Light diffusing plate and lighting device

Abstract

The present application relates to a kind of light diffusion plate and lighting device.Light diffusion plate includes: diffusion plate body, several diffusion particles are in diffusion plate body, diffusion plate body includes light inlet face and light outlet face;First microstructure layer, located the light inlet face side of diffusion plate body, first microstructure layer includes several microstructures, microstructure includes located on the prism and located on the pyramid of light inlet face;The upper bottom surface of prism coincides with the bottom surface of pyramid, the side of prism is alternately arranged by triangle and quadrilateral, the vertex of triangle away from the vertex of the bottom surface of pyramid coincides, the other two vertexes of triangle are located on the lower bottom surface of prism;And second microstructure layer, located the light outlet face side of diffusion plate body, the side of second microstructure layer away from diffusion plate body has rough grain.The light diffusion plate of the present application improves the utilization rate of light source, can make emitted light uniform soft, make light uniform propagation while playing the effect of anti-glare, more conducive to application.

Description

Technical Field

[0001] This invention relates to the field of diffuser plate technology, and in particular to a light diffuser plate and a lighting device. Background Technology

[0002] Currently, with the gradual development of society, more and more lighting devices such as billboards, displays, and lamps are experiencing uneven light emission due to the concentration of point or line light sources. Diffusers are typically used to solve this problem because of their high light diffusion, high transmittance, and good light-blocking properties. Their principle is based on the fact that when light encounters two media with different refractive indices (densities) during its journey, it undergoes refraction, reflection, and scattering.

[0003] However, existing diffusers cannot effectively solve the glare problem during use, especially in enclosed spaces such as offices, libraries, hospitals, and schools, where they can cause eye discomfort. As living standards improve, people increasingly seek more comfortable and user-friendly living environments. The lighting industry is also shifting its focus from brightness to lighting comfort, creating a pressing market demand for glare-resistant diffusers.

[0004] To address the aforementioned issues, traditional light diffusers are made from a transparent matrix resin and diffusing particles added to the matrix resin via a blending process. However, while traditional light diffusers achieve anti-glare by refracting light multiple times along its propagation path, they offer little benefit to the uniform propagation of light, falling far short of the desired effect and thus hindering practical applications. Summary of the Invention

[0005] Therefore, it is necessary to provide a light diffusion plate and lighting device to address the issue of how to achieve anti-glare effect while ensuring uniform light propagation.

[0006] A light diffusion plate, the light diffusion plate comprising:

[0007] A diffuser plate body, wherein the diffuser plate body contains a plurality of diffuser particles, and the diffuser plate body includes a light-incoming surface and a light-outgoing surface;

[0008] A first microstructure layer, located on the light-incoming surface side of the diffuser plate body, comprises several microstructures, including a frustum on the light-incoming surface and a pyramid on the frustum; the upper base of the frustum coincides with the base of the pyramid, the sides of the frustum are arranged alternately with triangles and quadrilaterals, the vertex of the triangle furthest from the diffuser plate body coincides with the vertex of the base of the pyramid, and the other two vertices of the triangle are located on the lower base of the frustum; and

[0009] The second microstructure layer is located on the light-emitting side of the diffuser plate body, and the side of the second microstructure layer away from the diffuser plate body has a rough texture.

[0010] Compared to traditional light diffusers, the light diffuser of this invention comprises a first microstructure layer, a second microstructure layer, and a diffuser body located between the first and second microstructure layers. When light enters through the first microstructure layer, it is initially dispersed. The diffuser body further disperses the light, making it more uniform, and finally, it exits through the second microstructure layer, thus completing the light diffusion process. This improves the utilization rate of the light source, produces uniform and soft emitted light, and provides anti-glare while ensuring uniform light propagation, making it more suitable for various applications.

[0011] In one embodiment, the quadrilateral is a trapezoid, and the lower base of the trapezoid coincides with the edge of the base of the pyramid.

[0012] In one embodiment, the side surface of the pyramid is not coplanar with the side surface of the frustum.

[0013] In one embodiment, the pyramid is a square pyramid, a pentagonal pyramid, a hexagonal pyramid, or a heptagonal pyramid;

[0014] The base side length of the pyramid is 0.5mm to 2mm, and the height of the pyramid is 0.1mm to 2mm.

[0015] In one embodiment, the side length of the lower base of the frustum is 0.2mm to 1mm, the height of the frustum is 0.1mm to 1mm, and the distance between two adjacent frustums is 0mm to 0.5mm.

