

[0089] Furthermore, the width W of the first prism 222 can be the same as the width W of the second prism 223. That is, the first prism 222 can have a first width W, and the second prism 223 can also have a first width W. For example, the first width W of multiple prisms 222 and 223 can be 35 μm.

[0090] That is, the first prism 222 can have a first height H1 and a first width W, and the second prism 223 can have a second height H2 and a first width W. Therefore, the tilt angle "a" of the first prism can be different from the tilt angle "b" of the second prism. (Refer to...) Figure 6 Light propagating from bottom to top is refracted horizontally as it passes through the first prism 222 and the second prism 223. Here, because the tilt angles “a” and “b” of the first prism 222 and the second prism 223 are different, the angle of refraction of the light passing through the first prism 222 is different from the angle of refraction of the light passing through the second prism 223.

[0091] Although a prism has been described by way of example in this disclosure, the ideas of this disclosure are not limited thereto, and elements having another type of light-diffusing function can be used instead of a prism. For example, microlenses, lenticular lenses, etc., can be used instead of a prism.

[0092] Reference Figure 7 According to embodiments of this disclosure, multiple prisms 222 and 223 may include particles 224 therein. Particles 224 may be made of a transparent material—for example, titanium oxide (TiO2) or silicon oxide (SiO2). Alternatively, particles 224 may be air. Such particles 224 may be randomly dispersed within prisms 222 and 223. Light propagating from bottom to top is refracted as it passes through particles 224. Because particles 224 are randomly disposed within prisms 222 and 223, refracted light may also be randomly refracted.

[0093] Figure 8 This is a diagram illustrating a composite sheet according to another embodiment of the present disclosure.

[0094] Figure 9 This is a diagram illustrating a composite sheet according to yet another embodiment of the present disclosure.

[0095] Figure 10 This is a diagram illustrating a composite sheet according to yet another embodiment of the present disclosure.

[0096] Reference Figures 8 to 10 Describes a composite sheet according to another embodiment of the present disclosure.

[0097] First, refer to Figure 8The composite layer 200 may include an adhesive layer 210 and a light diffusion layer 220 as a dual light diffusion layer.

[0098] That is, the composite sheet 200 according to the embodiments of this disclosure may include an adhesive layer 210, which includes a first layer L1, a plurality of beads 211, and a second layer L2. Three support layers 221 facing each other may be disposed beneath the adhesive layer 210. A plurality of first prisms 222 and a plurality of second prisms 223 may be disposed between the mutually facing support layers 221. Figure 8 As shown, and referenced Figure 4 The thickness of the first layer L1 can be the same as or different from the thickness of the second layer L2. For example, if the thickness of the first layer L1 and the thickness of the second layer L2 are the same, it can be seen that a plurality of beads 211 are formed at the center of the adhesive layer 210. Preferably, based on the virtual line VL, the thickness of the first layer L1 can be greater than the thickness of the second layer L2. That is, the plurality of beads 211 can be formed closer to the top surface within the adhesive layer 210. This can be more advantageous for diffusing light in the horizontal direction.

[0099] In other words, the composite layer 200 according to the embodiments of the present disclosure may include an additional light diffusion layer 220 below the light diffusion layer 220, and the additional light diffusion layer 220 may include two support layers 221 facing each other and a plurality of prisms 222 and 223 formed between the support layers 221.

[0100] Reference Figure 9 The composite layer 200 may include a double adhesive layer 210 and a double light diffusion layer 220. Specifically, according to embodiments of this disclosure, the double adhesive layer 210 includes: a first layer L1; a plurality of beads 211 disposed in a single layer on the first layer L1; a second layer L2 disposed on the first layer L1 and the plurality of beads 211; a plurality of beads 211 disposed in a single layer on the second layer L2; and a third layer L3 disposed on the second layer L2 and the plurality of beads 211. Figure 9 As shown, and referenced Figure 4 The thickness of the first layer L1 can be the same as or different from the thickness of the second layer L2. For example, based on the virtual line VL1, the thickness of the first layer L1 can be greater than the thickness of the second layer L2. That is, multiple beads 211 can be formed closer to the top surface within the adhesive layer 210. Furthermore, based on the virtual line VL2, the thickness of the second layer L2 can be greater than the thickness of the third layer L3. In other words, multiple beads 211 can be formed closer to the top surface within the adhesive layer 210. This is more advantageous for diffusing light in the horizontal direction.

[0101] Reference Figure 10The composite layer 200 may include a double adhesive layer 210 and a double light diffusion layer 220, a light recovery layer 230 between the adhesive layer 210 and the light diffusion layer 220, and a photosensitive layer 240 below the light diffusion layer 220. Alternatively, a single adhesive layer 210 may be used instead of a double adhesive layer 210, and a single light diffusion layer 220 may be used instead of a double light diffusion layer 220.

[0102] The light recovery layer 230 may include light functional layers (such as a reflective polarizing film layer or a prism layer). For example, the light recovery layer 230 may include a dual brightness enhancement film (DBEF). The light recovery layer 230 can recover light. The light recovery layer 230 can polarize light and recover unpolarized light. For example, the light recovery layer 230 can allow polarized light to pass through and reflect unpolarized light back to the lower backlight unit. The reflected light can be reflected again by a reflector attached to the top surface of the cover 430 and can travel upwards again.

