Diffuser Plate With Optical Lens And UV Layer For LCD Backlight
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Solution Overview
Problem
Conventional direct-type backlight modules face challenges in achieving high light diffusion efficiency and brightness while minimizing costs, particularly due to the need for multiple optical films and components that increase production complexity and expenses.
Innovation Solution
A diffuser plate design featuring an optical lens on one side of a substrate with a diffusion layer above it, and an ultraviolet light absorbing layer on the other side, which disperses and diffuses light uniformly, reduces the need for additional optical sheets and films, and shields lamps to enhance brightness and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical films (prism sheets, diffusion sheets, brightness enhancement films) are used to enhance brightness and light diffusion, then the brightness and light diffusion efficiency are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple optical functions (light diffusion, brightness enhancement, UV protection) into a single integrated diffuser plate structure. The diffuser plate incorporates a diffusion layer with controlled particle distribution, optical lenses for light collection and redirection, and UV absorbing layers, replacing the need for separate prism sheets, diffusion sheets, and UV protection films, thereby reducing device complexity while maintaining brightness enhancement
Solution Approach 2:
The diffuser plate is designed as a multi-functional component that simultaneously performs light diffusion, brightness enhancement through optical lens refraction, UV radiation protection, and Moire effect elimination. This universal design allows one component to replace multiple specialized films, reducing the overall number of layers while achieving comprehensive optical performance
2Illumination intensity
If the number of diffusion particles is increased to improve light diffusion effect, then the light diffusion efficiency is improved, but the light transmittance decreases
Solution Approach 1:
The diffusion layer employs non-uniform particle distribution with different particle densities in different regions. The particle concentration is optimized locally to achieve sufficient light diffusion in areas requiring it while maintaining higher transmittance in areas where direct light transmission is prioritized, thus balancing diffusion efficiency with light transmittance
Solution Approach 2:
The patent optimizes parameters including particle size distribution, particle concentration gradients, and particle material properties to achieve efficient light diffusion with minimal transmittance loss. By carefully controlling these parameters, the diffusion layer scatters light effectively while allowing sufficient light transmission to maintain brightness
3Reliability
If UV absorbing layer is added to prevent aging and yellowing, then the reliability and lifespan are improved, but the device complexity increases
Solution Approach 1:
The UV absorbing layer is integrated directly into the diffuser plate structure, combining UV protection functionality with the existing diffusion and optical lens layers. This integration approach adds minimal structural complexity while providing comprehensive UV radiation protection against aging and yellowing
Solution Approach 2:
The diffuser plate utilizes composite material structures where UV absorbing compounds are incorporated into the polymer matrix of the diffusion layer or as a separate functional layer. This composite approach provides effective UV protection while maintaining the optical properties of the diffuser plate with minimal additional complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves higher light diffusion efficiency and brightness, reduces manufacturing costs by minimizing the use of diffusion sheets and prism sheets, and extends the lifespan of the diffuser plate by preventing UV-induced aging.
Implementation Method 1
When the light passes through the optical lens, the light is dispersed by a surface of the optical lens
Implementation Method 2
the light is dispersed by a surface of the optical lens on one side of the substrate and then is diffused by the diffusion layer of the optical lens
Implementation Method 3
an ultraviolet light absorbing layer disposed under the other side of the substrate so as to avoid ageing or yellowing of the diffuser plate caused by long term UV radiation
Implementation Method 4
By refraction index and angle of the prisms, the incident light is refracted, passing through the serrated member for control of the refraction angle
Data Source
AI summary
A diffuser plate with higher light diffusion efficiency and brightness applied to backlight module of Liquid Crystal Display TV (LCD TV) for providing uniform light is disclosed. An optical lens with a diffusion layer is disposed on one side of the substrate. The diffusion layer is arranged above the optical lens for enhancing diffusion effect. The other side of the diffuser plate can be a plane or having a lens structure. By Lenticular lens, the homogeneity of emitted light is improved so as to reduce the amount of diffusion particles being added into the diffusion plate Therefore, the light transmission is increased and the brightness is enhanced. Meanwhile, ability of shielding lamps is considered and Moiré effect is eliminated. Moreover, the diffusion layer is co-extruded on surface of the Lenticular lens together with the substrate so that the device is easy to be produced.