Multi-Emitter LED Spectrum Mixing for High-CRI Lighting
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Solution Overview
Problem
Existing light emitting diodes (LEDs) face challenges in achieving an improved color rendering index (CRI) and reducing manufacturing costs, while also maintaining reliability and efficiency in light extraction.
Innovation Solution
A light emitting apparatus is designed with a substrate and a light emitting region comprising a first light emitter and a second light emitter. The first light emitter includes a first light emitting device and a first wavelength converter, while the second light emitter includes a second light emitting device. The wavelength converters use a light transmitting layer with dispersed wavelength conversion materials to emit lights with different peak wavelengths, resulting in a third spectrum with enhanced CRI and reduced phosphor content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphor content is increased to improve color rendering index, then CRI is improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the single phosphor layer into multiple wavelength converter layers, each containing different types of wavelength conversion materials with different excitation characteristics. This segmentation allows each layer to contribute differently to the overall spectrum, achieving high CRI without requiring excessive total phosphor content, thereby reducing manufacturing costs while maintaining color rendering performance.
2Reliability
If multiple wavelength conversion materials are used to broaden color gamut, then color reproduction is improved, but device complexity increases
Solution Approach 1:
The patent segments the wavelength conversion function across multiple layers, with each layer containing specific wavelength conversion materials that emit at different wavelengths. This structured segmentation broadens the color gamut by ensuring comprehensive spectral coverage while maintaining manageable device complexity through organized layer architecture.
Solution Approach 2:
Each wavelength converter layer serves multiple functions: it converts specific wavelengths from the blue LED emission, contributes to broadening the overall color gamut, and maintains structural integrity as part of the layered architecture. This multi-functionality reduces the need for additional separate components, thereby controlling device complexity.
3Ease of manufacture
If phosphor content is reduced to lower manufacturing cost, then manufacturing cost is reduced, but color rendering index deteriorates
Solution Approach 1:
The patent applies local quality by assigning different wavelength conversion materials to different layers, with each layer optimized for specific wavelength conversion needs. This localized optimization ensures that each region of the device contributes efficiently to the overall spectrum, achieving high CRI with reduced total phosphor content and lower manufacturing costs.
4Volume of moving object
If apparatus size is reduced for compact design, then miniaturization is achieved, but light extraction efficiency may deteriorate
Solution Approach 1:
The patent transitions from a lateral expansion approach to vertical stacking of wavelength converter layers. This dimensional change allows the device to achieve comprehensive spectral coverage and maintain light extraction efficiency in the vertical dimension while reducing the horizontal footprint, thereby实现ing compact design without sacrificing 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
The proposed solution achieves a higher color rendering index (CRI) and reduces manufacturing costs by minimizing the content of phosphors, while also improving reliability and light extraction efficiency. The apparatus can maintain stability across temperature changes and offers a compact size.
Implementation Method 1
The first wavelength converter includes a first light transmitting layer formed of a light transmitting material and covering the first light emitting device and at least a type of wavelength conversion material
Implementation Method 2
a first light transmitting layer formed of a light transmitting material and covering the first light emitting device
Data Source
AI summary
A light emitting apparatus is disclosed. The light emitting apparatus includes a substrate and a light emitting region disposed on the substrate and including a first light emitter and a second light emitter. The light emitted from the first light emitter has a first spectrum, light emitted from the second light emitter has a second spectrum, The first light emitter includes a first light emitting device emitting light having a first peak wavelength and a first wavelength converter emitting a first light. The second light emitter includes a second light emitting device emitting the second spectrum. The first spectrum and the second spectrum has at least one different peak wavelength. and The light of the light emitting region has a third spectrum that is mixture of the first spectrum and the second spectrum.