Light Emitting System Control for Wide CCT and High CRI
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Solution Overview
Problem
Existing light emitting systems can only switch between limited color temperatures, leading to chromaticity deviation and color distortion when attempting to expand the adjustable range, and fail to maintain good color rendering.
Innovation Solution
A method for a light emitting system that adjusts mixed light across a wide color temperature range by correlating target color temperature with individual light emitting elements, setting emission powers based on calculated correlation percentages, and ensuring chromaticity deviation within a 7-step MacAdam Ellipse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the adjustable color temperature range is expanded in traditional light emitting systems, then more color temperature options are available, but the chromaticity deviation value (Duv) exceeds the 7-step MacAdam Ellipses causing color distortion
Solution Approach 1:
The patent segments the light emitting system into four distinct light emitting elements with specific color coordinates: first element (0.16-0.22, 0.23-0.30), second element (0.37-0.47, 0.36-0.43), third element (0.53-0.6, 0.4-0.45), and fourth element (0.645-0.68, 0.32-0.335). By independently controlling the emission power of each segmented element, the system can precisely adjust color temperature across a wide range (1000K-12000K) while maintaining chromaticity deviation within the 7-step MacAdam Ellipses, thus resolving the contradiction between expandable color temperature range and chromaticity precision.
2Adaptability or versatility
If blue light emitting diodes, red light emitting diodes, and white light emitting diodes are used for adjustment, then color temperature adjustment is possible, but good color rendering cannot be achieved when providing mixed light at high color temperatures
Solution Approach 1:
The patent applies local quality by assigning specific chromaticity ranges to each of the four light emitting elements. The first element (0.16-0.22, 0.23-0.30) provides warm white light, the second element (0.37-0.47, 0.36-0.43) provides cool white light, the third element (0.53-0.6, 0.4-0.45) provides yellow-green light, and the fourth element (0.645-0.68, 0.32-0.335) provides red light. This localized chromaticity assignment allows the system to achieve both wide color temperature adjustment range and excellent color rendering (Ra>90, R9>50) even at high color temperatures, resolving the contradiction between adjustability and color rendering reliability.
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
Achieves high color rendering with low chromaticity deviation and accurate color reproduction across a broad color temperature range, meeting various lighting needs without noticeable color differences.
Implementation Method 1
a first light emitting element 101, a second light emitting element 103, a third light emitting element 105, and a fourth light emitting element 107
Implementation Method 2
The first light emitting element 101 provides a first colored light... The second light emitting element 103 provides a second colored light
Data Source
AI summary
An adjustment method for a light emitting system and a light emitting system are provided. The light emitting system comprises a plurality of light emitting elements and a control circuit. Each of the light emitting elements has a corresponding lighting setting value. The adjustment method comprises: establishing correlation values between a target color temperature, which ranges from 1000K to 12000K, and the lighting setting values; summing the correlation values to generate a total and calculating a percentage of each of the correlation values relative to the total; and setting emission power of each of the light emitting elements according to the corresponding percentage of each of the light emitting elements. The mixed light that matches the target color temperature is then provided, and the color rendering index (CRI) of the mixed light has Ra>90.