Composite integrally formed quantum dot diffusion plate
By using a composite integrally molded quantum dot diffuser plate, the problem of light non-uniformity caused by unstable interlayer bonding was solved, achieving efficient light conversion and uniform diffusion, and improving structural stability and optical performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG ODIMING OPTOELECTRONICS TECH CO LTD
- Filing Date
- 2025-09-05
- Publication Date
- 2026-06-12
AI Technical Summary
Existing diffuser plates use a multi-layer independent board bonding process, which makes it easy for bubbles and peeling to occur between the layers. This causes irregular reflection of light at the interface, affecting the uniformity of light and increasing light loss.
The composite integrally molded quantum dot diffusion plate includes a bottom support layer, a lower transition layer, a quantum dot functional layer, an upper transition layer, and a surface protective layer. The layers are tightly bonded through a co-extrusion process, and the synergistic effect of the properties of each layer material is utilized to reduce the difference in refractive index at the interface and light loss.
It achieves efficient light conversion and uniform diffusion, avoids bright spots and uneven light color, enhances structural stability and scratch resistance, and meets the light efficiency and reliability requirements of display devices.
Smart Images
Figure CN224354602U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of diffusion plate technology, specifically a composite integrally molded quantum dot diffusion plate. Background Technology
[0002] A diffuser plate is a core component of the backlight module and lighting system of a display device. It mainly uses diffuser particles or surface microstructures inside the plate to refract, reflect and scatter light emitted from point light sources and line light sources multiple times, transforming them into a uniform surface light source. At the same time, it reduces glare and improves light emission efficiency, making it a key component to ensure the uniformity of the display screen and the lighting effect.
[0003] Existing diffuser plates mostly use a multi-layer independent board bonding process. The bottom support layer and the functional layer are bonded together with glue. Due to glue aging or changes in environmental humidity, bubbles and peeling may occur between the layers, causing irregular reflection of light at the interface. This not only increases light loss but also produces local bright spots and dark areas, seriously affecting the uniformity of light.
[0004] To address these issues, this invention provides a composite integrally molded quantum dot diffusion plate. Utility Model Content
[0005] To address the shortcomings of existing technologies, this invention provides a composite integrally molded quantum dot diffusion plate, which solves the aforementioned problems.
[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a composite integrally molded quantum dot diffusion plate, comprising a diffusion plate body, wherein the diffusion plate body is composed of a bottom support layer, a lower transition layer, a quantum dot functional layer, an upper transition layer and a surface protective layer.
[0007] Furthermore, the bottom support layer is a blend of high-impact modified polystyrene and polymethyl methacrylate, with the addition of hindered phenolic antioxidants and phosphite-based auxiliary antioxidants.
[0008] By adopting the above technical solution, the bottom support layer serves as the basic support structure for the entire board, providing mechanical strength and weather resistance, resisting minor impacts and temperature changes in the bottom environment, and reducing the risk of deformation of the board during assembly.
[0009] Furthermore, the lower transition layer is mainly composed of polymethyl methacrylate, mixed with styrene-acrylonitrile copolymer, with added silane coupling agent, and contains an appropriate amount of silica particles, with the silica particles decreasing in distribution from bottom to top.
[0010] By adopting the above technical solution, the difference in refractive index at the interface is reduced through material gradient, and the gradient distribution of diffused particles is used to achieve the initial scattering of light from the bottom layer upwards, avoiding bright spots caused by direct light.
[0011] Furthermore, the quantum dot functional layer uses ethylene-vinyl acetate copolymer as a matrix, uniformly dispersing quantum dots and composite diffusion particles, wherein the composite diffusion particles are a mixture of barium sulfate and titanium dioxide.
[0012] By adopting the above technical solution, the pre-dispersed masterbatch and diffusion particles are mixed twice in a co-extruder and then extruded through the core flow channel of the die, ensuring uniform dispersion of quantum dots.
[0013] Furthermore, the upper transition layer and the lower transition layer are symmetrically arranged in terms of composition.
