Reflective Covering Layout for LED Color Mixing and Light Extraction
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Solution Overview
Problem
Current light-emitting devices face limitations in color mixing properties, which affect their ability to produce high-quality color reproduction and luminosity.
Innovation Solution
A light-emitting device configuration that includes a support, first and second light-emitting elements emitting different peak wavelengths, and covering members with specific reflective and light-transmissive portions, where the ratio of reflective particles to the light-transmissive area facilitates improved light mixing and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional covering members are used, then manufacturing is simple, but color mixing properties are insufficient
Solution Approach 1:
The covering member is divided into different regions with distinct functions: a first region containing reflective particles for reflecting light, a second region with light-transmissive portions for transmitting light, and a third region with both reflective and light-transmissive portions. This local differentiation of properties enables optimized color mixing in each region while maintaining overall manufacturing simplicity through a unified covering structure.
2Manufacturing precision
If light-transmissive portions are added to improve light extraction, then color mixing improves, but device complexity increases
Solution Approach 1:
Multiple functions are merged into a single covering member: light reflection, light transmission, and structural protection. The covering member integrates reflective particles, light-transmissive portions, and protective coverage in one component, eliminating the need for separate optical elements and reducing overall device complexity while achieving improved color mixing.
Solution Approach 2:
The covering member serves multiple purposes simultaneously: it protects the light-emitting elements, reflects light to enhance extraction efficiency, transmits light for color mixing, and provides structural support. This multi-functionality reduces the number of separate components needed while achieving superior optical performance.
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
Enhances color mixing properties and light extraction efficiency, leading to improved color reproduction and luminosity in light-emitting devices.
Implementation Method 1
The first covering member contains a plurality of first reflective particles
Implementation Method 2
a first light-transmissive portion above the first reflective portion
Data Source
AI summary
A light-emitting device includes first and second light-emitting elements and first and second covering members respectively containing first and second reflective particles. The first covering member includes a first reflective portion and a first light-transmissive portion. A ratio of an area of the first reflective particles to an area of the first reflective portion is higher than a ratio of an area of the second reflective particles to an area of the second covering member. A ratio of the area of the first reflective particles to an area of the first light-transmissive portion is lower than the ratio of the area of the second reflective particles to the area of the second covering member in the first cross section. A minimum height of the first light-transmissive portion between the first and second light-emitting elements is greater than that of the first light-transmissive portion outward of the first light-emitting element.