A foamed diffuser plate

Abstract

The utility model discloses a foaming diffusion board, including two mutually independent light transmission layer, be provided with foaming layer between two light transmission layer, the foaming layer inside is provided with cell 3 , the density of light transmission layer is greater than 1g / cm 3 , the density of foaming layer is less than 0.85g / cm 3 , foaming layer and the light transmission layer of both sides of it have at least 0.15g / cm 3 Density difference to protect foaming layer. The utility model discloses can improve the mechanical property of foaming diffusion board.

Description

Technical Field

[0001] This utility model relates to the technical field of diffusion plates, and in particular to a foamed diffusion plate. Background Technology

[0002] Foamed diffuser plates form numerous pores within a resin matrix. These pores provide better light scattering while reducing the overall weight of the quantum dot diffuser plate. During use, a light beam passes through the pores on the surface of the plate and is refracted through the internal refractive layer. The refracted beam then continues to diffuse through the plate. This product is widely used in backlight modules.

[0003] Foamed diffuser panels reduce material usage due to the presence of foam cells, saving at least 10% in production costs compared to non-foamed diffuser panels. However, the presence of these cells, which act like countless micro-cracks, weakens the diffuser panel's load-bearing capacity. Under external forces, these cells are prone to collapse and accelerated fracture, reducing the overall strength of the diffuser panel. Furthermore, careless handling during processing, transportation, and installation can easily lead to panel breakage.

[0004] Therefore, how to improve the mechanical properties of foamed diffusion plates while maintaining production and manufacturing efficiency is a technical problem that urgently needs to be solved. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a foamed diffusion plate that can improve mechanical properties.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a foamed diffusion plate, comprising two independent light-transmitting layers, a foamed layer disposed between the two light-transmitting layers, and foamed pores disposed inside the foamed layer;

[0007] The density of the light-transmitting layer is greater than 1 g / cm³. 3 The density of the foamed layer is less than 0.85 g / cm³. 3 The foamed layer and the light-transmitting layers on both sides have a spacing of at least 0.15 g / cm. 3 The density difference is used to protect the foam layer.

[0008] Furthermore, the interior of the foamed layer is also provided with several perovskite quantum dots.

[0009] Furthermore, when the light-transmitting layer and the foamed layer are made of the same substrate, the pores are distributed in a gradient in the foamed diffusion plate, and the density of the pores gradually decreases from the center to both sides.

[0010] In summary, this utility model has the following beneficial effects:

[0011] (1) A light-transmitting layer is constructed by placing a foamed layer in the middle layer and then creating light-transmitting layers on both sides of it. The foamed layer has a spacing of at least 0.15 g / cm² between it and the light-transmitting layers on both sides. 3 The density difference protects the foam layer, thus preventing the foam cells from breaking under external forces and improving the mechanical properties of the foam diffuser plate.

[0012] (2) When the foamed layer and the light-transmitting layers on both sides are made of the same substrate, the foamed diffusion plate of this patent essentially constitutes a single-layer structure. This single-layer structure forms pores in the middle, and the pores are distributed in a gradient in the foamed diffusion plate, with the density of the pores gradually decreasing from the center to both sides. This simultaneously achieves both improved mechanical properties of the foamed diffusion plate and reduced production costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the product structure of the foamed diffusion plate of this utility model.

[0014] Reference numerals: 1. Transparent layer; 2. Foaming layer; 3. Resin layer; 4. Cell; 5. Perovskite quantum dot. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings.

[0016] like Figure 1 As shown, a foamed diffusion plate includes two independent light-transmitting layers 1, with a foamed layer 2 disposed between the two light-transmitting layers 1. The foamed layer 2 includes a resin layer 3, in which a plurality of pores 4 and a plurality of perovskite quantum dots 5 are distributed.

[0017] In the above, perovskite quantum dots 5 are known materials in the prior art. Reference can be made to our earlier Chinese patent application, publication number CN118165723A, which discloses a perovskite nanocrystalline fluorescent material, its preparation method, and its applications.

[0018] Furthermore, at least one perovskite quantum dot 5 forms a composite structure with the wall of the bubble pore 4. The composite structure is characterized by perovskite quantum dots 5 protruding from the wall of the bubble pore 4.

[0019] That is, at least one end of a perovskite quantum dot 5 is embedded in the resin layer 3, while the other end of the perovskite quantum dot 5 is partially exposed within the pores 4. The composite structure formed by these two elements further enhances the scattering and diffusion of light, making the propagation path of light within the diffuser plate more complex and diverse, thereby contributing to a more uniform light distribution.

[0020] Furthermore, the density of the light-transmitting layer 1 is greater than 1 g / cm³. 3 The density of foam layer 2 is less than 0.85 g / cm³. 3 .

