Three-Unit Light-Emitting Device for Blackbody Curve Alignment
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Solution Overview
Problem
Conventional light sources with high CRI values deviate from the blackbody radiation curve due to insufficient red saturation, leading to lower CRI values during full-spectrum white light tuning, especially for intermediate color temperature lights.
Innovation Solution
A light-emitting device comprising three light-emitting units with specific chromaticity coordinates and peak wavelengths, including a first unit with a chromaticity point below the blackbody radiation curve, a second unit above, and a third unit also above, with defined distances and peak wavelength ranges, to achieve full-spectrum white light tuning that fits the blackbody radiation curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional light source with high CRI value is used, then red saturation is improved, but the CIExy coordinates deviate from the blackbody radiation curve during full-spectrum white light tuning
Solution Approach 1:
The patent segments the single light source into three separate light-emitting units with distinct chromaticity characteristics. Each unit contributes differently to the overall spectrum: the first unit (x>0.49, below blackbody curve) provides base illumination, the second unit (0.48>x>0.4, above blackbody curve) adds red saturation, and the third unit (0.31>x>0.22, above blackbody curve) enhances blue region. By independently controlling these segmented units, the patent achieves both high CRI and accurate blackbody radiation curve alignment simultaneously.
Solution Approach 2:
The patent applies local quality by assigning specific chromaticity properties to different light-emitting units based on their positional relationship to the blackbody radiation curve. The first unit is positioned below the curve with higher x coordinate, while the second and third units are positioned above the curve with lower x coordinates. This localized chromaticity distribution allows each unit to contribute optimally to both color rendering and spectral accuracy.
2Illumination intensity
If intermediate color temperature lights are tuned using conventional methods, then brightness is improved, but CRI value decreases due to deviation from blackbody radiation curve
Solution Approach 1:
The patent implements dynamic control by independently adjusting the current ratios of the three light-emitting units based on the desired color temperature. For intermediate color temperatures, the system dynamically optimizes the contribution of each unit: the first unit provides stable base output, the second unit dynamically adjusts red saturation, and the third unit dynamically adjusts blue content. This dynamic coordination ensures that at any color temperature setting, the combined output maintains both high brightness and high CRI by fitting the blackbody radiation curve.
Solution Approach 2:
The patent utilizes parameter changes by varying the chromaticity coordinates and peak wavelengths of the three light-emitting units across different operating conditions. The first unit operates with x>0.49, the second with 0.48>x>0.4, and the third with 0.31>x>0.22. By changing the relative intensities and spectral parameters of these units, the system achieves optimal performance across the full color temperature range while maintaining both brightness and CRI.
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 higher brightness and better luminous efficiency with CIExy coordinates aligning with the blackbody radiation curve, resulting in a CRI greater than 95 and Rf greater than 95, while covering a range from 2700 to 6500K.
Implementation Method 1
a peak wavelength of light emitted by the first light-emitting unit is in a range of 632 nanometers (nm) to 642 nm
Implementation Method 2
a peak wavelength of light emitted by the second light-emitting unit is in a range of 624 nm to 636 nm
Implementation Method 3
a peak wavelength of light emitted by the third light-emitting unit is in a range of 430 nm to 480 nm
Data Source
AI summary
A light-emitting device includes: a first light-emitting unit, a second light-emitting unit and a third light-emitting unit. A chromaticity coordinate x of the first light-emitting unit is 0.65>x>0.49, and a chromaticity point of the first light-emitting unit is below a blackbody radiation curve. A chromaticity coordinate x of the second light-emitting unit is 0.48>x>0.4, and a chromaticity point of the second light-emitting unit is above the blackbody radiation curve. A third light-emitting unit, wherein a chromaticity coordinate x of the third light-emitting unit is 0.31>x>0.22, and a chromaticity point of the third light-emitting unit is above the blackbody radiation curve. The CIExy of the light-emitting device conforms to the blackbody radiation curve during a tuning process.