Lambertian diffusion plate and direct type backlight module
Patent Information
- Application Number
- CN202521807173.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-08-25
AI Technical Summary
但是，由于添加了扩散粒子，也会对扩散板性能造成一些不良影响，比如：①在扩散板的注塑成型过程中，扩散粒子可能会引发导致扩散板具有黑点不良的问题；②光线在扩散粒子表面会发生多次散射和反射，部分能量被吸收或返回光源侧，造成透光率降低；③当添加有扩散粒子的扩散板被应用于直下式背光模组中时，容易产生反射杯格子纹理、LED灯珠不均匀等问题；等等
[0015]本实用新型的有益效果是：1）本实用新型通过在所述入光面和所述出光面上分别间隔凸设有多个微结构，以及对所述入光面和所述出光面的雾度值进行优控，可有效改善因添加使用扩散粒子而带来的问题，显著提升了扩散板的光扩散效果，能够实现更加柔和、均匀的照明效果。2）本实用新型所述朗伯式扩散板因完全省去了扩散粒子，还有效降低了加工成本、简化了加工工艺，利于扩散板的加工制作。3）借由本实用新型提供的朗伯式扩散板，可使应用有所述朗伯式扩散板的直下式背光模组及显示装置等产品具有优异的出光性能，实现非常柔和、均匀的照明效果，很好的满足了市场需求。
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Figure CN224873811U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optoelectronic display technology, and in particular to a Lambert diffuser plate and a direct-lit backlight module made therefrom. Background Technology
[0002] Diffuser plates (or light diffusers) are widely used in LCD displays, LED lighting, and imaging display systems. Their main function is to fully scatter incident light to achieve a softer and more uniform illumination effect.
[0003] In existing technologies, diffusion particles are typically added to diffuser plates to improve the uniformity of emitted light and increase the angular range of emitted light. However, the addition of diffusion particles can also have some adverse effects on the performance of the diffuser plate, such as: ① During the injection molding process of the diffuser plate, diffusion particles may cause defects such as black spots; ② Light will undergo multiple scattering and reflection on the surface of the diffusion particles, and some energy will be absorbed or returned to the light source side, resulting in reduced light transmittance; ③ When diffuser plates with added diffusion particles are used in direct-lit backlight modules, problems such as reflective cup grid texture and uneven LED beads are easily generated; and so on.
[0004] In view of the above, this utility model is hereby proposed. Summary of the Invention
[0005] To overcome the above-mentioned defects, this utility model provides a Lambert diffuser plate and a direct-lit backlight module. The Lambert diffuser plate has a simple, novel, and reasonable structure, and has a very good light diffusion effect, which can achieve a softer and more uniform lighting effect, and well meet the usage requirements of products such as direct-lit backlight modules and display devices.
[0006] The technical solution adopted by this utility model to solve its technical problem is: a Lambertian diffuser plate, comprising a plate body made of light-transmitting material, wherein the plate body is provided with an incident light surface and an exit light surface arranged opposite to each other, wherein a plurality of microstructures are respectively protruded at intervals on the incident light surface and the exit light surface, and each microstructure is provided with a light adjustment surface that is inclined relative to the incident light surface or the exit light surface; moreover, the haze value of the incident light surface and the exit light surface ranges from 70% to 90%.
[0007] As a further improvement of this utility model, the microstructures disposed on the light-emitting surface and the light-incident surface are respectively defined as the first microstructure and the second microstructure. The plurality of first microstructures and the plurality of second microstructures are each cubic structures, wherein the end face of the plurality of first microstructures facing away from the light-emitting surface is a plane and is flush with each other; the end face of the plurality of second microstructures facing away from the light-incident surface is also a plane and is flush with each other.
[0008] As a further improvement of this utility model, the end face of each of the first microstructures facing away from the light-emitting surface is a rectangular plane with length and width dimensions of 0.05 to 0.5 mm, and the height of each of the first microstructures relative to the light-emitting surface is 0.01 to 0.1 mm. Each of the second microstructures has a rectangular plane with a length and width of 0.05 to 0.5 mm on one end facing away from the light-incident surface, and the height of each of the second microstructures relative to the light-incident surface is 0.01 to 0.1 mm.
