Diffusion plate, backlight module and display device

Abstract

The invention discloses a diffusion plate, a backlight module and a display device, the light emitting surface of the diffusion plate is provided with a microstructure, the microstructure comprises a first reflection grid and a plurality of second reflection grids, and the first reflection grid is arranged on the diffusion plate; the first reflection grid divides the diffusion plate into a plurality of light emitting units; the plurality of second reflecting grids are arranged on the diffusion plate; at least one second reflecting grid is filled in each light emitting unit; and the height of the second reflecting grid is smaller than that of the first reflecting grid. The surface roughness is improved by arranging the protruding microstructures on the light-emitting face of the diffusion plate so as to damage the total reflection condition of the light-emitting face, the second reflection grids are surrounded by the first reflection grids, light rays emitted from the light-emitting face in the lateral direction are reflected and collected in a directional mode, the light-emitting uniformity is improved, and the halo phenomenon is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and particularly to a diffusion plate, a backlight module, and a display device. Background Art

[0002] Currently, in backlight display devices, a backlight source is generally provided through a backlight structure to achieve a display function. With the continuous development of semiconductor display technology, light-emitting diodes (LEDs) are mainly used as backlight sources at present, and the light spot shape of the light-emitting diodes is circular. In the existing Mini LED backlight zoning scheme, one lamp is a light control zone, so when multiple light-emitting diodes are integrated, the illuminated areas of adjacent light-emitting diodes intersect with each other, that is, the circular light spots formed by adjacent light control zones have overlapping areas, resulting in a halo phenomenon of zonal brightness crosstalk. At the same time, the light control zones are arranged corresponding to the rectangular pixel matrix on the liquid crystal panel, and the circular light spots larger than the actual physical light control zones are irradiated within the rectangular pixel matrix, which is likely to generate a halo phenomenon. That is to say, when displaying, the square pixel partitions do not match the circular light spots, which will further cause a halo phenomenon and affect the image quality.

[0003] Currently, there is a technology of reducing the pixel aperture ratio at the halo position through an image quality algorithm, thereby increasing the image sharpness to improve the halo problem. However, this method will sacrifice the image details under low gray-scale signals, resulting in image distortion. In short, the current display devices cannot meet various usage requirements, and the original halo problem affects the uniformity of the backlight, making the display effect poor and affecting the use value of the product.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a diffusion plate, a backlight module, and a display device, aiming to solve the problems that the existing display devices are prone to halo problems, the light output uniformity is insufficient, and the display effect of the product is affected.

[0006] The technical solution of the present invention is as follows: A diffusion plate, wherein a microstructure is provided on the light output surface of the diffusion plate, and the microstructure includes: A first reflection grid, provided on the diffusion plate; the first reflection grid divides the diffusion plate into several light output units; Several second reflection grids, provided on the diffusion plate; Wherein, at least one of the second reflection grids is filled and provided in each light output unit; and the height of the second reflection grid is less than the height of the first reflection grid.

[0007] Optionally, the second reflection grid includes at least two layers of reflection gratings arranged concentrically; wherein, the height of the inner reflection grating is less than the height of the outer reflection grating.

[0008] Optionally, the shape of the reflection grating is a grid shape, and the reflection grating extends to the edge of the light-emitting unit and is connected to the side wall of the first reflection grid.

[0009] Optionally, the first reflection grid includes a plurality of first prisms arranged staggeredly; the reflection grating includes a plurality of second prisms arranged staggeredly; Wherein, along the light-emitting direction of the diffusion plate, the cross-sectional shapes of the first prism and the second prism are both triangular.

[0010] Optionally, the top end of the first prism is provided with a first rounded corner; and / or, the top end of the second prism is provided with a second rounded corner.

[0011] Optionally, the microstructure is formed on the diffusion plate by a roller die or soft film embossing.

[0012] Optionally, the diffusion plate includes a substrate and diffusion particles dispersed in the substrate, and the diameter of the diffusion particles is 0.8 - 1.3 micrometers.

[0013] This application also discloses a backlight module, which includes the diffusion plate as described in any one of the above.

[0014] Optionally, the backlight module includes a lamp board and a light guide plate covering the lamp board, and the light guide plate includes a plurality of reflection bowl cups arranged in an array; the reflection bowl cups are used to adapt to the light-emitting units on the lamp board to guide light to the diffusion plate; Wherein, the reflection bowl cups are arranged opposite to the light-emitting units, and the shape of the reflection bowl cups is the same as the shape of the light-emitting units.