[0021] In this application, the light-transmitting layers 1 (higher density) located on both sides of the foam layer 2 cover the foam layer 2 (lower density), that is, wrap the middle foam layer 2, to prevent the foam cells 4 from breaking under external impact, thereby protecting the middle foam layer 2.

[0022] Furthermore, the material of the light-transmitting layer 1 can be one or more of polystyrene (PS), polycarbonate (PC), polyvinylidene fluoride (PVDF), and polymethyl methacrylate (PMMA).

[0023] The resin layer 3 in the foam layer 2 can also be made of one or more of polystyrene, polycarbonate (PC), polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA).

[0024] In this application, the material of the light-transmitting layer 1 and the material of the resin layer 3 in the foamed layer 2 may be the same or different. Both shall be covered by the scope of protection of this application.

[0025] When the light-transmitting layer and the foamed layer use the same substrate, the pores are distributed in a gradient within the foamed diffuser plate, with the pore density gradually decreasing from the center to the sides. In this case, the foamed diffuser plate of this patent essentially constitutes a single-layer structure. This single-layer structure forms pores in the center, and the pores are distributed in a gradient within the foamed diffuser plate, with the pore density gradually decreasing from the center to the sides. This simultaneously achieves both improved mechanical properties and reduced production costs for the foamed diffuser plate.

[0026] Furthermore, the overall density of the foamed diffusion plate in this application is 0.90-0.95 g / cm³. 3 .

[0027] This application analyzes the results by constructing a ball-dropping experiment, the rules of which are as follows: a 60g steel ball is dropped vertically and naturally from a height of 15cm. The results of the three sets of tests are as follows;

[0028] (1) 0.95–0.97 g / cm³, severe cracking of the board surface at the ball landing point.

[0029] (2) 0.90–0.95 g / cm³, no cracks at the drop point, slight drop mark.

[0030] (3) 0.87–0.89 g / cm³, slight cracks on the board surface at the ball landing point, obvious pit marks.

[0031] Therefore, it is evident that if the density of the foamed diffuser plate is too high, the plate becomes brittle and lacks elasticity, failing the drop ball test. If the density is too low, although the plate has good elasticity and cushioning, the bubbles are too large and the bubble walls are thin. Under the impact of the drop ball, the bubbles (cells 4 and 4) will break and crack under external force. A density of 0.90–0.95 exhibits better performance in all aspects. In the above, the breaking of cells 4 refers to the interconnection and leakage of air between the densely packed bubbles in the foam layer 2. This will reduce the toughness of the diffuser plate, posing a risk of collapse during installation and use.

[0032] Furthermore, the diameter of pore 4 is 4–50 μm. The perovskite quantum dot 5 has a particle size of 10–50 μm.

[0033] Furthermore, the three-layer structure of the foamed diffuser plate in this application is prepared by three-layer co-extrusion using a screw extruder. This is a prior art preparation method and will not be described in detail here.

[0034] It should be noted that the optical diffusion plate referred to in the title of this application includes not only plates, but also films and sheets. This difference in naming due to variations in flexibility should be covered by and incorporated into the explanation of the title of this application.

[0035] The specific embodiments are merely explanations of this utility model and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. A foamed diffusion plate, characterized in that: It includes two independent light-transmitting layers (1), and a foam layer (2) is disposed between the two light-transmitting layers (1). The foam layer (2) has foam pores (4) inside. The density of the light-transmitting layer (1) is greater than 1 g / cm³. 3 The density of the foamed layer (2) is less than 0.85 g / cm³. 3 The foamed layer (2) has a spacing of at least 0.15 g / cm² between it and the light-transmitting layers (1) on both sides. 3 The density difference is used to protect the foam layer (2).

2. The foamed diffusion plate according to claim 1, characterized in that: The overall density of the foamed diffusion plate is 0.90-0.95 g / cm³. 3 .

3. The foamed diffusion plate according to claim 1, characterized in that: The foamed layer (2) also contains several perovskite quantum dots (5).

4. A foamed diffusion plate according to claim 1 or 2, characterized in that: When the light-transmitting layer (1) and the foamed layer (2) are made of the same substrate, the pores (4) are distributed in a gradient in the foamed diffusion plate, and the density of the pores (4) gradually decreases from the center to both sides.

5. A foamed diffusion plate according to claim 4, characterized in that: The material of the light-transmitting layer (1) is selected from one or more of polystyrene (PS), polycarbonate (PC), polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA).

6. A foamed diffusion plate according to claim 4, characterized in that: The resin layer (3) in the foam layer (2) is made of one or more of polystyrene, polycarbonate (PC), polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA).

7. A foamed diffusion plate according to claim 3, characterized in that: The at least one of the perovskite quantum dots (5) forms a composite structure with the walls of the pores (4).

8. A foamed diffusion plate according to claim 7, characterized in that: The composite structure has perovskite quantum dots (5) protruding from the walls of the pores (4).

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