[0016] In one embodiment, the thickness of the first microstructure layer is 0.5 mm to 3 mm, the thickness of the second microstructure layer is 0.10 mm to 0.35 mm, the thickness of the diffuser plate body is 0.2 mm to 0.8 mm, and the size of the diffused particles is 0.1 μm to 20 μm.

[0017] In one embodiment, the first microstructure layer has a plurality of diffused particles; and / or

[0018] The second microstructure layer contains several diffused particles.

[0019] In one embodiment, the rough texture is selected from at least one of orange peel texture, frosted texture, and worm texture.

[0020] In one embodiment, the materials of the diffuser plate body, the first microstructure layer, and the second microstructure layer are independently selected from glass, PMMA, PS, PET, PP, or PC.

[0021] A lighting device comprising the light diffusion plate described above.

[0022] The lighting device of this invention includes a light diffusion plate, which comprises a first microstructure layer, a second microstructure layer, and a diffusion plate body located between the first and second microstructure layers. When light enters through the first microstructure layer, it is initially dispersed. The light is then further dispersed by the diffusion plate body, making the light more uniform. Finally, the light exits through the second microstructure layer, completing the light diffusion process. This improves the utilization rate of the light source, makes the emitted light uniform and soft, and provides anti-glare effects while ensuring uniform light propagation, making it more suitable for various applications. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of a light diffusion plate according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0025] Figure 3 This is a side view of a light diffusion plate according to an embodiment of the present invention. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Please see Figures 1-3 According to one embodiment of the present invention, a light diffusion plate 100 includes a diffusion plate body 110, a first microstructure layer 120, and a second microstructure layer 130. The diffusion plate body 110 is located between the first microstructure layer 120 and the second microstructure layer 130.

[0030] The diffuser plate body 110 contains a plurality of diffuser particles 111, and includes a light-incoming surface 112 and a light-outgoing surface 114. The diffuser particles 111 are microspheres developed using polymer polymerization technology through cross-linking and grafting of functional groups. When light passes through the diffuser plate body 110, the diffuser particles 111 within the diffuser plate body 110 reflect and refract the light, effectively blocking the light source and glaring light while simultaneously making the entire resin emit a softer, more beautiful, and elegant light, achieving a comfortable effect of light transmission without transparency. The light-incoming surface 112 is the side that receives light when it is incident, and the light-outgoing surface 114 is the side from which the light is emitted.

[0031] The material of the diffusion particles 111 is selected from at least one of acrylic acid, organosilicon, silicon dioxide, calcium carbonate, and titanium powder. That is, the diffusion particles 111 can be a single material from these materials, or a combination of two or more materials.

[0032] The first microstructure layer 120 is located on one side of the light-incoming surface 112 of the diffuser plate body 110. The first microstructure layer 120 includes several microstructures 121, each including a frustum 122 on the light-incoming surface 112 and a pyramid 123 on the frustum 122. The upper base of the frustum 122 coincides with the base of the pyramid 123. The sides of the frustum 122 are arranged with alternating triangles and quadrilaterals. The vertices of the triangles furthest from the diffuser plate body 110 coincide with the vertices of the base of the pyramid 123, and the other two vertices of the triangles are located on the lower base of the frustum 122. When light enters the first microstructure layer 120, the several microstructures 121 can reflect and refract the light, thereby changing the original propagation direction of the light and achieving uniform propagation and anti-glare effects after diffusion. The several microstructures 121 can be arranged in rows and columns.

[0033] The second microstructure layer 130 is located on the light-emitting surface 114 of the diffuser plate body 110, and the side of the second microstructure layer 130 away from the diffuser plate body 110 has rough textures 132. The rough textures 132 on the surface of the second microstructure layer 130 mean that the surface of the second microstructure layer 130 is non-planar and has a certain degree of roughness. When light enters the second microstructure layer 130, the rough textures 132 can reflect and refract the light, thereby changing the original propagation direction of the light and achieving uniform propagation and anti-glare effects after diffusion.

[0034] The light diffusion plate 100 described above can reflect and refract the light source at a certain angle, effectively converting the point light source into a surface light source, improving the lighting effect, having a good diffusion effect, a long service life, and effectively suppressing glare, thus achieving the effect of anti-glare while ensuring uniform light propagation.

