Diffusion plate and display device
Patent Information
- Application Number
- CN202522664277.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-10-13
- Estimated Expiration
- 2035-12-15
AI Technical Summary
OD值的减少时，灯珠混光距离不够，光无法实现完全混合，在主观上会有灯颗影问题，造成显示效果下降；在增加灯珠数量以减少因混光距离减少而导致的灯影问题时，会使得背光成本大幅度提高
[0016]本实用新型的技术方案中，通过设置所述第一扩散面，在所述灯珠发出的光线进入到扩散板内，然后通过所述第一扩散面射出时，光线能够经过所述第一扩散面并向所述灯珠的旁侧折射，能够降低所述远灯面对应所述灯珠区域的亮度，从而改善了灯颗影的问题；通过将所述灯珠射出的光线折射后送向所述灯珠的旁侧区域，提高了混光效果，能够减少灯珠的数量，以降低背光成本。
Smart Images
Figure CN224851398U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display backlight technology, and in particular to a diffuser plate and a display device. Background Technology
[0002] With the development of Mini LED technology, many TV manufacturers are positioning Mini LED TVs as flagship products, and are further designing them in a wallpaper-like form. Wallpaper-style TVs fit seamlessly against the wall; only by reducing the overall thickness of the TV can the advantages of this form factor be fully realized. Reducing the thickness of the TV often involves compressing the thickness of the backlight module, i.e., compressing the module's light mixing distance (OD value). When the OD value is reduced, the light mixing distance between the LEDs is insufficient, and the light cannot be completely mixed, resulting in a subjective issue of LED shadows and a decrease in display quality. Increasing the number of LEDs to reduce the shadow problem caused by the reduced light mixing distance significantly increases the cost of the backlight. Utility Model Content
[0003] The main purpose of this invention is to provide a diffuser plate and a display device, which aims to improve the light mixing effect and reduce the cost of backlighting.
[0004] To achieve the above objectives, the present invention proposes a diffuser plate for use in a backlight module with LED beads, wherein the diffuser plate is formed with opposing near-lamp surface and far-lamp surface. A first diffusion recess is provided on the high-beam surface, which is configured to correspond to the lamp bead. In the direction from the near-beam surface to the high-beam surface, the cross-sectional area of the first diffusion recess gradually increases, so that the first diffusion recess has an inclined first diffusion surface. The light entering the diffuser plate from the lamp bead is at least partially refracted toward the side of the lamp bead at the first diffuser surface, or at least partially totally reflected at the first diffuser surface.
[0005] In one embodiment, the intersection line of the first diffusion surface on the longitudinal section is arranged as a straight line or a curve.
[0006] In one embodiment, the slope of the intersection line of the first diffuser surface on the longitudinal section gradually decreases in the direction from the near lamp surface to the far lamp surface.
[0007] In one embodiment, the first diffusion recess is cone-shaped, and correspondingly, the first diffusion surface is cone-shaped.
[0008] In one embodiment, the first diffusion recess is arranged in a ring shape, and the first diffusion recess includes two annular wall surfaces that are spaced apart from each other. One of the annular wall surfaces is set as the first diffusion surface, and the other annular wall surface is set as the first connecting surface. The first connecting surface and the first diffusion surface cooperate to form a first diffusion group. Multiple first diffusion groups are provided, and multiple first diffusion groups are arranged circumferentially on the high beam surface. In any two adjacent first diffusion groups, the first connecting surface connects to two first diffusion surfaces respectively.
[0009] In one embodiment, a plurality of the first diffusion recesses are arranged on concentric circular curves distributed in the inward and outward directions.
[0010] In one embodiment, in the direction from the near lamp surface to the far lamp surface, the plurality of first diffusion recesses are at the same height; or, In adjacent first diffusion recesses, the first diffusion recess located on the inner side is closer to the near lamp surface than the first diffusion recess located on the outer side.
[0011] In one embodiment, a second diffusion recess is provided on the near lamp surface, the second diffusion recess being configured to correspond to the lamp bead. In the direction from the far lamp surface toward the near lamp surface, the cross-sectional area of the second diffusion recess gradually increases, so that the second diffusion recess has an inclined second diffusion surface. The light emitted from the lamp bead diffuses to the side of the lamp bead at the second diffusion surface and enters the interior of the diffusion plate.
[0012] In one embodiment, the intersection line of the second diffusion surface on the longitudinal section is arranged as a straight line or a curve.
