Unified Color Control for Multi-Color LED Light Sources
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Solution Overview
Problem
Multi-color LED light sources with fewer than four primary colors fail to meet performance requirements for stage lighting due to brightness and color gamut issues, leading to chromatic aberrations and user experience degradation.
Innovation Solution
A unified color control method for multi-color lights, involving a system that sets a unified color control system, calculates target color chromaticity coordinates, and adjusts primary-color duty ratios using linear programming to synchronize color output across different light sources, ensuring consistent corrected colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multi-color LED light sources with four or more primary colors are used, then brightness and color gamut performance improve, but chromatic aberrations and brightness differences between light sources increase
Solution Approach 1:
The system performs preliminary characterization of each light source by measuring the chromaticity coordinates and maximum brightness values of all primary colors under maximum duty ratio conditions. This advance measurement data is stored and used for subsequent color correction calculations, enabling each light source to be pre-profiled for its specific characteristics
Solution Approach 2:
The system dynamically adjusts the duty ratios of different primary colors based on calculated correction values. By changing the illumination parameters (duty ratios) of each primary color channel, the system compensates for manufacturing variations and achieves uniform color output across all light sources
2Illumination intensity
If different light sources are used to meet performance requirements, then brightness and color gamut improve, but unified control difficulty increases
Solution Approach 1:
The control system implements a universal correction algorithm that works across all light sources regardless of their specific characteristics. The system uses the same mathematical framework (solving linear equations with constraints) for all light sources, making the control approach universally applicable while accounting for individual differences through pre-measured parameters
Solution Approach 2:
The system uses feedback from the measured chromaticity coordinates and brightness values to calculate appropriate duty ratio adjustments. This closed-loop approach ensures that each light source's unique characteristics are compensated for, enabling unified control across diverse light sources
3Adaptability or versatility
If light sources with more primary colors are manufactured, then color gamut expands, but differences between light sources increase
Solution Approach 1:
The system treats each primary color channel as an independent segment that can be individually measured and adjusted. By segmenting the color control into separate primary color components (red, green, blue, cyan, yellow, magenta), the system can precisely control each channel's duty ratio to compensate for manufacturing variations while maintaining overall color gamut
Data Source
AI summary
A unified color control method for a multi-color light, including the following control steps: S1: setting unified color control system and color implementation system for different light sources; S2: inputting a target color parameter, and calculating a target color chromaticity coordinate (xt,yt) by the color control system according to the target color parameter: S3: calculating a primary-color duty ratio Di of corrected colors by the color implementation system using a linear programming equation according to the target color chromaticity coordinate (xt,yt), and a chromaticity coordinate value (xi,yi) and a maximum brightness value Yi of each primary color for each light source under a maximum duty ratio, in which i represents an i-th primary color; and S4: updating colors by the light sources according to the primary-color duty ratio Di of corrected colors in step S3.