[0035] Based on the aforementioned implementation, the quadrilateral is a trapezoid, and the lower base of the trapezoid coincides with the edge of the base of the pyramid 123.

[0036] Based on the aforementioned implementation, the side surfaces of the pyramid 123 and the frustum 122 are not coplanar. This is more conducive to the reflection and refraction of light, thereby changing the original direction of light propagation and promoting more uniform light propagation.

[0037] Based on the aforementioned embodiments, the pyramid 123 is a square pyramid, pentagonal pyramid, hexagonal pyramid, or heptagonal pyramid; the side length of the base of the pyramid 123 is 0.5mm to 2mm, and the height of the pyramid 123 is 0.1mm to 2mm. In this case, the pyramid 123 has several non-coplanar lateral faces, which is more conducive to multi-angle reflection and refraction of light, thereby changing the original propagation direction of the light and promoting more uniform light propagation.

[0038] The base side length of the pyramid 123 can be, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm. The height of the pyramid 123 can be, for example, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm.

[0039] Based on the aforementioned embodiment, the side length of the lower base of the frustum 122 is 0.2mm to 1mm, the height of the frustum 122 is 0.1mm to 1mm, and the distance between two adjacent frustums 122 is 0mm to 0.5mm. For example, the side length of the lower base of the frustum 122 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. For example, the height of the frustum 122 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. For example, the distance between two adjacent frustums 122 can be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. When the distance between two adjacent frustums 122 is 0mm, the first microstructure layer 120 has the best effect on uniform light propagation and anti-glare.

[0040] Based on the aforementioned embodiments, the thickness of the first microstructure layer 120 is 0.5 mm to 3 mm, the thickness of the second microstructure layer 130 is 0.10 mm to 0.35 mm, the thickness of the diffuser plate body 110 is 0.2 mm to 0.8 mm, and the size of the diffuser particles 111 is 0.1 μm to 20 μm.

[0041] The thickness of the first microstructure layer 120 can be, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm. The thickness of the second microstructure layer 130 can be, for example, 0.10mm, 0.15mm, 0.20mm, 0.25mm, 0.30mm, or 0.35mm. The thickness of the diffuser plate body 110 can be, for example, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm.

[0042] When the diffusing particle 111 is a microsphere, the size of the diffusing particle 111 refers to the diameter of the microsphere. The size of the diffusing particle 111 can be, for example, 0.1 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, or 20 μm.

[0043] Based on the aforementioned embodiments, the first microstructure layer 120 contains a plurality of diffusing particles; and / or the second microstructure layer 130 contains a plurality of diffusing particles. This further improves the anti-glare effect of the light diffusion plate of the present invention. The size of the diffusing particles is 0.1 μm to 20 μm.

[0044] Based on the aforementioned embodiments, the rough texture 132 is selected from at least one of orange peel texture, frosted texture, and worm texture. When light enters the second microstructure layer 130, these types of rough textures 132 can reflect and refract the light, thereby changing the original propagation direction of the light and making the emitted light diffuse to achieve the purpose of uniform propagation and anti-glare.

[0045] It should be noted that when the rough texture 132 is selected from two or more of the above-mentioned textures, the rough texture 132 is a combination of two or more textures.

[0046] Based on the aforementioned embodiments, the materials of the diffuser plate body 110, the first microstructure layer 120, and the second microstructure layer 130 are independently selected from glass, PMMA, PS, PET, PP, or PC. It should be noted that the materials of the diffuser plate body 110, the first microstructure layer 120, and the second microstructure layer 130 can be the same or different.

[0047] Compared to traditional light diffusers, the light diffuser of this invention comprises a first microstructure layer, a second microstructure layer, and a diffuser body located between the first and second microstructure layers. When light enters through the first microstructure layer, it is initially dispersed. The diffuser body further disperses the light, making it more uniform, and finally, it exits through the second microstructure layer, thus completing the light diffusion process. This improves the utilization rate of the light source, produces uniform and soft emitted light, and provides anti-glare while ensuring uniform light propagation, making it more suitable for various applications.

[0048] The method for preparing the light diffusion plate according to one embodiment is as follows:

[0049] 1. Chips used to prepare the diffuser plate body, the first microstructure layer, and the second microstructure layer, along with additives, are mixed and granulated in a twin-screw extruder to obtain masterbatches. The temperatures of each section of the twin-screw extruder are as follows: Zone 1: 160-220℃; Zone 2: 200-280℃; Zone 3: 195-275℃; Zone 4: 195-275℃; Zone 5: 190-270℃; Zone 6: 190-270℃; and Die head: 185-265℃.

