LED Color Gamut Controller for Accurate White and Saturated Colors
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Solution Overview
Problem
LED lighting systems struggle to produce accurate white and pastel colors while maintaining the ability to produce saturated colors without requiring setting changes or reconfiguration, due to manufacturing variations leading to different color gamuts among LED products.
Innovation Solution
A controller is used to define a central portion of the operating gamut for accurate white and pastel color targeting and the outer portions for saturated colors, blending between these regions based on user requests, utilizing colorimetric data to ensure consistent color production across LED fixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small common color gamut is used to standardize color targeting across different LED products, then color accuracy for white and pastel colors is improved, but the ability to produce saturated colors deteriorates
Solution Approach 1:
The patent applies dynamics by making the color gamut adaptive rather than static. The controller dynamically determines the operational gamut based on the specific LED product's capabilities and the desired color target. When accurate white/pastel colors are requested, the system uses a constrained common gamut for precision. When saturated colors are requested and the LED product supports it, the system expands the gamut to include those saturated regions. This dynamic adjustment resolves the contradiction between color accuracy and color gamut versatility.
Solution Approach 2:
The patent applies local quality by allowing different parts of the color space to have different gamut constraints. The common color gamut is maintained for the central white/pastel region where accuracy is critical, while saturated color regions at the boundaries can extend beyond the common gamut if the specific LED product supports it. This localized approach to gamut management allows simultaneous optimization of both color accuracy in the center and color saturation at the boundaries.
2Adaptability or versatility
If the widest possible color gamut is used to produce saturated colors, then color versatility is improved, but consistency between LED fixtures deteriorates
Solution Approach 1:
The system dynamically adjusts the operational gamut based on the intersection of the common color gamut (ensuring consistency) and the specific LED product's capabilities (enabling versatility). The controller determines which saturated colors are actually achievable by the specific fixture while maintaining consistent behavior across the common gamut. This dynamic approach allows each fixture to operate at its full capability while maintaining system-wide consistency for colors within the common gamut.
Solution Approach 2:
The patent changes the parameter of color gamut from a fixed universal value to a variable that depends on the specific LED product's characteristics and the desired color target. The system modifies the operational gamut parameters based on the intersection of the common gamut and the product-specific gamut, allowing consistent color reproduction across different fixtures while enabling saturated colors when available.
3Adaptability or versatility
If settings are changed or reconfiguration is performed to switch between accurate white points and saturated colors, then color versatility is improved, but ease of operation deteriorates
Solution Approach 1:
The system applies self-service by automatically determining the appropriate operational gamut and color targets without requiring user intervention. The controller autonomously intersects the common color gamut with the specific LED product's capabilities and automatically adjusts the operational parameters. Users simply request colors without needing to change settings or reconfigure the system, and the controller handles the gamut adaptation transparently, resolving the contradiction between versatility and ease of operation.
Data Source
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AI summary
A method of driving a plurality of LED-based light sources to provide accurate white points and saturated color points. The method includes receiving or setting a selectable target chromaticity; determining that the selectable target chromaticity is between two vertices of the global common gamut; defining an inner region within the global common gamut; calculating a first directed distance between the selectable target chromaticity and the transition boundary of the inner region and a second directed distance between the selectable target chromaticity and a straight side of the global common gamut; and modifying the selectable target chromaticity to a modified target chromaticity within a light fixture gamut based at least in part on the calculated first and second directed distances; or generating an activation signal for driving the plurality of light sources based on the selectable target chromaticity based at least in part on the calculated first and second directed distances.