[0009] As a further improvement of this utility model, the ratio of the length of the end face of the first microstructure facing away from the light-emitting surface to the length of the end face of the second microstructure facing away from the light-incident surface is: :1, and, The ratio of the width of the end face of the first microstructure facing away from the light-emitting surface to the width of the end face of the second microstructure facing away from the light-incident surface is also [missing value]. :1.
[0010] As a further improvement of this utility model, the plurality of first microstructures and the plurality of second microstructures are arranged in an array, and the spacing between each two adjacent first microstructures is 0.05-0.5mm, and the spacing between each two adjacent second microstructures is also 0.05-0.5mm.
[0011] As a further improvement of this utility model, the center connection line of a plurality of second microstructures located in any row or column is inclined relative to the center line of the light-incident surface, and the inclination angle is 10° to 80°.
[0012] As a further improvement of this utility model, with the main body of the plate placed horizontally as a reference, one side of the first microstructure and one side of the second microstructure are respectively designed as the light adjustment surface, and the tilt angle of the light adjustment surface relative to the light emitting surface or the light receiving surface is not less than 45° and less than 90°.
[0013] As a further improvement of this utility model, the light-incident surface and the light-exit surface are respectively provided with a plurality of micron-sized third microstructures.
[0014] This utility model also provides a direct-lit backlight module, including a Lambertian diffuser plate, a light source, and an optical film assembly as described in this utility model. The Lambertian diffuser plate is disposed above the light source to uniformly diffuse the light emitted by the light source. The optical film assembly is disposed above the light-emitting surface of the Lambertian diffuser plate to optimize the light emitted from the light-emitting surface.
[0015] The beneficial effects of this utility model are as follows: 1) By providing multiple microstructures at intervals on the light-incident surface and the light-exit surface, and by optimizing the haze value of the light-incident surface and the light-exit surface, this utility model can effectively improve the problems caused by adding diffusion particles, significantly enhance the light diffusion effect of the diffuser plate, and achieve a softer and more uniform lighting effect. 2) The Lambertian diffuser plate of this utility model completely eliminates the need for diffusion particles, effectively reducing processing costs and simplifying the processing technology, which is beneficial for the processing and manufacturing of the diffuser plate. 3) With the Lambertian diffuser plate provided by this utility model, products such as direct-lit backlight modules and display devices using the Lambertian diffuser plate can have excellent light emission performance, achieving a very soft and uniform lighting effect, which well meets market demand. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the Lambert diffuser plate described in Embodiment 1 of this utility model; Figure 2 for Figure 1 An enlarged structural diagram of part A shown in the image; Figure 3 for Figure 1 A top view of the Lambert diffuser plate shown in the diagram; Figure 4 for Figure 3 An enlarged structural diagram of section B shown in the figure; Figure 5 for Figure 1 A schematic diagram of the bottom view of the Lambert diffuser shown in the figure; Figure 6 for Figure 5 An enlarged structural diagram of section C shown in the figure; Figure 7 This is an optical simulation diagram of the diffuser plate under illumination by a light source; where, Figure 7 Figure a) shows an optical simulation diagram of a conventional diffuser plate under light source illumination; Figure b) shows an optical simulation diagram of the Lambertian diffuser plate provided in Example 1 under light source illumination. Figure 8 This is a partial cross-sectional structural diagram of the direct-lit backlight module described in Embodiment 2 of this utility model.
[0017] Referring to the accompanying drawings, the following explanations are provided: 1. Lambert diffuser plate; 10. Plate body; 100. Light-incident surface; 101. Light-exit surface; 11. First microstructure; 12. Second microstructure; 2. Light source; 3. Prism film; 4. Diffuser film; 5. Prism sheet. Detailed Implementation
[0018] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0019] Example 1:
[0020] This embodiment 1 provides a Lambertian diffuser plate; please refer to the appendix. Figures 1-6 As shown, the Lambertian diffuser includes a main body 10 made of a light-transmitting material, which may be, but is not limited to, optical-grade polycarbonate (PC). The main body 10 has an incident light surface 100 and an exit light surface 101 arranged opposite to each other, and a plurality of microstructures are respectively protruded at intervals on the incident light surface 100 and the exit light surface 101. It can be understood that when light is incident on the incident light surface 100, the plurality of microstructures on the incident light surface 100 can change the incident angle and direction of the light, thereby increasing the diversity of the propagation path and angle of the light inside the main body 10. When the light after propagating inside the main body 10 reaches the exit light surface 101, the plurality of microstructures on the exit light surface 101 can further modulate the propagation of the light, emitting the light at different angles and directions, thereby making the light emitted from the diffuser more evenly distributed in all directions, achieving a light diffusion effect close to that of Lambertian diffuser, and realizing a softer and more uniform lighting effect.
