Light Guide Member Groove Angles for Uniform Luminance
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Solution Overview
Problem
Conventional light guide members in backlight units fail to provide uniformly distributed light, leading to non-uniform luminance and image quality issues in display devices, and often require additional optical sheets that increase cost, weight, and size.
Innovation Solution
A light guide member with a plurality of first grooves on one side and second grooves on the opposing side, where the angle of the reflective face of the first grooves increases with distance from the light source, and the second grooves have a constant vertical angle, designed to enhance light distribution and eliminate dark areas, using only a prism sheet as an optical member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light guide members are used to guide light from the light source, then light can be transmitted to the display panel, but the luminance distribution is non-uniform with bright lines and dark areas appearing close to the light source
Solution Approach 1:
The light guide member incorporates grooves with different local properties: the first grooves have reflective faces with angles that increase with distance from the light source, while the second grooves have constant vertical angles. This local variation in groove geometry compensates for the non-uniform light distribution, creating uniform luminance across the display panel.
Solution Approach 2:
The light guide member is segmented into different groove structures: first grooves extending in a first direction with varying reflective face angles, and second grooves extending in a second direction with constant vertical angles. This segmentation allows different regions of the light guide member to handle light distribution differently, achieving overall uniformity.
2Illumination intensity
If additional optical sheets (diffusion sheet and prism sheet) are added to the backlight unit to improve luminance uniformity, then light distribution is improved, but the cost, weight, and size of the backlight unit increase
Solution Approach 1:
The invention merges the light distribution function into the light guide member itself by incorporating grooves with specific geometric configurations. This integration eliminates the need for separate diffusion sheets and prism sheets, reducing the number of components while achieving the same light uniformity function.
Solution Approach 2:
The light guide member is designed to perform multiple functions: it guides light from the light source and simultaneously distributes light uniformly across the display panel through its groove structures. This multi-functionality replaces the need for multiple specialized optical sheets.
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 achieves a substantially uniform luminance distribution and improved image quality by guiding light with increased intensity across the display panel, reducing the need for additional optical sheets and resulting in a thinner and lighter backlight unit.
Implementation Method 1
an angle of a reflective face of the first grooves respectively increase as a distance from the light source increases
Implementation Method 2
a light guide member for guiding light traveling therein
Data Source
AI summary
A light guide member for guiding light received from a light source, the light source illuminating light toward the light guide member, the light guide member may include a plurality of first grooves on a first side of the light guide member, the first grooves extending along a first direction crossing a zero-degree radiation angle of the light from the light source, wherein an angle of a reflective face of the first groove increases approaching away from the light source of the light source.