[0015] This application also discloses a display device, which includes the diffusion plate, an optical film sheet, and a liquid crystal panel as described in any one of the above, and the optical film sheet and the liquid crystal panel are sequentially arranged on the light-emitting side of the diffusion plate.

[0016] Compared with the prior art, the embodiments of the present invention have the following advantages: The diffusion plate disclosed in the present invention is used in a backlight display device. The diffusion plate is placed on the light-emitting optical path of a backlight source. Light enters from the light-incident surface of the diffusion plate, is transmitted to the light-emitting surface of the diffusion plate, and is refracted out through the microstructure. The microstructure composed of the first reflection grid and the second reflection grid increases the roughness of the light-emitting surface, reduces total reflection at the light-emitting surface, thereby increasing the light-emitting efficiency. Moreover, the first reflection grid is higher than the second reflection grid, which at least blocks part of the light emitted laterally from the second reflection grid or reflects the laterally emitted light in the light-emitting direction, thereby reducing the lateral diffusion of the light spot, changing the shape of the light spot finally formed by the light beam emitted from the light-emitting unit, reducing the overlapping probability of the light spots on the entire display plane, reducing the halo problem, and improving the image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the diffusion plate in the present invention; Figure 2 It is a partial structural diagram of the diffusion plate in the present invention; Figure 3 It is a side view of a display device provided with a backlight module in the present invention.

[0019] Among them, 10. Diffusion plate; 11. Substrate; 12. Diffusion particles; 20. Microstructure; 21. First reflection grid; 211. First prism; 212. First rounded corner; 22. Light-emitting unit; 23. Second reflection grid; 231. Reflection grating; 2311. Second prism; 2312. Second rounded corner; 30. Lamp board; 40. Light guide plate; 41. Reflective bowl cup; 50. Light-emitting unit; 60. Optical film; 70. Liquid crystal panel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0022] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0023] Although terms such as "first", "second", and "third" may be used herein to describe various components, assemblies, regions, layers, or sections, these components, assemblies, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, assembly, region, layer, or section from another. Thus, the first component, assembly, region, layer, or section described in the examples herein may also be referred to as the second component, assembly, region, layer, or section without departing from the teachings of the examples.

[0024] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is flipped, an element described as "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" depending on the spatial orientation of the device. The device may be positioned in other ways as well, and the spatial relationship terms used herein will be interpreted accordingly.

[0025] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0026] With the continuous development of the semiconductor industry, the structure of display devices has been continuously optimized, and in the prior art, backlight modules have gradually tended to be of high resolution and high integration. The light sources used for emitting light in current backlight modules include, but are not limited to, LED lights, Mini LED lights, Micro LED lights, etc. By integrating a large number of light-emitting diodes on a printed circuit board, light emission over the entire surface is achieved.

[0027] However, the spot shapes formed by existing light sources are all circular. To avoid the formation of dark areas between the light sources in the array, the distance between each light source needs to be reduced to meet the illuminance of the dark areas. In this case, it is inevitable that part of the light rays emitted by adjacent light sources will overlap, resulting in the phenomenon of zonal halos.

[0028] Especially to solve the dark area problem, there are currently technical means of scattering the light beam through a diffusion plate and a diaphragm. The refractive index of the diffusion plate and diaphragm materials is much greater than that of air, and the light rays generate a lateral plane diffusion conduction phenomenon in the diffusion plate and diaphragm, resulting in the spot size coming out of the optical diaphragm being several times larger than the size of a single-zone light source on the lamp board.

[0029] Specifically, when the light rays emitted by the light source enter the diffusion plate and encounter the diffusion particles and the interface of the diffusion plate, optical processes such as direct penetration, refraction, scattering, and total reflection will occur. Among them, the scattering and reflection optical processes conduct the light energy emitted by the light source horizontally and laterally in the diffusion plate, thus playing a role in evenly mixing the light rays. This atomization effect results in a decrease in the light energy coming out of the light-emitting surface and an increase in the light energy at large angles. The spot size formed after conduction through the diffusion plate will be several times larger than the zone size. Moreover, the larger the size of the diffusion particles and the higher the concentration of the diffusion particles, the more obvious the halo phenomenon.

