Backlight Diffusion Layout for Uniform Wavelength Conversion
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Solution Overview
Problem
Backlight systems in liquid crystal displays face challenges in achieving uniformity in illumination, leading to color and luminance unevenness due to the viewing angle dependency of chromaticity distribution in fluorescent substance layers.
Innovation Solution
A light source device is designed with a substrate, multiple light sources, a wavelength conversion member, and a diffusion member between them, which uniformizes the distribution of incident light traveling directions, improving illumination quality by reducing color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fluorescent substance layer is disposed separately from the light source to obtain white light, then the structure allows flexibility in design, but color unevenness and luminance unevenness occur due to viewing angle dependency of chromaticity distribution
Solution Approach 1:
A diffusion member is introduced as an intermediary component between the light source and the fluorescent substance layer. This diffusion member uniformizes the distribution of traveling direction angles of incident light, thereby suppressing viewing angle dependency of chromaticity distribution and reducing color unevenness without complicating the overall structure
Solution Approach 2:
The invention changes the parameter of light distribution by controlling the traveling direction angle distribution through the diffusion member. By uniformizing this parameter, the chromaticity distribution becomes more consistent across different viewing angles, improving illumination uniformity
2Illumination intensity
If light from a light emitting element enters a light emission surface of the fluorescent substance layer from a vertical direction or substantially vertical direction, then viewing angle dependency of chromaticity distribution is suppressed, but illumination light quality can be further improved
Solution Approach 1:
The diffusion member serves as an intermediary that naturally uniformizes the incident light distribution without requiring precise control mechanisms. This approach achieves improved illumination quality while avoiding the need for high-precision manufacturing and assembly processes
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 effectively suppresses color unevenness and enhances the quality of illumination light by uniformly distributing the traveling direction angles of incident light, resulting in improved display performance.
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.