Planar Light Source With Through Holes For Chromaticity Adjustment
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Solution Overview
Problem
Existing planar light sources for liquid crystal display devices lack the ability to adjust chromaticity or luminance during manufacturing, limiting their performance and flexibility.
Innovation Solution
A planar light source structure that includes a light guide plate with through holes housing light sources, a wiring substrate, and light transmissive members that allow for the adjustment of chromaticity or luminance by adding phosphors or light diffusing materials during the manufacturing process, enabling precise control over light emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional planar light source structure is used, then the manufacturing process is simple, but the chromaticity and luminance cannot be adjusted during manufacturing
Solution Approach 1:
The light guide plate is divided into multiple unit regions with through holes, allowing independent adjustment of chromaticity and luminance for each region. This segmentation enables selective placement of phosphors and light diffusing materials in specific areas to achieve customized light characteristics without affecting the entire light source uniformly.
Solution Approach 2:
Different types of light transmissive members (first and second light transmissive members with different properties) are placed in different locations within the light guide plate. The first light transmissive member covers lateral faces of light sources while the second covers upper faces, creating local variations in light transmission characteristics to achieve diverse chromaticity and luminance distributions.
2Manufacturing precision
If light transmissive members are added to cover light sources, then chromaticity and luminance can be adjusted, but the manufacturing process becomes more complex
Solution Approach 1:
The light guide plate is pre-formed with through holes and unit region divisions before assembly. This preliminary structuring allows for systematic placement and adjustment of light transmissive members and phosphors during manufacturing, enabling precise control of light emission characteristics while maintaining an organized and manageable manufacturing process.
Solution Approach 2:
Multiple light transmissive members are nested within the same through holes at different positions and orientations. The first light transmissive member is positioned to cover lateral faces while the second light transmissive member covers upper faces, creating a nested arrangement that maximizes adjustment capability within a compact 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
Enables the adjustment of chromaticity or luminance during manufacturing, improving the light source's performance and flexibility, and allowing for more accurate color and luminance distribution in liquid crystal display devices.
Implementation Method 1
a first light transmissive member located in a first of the through holes so as to cover at least a portion of a lateral face of the at least one light source located in the first through hole; and a second light transmissive member located in the first through hole so as to cover at least an upper face of the first light transmissive member
Data Source
AI summary
A method of manufacturing a planar light source includes: providing a wiring substrate; locating a light guide plate on a first principal face of the wiring substrate, wherein the light guide plate includes a plurality of unit regions arranged in one dimension or two dimensions, and a plurality of through holes that are open at the a principal face and a second principal face of the light guide plate, wherein at least one of the through holes is located in the unit regions; locating light sources in the through holes in the unit regions on the first principal face of the wiring substrate; locating a first light transmissive member in a first of the through holes; and locating a second light transmissive member in the first through hole.