[0050] 2. The above-mentioned masterbatch is mixed evenly with the chips used to prepare the diffuser plate body, the first microstructure layer, and the second microstructure layer in a certain proportion, and then fed into a twin-screw extruder for plasticizing and melting. The main unit temperature of the twin-screw extruder is as follows: Zone 1: 135-215℃; Zone 2: 145-225℃; Zone 3: 155-235℃; Zone 4: 150-230℃; Zone 5: 150-230℃; Zone 6: 150-230℃; Zone 7: 150-230℃; Zone 8: 145-225℃; Zone 9: 145-225℃. The temperatures of each zone of the auxiliary machine are as follows: Zone 1: 135-215℃, Zone 2: 145-225℃, Zone 3: 155-235℃, Zone 4: 150-230℃, Zone 5: 150-230℃, Zone 6: 150-230℃, Zone 7: 150-230℃, Zone 8: 145-225℃, Zone 9: 145-225℃.

[0051] 3. A three-layer structure is obtained through three-layer co-extrusion, with the middle layer being the diffuser plate body. Then, the first microstructure layer and the second microstructure layer are formed on the two outer layers by roll pressing, and the light diffuser plate is obtained after cooling.

[0052] One embodiment of the lighting device includes the light diffusion plate described above.

[0053] In one embodiment, the lighting device is an LED (light-emitting diode).

[0054] The lighting device of this invention includes a light diffusion plate, which comprises a first microstructure layer, a second microstructure layer, and a diffusion plate body located between the first and second microstructure layers. When light enters through the first microstructure layer, it is initially dispersed. The light is then further dispersed by the diffusion plate body, making the light more uniform. Finally, the light exits through the second microstructure layer, completing the light diffusion process. This improves the utilization rate of the light source, makes the emitted light uniform and soft, and provides anti-glare effects while ensuring uniform light propagation, making it more suitable for various applications.

[0055] Referring to the above implementation details, in order to make the technical solution of this application more specific, clear and easy to understand, examples of the technical solution of this application are given below. However, it should be noted that the content to be protected by this application is not limited to the following embodiments 1 to 3.

[0056] Example 1

[0057] The light diffusion plate of Example 1 includes a diffusion plate body, a first microstructure layer, and a second microstructure layer.

[0058] The diffuser plate contains several diffusing particles and includes a light-incoming surface and a light-outgoing surface. The diffusing particles are silicone particles with a diameter of 1 μm. The thickness of the diffuser plate is 0.6 mm.

[0059] The first microstructure layer is located on the light-incoming surface of the diffuser plate. This layer comprises several microstructures, including a frustum on the light-incoming surface and a pyramid on the frustum. The upper base of the frustum coincides with the base of the pyramid. The sides of the frustum are arranged with alternating triangles and trapezoids. The vertices of the triangles furthest from the diffuser plate coincide with the vertices of the pyramid's base, and the other two vertices of the triangles are located on the lower base of the frustum. These microstructures are arranged in rows and columns. The thickness of the first microstructure layer is 1 mm. The pyramid is a hexagonal pyramid with a base side length of 1 mm and a height of 0.5 mm. The lower base of the frustum is a dodecagon with a side length of 0.5 mm and a height of 0.5 mm. The distance between two adjacent frustums is 0.1 mm.

[0060] The second microstructure layer is located on the light-emitting side of the diffuser body, and the side of the second microstructure layer away from the diffuser body has a rough texture. The rough texture is orange peel texture. The thickness of the second microstructure layer is 0.20 mm.

[0061] Example 2

[0062] The light diffusion plate of Example 2 includes a diffusion plate body, a first microstructure layer, and a second microstructure layer.

[0063] The diffuser plate contains several diffusing particles and includes a light-incoming surface and a light-outgoing surface. The diffusing particles are silicone particles with a diameter of 1 μm. The thickness of the diffuser plate is 0.6 mm.