[0013] In one embodiment, the slope of the intersection line of the second diffuser surface on the longitudinal section gradually increases in the direction from the far lamp surface to the near lamp surface.
[0014] In one embodiment, a diffusion layer is provided on the lamp-near surface of the diffusion plate and / or a diffusion portion is provided within the diffusion plate; The diffusion layer contains multiple diffusion particles; The diffusion section includes diffusion particles or diffusion bubbles.
[0015] This utility model also proposes a display device, comprising: A back panel and a light panel, wherein the light panel is disposed on the back panel and LED beads are provided on the light panel; A diffuser plate, the diffuser plate including the diffuser plate, the diffuser plate being disposed on the side of the lamp plate facing away from the back plate; A diaphragm is disposed on one side of the far-light surface of the diffuser plate; A display panel is disposed on the side of the diaphragm away from the diffuser plate; and, A reflective sheet is disposed on the back plate; The diffuser plate is used for a backlight module with LEDs, and the diffuser plate is formed with opposing near-lamp surface and far-lamp surface. A first diffusion recess is provided on the high-beam surface, which is configured to correspond to the lamp bead. In the direction from the near-beam surface to the high-beam surface, the cross-sectional area of the first diffusion recess gradually increases, so that the first diffusion recess has an inclined first diffusion surface. The light entering the diffuser plate from the lamp bead is at least partially refracted toward the side of the lamp bead at the first diffuser surface, or at least partially totally reflected at the first diffuser surface.
[0016] In the technical solution of this utility model, by setting the first diffusion surface, when the light emitted by the lamp bead enters the diffusion plate and then shines out through the first diffusion surface, the light can pass through the first diffusion surface and be refracted to the side of the lamp bead, which can reduce the brightness of the area of the lamp bead corresponding to the far lamp surface, thereby improving the problem of lamp bead shadow; by refracting the light emitted by the lamp bead and sending it to the side area of the lamp bead, the light mixing effect is improved, and the number of lamp beads can be reduced to reduce the backlight cost. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0018] Figure 1 A schematic diagram of the structure of an embodiment of the display device provided by this utility model; Figure 2 A schematic diagram of the structure of an embodiment of the diffuser plate provided by this utility model; Figure 3 A schematic diagram of another embodiment of the diffuser plate provided by this utility model; Figure 4 A schematic diagram of another embodiment of the diffuser plate provided by this utility model; Figure 5 A schematic diagram of another embodiment of the diffuser plate provided by this utility model; Figure 6 for Figure 5A magnified view of a section at point A in the middle; Figure 7 A schematic diagram of another embodiment of the diffuser plate provided by this utility model; Figure 8 for Figure 7 A magnified view of a section at point B in the middle.
[0019] Explanation of icon numbers: 10. Diffuser plate; 1. Near lamp surface; 2. Far lamp surface; 3. First diffuser recess; 31. First diffuser surface; 32. First connecting surface; 4. Second diffuser recess; 41. Second diffuser surface; 5. Diffuser layer; 6. Diffuser section; 100. Display device; 20. Back panel; 30. Lamp bead; 40. Diaphragm; 50. Display panel; 60. Reflector.
[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0024] With the development of Mini LED technology, many TV manufacturers are positioning Mini LED TVs as flagship products, and are further designing them in a wallpaper-like form. Wallpaper-style TVs fit seamlessly against the wall; only by reducing the overall thickness of the TV can the advantages of this form factor be fully realized. Reducing the thickness of the TV often involves compressing the thickness of the backlight module, i.e., compressing the module's light mixing distance (OD value). When the OD value is reduced, the light mixing distance between the LEDs is insufficient, and the light cannot be completely mixed, resulting in a subjective issue of LED shadows and a decrease in display quality. Increasing the number of LEDs to reduce the shadow problem caused by the reduced light mixing distance significantly increases the cost of the backlight.
[0025] This utility model proposes a diffuser plate for use in a backlight module with LED beads.
[0026] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the diffuser plate 10 is used for a backlight module having LED beads 30. The diffuser plate 10 has opposing near-lamp surface 1 and far-lamp surface 2. A first diffuser recess 3 is provided on the far-lamp surface 2, which is disposed corresponding to the LED beads 30. In the direction from the near-lamp surface 1 to the far-lamp surface 2, the cross-sectional area of the first diffuser recess 3 gradually increases, so that the first diffuser recess 3 has an inclined first diffuser surface 31. Light entering the diffuser plate 10 from the LED beads 30 is at least partially refracted to the side of the LED beads 30 at the first diffuser surface 31, or at least partially totally reflected at the first diffuser surface 31.
