Light Guide Member Light Adjusting Holes Luminance Uniformity
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Solution Overview
Problem
Planar light sources with light guide members suffer from luminance non-uniformity in emission regions, which affects the performance of backlights for liquid crystal displays.
Innovation Solution
A light emitting module with a light guide member, sectioning grooves, and light adjusting holes is designed, where the light adjusting holes have a refractive index lower than the light guide member and are positioned to refract light towards the corners of emission regions, reducing luminance non-uniformity by directing light away from the center and increasing brightness in these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light guide members are used for planar light sources, then light distribution and emission control are improved, but luminance non-uniformity occurs in emission regions
Solution Approach 1:
The emission region is divided into multiple sub-regions by introducing sectioning grooves that extend from the light source placement part to the edges of the emission region. This segmentation allows independent control of light distribution in each sub-region, addressing the non-uniformity problem by treating different areas differently
Solution Approach 2:
Light adjusting holes are strategically positioned at specific locations within the emission region where luminance non-uniformity is most pronounced. These holes have different refractive indices than the surrounding light guide member, creating localized optical properties that correct brightness variations in specific areas without affecting the entire emission region uniformly
2Illumination intensity
If light adjusting holes with lower refractive index are introduced, then light is refracted towards corners to reduce luminance non-uniformity, but the structural complexity increases
Solution Approach 1:
The refractive index parameter of the light guide member is varied by introducing holes filled with material having a different refractive index. This parameter change creates optical contrast that directs light rays towards the corners of the emission region, improving brightness distribution without requiring complex mechanical structures
Solution Approach 2:
The light adjusting holes act as intermediary elements between the light source and the emission region edges. These holes serve as optical mediators that refract light rays, redirecting them towards the corners to enhance brightness in those areas while maintaining the overall simplicity of the light guide structure
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 reduces luminance non-uniformity in emission regions, enhancing the brightness of corners and allowing for controlled luminous intensity per region, leading to improved display contrast and image quality.
Implementation Method 1
A refractive index of an inside of the light adjusting hole is lower than a refractive index of the light guide member
Data Source
AI summary
A light emitting module includes: a light guide member including: an emission region defined by a sectioning groove, a light source placement part located in the emission region, and a light adjusting hole that, in a schematic top view, is located between the sectioning groove and the light source placement part; and a light source located in the light source placement part. A refractive index of an inside of the light adjusting hole is lower than a refractive index of the light guide member. In the schematic top view, the light adjusting hole is not positioned on a first straight line connecting a center of the light source and a farthest point in the sectioning groove, the farthest point being farthest from the center of the light source.