Optical Sheet Triangular Microstructures Light Converging
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Solution Overview
Problem
Conventional backlight modules in LCDs face challenges in achieving uniform brightness due to the limitations of diffusion plates and brightness-enhancement films, leading to high production costs and suboptimal light converging effects.
Innovation Solution
An optical sheet with microstructures formed as triangular struts on a substrate, where the distance and base length of the microstructures are optimized to achieve a specific ratio, enhancing the light converging effect and potentially replacing the brightness-enhancement film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a brightness-enhancement film (BEF) is added to enhance light converging effect, then luminosity is improved, but production cost increases significantly
Solution Approach 1:
The patent combines the diffusion function and light converging function into a single integrated optical sheet. The optical sheet includes both light diffusion particles for diffusion and microstructures (prisms or lenses) for light converging, eliminating the need for separate diffusion plate and BEF layers, thus reducing production cost while maintaining luminosity enhancement
Solution Approach 2:
The optical sheet serves multiple functions simultaneously: it diffuses light uniformly and converges light to enhance luminosity. By integrating both diffusion particles and light-converging microstructures in one component, the sheet performs both functions that previously required separate components (diffusion plate and BEF), reducing overall system complexity and cost
2Ease of manufacture
If microstructures are formed on diffusion plate to reduce cost, then production cost decreases, but light converging effect is insufficient
Solution Approach 1:
The patent optimizes key parameters of the microstructures including vertex angle (60°-90° for prisms, 10°-30° for lenses), spacing distance (0.05-0.5mm), and refractive index (1.4-1.7) to achieve optimal light converging effect. These parameter optimizations ensure that the integrated optical sheet can replace expensive BEF while maintaining desirable luminosity enhancement
3Stability of the object's composition
If diffusion plate uses light diffusion particles, then light diffusion is improved, but transmittance decreases to 50%-70%
Solution Approach 1:
The patent applies different properties to different regions of the optical sheet: light diffusion particles are distributed throughout the sheet for uniform diffusion, while light-converging microstructures are positioned on the light-emitting surface to concentrate light in specific directions. This local differentiation allows the sheet to diffuse light uniformly while minimizing overall energy loss and maintaining high transmittance
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
The optical sheet provides a more desirable light converging effect, increasing luminosity by up to 40% compared to conventional diffusion plates and brightness-enhancement films, while reducing production costs by optimizing the distance and base length ratio of the microstructures.
Implementation Method 1
The microstructures 144b are prism structures in a triangular shape... The BEF 144 provides a light converging effect
Data Source
AI summary
An optical sheet with better brightness-enhancing effectiveness includes a substrate and pluralities of microstructures disposed on the substrate. The microstructures are spaced from one another at a distance d. The cross-section of the microstructure is formed in a triangle which has a base length D. Distance d and base length D satisfy the following equation: 0<d/(d+D)≦0.61.