[0027] In the technical solution of this utility model, by setting the first diffusion surface 31, the light emitted by the lamp bead 30 enters the diffusion plate 10 and then shines out through the first diffusion surface 31. The light can pass through the first diffusion surface 31 and be refracted to the side of the lamp bead 30, which can reduce the brightness of the area corresponding to the lamp bead 30 on the far lamp surface 2 side, thereby improving the problem of lamp shadow; by refracting the light emitted by the lamp bead 30 and sending it to the side area of the lamp bead 30, the light mixing effect is improved, and the number of lamp beads 30 can be reduced to reduce the backlight cost.
[0028] The backlight module is a direct-lit backlight module. The LED 30 is positioned directly opposite the surface of the diffuser plate 10. The near-lamp surface 1 is the side of the diffuser plate 10 that is close to the LED 30, and the far-lamp surface 2 is the side of the diffuser plate 10 that is away from the LED 30, so that the light emitted by the LED 30 enters the diffuser plate 10 from the near-lamp surface 1.
[0029] The diffuser plate 10 can be made of one or more of the following materials: PP (polypropylene), PS (polystyrene), PMMA (polymethyl methacrylate), PC (polycarbonate), and PE (polyethylene). The material of the diffuser plate 10 can also be other than those listed above, and is not limited thereto. The thickness of the diffuser plate 10 ranges from 0.8 mm to 3 mm (inclusive), specifically, the thickness of the diffuser plate 10 is 2.0 mm.
[0030] The first diffusion recess 3 can be integrally formed with the diffusion plate 10, or the first diffusion recess 3 can be formed on the far light surface of the diffusion part 6, which is not limited here.
[0031] The refractive index of the diffuser plate 10 is greater than that of air, and the surface medium of the first diffuser surface 31 is mostly air. In the direction from the near-lamp surface 1 to the far-lamp surface 2, the cross-sectional area of the first diffuser recess 3 gradually increases, causing the tangent plane of the first diffuser surface 31 to tilt outwards towards the lamp bead 30. When light from the diffuser plate 10 strikes the first diffuser surface 31, if the angle between the light ray and the normal to the tangent plane of the first diffuser surface 31 is less than a critical angle, the light ray exits through the first diffuser surface 31, and the exit angle is greater than the incident angle, causing the light ray passing through the first diffuser surface 31 to diffuse towards the periphery of the lamp bead 30. When light from the diffuser plate 10 strikes the first diffuser surface 31, if the angle between the light ray and the normal to the tangent plane of the first diffuser surface 31 is greater than a critical angle, the light ray undergoes total internal reflection at the first diffuser surface 31 and strikes the near-lamp surface 1.
[0032] The intersection line of the first diffusion surface 31 on the longitudinal section is a straight line. This allows light rays with the same incident angle to diffuse at the same exit angle or be reflected back into the diffusion plate 10 at the same reflection angle when passing through the first diffusion surface 31 and at different contact positions.
[0033] Please see Figure 2 , Figure 3 and Figure 4 The intersection line of the first diffusion surface 31 on the longitudinal section is extended in a curve. This allows light rays with the same incident angle to have different incident angles when passing through the first diffusion surface 31 and at different contact positions, resulting in different emission angles for diffusion or reflection. This allows the tilt angle of the intersection line of the first diffusion surface 31 to be set according to the light emission brightness of the corresponding first diffusion surface 31.
[0034] In the direction from the near-lamp surface 1 to the far-lamp surface 2, the slope of the intersection line of the first diffusion surface 31 on the longitudinal section gradually decreases. When light within the diffusion plate 10 passes through the first diffusion surface 31, and the contact point is from the inside to the outside of the lamp bead 30, the angle of light deflection from the first diffusion surface 31 to the outside of the lamp bead 30 gradually decreases, thereby ensuring the brightness of the light in the corresponding area on the outside of the first diffusion surface 31 and improving the uniformity of light emitted from the far-lamp surface 2 of the diffusion surface.
[0035] The first diffusion recess 3 is tapered, and correspondingly, the first diffusion surface 31 is tapered. When light within the diffusion plate 10 passes through the first diffusion surface 31, the light is refracted outward along each radial direction of the first diffusion surface 31, improving the light mixing in the peripheral area of the lamp bead 30.