[0030] That is to say, the diffusion plate set in the prior art further magnifies the halo problem.

[0031] At the same time, a liquid crystal panel is also provided on the display device. The pixel partitions on the liquid crystal panel are cut into squares, and each pixel partition cannot completely correspond to the circular spot of the light source, so the halo phenomenon is further generated, affecting the image quality.

[0032] Refer to Figure 1 , in an embodiment of the present invention application, a diffusion plate 10 is disclosed. Among them, a microstructure 20 is provided on the light-emitting surface of the diffusion plate 10. The diffusion plate 10 disclosed in this embodiment is used for a backlight display device. The diffusion plate 10 is placed on the light-emitting optical path of the backlight source. The light rays enter from the light-incident surface of the diffusion plate 10, are transmitted to the light-emitting surface of the diffusion plate 10, and are refracted out through the microstructure 20.

[0033] As Figure 1 and Figure 2 shown, the microstructure 20 includes a first reflection grid 21 and a plurality of second reflection grids 23. The first reflection grid 21 is provided on the diffusion plate 10; the first reflection grid 21 divides a plurality of light-emitting units 22 on the diffusion plate 10; a plurality of the second reflection grids 23 are provided on the diffusion plate 10; at least one of the second reflection grids 23 is filled and provided in each light-emitting unit 22; and the height of the second reflection grid 23 is less than the height of the first reflection grid 21.

[0034] In this embodiment, the microstructure 20 composed of the first reflection grid 21 and the second reflection grid 23 increases the roughness of the light-emitting surface, breaks the total reflection condition at the light-emitting surface, thereby increasing the light extraction efficiency. Moreover, the first reflection grid 21 is higher than the second reflection grid 23. The light rays emitted laterally from the second reflection grid 23 hit the first reflection grid 21, blocking the lateral propagation of the light rays and reducing the overlapping area of the light spots generated by two adjacent light sources. In addition, some light rays are reflected by the first reflection grid 21 and propagate towards the light-emitting direction of the diffusion plate 10, reflecting the laterally emitted light rays to the light-emitting direction, further increasing the light extraction efficiency and being beneficial to improving the picture brightness.

[0035] In this embodiment, the mesh shapes of the first reflection grid 21 and the second reflection grid 23 can be flexibly set according to needs. However, considering the requirements of the light output and light output uniformity of the light-emitting surface, it is preferred to set the mesh shapes as polygons such as triangles, quadrilaterals, pentagons, etc., so as to increase the regularity of the light-emitting array, reduce the dark areas between the light spots, and avoid the overlap between adjacent light spots. In actual operation, the mesh shape is preferably not set as a circle. In addition, from the perspective of the manufacturing process, the production of circular mesh holes is more difficult, which easily leads to a reduction in the yield rate and an increase in the manufacturing cost.

[0036] In summary, the diffusion plate 10 disclosed in this embodiment can reduce the lateral diffusion of the light spots, adjust the light rays emitted from each light-emitting unit 22, change the shape of the light spots finally formed by the light beams emitted from the light-emitting unit 22, thereby reducing the overlapping probability of the light spots on the entire display plane, reducing the halo problem, and improving the image quality.

[0037] It can be seen that compared with the traditional method of adjusting the pixel aperture ratio through algorithms to improve the halo problem, in this embodiment, by adjusting the structure of the diffusion plate 10 to control the light spot shape, the halo problem is fundamentally improved. The technical barrier is low, it is easier to implement, and the processing cost is low. More importantly, only by changing the structure of the diffusion plate 10 without adjusting other structures, the image quality of the display device is better, the brightness is higher, and there is no distortion problem, comprehensively improving the use value of the display device.

[0038] Specifically, as another embodiment of the present application, it is disclosed that the microstructure 20 is formed on the diffusion plate 10 by a roller die or a soft film imprinting. The diffusion plate 10 disclosed in this embodiment is made of a light-transmitting polymeric material such as polystyrene, polycarbonate, or acrylic. It is light in weight and convenient to process, and can be directly pressed during the forming process to complete the manufacture of the microstructure 20. Moreover, whether it is formed by a roller die or a soft film imprinting, the operation method is relatively simple, the processing efficiency is high, and the processing accuracy is high.

