Asymmetric Lens Multi-Chip LED Package for Color Rendering
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Solution Overview
Problem
Conventional LED lighting packages have low color rendering index (CRI) values and poor color rendition, especially when illuminating colored objects, due to non-optimized primary lenses for multiple LED sources, leading to increased costs and reduced adoption of LED products.
Innovation Solution
The use of multiple LED chips emitting different color points, combined with wavelength conversion materials like phosphors, and an asymmetric lens design to achieve improved color rendering and efficiency, with a color temperature of approximately 4000 K and efficacy of at least 100 lumens per watt, allowing for brighter and more efficient lighting solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LED lighting packages use primary lenses for multiple LED sources, then the structure is simple and manufacturing is easier, but the color rendering index (CRI) is low and color rendition is poor
Solution Approach 1:
The patent divides the single lens into multiple specialized lenses, each optimized for specific LED chips. The package includes a first lens for blue LED chips, a second lens for yellow LED chips, and a third lens for red LED chips, with each lens having specific optical properties tailored to its associated LED type. This segmentation allows each lens to be independently optimized for color rendering while maintaining manufacturing feasibility.
Solution Approach 2:
The patent applies different optical properties to different regions of the package by assigning specialized lenses to specific LED chip locations. Each lens has locally optimized characteristics (refractive index, curvature, material composition) matched to the spectral characteristics of its associated LED chips, thereby improving overall color rendering through localized optimization rather than a uniform approach.
2Ease of manufacture
If conventional LED packages use non-optimized lenses, then manufacturing cost is lower, but efficacy and luminous output are reduced
Solution Approach 1:
The patent segments the optical system into multiple specialized lenses, each designed to maximize light extraction and directionality for specific LED chip types. This segmentation enables each lens to be optimized for its specific function, improving overall package efficacy while maintaining cost-effectiveness through targeted optimization rather than comprehensive redesign.
Solution Approach 2:
The patent changes key optical parameters (refractive index, lens curvature, material composition) of each lens to match the spectral and spatial characteristics of associated LED chips. These parameter optimizations improve light extraction efficiency and directional control, thereby increasing overall package efficacy without proportionally increasing manufacturing cost.
3Device complexity
If conventional LED packages use standard lens designs, then device complexity is low, but color temperature control and CRI are insufficient
Solution Approach 1:
The patent controls color temperature and CRI by segmenting the light source into multiple LED chip types (blue, yellow, red) with associated specialized lenses. This segmentation enables independent optimization of each color component, allowing precise control over the overall color temperature and color rendering properties while maintaining manageable device complexity through modular design.
Solution Approach 2:
The patent achieves precise color temperature control through local optimization of each lens-LED pair. Each lens is designed with specific optical properties tailored to its associated LED chip, enabling fine-tuned control over the spectral composition and color characteristics of each color component, which collectively determine the overall color temperature and CRI of the package.
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 provides improved color rendering, brightness, and efficiency at a lower cost, with CRI values exceeding 70 and efficacy of up to 150 lumens per watt, suitable for various lighting applications, including street and indoor lighting.
Implementation Method 1
The use of multiple LED chips emitting different color points, combined with wavelength conversion materials like phosphors
Data Source
AI summary
Light emitter packages having multiple light emitter chips, such as light emitting diode (LED) chips, and related methods are provided. In one aspect, a light emitter package can include a submount, an array of light emitter chips disposed on a portion of the submount, and a lens provided over the submount and covering at least portions of the array. In some aspects, at least some of the light emitter chips can be adapted to emit light of a first dominant wavelength. In further aspects, at least some other light emitter chips are adapted to emit light of a second dominant wavelength that is different than the first dominant wavelength. In some aspects, the lens can be asymmetric. In some aspects, a collective center of the chips, or a center of an array of chips can be offset from a center of the asymmetric lens.