[0036] Please see Figure 5 and Figure 6 The first diffusion recess 3 is arranged in a ring shape. The first diffusion recess 3 includes two annular wall surfaces that are spaced apart from each other. One of the annular wall surfaces is set as the first diffusion surface 31, and the other annular wall surface is set as the first connecting surface 32. The first connecting surface 32 and the first diffusion surface 31 cooperate to form a first diffusion group. There are multiple first diffusion groups. Multiple first diffusion groups are arranged circumferentially on the high-beam surface 2. In any adjacent first diffusion groups, the first connecting surface 32 connects two first diffusion surfaces 31 respectively.
[0037] When light within the diffuser plate 10 passes through the first diffuser surface 31, the light diffuses outwards from the lamp beads 30. The multiple first diffuser surfaces 31 work together to increase the contact area with the light within the diffuser plate 10, thereby reducing the brightness of the light in the areas directly corresponding to the multiple first diffuser surfaces 31 and preventing lamp bead shadows from appearing in those areas. The first diffuser recess 3 can be circular or polygonal, and is not limited here; specifically, the first diffuser recess 3 is circular. The first connecting ring extends along the thickness direction of the diffuser plate 10. Multiple first diffuser groups work together to form a Fresnel structure.
[0038] Multiple first diffusion recesses 3 are arranged on concentric circular curves distributed in the inward and outward directions. When light within the diffusion plate 10 passes through multiple first diffusion surfaces 31, the multiple first diffusion surfaces 31 can refract the light in the circumferential direction respectively.
[0039] In the direction from the near-lamp surface 1 to the far-lamp surface 2, multiple first diffuser recesses 3 are at the same height. By providing the first connecting surface 32, two first diffuser surfaces 31 can be transitionally connected. In the direction from the inside to the outside, after one first diffuser surface 31 lowers to its lowest point, the starting point of the next adjacent first diffuser surface 31 can be raised through the first connecting surface 32, so that the next first diffuser surface 31 can tilt downwards. Overall, while ensuring the tilt angle of a single first diffuser surface 31, the depth of the first diffuser recesses 3 can be reduced, thus reducing the depth of the recess on the far-lamp side of the diffuser plate 10.
[0040] Please see Figure 7 and Figure 8 In adjacent first diffusion recesses 3, the inner first diffusion recess 3 is closer to the near-lamp surface 1 than the outer first diffusion recess 3. The tilt angle of the first diffusion surface 31 can be increased without changing the difference between the inner and outer diameters of the first diffusion recesses 3; this enhances the refraction and diffusion of light towards the periphery of the lamp bead 30 when light passes through the first diffusion surface 31 within the diffusion plate 10. Specifically, the minimum depth of the inner first diffusion recess 3 is less than the maximum depth of the outer first diffusion recess 3, and the maximum depth of the inner first diffusion recess 3 is greater than the maximum depth of the outer first diffusion recess 3.
[0041] A second diffusion recess 4 is provided on the near-lamp surface 1. The second diffusion recess 4 is provided corresponding to the lamp bead 30. In the direction from the far-lamp surface 2 to the near-lamp surface 1, the cross-sectional area of the second diffusion recess 4 gradually increases, so that the second diffusion recess 4 has an inclined second diffusion surface 41. The light emitted from the lamp bead 30 diffuses to the side of the lamp bead 30 at the second diffusion surface 41 and enters the interior of the diffusion plate 10.
[0042] When the light emitted from the lamp bead 30 passes through the second diffusion surface 41, the light is refracted to the side of the lamp bead 30 to reduce the direct illumination light and reduce the brightness of the area corresponding to the lamp bead 30 on the far lamp surface 2 side.
[0043] The intersection line of the second diffusion surface 41 on the longitudinal section is a straight line. This allows light rays with the same incident angle to diffuse and enter the diffusion plate 10 at the same exit angle when passing through the second diffusion surface 41 and at different contact positions.
[0044] The intersection line of the second diffusion surface 41 on the longitudinal section is extended in a curve. This allows light rays with the same incident angle to have different incident angles when passing through the second diffusion surface 41 and at different contact positions, resulting in different emission angles for diffusion or reflection. This allows the tilt angle of the intersection line of the second diffusion surface 41 to be set according to the light emission angle of the corresponding second diffusion surface 41.
