Light-Guiding Roughness Layout for Uniform LED Emission
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Solution Overview
Problem
Existing light-emitting units and devices face issues with brightness uniformity, light-emitting angle, and efficiency, leading to the need for excessive units and increased costs.
Innovation Solution
A light-emitting unit comprising a substrate, a light-emitting element, a light-guiding element with varying roughness portions, and a light-adjusting layer is designed to enhance brightness uniformity and efficiency by controlling light distribution and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If existing light-emitting units are used, then the basic lighting function is achieved, but brightness uniformity is insufficient
Solution Approach 1:
The light-guiding element is divided into different regions (central region with first roughness and peripheral region with second roughness) where each region has different surface roughness properties. This local differentiation allows the central region to maintain higher light intensity while the peripheral region provides broader light distribution, thereby improving overall brightness uniformity across the light-emitting surface.
2Illumination intensity
If existing light-emitting units are used, then the lighting function is provided, but light-emitting angle is insufficient
Solution Approach 1:
Different regions of the light-guiding element are assigned different roughness values to control light emission in different directions. The central region with lower roughness directs light forward, while the peripheral region with higher roughness scatters light to wider angles, thereby expanding the overall light-emitting angle and distribution range.
3Illumination intensity
If existing light-emitting units are used, then the lighting function is achieved, but light-emitting efficiency is insufficient
Solution Approach 1:
The differentiated roughness structure optimizes light extraction efficiency by region: the central region with lower roughness minimizes light scattering and maintains high light extraction efficiency, while the peripheral region with higher roughness ensures complete light distribution. This prevents energy loss and improves overall light-emitting efficiency.
4Illumination intensity
If more light-emitting units are deployed to compensate for performance deficiencies, then lighting coverage is improved, but costs increase excessively
Solution Approach 1:
By implementing a light-guiding element with spatially varying roughness, each light-emitting unit achieves superior lighting coverage and uniformity independently. This eliminates the need to deploy additional units to compensate for performance deficiencies, thereby reducing the total quantity of light-emitting units required and lowering overall system costs.
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 improves brightness uniformity, light-emitting angle, and efficiency, reducing the number of units required and lowering costs by optimizing light emission characteristics.
Implementation Method 1
The light-guiding element includes a central portion, a first portion, and a second portion. The first portion has a first roughness, and the second portion has a second roughness. The first roughness of the first portion is lower than the second roughness of the second portion.
Implementation Method 2
The light-adjusting layer is disposed on the top surface of the light-guiding element. The light-adjusting layer is disposed on the central portion of the light-guiding element.
Data Source
AI summary
A light-emitting unit and a light-emitting device including the same are provided. The light-emitting unit includes a substrate, a light-emitting element, a light-guiding element, and a light-adjusting element. The light-emitting element is disposed on the substrate. The light-guiding element has a top surface. The light-guiding element is disposed on the light-emitting element. The light-guiding element includes a central portion, a first portion, and a second portion. The first portion has a first roughness. The second portion has a second roughness. The light-adjusting layer is disposed on the top surface of the light-guiding element. The light-adjusting layer is disposed on the central portion of the light-guiding element. The first roughness of the first portion is lower than the second roughness of the second portion.