[0021] In this embodiment, to further improve the light diffusion effect of the microstructure, the specific implementation structure of the microstructure is optimized as follows: taking the microstructure disposed on the light-emitting surface 101 as the first microstructure 11 and the microstructure disposed on the light-incident surface 100 as the second microstructure 12 as an example, please refer to the appendix. Figures 2-6 As shown: ① The plurality of first microstructures 11 and the plurality of second microstructures 12 are preferably designed as cubic structures, wherein the end face of the plurality of first microstructures 11 facing away from the light-emitting surface 101 is a rectangular plane and is flush with each other, and the length L1 of the end face of the plurality of first microstructures 11 facing away from the light-emitting surface 101 is designed to be 0.05 to 0.5 mm, the width W1 is designed to be 0.05 to 0.5 mm, and the height H1 of the plurality of first microstructures 11 relative to the light-emitting surface 101 is designed to be 0.01 to 0.1 mm; The end face of the plurality of second microstructures 12 facing away from the light-incident surface 100 is also a rectangular plane and is flush with each other. Moreover, the length dimension L2 of the end face of the plurality of second microstructures 12 facing away from the light-incident surface 100 is designed to be 0.05 to 0.5 mm, the width dimension W2 is designed to be 0.05 to 0.5 mm, and the height H2 of the plurality of second microstructures 12 relative to the light-incident surface 100 is designed to be 0.01 to 0.1 mm.
[0022] Understandably, by optimizing the length, width, and height of the first microstructure 11 and the second microstructure 12 as described above, this embodiment achieves an optimal balance between the processing requirements of the diffusion plate, the assembly size requirements of the diffusion plate, and the light diffusion effect requirements of the diffusion plate, thus well meeting product requirements.
[0023] ② Based on the above-mentioned optimized control of the length, width, and height dimensions of the first microstructure 11 and the second microstructure 12, this embodiment further specifies that: the ratio of the length L1 of the end face of the first microstructure 11 facing away from the light-emitting surface 10 to the length L2 of the end face of the second microstructure 12 facing away from the light-incident surface 100 is: 1. Furthermore, the ratio of the width dimension W1 of the end face of the first microstructure 11 facing away from the light-emitting surface 101 to the width dimension W2 of the end face of the second microstructure 12 facing away from the light-incident surface 100 is also 1. 1. Thus, when the first microstructure 11 and the second microstructure 12 have the same height, the volume of the first microstructure 11 is larger than the volume of the second microstructure 12. Understandably, the smaller volume of the second microstructure 12 can better match the light emission characteristics of the light source, can more finely modulate the light, and can reduce the reflection loss of the light on the light incident surface 100, thereby significantly improving the light diffusion effect. The larger volume of the first microstructure 11 can provide a wider light emission angle, that is, it can scatter and mix the light over a larger range, thereby achieving a more uniform distribution of light in all directions and significantly improving the light diffusion effect.
[0024] ③ The plurality of first microstructures 11 and the plurality of second microstructures 12 are arranged in an array, and the spacing G1 between any two adjacent first microstructures 11 is designed to be 0.05–0.5 mm, and the spacing G2 between any two adjacent second microstructures 12 is also designed to be 0.05–0.5 mm. It is understandable that by arranging the plurality of first microstructures 11 and the plurality of second microstructures 12 in an array, the light mixing effect of the diffuser plate can be significantly improved.
[0025] ④ Based on the array arrangement design of the first microstructure 11 and the second microstructure 12, this embodiment further specifies that: the plurality of first microstructures 11 are arranged in a completely aligned rectangular array, and, please refer to the appendix. Figure 3 As shown, in the rectangular array composed of multiple first microstructures 11, the center line connecting multiple first microstructures 11 located in any row is parallel to the center line C2 of the light-emitting surface 101, and the center line connecting multiple first microstructures 11 located in any column is parallel to the center line C1 of the light-emitting surface 101. Multiple second microstructures 12 are arranged in a staggered rectangular array, and, please refer to the appendix. Figure 5 As shown, the center line connecting the multiple second microstructures 12 located in any row or column is inclined relative to the center line of the light-incident surface 100, and the inclination angle is 10° to 80°. Specifically, see Appendix Figure 5 The illustration shows a scenario where the center line C5 of a plurality of second microstructures 12 located in a certain column is inclined at an angle of 45° relative to the center lines C3 and C4 of the light-incident surface 100. However, it is understood that this embodiment is not limited to this.