[0045] In the direction from the far lamp surface 2 to the near lamp surface 1, the slope of the intersection line of the second diffusion surface 41 on the longitudinal section gradually increases. This allows light passing through the second diffusion surface 41 to diffuse at different exit angles, thus ensuring the light mixing area of the lamp bead 30.
[0046] The second diffusion recess 4 is conical, and correspondingly, the second diffusion surface 41 is conical. When light within the diffusion plate 10 passes through the second diffusion surface 41, it is refracted outwards along various radial directions of the second diffusion surface 41, improving light mixing in the peripheral area of the lamp bead 30. Specifically, the second diffusion recess 4 is arched, and the maximum opening width of the second diffusion recess 4 is not less than the width of the light-emitting surface of the lamp bead 30. This width can be modified and adjusted according to the light pattern of the lamp bead 30. Specifically, the maximum opening width of the second diffusion recess 4 is 1 mm.
[0047] Please see Figure 2 and Figure 3 A diffusion layer 5 is provided on the near-lamp surface 1 of the diffusion plate 10, and a plurality of diffusion particles are provided in the diffusion layer 5. When the light reflected by the first diffusion surface 31 passes through the first diffusion layer 5, the diffusion layer 5 can destroy the total internal reflection of the light at this point, so that the light enters the cavity and is then emitted by the reflector 60 on the surface of the lamp plate, realizing multiple light mixing in the cavity, thereby achieving the effect of multiple light mixing and uniform light.
[0048] Please see Figure 3 A diffusion section 6 is provided within the diffusion plate 10, and the diffusion section 6 includes diffusion particles. When the optical fiber passes through the diffusion section 6, the light undergoes a diffuse reflection effect, transforming the collimated light into disordered light rays to improve the light mixing effect.
[0049] Please see Figure 4 A diffusion section 6 is provided within the diffusion plate 10, and the diffusion section 6 diffuses air bubbles. The diffusion bubbles have a good light transmission effect, which can reduce the obstruction and loss of light, thereby improving the overall brightness after light mixing.
[0050] The diffusing particles can be silicon dioxide, barium sulfate, or titanium dioxide, etc. The specific particles can be selected as needed, and no limitation is made here.
[0051] When there is only one first diffusion recess 3, the depth of the second diffusion recess 4 is less than or equal to one-third of the thickness of the diffusion plate 10; the depth of the first diffusion recess 3 is less than or equal to one-third of the thickness of the diffusion plate 10. Specifically, the depth of the second diffusion recess 4 is equal to the depth of the first diffusion recess 3, and the depth of the second diffusion recess 4 is equal to one-third of the thickness of the diffusion plate 10.
[0052] The light emitted from the LED bead 30 enters the second diffuser recess 4. As the light passes the second diffuser surface 41, it is deflected to the side and enters the diffuser plate 10, allowing it to enter the diffuser plate 10 at a larger diffusion angle. Some of the light entering the diffuser plate 10 illuminates the diffuser section 6, causing diffuse reflection and forming disordered diffused light. This diffused light then exits from the side of the first diffuser recess 3, uniformly illuminating the far-light surface 2 of the diffuser plate 10, resulting in a larger illuminated area and more uniform brightness. Another portion of the light can illuminate the first diffuser recess 3. Light with an incident angle less than the critical angle passes through the first diffuser surface 31 and exits outside the diffuser plate 10. Light with an incident angle greater than the critical angle undergoes total internal reflection at the first diffuser surface 31 and is reflected towards the near-lamp surface 1 of the diffuser plate 10. The light then passes through the near-lamp surface 1 of the diffuser plate 10 and strikes the reflector 60. After reflection by the reflector 60, the light passes through the near-lamp surface 1 of the diffuser plate 10 and exits from the side of the first diffuser recess 3. The diffused light can uniformly illuminate the far-lamp surface 2 of the diffuser plate 10, resulting in a larger illuminated area and more uniform brightness on the diffuser plate 10. Overall, without changing the distance between the LEDs 30 and the diffuser plate 10, the light mixing effect is improved. The number of LEDs 30 can be reduced, thereby lowering the backlight cost.
[0053] Please see Figure 1 This utility model also proposes a display device 100, which includes a diffuser plate 10. The specific structure of the diffuser plate 10 is as described in the above embodiments. Since this display device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The display device 100 includes a back plate 20, a lamp plate, a diffuser plate 10, a diaphragm 40, a display panel 50, and a reflector 60. The lamp plate is disposed on the back plate 20, and lamp beads 30 are disposed on the lamp plate. The diffuser plate 10 is disposed on the side of the lamp plate facing away from the back plate 20. The diaphragm 40 is disposed on the side of the diffuser plate 10 away from the lamp surface 2. The display panel is disposed on the side of the diaphragm 40 away from the diffuser plate 10. The reflector 60 is disposed on the back plate 20.
