Planar Light Source Partitioning Overlap for Luminance Uniformity
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Solution Overview
Problem
Existing planar light sources with multiple partitioning members suffer from luminance non-uniformity, which affects the performance and uniformity of light emission.
Innovation Solution
The planar light source incorporates a partitioning member with first and second members, each having partitioned parts with oblique and bottom parts, and outer oblique parts that overlap to reduce gaps and enhance light distribution uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple partitioning members are arranged on a single substrate to increase the light source area, then the light output increases, but luminance non-uniformity occurs at the meeting portions of the partitioning members
Solution Approach 1:
The first outer oblique parts of the first member are made to overlap the second oblique parts of the second member, merging the optical paths and reducing the visibility of boundaries between partitioning members. This overlapping configuration combines the light extraction functions of both members in the overlapping region, eliminating the luminance non-uniformity that would otherwise occur at the meeting portions.
Solution Approach 2:
The partitioning members are configured with oblique parts that extend in the vertical dimension, creating overlapping regions when viewed from the top. This three-dimensional overlapping arrangement allows light to be extracted from multiple depths, uniformizing the luminance across the boundary areas of adjacent partitioning members.
2Use of energy by moving object
If partitioning members with oblique parts are used to improve light extraction, then light extraction efficiency increases, but gaps between members cause luminance non-uniformity
Solution Approach 1:
The overlapping configuration of outer oblique parts merges the light extraction functions of adjacent partitioning members. Light is extracted from both the first member's outer oblique parts and the second member's oblique parts in the overlapping region, combining their effects to eliminate gaps and achieve uniform luminance while maintaining high light extraction efficiency.
3Area of stationary object
If the planar light source is made larger requiring multiple partitioning members, then the light output increases, but the complexity of the structure increases
Solution Approach 1:
The partitioning member is divided into multiple members (first member, second member, etc.), each with partitioned parts arranged in matrices. This segmentation allows the large-area light source to be constructed from modular units that can be independently manufactured and then assembled with overlapping edges, reducing overall structural complexity while maintaining large light output area.
Data Source
AI summary
A planar light source has a plurality of light sources, a substrate, and a partitioning member. The partitioning member includes a first member provided with first partitioned parts each having a first bottom part and first oblique parts surrounding the first bottom part that are arranged on the substrate in a matrix, and a second member provided with second partitioned parts each having a second bottom part and second oblique parts surrounding the second bottom part that are arranged on the substrate in a matrix. The first member further has first outer oblique parts overlapping the second oblique parts located along the outer edge of the second member on the first member side. The first bottom parts and the second bottom parts each have a light source disposition opening, and the light sources are individually disposed on the substrate exposed in the light source disposition openings.