[0014] By adopting the above technical solution, the energy attenuation of light during the upward process is compensated by the diffusion particle concentration gradient, so that the light can be uniformly transferred to the surface layer; the high light transmittance of polymethyl methacrylate material is used to reduce light loss, ensuring that the light converted by the core layer is efficiently transmitted to the surface.
[0015] Furthermore, the surface protective layer is made of polymethyl methacrylate, with added ultraviolet absorbers and scratch-resistant additives. The ultraviolet absorber is UV-P, and the scratch-resistant additive is nano-sized silica.
[0016] Using the above technical solution, the surface protective layer can resist the influence of the external environment, the ultraviolet absorber can absorb ultraviolet rays and prevent the quantum dots in the core layer from being photo-oxidized by ultraviolet radiation; the scratch-resistant additive improves the surface hardness and avoids scratches during assembly or use from affecting light transmission.
[0017] Beneficial effects
[0018] This invention provides a composite integrally molded quantum dot diffusion plate. Compared with the prior art, it has the following advantages:
[0019] This composite unibody quantum dot diffuser achieves efficient light conversion and uniform diffusion through multi-layer synergy, expanding the color gamut while avoiding bright spots and uneven light color. The unibody molding process ensures tight interlayer bonding and reduces light transmission loss. The bottom layer ensures structural stability, while the surface layer protects the quantum dots from UV damage and improves scratch resistance. It combines excellent optical performance, structural stability, and environmental adaptability to meet the light efficiency and reliability requirements of display devices. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 This is a perspective view of the external structure of this utility model;
[0022] Figure 2 This is a front sectional view of the structure of this utility model;
[0023] Figure 3 yes Figure 2 A magnified structural diagram of A in the diagram.
[0024] In the diagram: 1. Diffuser plate body; 2. Bottom support layer; 3. Lower transition layer; 4. Quantum dot functional layer; 5. Upper transition layer; 6. Surface protective layer. Detailed Implementation
[0025] It should be noted that in the description of the embodiments of this application, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0026] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.
[0027] Reference Figures 1 to 3 This application provides a composite integrally molded quantum dot diffusion plate, including a diffusion plate body 1, which is composed of a bottom support layer 2, a lower transition layer 3, a quantum dot functional layer 4, an upper transition layer 5, and a surface protective layer 6.
[0028] Furthermore, the bottom support layer 2 is a blend of high-impact modified polystyrene and polymethyl methacrylate, with added hindered phenolic antioxidants and phosphite-based auxiliary antioxidants. The lower transition layer 3 is mainly made of polymethyl methacrylate, mixed with styrene-acrylonitrile copolymer, with added silane coupling agent and an appropriate amount of silica particles, and the silica particles are distributed in a decreasing manner from bottom to top. The quantum dot functional layer 4 is based on ethylene-vinyl acetate copolymer, with uniformly dispersed quantum dots and composite diffusion particles. The composite diffusion particles are a mixture of barium sulfate and titanium dioxide. The upper transition layer 5 and the lower transition layer 3 are symmetrically arranged in terms of composition. The surface protective layer 6 is made of polymethyl methacrylate, with added ultraviolet absorbers and scratch-resistant additives. The ultraviolet absorber is UV-P, and the scratch-resistant additive is nano-sized silica.
[0029] In this embodiment, through multi-layer synergy, efficient light conversion and uniform diffusion are achieved, expanding the color gamut while avoiding bright spots and uneven light color. The one-piece molding process ensures tight interlayer bonding and reduces light transmission loss. The bottom layer ensures structural stability, while the surface layer protects quantum dots from UV damage and improves scratch resistance. It combines excellent optical performance, structural stability and environmental adaptability, meeting the display device's requirements for light efficiency and reliability.
[0030] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.