[0064] The first microstructure layer is located on the light-incoming surface of the diffuser plate. This layer comprises several microstructures, including a frustum on the light-incoming surface and a pyramid on the frustum. The upper base of the frustum coincides with the base of the pyramid. The sides of the frustum are arranged with alternating triangles and trapezoids. The vertices of the triangles furthest from the diffuser plate coincide with the vertices of the pyramid's base, and the other two vertices of the triangles are located on the lower base of the frustum. These microstructures are arranged in rows and columns. The thickness of the first microstructure layer is 1 mm. The pyramid is a pentagonal pyramid with a base side length of 1.2 mm and a height of 0.8 mm. The lower base of the frustum is a decagon with a side length of 0.6 mm and a height of 0.6 mm. The distance between two adjacent frustums is 0.1 mm.

[0065] The second microstructure layer is located on the light-emitting side of the diffuser body, and the side of the second microstructure layer away from the diffuser body has a rough texture. The rough texture is orange peel texture. The thickness of the second microstructure layer is 0.20 mm.

[0066] Example 3

[0067] The light diffusion plate of Example 3 includes a diffusion plate body, a first microstructure layer, and a second microstructure layer.

[0068] The diffuser plate contains several diffusing particles and includes a light-incoming surface and a light-outgoing surface. The diffusing particles are silicone particles with a diameter of 1 μm. The thickness of the diffuser plate is 0.6 mm.

[0069] The first microstructure layer is located on the light-incoming surface of the diffuser plate. This layer comprises several microstructures, including a frustum on the light-incoming surface and a pyramid on the frustum. The upper base of the frustum coincides with the base of the pyramid. The sides of the frustum are arranged with alternating triangles and trapezoids. The vertices of the triangles furthest from the diffuser plate coincide with the vertices of the pyramid's base, and the other two vertices of the triangles are located on the lower base of the frustum. These microstructures are arranged in rows and columns. The thickness of the first microstructure layer is 1 mm. The pyramid is a heptagonal pyramid with a base side length of 0.8 mm and a height of 1 mm. The lower base of the frustum is a fourteen-sided polygon with a side length of 0.4 mm and a height of 0.8 mm. The distance between two adjacent frustums is 0.1 mm.

[0070] The second microstructure layer is located on the light-emitting side of the diffuser body, and the side of the second microstructure layer away from the diffuser body has a rough texture. The rough texture is orange peel texture. The thickness of the second microstructure layer is 0.20 mm.

[0071] Comparative Example 1

[0072] This comparative example is a comparative example of Example 1, and the only difference between it and Example 1 is that there is no first microstructure layer.

[0073] The light diffusion plate of Comparative Example 1 includes a diffusion plate body and a second microstructure layer.

[0074] The diffuser plate contains several diffusing particles and includes a light-incoming surface and a light-outgoing surface. The diffusing particles are silicone particles with a diameter of 1 μm. The thickness of the diffuser plate is 0.6 mm.

[0075] The second microstructure layer is located on the light-emitting side of the diffuser body, and the side of the second microstructure layer away from the diffuser body has a rough texture. The rough texture is orange peel texture. The thickness of the second microstructure layer is 0.20 mm.

[0076] Comparative Example 2

[0077] This comparative example is a comparative example of Example 1, and the only difference between it and Example 1 is that there is no second microstructure layer.

[0078] The light diffusion plate of Comparative Example 2 includes a diffusion plate body and a first microstructure layer.

[0079] The diffuser plate contains several diffusing particles and includes a light-incoming surface and a light-outgoing surface. The diffusing particles are silicone particles with a diameter of 1 μm. The thickness of the diffuser plate is 0.6 mm.

[0080] The first microstructure layer is located on the light-incoming surface of the diffuser plate. This layer comprises several microstructures, including a frustum on the light-incoming surface and a pyramid on the frustum. The upper base of the frustum coincides with the base of the pyramid. The sides of the frustum are arranged with alternating triangles and trapezoids. The vertices of the triangles furthest from the diffuser plate coincide with the vertices of the pyramid's base, and the other two vertices of the triangles are located on the lower base of the frustum. These microstructures are arranged in rows and columns. The thickness of the first microstructure layer is 1 mm. The pyramid is a hexagonal pyramid with a base side length of 1 mm and a height of 0.5 mm. The lower base of the frustum is a dodecagon with a side length of 0.5 mm and a height of 0.5 mm. The distance between two adjacent frustums is 0.1 mm.

[0081] Performance testing:

[0082] The light diffusion plates of Examples 1-3 and Comparative Examples 1-2 were tested for transmittance, haze, and Unified Glare Rating (UGR). The test results are shown in Table 1. The test standards or procedures are as follows:

[0083] 1. Visible light transmittance: Tested according to ISO 13468-1 standard;

[0084] 2. Haze: Tested according to ISO 14782 standard;

[0085] 3. Unified Glare Rating (UGR) Test: Optical analysis was performed on the samples of each embodiment using a spectrophotometer, and the corresponding UGR range was measured based on the actual application effect.