[0026] Understandably, by optimizing the array arrangement of the multiple second microstructures 12 as described above, this embodiment can completely eliminate surface interference, thereby generating a large amount of scattered light to enter the plate body 10.
[0027] ⑤ With the main body 10 of the plate placed horizontally as a reference, one side of each of the first microstructures 11 is designed to be inclined relative to the light-emitting surface 101, and one side of each of the second microstructures 12 is designed to be inclined relative to the light-incident surface 100. It is understood that by designing one side of the first microstructure 11 and one side of the second microstructure 12 as inclined surfaces, better modulation of light can be achieved to achieve a better light diffusion effect. Therefore, in this embodiment, one side of the first microstructure 11 and one side of the second microstructure 12, which are designed as inclined surfaces, are also defined as light-adjusting surfaces. Moreover, according to the light diffusion effect requirements, the inclination angle of the light-adjusting surface relative to the light-emitting surface 101 or the light-incident surface 100 is designed to be not less than 45° and less than 90°.
[0028] In addition, in this embodiment, multiple micron-sized third microstructures are fabricated on the light-incident surface 100 and the light-emitting surface 101 using processes such as sandblasting or laser etching. These third microstructures allow the haze value of the light-incident surface 100 and the light-emitting surface 101 to range from 70% to 90%. It is understood that by setting third microstructures on the light-incident surface 100 and the light-emitting surface 101 and optimizing the haze value of these surfaces within an optimal range—for example, a haze value of 70% on the light-incident surface 100—light can be uniformly distributed within the plate body 10; a haze value of 90% on the light-emitting surface 101 can further expand the light diffusion angle, achieving a more diffused light closer to Lambertian diffusion, thus better improving the uniformity and brightness consistency of the emitted light.
[0029] Furthermore, the third microstructure can preferably be a lattice structure, a texture structure, or a pit structure, and the size of the third microstructure can preferably be designed to be 0.2μ to 10μ.
[0030] In addition, this embodiment also conducted performance tests on the Lambertian diffuser plate. The specific test methods and results are as follows: The testing method involved simulating light source illumination on a traditional diffuser plate (i.e., a diffuser plate containing diffusing particles) and the Lambertian diffuser plate provided in Example 1. The simulations used the same number of 1000 illumination rays, with almost identical exit angles. The simulation results are attached. Figure 7 As shown.
[0031] From the appendix Figure 7 As can be seen, the traditional diffuser plate generates more scattered and reflected light, resulting in a smaller and less dense amount of light emitted through it; while the light emitted through the Lambert diffuser plate provided in this embodiment 1 is very dense.
[0032] The above tests verify that the Lambertian diffuser provided in this embodiment 1 can effectively improve the problems caused by the addition of diffuser particles, significantly improve the light diffusion effect of the diffuser, and achieve a softer and more uniform lighting effect.
[0033] Example 2:
[0034] Please see the appendix Figure 8 As shown, this embodiment 2 provides a direct-lit backlight module, which includes a Lambertian diffuser plate 1, a light source 2, and an optical film assembly as provided in embodiment 1 above. The Lambertian diffuser plate 1 is disposed above the light source 2 to uniformly diffuse the light emitted from the light source 2. The optical film assembly is disposed above the light-emitting surface 101 of the Lambertian diffuser plate 1 to optimize the light emitted from the light-emitting surface 101.
[0035] Furthermore, the optical film assembly includes a prism film 3, a diffusion film 4, and a prism sheet 5 arranged sequentially from bottom to top.
[0036] Based on the functional advantages of the Lambert diffuser plate obtained in Embodiment 1, the direct-lit backlight module provided in Embodiment 2 has excellent light output performance and can achieve a very soft and uniform lighting effect.