[0054] When light from the near-lamp surface 1 enters the cavity between the diffuser plate 10 and the reflector 60, the light is reflected by the reflector 60 and then enters the diffuser plate from the near-lamp surface 1, achieving multiple light mixing. Multiple lamp beads 30, the first diffuser recess 3, and the second diffuser recess 4 are provided in a one-to-one correspondence. The display device 100 can be a television or any display screen with display effects; no limitation is made here.
[0055] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A diffuser plate for use in a backlight module with LED chips, characterized in that, The diffuser plate has opposing near-lamp and far-lamp surfaces; A first diffusion recess is provided on the high-beam surface, which is configured to correspond to the lamp bead. In the direction from the near-beam surface to the high-beam surface, the cross-sectional area of the first diffusion recess gradually increases, so that the first diffusion recess has an inclined first diffusion surface. The light entering the diffuser plate from the lamp bead is at least partially refracted toward the side of the lamp bead at the first diffuser surface, or at least partially totally reflected at the first diffuser surface.
2. The diffuser plate as described in claim 1, characterized in that, The intersection line of the first diffusion surface on the longitudinal section is set to extend in a straight line or a curve.
3. The diffusion plate as described in claim 2, characterized in that, In the direction from the near lamp surface to the far lamp surface, the slope of the intersection line of the first diffusion surface on the longitudinal section gradually decreases.
4. The diffuser plate as described in claim 2, characterized in that, The first diffusion recess is cone-shaped, and correspondingly, the first diffusion surface is cone-shaped.
5. The diffuser plate as described in claim 2, characterized in that, The first diffusion recess is arranged in a ring shape. The first diffusion recess includes two annular wall surfaces that are spaced apart from each other. One of the annular wall surfaces is set as the first diffusion surface, and the other annular wall surface is set as the first connecting surface. The first connecting surface and the first diffusion surface cooperate to form a first diffusion group. Multiple first diffusion groups are provided, and multiple first diffusion groups are arranged circumferentially on the high beam surface. In any two adjacent first diffusion groups, the first connecting surface connects to two first diffusion surfaces respectively.
6. The diffuser plate as described in claim 5, characterized in that, Multiple first diffusion recesses are arranged on concentric circular curves distributed in the inward and outward directions.
7. The diffuser plate as described in claim 6, characterized in that, In the direction from the near-lamp surface to the far-lamp surface, the plurality of the first diffusion recesses are at the same height; or, In adjacent first diffusion recesses, the first diffusion recess located on the inner side is closer to the near lamp surface than the first diffusion recess located on the outer side.
8. The diffusion plate as described in claim 1, characterized in that, A second diffusion recess is provided on the near lamp surface, which is configured to correspond to the lamp bead. In the direction from the far lamp surface to the near lamp surface, the cross-sectional area of the second diffusion recess gradually increases, so that the second diffusion recess has an inclined second diffusion surface. The light emitted from the lamp bead diffuses to the side of the lamp bead at the second diffusion surface and enters the interior of the diffusion plate.
9. The diffuser plate as described in claim 8, characterized in that, The intersection line of the second diffusion surface on the longitudinal section is set as a straight line or a curve.
10. The diffusion plate as claimed in claim 9, characterized in that, In the direction from the far lamp surface to the near lamp surface, the slope of the intersection line of the second diffuser surface on the longitudinal section gradually increases.
11. The diffuser plate as claimed in claim 1, characterized in that, A diffusion layer is provided on the lamp-near surface of the diffusion plate and / or a diffusion section is provided within the diffusion plate; The diffusion layer contains multiple diffusion particles; The diffusion section includes diffusion particles or diffusion bubbles.
12. A display device, characterized in that, include: A back panel and a light panel, wherein the light panel is disposed on the back panel and LED beads are provided on the light panel; A diffuser plate, comprising the diffuser plate as described in any one of claims 1 to 11, wherein the diffuser plate is disposed on the side of the lamp plate facing away from the back plate; A diaphragm is disposed on one side of the far-light surface of the diffuser plate; A display panel is disposed on the side of the diaphragm away from the diffuser plate; and, A reflective sheet is disposed on the back plate.