Planar Light Source With Varying Transmittance Sectioning Member
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Solution Overview
Problem
Planar light sources experience luminance non-uniformity in light emission regions due to variations in light transmittance across different areas, leading to uneven illumination in applications like liquid crystal displays.
Innovation Solution
A planar light source design incorporating a light guide member with a groove surrounding the light source placement area and a sectioning member with varying transmittance, where the transmittance is higher at areas further from the light source center than at areas closer to it, to reduce luminance non-uniformity by optimizing light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light guide member with uniform structure is used, then the structure is simple and easy to manufacture, but luminance non-uniformity occurs in light emission regions
Solution Approach 1:
The sectioning member is designed with spatially varying transmittance properties: the first portion (farther from light source center) has higher transmittance while the second portion (closer to center) has lower transmittance. This local differentiation compensates for the natural light intensity distribution, allowing uniform illumination without complex overall restructuring of the light guide member.
2Illumination intensity
If a sectioning member with varying transmittance is introduced, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The sectioning member is divided into distinct functional portions: a first portion with higher transmittance located farther from the light source center, and a second portion with lower transmittance closer to the center. This segmentation allows each region to perform its specific optical function independently, achieving uniform illumination through modular design rather than complex continuous variation.
3Manufacturing precision
If grooves are added to the light guide member for sectioning, then light emission regions are properly sectioned, but manufacturing complexity increases
Solution Approach 1:
The sectioning function is merged into the sectioning member itself rather than requiring separate grooves in the light guide member. The sectioning member with its built-in transmittance variation performs both the sectioning and the luminance adjustment functions, eliminating the need for additional groove fabrication steps in the light guide member and simplifying the overall manufacturing process.
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 design effectively reduces luminance non-uniformity by increasing light transmission in areas that would otherwise appear dark, resulting in a more uniform and consistent illumination pattern across the light emission regions.
Implementation Method 1
The sectioning member has light reflectivity and disposed in the section defining part
Implementation Method 2
A first portion in the section defining part that is furthest from a center of the light source in a plan view has a transmittance higher than a transmittance of a second portion in the section defining part that is closest from the center of the light source
Data Source
AI summary
A planar light source includes a light source, a light guide member, and a sectioning member. The light guide member has a light source placement part in which the light source is disposed and a section defining part having a groove surrounding the light source placement part. The sectioning member has light reflectivity and is disposed in the section defining part. A first portion in the section defining part that is furthest from a center of the light source in a plan view has a transmittance higher than a transmittance of a second portion in the section defining part that is closest from the center of the light source in the plan view.