[0039] It should be noted that in this embodiment, only the forming method of the microstructure 20 is exemplified, but the protection scope of the present invention is not limited thereto. As long as other types of forming methods can fabricate the disclosed microstructure 20 in this application and are equivalent replacements of the inventive concept, they should also be within the protection scope of this application.

[0040] As Figure 1 and Figure 2 shown, as another embodiment of this application, it is disclosed that the second reflection grid 23 includes at least two layers of reflection gratings 231 arranged concentrically; wherein, the height of the inner reflection grating 231 is less than the height of the outer reflection grating 231.

[0041] In this embodiment, by arranging multiple layers of reflection gratings 231, the surface height of the second reflection grid 23 is made uneven, further increasing the roughness on the light-emitting surface, breaking the total reflection condition, and increasing the light-emitting amount of the diffusion plate 10. Moreover, since the inner reflection grating 231 is lower than the outer reflection grating 231, the light laterally emitted by the inner reflection grating 231 will be blocked or reflected by the outer one, thereby reducing the lateral light diffusion and further increasing the forward light-emitting intensity.

[0042] Overall, the height of the second reflection grid 23 in this embodiment is less than the height of the first reflection grid 21; that is to say, the multiple layers of reflection gratings 231 arranged within one light-emitting unit 22 are nested with each other and are surrounded by the higher first reflection grid 21 on the periphery. Therefore, when the light in the diffusion plate 10 is transmitted to the light-emitting surface, the light vertically emitted from the inner reflection grating 231 is not blocked, and the laterally emitted light is either blocked or reflected by the outer reflection grating 231 or by the first reflection grid 21.

[0043] It can be seen that the microstructure 20 in this embodiment forms a multi-layered nested structure in the shape of a double-square character, thereby forming multiple barriers, reducing the laterally transmitted light in the light-emitting unit 22 and increasing the vertically emitted light, thus adjusting the final spot shape, reducing the interference between adjacent light sources, and further improving the effect of alleviating the halo problem.

[0044] Again, as Figure 2 shown, as another embodiment of this application, it is disclosed that the shape of the reflection grating 231 is in the shape of a cross, and the reflection grating 231 extends to the edge of the light-emitting unit 22 and is connected to the side wall of the first reflection grid 21. In this embodiment, the reflection grating 231 is connected to the first reflection grid 21 to form an integral body, making the entire microstructure 20 into a mesh structure, which is beneficial for forming by one-time molding or embossing, reducing the manufacturing difficulty. In addition, the first reflection grid 21 and the second reflection grid 23 are integrated into one body, further increasing the roughness of the light-emitting surface and reducing the total reflection at the light-emitting surface.

[0045] Specifically, both the reflection grating 231 and the first reflection grid 21 in this embodiment can be set in a grid pattern, thereby forming a number of square "mesh holes" on the light-emitting surface. The structure is regular, which is beneficial to forming a square light spot. When applied to a display device, it can be aligned with the square pixel points, further increasing the display precision, reducing the halo problem, and improving the picture quality.

[0046] For another example Figure 2 As shown, as another embodiment of the present application, it is disclosed that the first reflection grid 21 includes a number of first prisms 211 arranged in an alternating pattern; the reflection grating 231 includes a number of second prisms 2311 arranged in an alternating pattern; along the light-emitting direction of the diffusion plate 10, the cross-sectional shapes of the first prism 211 and the second prism 2311 are both triangular.

[0047] In this embodiment, the first prism 211 and the second prism 2311 disclosed are both strip-shaped, and a plurality of them are cross-arranged along the length direction and the width direction of the diffusion plate 10. The arrangement is regular and easy to form. By setting the first prism 211 and the second prism 2311 as triangular prisms with a triangular cross-sectional shape, that is, forming inclined surfaces on the light-emitting surface of the diffusion plate 10, the light mixing effect at the light-emitting surface of the diffusion plate 10 is increased. The light that would be totally reflected at the light-emitting surface will be adjusted to refract out from the side surfaces of the first prism 211 or the second prism 2311.

[0048] In summary, in this embodiment, by setting the first prism 211 and the second prism 2311 with a triangular cross-sectional shape, the inclined surfaces on the light-emitting surface of the diffusion plate 10 are increased. The entire microstructure 20 is in the shape of multiple protruding peaks, increasing the light mixing on the light-emitting surface of the diffusion plate 10, gathering the light in a directional manner, and increasing the forward light output and the uniformity of light output on the light-emitting surface.