[0103] The photosensitive layer 240 may include an adhesive layer 241 and active beads 242. The active beads 242 may have various sizes. For example, the active beads 242 may be made of a material with a predetermined elasticity and may include nylon-based resin or polyurethane-based resin. The active beads 242 may protrude downward from the composite sheet 200, and thus form an optical roughness. The adhesive layer 241 is formed to surround the active beads 242 and may be formed of a thermosetting resin. The adhesive layer 241 may be used to fix the active beads 242 to the composite sheet 200.

[0104] Those skilled in the art will understand that embodiments may be implemented in other specific forms without departing from the spirit or essential characteristics of the embodiments. Therefore, the above embodiments and advantages are merely exemplary and not to be construed as limiting the scope of this disclosure. The scope of the embodiments is defined by the scope of the following claims rather than by the foregoing description. All modifications, alternatives, and variations derived from the scope and meaning of the claims and their equivalents should be interpreted as being included within the scope of the embodiments.

Claims

1. A display panel, comprising: Display panel layer; A composite sheet layer directly attached to the bottom of the display panel layer; A housing configured to form the appearance of the display panel layer and the composite layer, the housing including a bottom cover disposed below the composite layer, a top cover partially disposed above the display panel layer, and a guide panel disposed between the bottom cover and the top cover. as well as A backlight driver includes a backlight circuit and multiple light source modules. The backlight circuit is disposed on the upper surface of the cover layer below the composite layer, and the multiple light source modules are disposed on the upper surface of the backlight circuit. The composite layer includes: An adhesive layer comprising multiple beads; and A light diffusion layer is disposed beneath the adhesive layer; The adhesive layer and the light diffusion layer overlap with the plurality of light source modules in the plan view of the display panel; and The bottom surface of the composite sheet does not contact the bottom cover of the housing, thus forming a hollow space between the plurality of light source modules and the composite sheet. Light from the plurality of light source modules shines from the plurality of light source modules on the upper surface of the bottom cover towards the bottom surface of the composite sheet through the hollow space.

2. The display panel according to claim 1, in, The backlight driver also includes multiple lenses corresponding to the multiple light source modules.

3. The display panel according to claim 1, in, The adhesive layer comprises: Including the first layer of adhesive material; Multiple beads arranged in a single layer on the first layer; and A second layer is disposed on the plurality of beads and the first layer, and the second layer comprises the adhesive material.

4. The display panel according to claim 3, in, Each of the plurality of beads includes: Core layer; and The outer layer surrounding the core layer.

5. The display panel according to claim 4, wherein, The refractive index of the core layer is greater than that of the outer layer.

6. The display panel according to claim 4, wherein, The refractive index of the outer layer is greater than that of the adhesive material.

7. The display panel according to claim 3, wherein, The plurality of beads have different sizes with an error range equal to or less than three times the average size of the beads.

8. The display panel according to claim 3, wherein, The second layer contains air bubbles.

9. The display panel according to claim 8, wherein, The bubbles are formed between adjacent beads in the plurality of beads.

10. The display panel according to claim 8, wherein, The size of the bubble is smaller than the size of the plurality of beads.

11. The display panel according to claim 8, wherein, The size of the bubble is less than three times the size of the plurality of beads.

12. The display panel according to claim 3, wherein, Based on the virtual line (VL) passing through the center of the plurality of beads, the thickness of the first layer is greater than the thickness of the second layer.

13. The display panel according to claim 1, in, The light diffusion layer includes: Two supporting layers facing each other; and Multiple prisms formed between the support layers.

14. The display panel according to claim 13, in, The plurality of prisms includes: A first prism having a first height and a first width; and A second prism having a second height and a first width, wherein the second height is different from the first height.

15. The display panel according to claim 13, wherein, The plurality of prisms includes particles within the plurality of prisms.

16. The display panel according to claim 3, wherein, The adhesive layer further includes: Multiple beads arranged in a single layer on the second layer; and A third layer is disposed on the plurality of beads and the second layer, and the third layer comprises the adhesive material.

17. The display panel according to claim 13, in, An additional light diffusion layer is disposed below the light diffusion layer. Furthermore, the additional light diffusion layer includes: Two additional support layers facing each other; and Multiple additional prisms formed between the two additional support layers.

18. The display panel according to claim 1, in, The adhesive layer comprises: Including the first layer of adhesive material; Multiple beads arranged in a single layer on the first layer; and A second layer is disposed on the plurality of beads and the first layer, and the second layer comprises the adhesive material. The light diffusion layer includes: Two supporting layers facing each other; and Multiple prisms formed between the support layers, And wherein, the display panel includes: A light recovery layer disposed between the adhesive layer and the light diffusion layer; and A photosensitive layer is disposed beneath the adhesive layer.

19. The display panel according to claim 1, wherein, The plurality of light source modules are configured to irradiate light onto the display panel layer through the light diffusion layer.

20. The display panel according to claim 19, wherein, The multiple beads are configured to refract light from the multiple light source modules.

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