Light Emitting Device Wall Units and Wavelength Conversion
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Solution Overview
Problem
Conventional light emitting devices face challenges in achieving uniform light emission and reduced color distribution, particularly in illumination applications where high current and light quantity are required.
Innovation Solution
A light emitting device design featuring a support substrate with laminated semiconductor layers, a wall unit surrounding the light emitting laminate, and a wavelength conversion layer positioned above the laminate, where the wall unit is formed to be higher than the laminate and made of metal, and the wavelength conversion layer is adjusted for minimized color distribution by varying phosphor types or content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphors are distributed within the resin unit to emit white light, then light quantity is improved, but color distribution becomes uneven
Solution Approach 1:
The patent segments the wavelength conversion function by placing separate wavelength conversion layers above individual light emitting laminates rather than mixing phosphors throughout a resin unit. Each wavelength conversion layer independently converts light from its underlying laminate, ensuring uniform color distribution while maintaining high light quantity through multiple parallel conversion zones
Solution Approach 2:
The patent introduces wall units as intermediary structures that surround each light emitting laminate and support individual wavelength conversion layers. These wall units act as mediators that organize the spatial relationship between light sources and conversion layers, preventing lateral light leakage and ensuring each conversion layer receives light only from its designated laminate, thereby achieving uniform color distribution
2Illumination intensity
If a reflector is used in the package main body to direct light, then light extraction efficiency is improved, but lateral light leakage occurs
Solution Approach 1:
The patent extracts the light directing function from a conventional reflector and replaces it with wall units that physically surround each light emitting laminate. The wall units are formed to extend higher than the laminates, creating vertical barriers that prevent lateral light leakage while maintaining efficient light extraction through their structured geometry
Solution Approach 2:
The patent converts the potential harmful effect of lateral light leakage into a beneficial structured light distribution pattern. The wall units are designed with specific geometries that not only block lateral leakage but also guide and organize light extraction, transforming what would be wasted light into controlled, efficient illumination
3Illumination intensity
If multiple light emitting laminates are arranged closely to increase light quantity, then illumination intensity is improved, but color distribution uniformity deteriorates
Solution Approach 1:
The patent applies segmentation by providing separate wall units and wavelength conversion layers for each light emitting laminate, even when multiple laminates are closely arranged. This ensures that each laminate's light conversion process remains independent and controlled, preventing color mixing that would occur with shared phosphor reservoirs, thereby maintaining uniform color distribution across the entire array
Solution Approach 2:
The patent implements local quality by allowing each wavelength conversion layer to be independently optimized for its specific underlying light emitting laminate. Each conversion layer can be tailored with appropriate phosphor compositions and thicknesses to match the spectral characteristics of its source laminate, ensuring uniform color output across all laminates regardless of their close proximity
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 extraction efficiency, reduces lateral light leakage, and achieves controlled color distribution, meeting the requirements for uniform illumination while maintaining electrical reliability.
Implementation Method 1
a wavelength conversion layer disposed above the at least one light emitting laminate... The wavelength conversion characteristics of the wavelength conversion layer may be adjusted by differentiating types of phosphors or the content of phosphors contained therein
Implementation Method 2
The wall unit may be made of a metal formed through plating, and may be formed along a circumference of the at least one light emitting laminate
Data Source
AI summary
A light emitting device includes: a support substrate; at least one light emitting laminate having a structure in which semiconductor layers are laminated and formed on the support substrate; a wall unit formed on the support substrate and surrounding the at least one light emitting laminate; and a wavelength conversion layer disposed above the at least one light emitting laminate.