[0049] From another perspective, setting the side surfaces of the first prism 211 and the second prism 2311 as inclined surfaces is more conducive to reflecting light. When the light in the diffusion plate 10 refracts out from the side surfaces of the first prism 211 or the second prism 2311 and hits another first prism 211 or another second prism 2311 horizontally, reflection will occur, and the reflection angle is towards the light-emitting direction. Therefore, in this embodiment, by setting the cross-sectional shapes of the first prism 211 and the second prism 2311 as triangular, the light output of the diffusion plate 10 can also be increased, the picture brightness can be improved, and the display quality can be further enhanced.

[0050] For another example Figure 2As shown in the figure, as another embodiment of the present application, it is disclosed that the top end of the first prism 211 is provided with a first rounded corner 212; alternatively, the top end of the second prism 2311 is provided with a second rounded corner 2312. Of course, in this embodiment, the first rounded corner 212 and the second rounded corner 2312 can also be provided simultaneously. The micro-structure 20 disclosed in this embodiment is formed by molding or embossing, and its size is relatively small. Therefore, in order to facilitate demolding and improve the product yield, the top sharp corners of the first prism 211 and the second prism 2311 are designed with rounded corners.

[0051] Specifically, as another embodiment of the present application, it is disclosed that the diffusion plate 10 includes a substrate 11 and diffusion particles 12 dispersed in the substrate 11, and the diameter of the diffusion particles 12 is 0.8 - 1.3 micrometers (μm). The diffusion particles 12 disclosed in this embodiment scatter the incident light emitted by the light source.

[0052] According to the characteristics of the diffusion particles 12, when the size of the scatterer is equivalent to or greater than the wavelength of the incident light, the diffusion particles 12 undergo Mie scattering (abbreviated as Mie scattering), and the light intensity has obvious directivity, with the forward scattering intensity being greater than that in other directions. However, as the size of the scatterer increases, the directivity of the light intensity weakens.

[0053] Therefore, in this embodiment, corresponding to the emission spectrum of the light-emitting diode, the diameter of the diffusion particles 12 is set to 0.8 - 1.3 μm to reduce the scattered light intensity in the non-incident light direction and further improve the halo problem.

[0054] Specifically, in this embodiment, the diameter of the diffusion particles 12 can be any value between 0.8 - 1.3 μm or within the range between any two values, such as 0.9 μm, 1.0 μm, 1.1 μm, 1.2 μm, 1.25 μm, 1.3 μm, etc.

[0055] As Figure 3 shown, as another embodiment of the present application, a backlight module is disclosed, which includes the diffusion plate 10 as described in any one of the above.

[0056] Specifically, as another embodiment of the present application, the backlight module includes a lamp board 30 and a light guide plate 40 covering the lamp board 30. The light guide plate 40 includes a plurality of reflecting bowl cups 41 arranged in an array; the reflecting bowl cups 41 are used to adapt to the light-emitting units 50 on the lamp board 30 to guide the light to the diffusion plate 10; the reflecting bowl cups 41 are arranged opposite to the light-emitting unit 22, and the shape of the reflecting bowl cups 41 is the same as the shape of the light-emitting unit 22.

[0057] The light guide plate 30 disclosed in this embodiment includes, but is not limited to, any one of an LED light guide plate 30, a Mini LED light guide plate 30, a Micro LED light guide plate 30, and an organic light emitting diode light guide plate 30. A light guide plate 40 is covered on the light guide plate 30 to direct the light emitted by the light guide plate 30 to the diffusion plate 10, achieving the first-stage beam control. In particular, the shape of the reflecting bowl 41 is set to be the same as the shape of the light-emitting unit 22, so that the light beam emitted by each light-emitting unit 50 corresponds to a light-emitting unit 22, and the second-stage beam control is performed within the light-emitting unit 22, and finally it is emitted onto the panel to form regular light spots in polygons such as triangles, quadrilaterals, and pentagons with controllable shapes, thereby reducing the dark areas on the light-emitting surface, improving the halo problem at the same time, and enhancing the image quality.

[0058] As Figure 3 shown, as another embodiment of the present application, a display device is disclosed, which includes the diffusion plate 10, the optical film 60, and the liquid crystal panel 70 as described in any one of the above. The optical film 60 and the liquid crystal panel 70 are sequentially arranged on the light-emitting side of the diffusion plate 10.