[0031] Working principle: When light enters from the bottom of the diffuser plate, it first enters the bottom support layer 2. The bottom support layer 2 is a blend of high-impact modified polystyrene and polymethyl methacrylate, with added hindered phenolic antioxidants and phosphite auxiliary antioxidants. As the basic support structure of the entire board, it provides a reliable structural support for the upper functional layers with its stable mechanical strength and weather resistance. It can withstand slight impacts and temperature changes in the bottom environment and avoid deviations in the light transmission path due to its own deformation, thus ensuring that the light can be stably and continuously transmitted upward to the next layer. After passing through the bottom support layer 2, the light enters the lower transition layer 3. The lower transition layer 3 is mainly composed of polymethyl methacrylate, mixed with styrene-acrylonitrile copolymer, and contains silane coupling agent. It also contains an appropriate amount of silica particles that decrease in distribution from bottom to top. Due to the gradual transition characteristics between the materials of the lower transition layer 3 and the bottom support layer 2, the refractive index difference at the interface between the two layers can be effectively reduced, thereby reducing the reflection loss of light at the interface. At the same time, the gradient distribution of silica particles causes the light to undergo preliminary scattering during the upward propagation, breaking the concentration of direct light and preventing bright spots from being generated in the subsequent functional layers due to excessive light concentration. This pre-treatment prepares the light for entering the quantum dot functional layer 4. After the preliminary scattering by the lower transition layer 3, the light enters the quantum dot functional layer 4. The quantum dot functional layer 4 uses ethylene-vinyl acetate copolymer as a matrix, uniformly dispersing quantum dots and composite diffusion particles of barium sulfate and titanium dioxide. The pre-dispersed masterbatch and diffusion particles are mixed twice in a co-extruder and extruded through the core flow channel of the die to ensure uniform dispersion of quantum dots. When blue light passes through this layer, the quantum dots are excited to generate red and green light, realizing the expansion of the color gamut of light. At the same time, the composite diffusion particles further mix the converted red, green and blue light through multiple scattering effects, avoiding local fluorescence intensity abnormalities caused by quantum dot agglomeration and ensuring the stability and uniformity of light color conversion.
[0032] The converted mixed light then enters the upper transition layer 5, which is symmetrically configured with components from the lower transition layer 3. The upper transition layer 5 is based on a blend of polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer, containing silica particles distributed in increasing order from bottom to top. Since light experiences energy attenuation due to scattering during its ascent, the upper transition layer 5 compensates for this energy loss by varying the concentration of diffusing particles, resulting in a more uniform energy distribution. Simultaneously, the high light transmittance of PMMA reduces light loss, ensuring that the converted light from the quantum dot functional layer 4 can be efficiently transmitted to the surface protective layer 6. Once the light reaches the surface protective layer 6, which is made of PMMA and contains UV absorbers (UV-P) and scratch-resistant additives (nano-sized silica), it begins to provide protection. Among them, the ultraviolet absorber can absorb the ultraviolet rays incident from the outside, preventing them from penetrating to the quantum dot functional layer 4 and causing photo-oxidative damage to the quantum dots, thereby maintaining the light conversion efficiency of the quantum dots; the scratch-resistant additive increases the hardness of the surface layer, avoiding scratches that may damage the surface integrity during assembly or use, preventing abnormal light scattering caused by scratches, and ensuring that light can pass through the surface layer smoothly. Throughout the process, each layer is integrally formed through co-extrusion process, with tight interlayer bonding and no obvious interface defects, effectively avoiding abnormal reflection or refraction caused by layering when light is transmitted between layers, and ensuring the continuity and efficiency of light conversion, diffusion and transmission.
[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0034] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A composite integrally molded quantum dot diffusion plate, comprising a diffusion plate body (1), characterized in that: The diffuser plate body (1) is composed of a bottom support layer (2), a lower transition layer (3), a quantum dot functional layer (4), an upper transition layer (5), and a surface protective layer (6).
2. The composite integrally molded quantum dot diffusion plate according to claim 1, characterized in that: The upper transition layer (5) and the lower transition layer (3) are symmetrically arranged in terms of composition.