LED Package Wavelength Conversion Layer for Uniform White Light
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Solution Overview
Problem
Current light emitting devices struggle with achieving uniform light output and efficient color rendition, particularly in producing high-quality white light, as single light emitting diode junctions configured to generate white light have not been developed effectively.
Innovation Solution
A light emitting device package comprising a first and second light emitting device with different wavelength bands, a lens, and a wavelength conversion layer that absorbs and converts light to produce a third wavelength band, enhancing light uniformity and efficiency, and a reflecting layer to optimize light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light emitting diode junction is used to generate white light, then device complexity is reduced, but color rendition and light quality are insufficient
Solution Approach 1:
The patent combines multiple light emitting diodes with different wavelength bands (first, second, and third wavelength bands) into a single package to generate white light. This merging approach achieves superior color rendition and light quality compared to single-junction LEDs, while maintaining a integrated package structure that manages complexity through unified design.
Solution Approach 2:
The patent employs a composite structure involving multiple semiconductor materials with different band gaps to emit different wavelength bands. By combining these materials in a multi-junction device, the system achieves broad spectral coverage and high color rendering index, effectively resolving the limitation of single-material LEDs in producing quality white light.
2Manufacturing precision
If multiple light emitting diodes with different wavelength bands are combined, then color rendition is improved, but light uniformity becomes difficult to achieve
Solution Approach 1:
The patent applies local quality by positioning different wavelength band emitting diodes at specific locations within the package and using wavelength conversion layers with spatially varying properties. This allows each region to contribute optimally to the overall light output, achieving uniform mixing of wavelengths while maintaining high color rendition through localized functional zones.
3Manufacturing precision
If a wavelength conversion layer is added to convert light wavelengths, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The wavelength conversion layer serves multiple functions simultaneously: it converts specific wavelength bands to achieve desired color temperature, enhances color accuracy by filling spectral gaps, and contributes to light mixing for uniformity. This multi-functionality justifies the added structural element by delivering multiple performance benefits from a single component.
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 achieves improved light uniformity, efficiency, and color rendition by uniformly mixing blue, yellow, and red light to produce high-quality white light with enhanced color accuracy and wider viewing angles.
Implementation Method 1
a wavelength conversion layer disposed over the lens, the wavelength conversion layer serving to absorb light having the first wavelength band or the second wavelength band so as to emit light having a third wavelength band
Implementation Method 2
a first reflecting layer outwardly spaced apart from the wavelength conversion layer, the first reflecting layer serving to reflect light emitted from the light emitting device and the wavelength conversion layer so as to outwardly emit light from the package
Data Source
AI summary
Disclosed is a light emitting device, and more particularly are a light emitting device package configured to improve the quality of light and a lighting apparatus using the same. The light emitting device package includes a light emitting device located on a package main body, the light emitting device including a first light emitting device configured to emit light having a first wavelength band and a second light emitting device configured to emit light having a second wavelength band, a lens disposed over the light emitting device, and a wavelength conversion layer disposed over the lens, the wavelength conversion layer serving to absorb light having the first wavelength band or the second wavelength band so as to emit light having a third wavelength band.