Light-emitting Module Uniform Luminance via Segmented Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light-emitting devices often exhibit uneven luminance due to their high directivity, leading to variations in brightness across different areas.
Innovation Solution
A light-emitting module design featuring a surface-emitting configuration with a light-guiding plate having recesses for light-emitting elements, a light-transmissive member with wavelength conversion and diffusing layers, and reflective members to control radiation characteristics and distribute light uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If light-emitting elements are used with high directivity, then light emission efficiency is improved, but luminance uniformity deteriorates
Solution Approach 1:
The light-emitting element is divided into multiple independent light-emitting regions (first, second, third light-emitting regions) that emit light in different directions. This segmentation allows each region to contribute to different areas of the display panel, improving overall luminance uniformity while maintaining high emission efficiency from each individual region.
Solution Approach 2:
Different portions of the light-emitting element are designed with different emission characteristics. Specifically, the first light-emitting region has higher luminance than the second and third regions, creating a non-uniform emission pattern that compensates for distance-related luminance variations across the display panel, thereby achieving uniform overall luminance.
2Use of energy by moving object
If high directivity light sources are used, then energy efficiency is improved, but light distribution uniformity deteriorates
Solution Approach 1:
The light-emitting element segments light emission into multiple directional regions, allowing efficient directed light propagation while distributing light coverage across different areas of the display panel, thus maintaining energy efficiency alongside improved distribution uniformity.
Solution Approach 2:
The patent transitions from considering light emission in a single direction to utilizing multiple spatial dimensions by creating light-emitting regions that emit light at different angles and directions, thereby achieving uniform three-dimensional light distribution across the display panel while preserving energy efficiency.
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 unevenness by ensuring consistent light distribution and increased extraction efficiency, enhancing the quality of the light source for applications like liquid-crystal display devices.
Implementation Method 1
a light-transmissive member covering the main light-emitting surface of the light-emitting element
Implementation Method 2
a light-diffusing member disposed on the light-guiding plate
Implementation Method 3
a second light-reflective member covering a portion of the second main surface of the light-guiding plate
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A light-emitting module includes a light-emitting element unit (3) including a light-emitting element (11), a light-transmissive member (10) covering a main light-emitting surface (11c) of the light-emitting element (11), and a first light-reflective member (15) covering lateral surfaces of the light-emitting element (11); a light-transmissive light-guiding plate (1) having a first main surface (1c) and a second main surface (1d) having a recess (1d) accommodating the light-emitting element unit (3); a second light-reflective member (16) covering the second main surface (1d) and the light-emitting element unit (3); and a light-transmissive bonding member (14) disposed in contact with inner lateral surfaces of the recess (1d) and outer lateral surfaces of the light-emitting element unit (3). At least a portion of the first light-reflective member (15) is located outside the recess (1d) in a cross-sectional view, and is in contact with the light-transmissive bonding member (14). The light-transmissive bonding member (14) has an inclined surface (14a) forming an acute angle with a corresponding outer lateral surface of the first light-reflective member (15).