Three-Channel LED Chromaticity Layout for Wide CCT Tuning
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Solution Overview
Problem
Existing light-emitting devices struggle to achieve wide-range CCT tuning while maintaining alignment with the blackbody radiation curve, leading to deviations in chromaticity coordinates during the tuning process.
Innovation Solution
A light-emitting device comprising three light-emitting units with specific chromaticity coordinates and phosphor compositions, allowing for wide-range CCT tuning (1800 K-10000 K) that fits the blackbody radiation curve, with each unit independently driven to adjust current ratios for precise color tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three LED lights with different CCTs are used for wide-range CCT tuning, then the CCT tuning range is expanded, but the CCT tuning trajectory deviates from the blackbody radiation curve
Solution Approach 1:
The patent changes the chromaticity coordinates of the light-emitting units from conventional values to specific optimized values. The first light-emitting unit has chromaticity coordinates (0.32≤x≤0.38, 0.30≤y≤0.34), the second has (0.15≤x≤0.25, 0.20≤y≤0.30), and the third has (0.60≤x≤0.68, 0.36≤y≤0.42). These parameter changes enable the mixed light to accurately fit the blackbody radiation curve while achieving wide-range CCT tuning from 1800K to 10000K.
2Device complexity
If conventional LED lights are used for CCT tuning, then the device structure is simple, but the chromaticity coordinates cannot fit the blackbody radiation curve
Solution Approach 1:
Instead of changing the physical structure or adding complex components, the patent achieves accurate blackbody curve fitting by optimizing the chromaticity parameters of three light-emitting units. The specific parameter ranges for each unit are carefully selected to ensure that their combined output follows the blackbody radiation curve across the 1800K-10000K range.
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 device achieves high luminous efficiency and color tolerance, ensuring CIExy coordinates align with the blackbody radiation curve within a 4-step range, minimizing color shift and maximizing compatibility across different lighting conditions.
Implementation Method 1
a first light-emitting unit, a second light-emitting unit and a third light-emitting unit
Implementation Method 2
a chromaticity point of the first light-emitting unit is located proximate to a blackbody radiation curve
Data Source
AI summary
A light-emitting device includes: a first light-emitting unit with a chromaticity coordinate x ranging from 0.53 to 0.6, and a chromaticity point located proximate to a blackbody radiation curve; a second light-emitting unit with a chromaticity coordinate x ranging from 0.4 to 0.48, and a chromaticity point located above the blackbody radiation curve; and a third light-emitting unit with a chromaticity coordinate x ranging from 0.18 to 0.24, and a chromaticity point located above the blackbody radiation curve. An area surrounded by the chromaticity points of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit covers an area on the blackbody radiation curve with a CCT range of 1800 K to 10000 K, which can achieve a wide-range CCT tuning, and make CIExy coordinates fit the blackbody radiation curve to tune a product during the tuning process.