[0086] Table 1. Performance test results of the light diffusion plates in Examples 1-3 and Comparative Examples 1-2.

[0087] Examples / Comparative Examples Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Haze (%) 99.1 97.6 98.5 97.1 98.2 Light transmittance (%) 50.2 45.6 42.2 37.7 32.4 UGR <16 <19 <19 <22 <19

[0088] The following conclusions can be drawn from the test results in Table 1 above:

[0089] (1) Comparing Example 1, Example 2 and Example 3, it can be seen that Example 1 has the highest haze and light transmittance and has a low UGR value, indicating that the light diffusion plate of Example 1 can better play the anti-glare effect.

[0090] (2) Comparing Example 1 with Comparative Example 1, Comparative Example 1 has no first microstructure layer in its light diffusion plate. The performance test results show that the haze and transmittance of the light diffusion plate of Example 1 are better than those of the light diffusion plate of Comparative Example 1. Moreover, the UGR value of the light diffusion plate of Example 1 is lower than that of the light diffusion plate of Comparative Example 1. This indicates that setting the first microstructure layer on the light-incoming surface of the light diffusion plate can achieve the anti-glare effect while ensuring uniform light propagation.

[0091] (3) Comparing Example 1 with Comparative Example 2, Comparative Example 2 has no second microstructure layer in its light diffusion plate. The performance test results show that the haze and transmittance of the light diffusion plate of Example 1 are better than those of the light diffusion plate of Comparative Example 2. Moreover, the UGR value of the light diffusion plate of Example 1 is lower than that of the light diffusion plate of Comparative Example 2. This indicates that setting a second microstructure layer on the light-emitting surface of the light diffusion plate can achieve the anti-glare effect while ensuring uniform light propagation.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A light diffusion plate, characterized by, The light diffusion plate comprises: a diffusion plate body having a plurality of diffusion particles therein, the diffusion plate body comprising a light inlet surface and a light outlet surface; a first microstructure layer located on the light inlet surface side of the diffusion plate body, the first microstructure layer comprising a plurality of microstructures, each microstructure comprising a prism located on the light inlet surface and a pyramid located on the prism; the upper base of the prism coincides with the base of the pyramid, the side of the pyramid is not coplanar with the side of the prism, the sides of the prism are alternately arranged by triangles and quadrilaterals, the quadrilateral is a trapezoid, the lower base of the trapezoid coincides with the edge of the base of the pyramid, the vertex of the triangle away from the diffusion plate body coincides with the vertex of the base of the pyramid, and the other two vertices of the triangle are located on the lower base of the prism; and a second microstructure layer located on the light outlet surface side of the diffusion plate body, the second microstructure layer having rough lines on the side away from the diffusion plate body.

2. The light diffusing plate according to claim 1, wherein The pyramid is a quadrangular pyramid, a pentagonal pyramid, a hexagonal pyramid or a heptagonal pyramid. The length of the base of the pyramid is 0.5mm-2mm, and the height of the pyramid is 0.1mm-2mm.

3. The light diffusing plate of claim 1, wherein The length of the lower base of the prism is 0.2mm-1mm, the height of the prism is 0.1mm-1mm, and the distance between adjacent two prisms is 0mm-0.5mm.

4. The light diffusing plate of claim 1, wherein The thickness of the first microstructure layer is 0.5mm-3mm, the thickness of the second microstructure layer is 0.10mm-0.35mm, the thickness of the diffusion plate body is 0.2mm-0.8mm, and the size of the diffusion particles is 0.1μm-20μm.

5. The light diffusing plate of claim 1, wherein The first microstructure layer has a plurality of diffusion particles therein; and / or The second microstructure layer has a plurality of diffusion particles therein.

6. The light diffusing plate of claim 1, wherein The rough lines are selected from at least one of orange peel lines, frosted lines and worm lines.

7. The light diffusing plate of claim 1, wherein The materials of the diffusion plate body, the first microstructure layer and the second microstructure layer are independently selected from glass, PMMA, PS, PET, PP or PC.

8. An illumination device, characterized by The lighting device comprises the light diffusion plate according to any one of claims 1-7.

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