[0037] Note: The prefixes "first", "second", etc. in the component names in this specification (such as first microstructure, second microstructure, etc.) are only for clarity of description and are not intended to limit the scope of implementation of this invention.
[0038] In summary, compared with the prior art, the Lambertian diffuser plate of this utility model has a simple, novel, and reasonable structure, and has a very good light diffusion effect, which can achieve a softer and more uniform lighting effect, and well meet the usage requirements of products such as direct-lit backlight modules and display devices.
[0039] Many specific details have been set forth in the above description to provide a full understanding of this utility model. However, the above description is only a preferred embodiment of this utility model, and this utility model can be implemented in many other ways different from those described herein. Therefore, this utility model is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, shall still fall within the protection scope of the technical solution of this utility model.
Claims
1. A Lambert-type diffuser plate, characterized in that: The plate body (10) is made of a light-transmitting material. The plate body (10) has a light-incident surface (100) and a light-exit surface (101) arranged opposite to each other. A plurality of microstructures are respectively protruded on the light-incident surface (100) and the light-exit surface (101). Each microstructure has a light-adjusting surface that is inclined relative to the light-incident surface (100) or the light-exit surface (101). Moreover, the haze value of the light-incident surface (100) and the light-exit surface (101) is in the range of 70% to 90%.
2. The Lambert diffuser plate according to claim 1, characterized in that: The microstructures disposed on the light-emitting surface (101) and the light-incident surface (100) are respectively defined as the first microstructure (11) and the second microstructure (12). The plurality of first microstructures (11) and the plurality of second microstructures (12) are respectively cubic structures, wherein the end face of the plurality of first microstructures (11) facing away from the light-emitting surface (101) is a plane and is flush with each other; the end face of the plurality of second microstructures (12) facing away from the light-incident surface (100) is also a plane and is flush with each other.
3. The Lambert diffuser plate according to claim 2, characterized in that: The end face of each of the first microstructures (11) facing away from the light-emitting surface (101) is a rectangular plane with length and width of 0.05 to 0.5 mm respectively, and the height of each of the first microstructures (11) relative to the light-emitting surface (101) is 0.01 to 0.1 mm. The end face of each of the second microstructures (12) facing away from the light-incident surface (100) is a rectangular plane with length and width of 0.05 to 0.5 mm respectively, and the height of each of the second microstructures (12) relative to the light-incident surface (100) is 0.01 to 0.1 mm.
4. The Lambert diffuser plate according to claim 3, characterized in that: The ratio of the length of the end face of the first microstructure (11) facing away from the light-emitting surface (101) to the length of the end face of the second microstructure (12) facing away from the light-incident surface (100) is: :1, and, The ratio of the width of the end face of the first microstructure (11) facing away from the light-emitting surface (101) to the width of the end face of the second microstructure (12) facing away from the light-incident surface (100) is also [missing information]. :
1.
5. The Lambert diffuser plate according to claim 3, characterized in that: The first microstructures (11) and the second microstructures (12) are arranged in an array, and the spacing between each two adjacent first microstructures (11) is 0.05-0.5 mm, and the spacing between each two adjacent second microstructures (12) is also 0.05-0.5 mm.
6. The Lambert diffuser plate according to claim 5, characterized in that: The center line connecting the multiple second microstructures (12) located in any row or column is inclined relative to the center line of the light incident surface (100), and the inclination angle is 10° to 80°.
7. The Lambert diffuser plate according to claim 2, characterized in that: With the main body (10) of the plate placed horizontally as a reference, one side of the first microstructure (11) and one side of the second microstructure (12) are respectively designed as the light adjustment surface, and the tilt angle of the light adjustment surface relative to the light-emitting surface (101) or the light-incident surface (100) is not less than 45° and less than 90°.
8. The Lambert diffuser plate according to claim 1, characterized in that: The light-incident surface (100) and the light-exit surface (101) are also provided with a plurality of micron-sized third microstructures.
9. A direct-lit backlight module, characterized in that: The device includes a Lambert diffuser (1), a light source (2), and an optical film assembly as described in any one of claims 1-8. The Lambert diffuser (1) is disposed above the light source (2) to uniformly diffuse the light emitted from the light source (2). The optical film assembly is disposed above the light-emitting surface (101) of the Lambert diffuser (1) to optimize the light emitted from the light-emitting surface (101).