Light Guide Member Groove Pitch Design for Backlight Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light guide members in backlight units for display devices suffer from non-uniform luminance distribution, leading to image quality issues and require additional optical sheets that increase cost, weight, and size.
Innovation Solution
A light guide member with a first side featuring a plurality of first grooves and a second side with second grooves of different pitches, designed to receive light from multiple sources, where the second grooves have a smaller pitch than the first grooves, and are formed using a multi-piece mold core method to enhance light dispersion and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light guide members are used, then the backlight unit can provide illumination, but the luminance distribution is non-uniform causing dark areas and bright lines
Solution Approach 1:
The patent applies local quality by positioning light sources at specific locations (corners or edges) of the light guide member rather than uniformly distributing them. This localized placement, combined with reflective members positioned at opposite corners, creates optimized light paths that achieve uniform luminance distribution across the light guide member's surface, resolving the non-uniformity issue while maintaining manufacturing simplicity
Solution Approach 2:
The patent introduces reflective members as intermediary elements between the light sources and the light guide member. These reflective members redirect light from corner/edge positions into the light guide member, acting as mediators that transform the light distribution pattern and eliminate dark areas and bright lines, thereby achieving uniform luminance without requiring complex light source arrangements
2Illumination intensity
If additional optical sheets are added to improve luminance uniformity, then image quality improves, but the cost, weight, and size of the backlight unit increase
Solution Approach 1:
The patent extracts and eliminates the need for additional optical sheets by integrating the luminance uniformity function directly into the light guide member design. Through optimized light source positioning and reflective member placement, the light guide member itself achieves uniform light distribution, removing the requirement for separate diffusion sheets or prism sheets, thereby reducing device complexity, weight, and cost
Solution Approach 2:
The patent makes the light guide member multi-functional by designing it to simultaneously serve as both the light transmission medium and the luminance uniformity control element. The light guide member not only guides light from the source but also inherently distributes it uniformly through its structural design with strategically placed light sources and reflective members, eliminating the need for dedicated optical sheets for uniformity correction
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 provides a uniform and high-brightness light distribution across the display device, eliminating dark areas and bright lines, and reduces the need for additional optical sheets, thereby improving image quality and reducing the overall weight and cost of the backlight unit.
Implementation Method 1
the light guide member including a first side including a plurality of first grooves extending along a first direction and a plurality of second grooves extending along the first direction
Implementation Method 2
The first grooves may have a first pitch and the second grooves having a second pitch
Data Source
AI summary
A light guide member capable of guiding light received from at least a first light source and second light source, wherein the first light source is spaced a distance D3 from the second light source. The light guide member may include a first side including a plurality of first grooves extending along a first direction and a plurality of second grooves extending along the first direction, wherein the first grooves may have a first pitch and the second grooves have a second pitch, the first pitch being different from the second pitch.