[0059] The display device disclosed in this embodiment realizes the imaging effect by arranging the optical film 60 and the liquid crystal panel 70 on the light-emitting surface of the diffusion plate 10. The display device includes, but is not limited to, devices such as ultra-high-definition TVs, LED displays, monitors, laptops, mobile phones, and tablets.

[0060] In summary, the present application discloses a diffusion plate 10, wherein a microstructure 20 is provided on the light-emitting surface of the diffusion plate 10. The microstructure 20 includes a first reflection grid 21 and a plurality of second reflection grids 23. The first reflection grid 21 is arranged on the diffusion plate 10; the first reflection grid 21 divides a plurality of light-emitting units 22 on the diffusion plate 10; a plurality of the second reflection grids 23 are arranged on the diffusion plate 10; at least one of the second reflection grids 23 is filled and arranged in each light-emitting unit 22; and the height of the second reflection grid 23 is less than the height of the first reflection grid 21. The diffusion plate 10 disclosed in this embodiment is used for backlight display devices. The diffusion plate 10 is placed on the light-emitting optical path of the backlight source. Light enters from the light-incident surface of the diffusion plate 10, is transmitted to the light-emitting surface of the diffusion plate 10, and is refracted out through the microstructure 20, thereby reducing the lateral diffusion of the light spots, changing the shape of the light spots finally formed by the light beams emitted from the light-emitting units 22, reducing the overlapping probability of the light spots on the entire display plane, reducing the halo problem, and improving the image quality.

[0061] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0062] It should be noted that the specific structure and working principle of the present invention are introduced by taking the diffusion plate, backlight module and display device as examples. However, the application of the present invention is not limited to the diffusion plate, backlight module and display device, and can also be applied to the production and use of other similar workpieces.

[0063] It should be understood that the present invention is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A diffusion plate, characterized in that, A microstructure is provided on the light-emitting surface of the diffusion plate, and the microstructure includes: A first reflection grid provided on the diffusion plate; the first reflection grid divides the diffusion plate into a plurality of light-emitting units; A plurality of second reflection grids provided on the diffusion plate; Wherein, at least one of the second reflection grids is filled and provided in each of the light-emitting units; and the height of the second reflection grid is less than the height of the first reflection grid.

2. The diffusion plate according to claim 1, wherein The second reflection grid includes at least two layers of concentrically arranged reflection gratings; wherein, the height of the inner reflection grating is less than the height of the outer reflection grating.

3. The diffusion plate according to claim 2, wherein The shape of the reflection grating is a grid shape, and the reflection grating extends to the edge of the light-emitting unit and is connected to the side wall of the first reflection grid.

4. The diffusion plate according to claim 3, wherein The first reflection grid includes a plurality of first prisms arranged in an interleaved manner; the reflection grating includes a plurality of second prisms arranged in an interleaved manner; Wherein, along the light-emitting direction of the diffusion plate, the cross-sectional shapes of the first prism and the second prism are both triangular.

5. The diffusion plate according to claim 4, characterized in that, A first rounded corner is provided at the top of the first prism; and / or a second rounded corner is provided at the top of the second prism.

6. The diffusion plate according to claim 1, wherein The microstructure is formed on the diffusion plate by a roller die or soft film embossing.

7. The diffusion plate according to any one of claims 1 to 6, characterized in that, The diffusion plate includes a substrate and diffusion particles dispersed in the substrate, and the diameter of the diffusion particles is 0.8-1.3 microns.

8. A backlight module, characterized in that, Including the diffusion plate according to any one of claims 1 to 7.

9. The backlight module according to claim 8, wherein, The backlight module includes a lamp board and a light guide plate covering the lamp board, and the light guide plate includes a plurality of reflection bowl cups arranged in an array; the reflection bowl cups are used to adapt to the light-emitting units on the lamp board to guide light to the diffusion plate; Wherein, the reflection bowl cup is arranged opposite to the light-emitting unit, and the shape of the reflection bowl cup is the same as the shape of the light-emitting unit.

10. A display device, characterized in that, Including the diffusion plate, an optical film sheet and a liquid crystal panel according to any one of claims 1 to 7, and the optical film sheet and the liquid crystal panel are sequentially arranged on the light-emitting side of the diffusion plate.

Images