Backlight Diffusion Layer for Uniform Color and Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing backlight systems for liquid crystal displays suffer from color unevenness and luminance unevenness, which affect the quality of illumination light.
Innovation Solution
A light source device comprising a substrate with multiple light sources, a wavelength conversion member facing the light sources, and a diffusion member between the wavelength conversion member and the light sources, which uniformizes the distribution of traveling direction angles of incident light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight system uses LED light sources with fluorescent substance layers, then the system can provide illumination light, but color unevenness and luminance unevenness occur in the emitted light
Solution Approach 1:
A diffusion member is introduced as an intermediary component between the light sources and the wavelength conversion member. This diffusion member receives light from multiple LED sources and redistributes it uniformly before the light reaches the fluorescent substance layer, thereby eliminating the unevenness caused by the discrete light source arrangement.
Solution Approach 2:
The diffusion member changes the angular distribution parameter of the incident light. By transforming the directional light from individual LEDs into a more isotropic light distribution, the diffusion member ensures uniform illumination across the wavelength conversion member, reducing color and luminance unevenness.
2Device complexity
If light sources are arranged in a conventional backlight system, then the system structure is simple, but the distribution of traveling direction angles of incident light is non-uniform
Solution Approach 1:
The diffusion member serves as a mediating element that maintains the simple overall structure while internally performing the complex function of light redistribution. It transforms non-uniform light from simple LED arrangements into uniform illumination without requiring complex light source positioning.
Solution Approach 2:
The diffusion member passively performs light redistribution through its inherent optical properties without requiring active control mechanisms. The material itself provides the uniformization function through its diffusion characteristics, eliminating the need for additional complex control systems.
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 solution improves the quality of illumination light by reducing color unevenness and luminance unevenness, resulting in a more uniform and high-quality planar light source.
Implementation Method 1
a diffusion member disposed between the wavelength conversion member and the plurality of light sources, and configured to uniformize distribution of traveling direction angle of incident light
Implementation Method 2
a wavelength conversion member disposed to face the plurality of light sources
Data Source
AI summary
A light source device includes: a substrate; a plurality of light sources disposed on the substrate; a wavelength conversion member disposed to face the plurality of light sources; and a diffusion member disposed between the wavelength conversion member and the plurality of light sources, and configured to uniformize distribution of traveling direction angle of incident light.