Light-Emitting Structure With Peripheral Reflectors for Uniform Luminance
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving uniform in-plane luminance when reducing the number of light sources, leading to potential luminance unevenness and color deviation in display and lighting applications.
Innovation Solution
A light-emitting device design featuring a main substrate with light sources on the central part and lenses and light reflection members on the peripheral part, where the light reflection members have higher reflectance than the substrate, and the use of differently shaped lenses for various light sources to optimize luminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of light sources is reduced to thin the display apparatus and reduce components, then the device complexity and weight are reduced, but in-plane luminance uniformity deteriorates causing luminance unevenness
Solution Approach 1:
The patent applies local quality by differentiating the optical properties of different regions. The peripheral part of the light-emitting device has higher reflectance than the central part, creating localized optical characteristics that redirect light from the reduced number of central light sources to the peripheral regions, thereby achieving uniform luminance distribution across the entire emission surface despite having fewer light sources
Solution Approach 2:
The patent introduces an intermediary optical element (the peripheral structure with higher reflectance) that mediates between the light sources and the emission surface. This intermediary redirects and redistributes light from the central light sources to the peripheral regions, solving the luminance uniformity problem without requiring additional light sources
2Device complexity
If the number of light sources is reduced, then the device complexity is reduced, but color uniformity deteriorates causing color deviation in the emission surface
Solution Approach 1:
The patent applies local quality by creating different optical environments in different regions. The peripheral part with higher reflectance acts as a localized optical modifier that redistributes light spectrally and spatially, ensuring that color properties remain uniform across the entire emission surface even with reduced light sources
3Length of moving object
If thinning is promoted by reducing light sources, then the length of the display apparatus is reduced, but light diffusion capability deteriorates leading to luminance unevenness
Solution Approach 1:
The patent addresses the light diffusion problem by transitioning from a vertical diffusion approach (requiring multiple light sources stacked vertically) to a horizontal redistribution approach. The peripheral high-reflectance structure redistributes light horizontally across the emission surface, achieving uniform illumination in a thinner configuration
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
This design enhances light uniformity and reduces luminance unevenness across the emission surface, enabling efficient light emission with reduced color deviation, thus improving display performance and illumination homogeneity.
Implementation Method 1
one or more light reflection members that are each disposed on the peripheral part, the light reflection members each having reflectance that is higher than the reflectance of the main substrate
Implementation Method 2
a plurality of lenses are disposed to correspond to the plurality of light sources respectively. The plurality of lenses apply optical effects to beams of light from the plurality of light sources respectively
Data Source
AI summary
Provided is a light-emitting device with reduced in-plane luminance variation. The light-emitting device includes a main substrate, a plurality of light sources, a plurality of lenses, and one or more light reflection members. The main substrate includes a central part and a peripheral part that surrounds the central part. The plurality of light sources are each disposed on the central part of the main substrate. The plurality of lenses are disposed to correspond to the plurality of light sources respectively. The plurality of lenses apply optical effects to beams of light from the plurality of light sources respectively. One or more light reflection members are each disposed on the peripheral part. The light reflection members each have reflectance that is higher than the reflectance of the main substrate.