Color-Mixing Lighting Control Method for LED Brightness Stability
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Solution Overview
Problem
Current LED-based color-mixing lighting systems consume excessive power and exhibit inconsistent brightness when producing white light by directly outputting red, green, and blue values, as they require three times the current of monochromatic light and result in superimposed brightness that differs from monochromatic light.
Innovation Solution
A color-mixing lighting control method and system that determines the maximum light intensity value and calculates the light intensity percentage of each emission color, generating corrected light intensity values to control light-emitting elements, ensuring consistent brightness and power efficiency by maintaining color proportion and stabilizing light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If red, green, and blue values are directly output to drive multi-color LED chip, then color mixing to produce white light is achieved, but current consumption becomes about three times that of monochromatic light
Solution Approach 1:
The patent transforms the control parameters from direct RGB values to corrected light intensity values based on luminous efficiency ratios. By calculating corrected values using the formula: corrected_value = original_value × (reference_luminous_efficiency / actual_luminous_efficiency), the system adjusts current distribution to achieve monochromatic-like brightness while reducing total current consumption to approximately one-third of conventional methods.
2Illumination intensity
If red, green, and blue values are directly output to drive multi-color LED chip, then color mixing to produce white light is achieved, but brightness of multi-color mixing light becomes superimposed and much different from monochromatic light
Solution Approach 1:
The patent introduces luminous efficiency correction factors to transform original RGB control values into corrected light intensity values. By multiplying original values by correction ratios (reference luminous efficiency divided by actual luminous efficiency), the system compensates for the superimposed brightness effect, achieving consistent monochromatic-like brightness output across different color channels.
3Use of energy by moving object
If corrected light intensity values are calculated and used to control light-emitting elements, then power saving effect is achieved, but calculation complexity increases
Solution Approach 1:
The patent pre-calculates and stores luminous efficiency ratios for different LED chips during the design phase. These reference values are embedded in the control system, allowing runtime correction calculations to use simple multiplication rather than complex iterative optimization, thereby reducing computational complexity while maintaining power savings.
Solution Approach 2:
The patent transforms the control approach from direct RGB value output to corrected light intensity value output based on luminous efficiency parameters. By establishing a linear correction model with pre-determined ratios, the system achieves power savings through optimized current distribution without requiring complex real-time calculation algorithms.
4Illumination intensity
If corrected light intensity values are calculated and used to control light-emitting elements, then luminous brightness consistency with monochromatic light is achieved, but control process becomes more complex
Solution Approach 1:
The patent performs preliminary measurement and calculation of luminous efficiency ratios for each LED chip during manufacturing or initialization. These pre-computed correction factors are stored in lookup tables, enabling the control system to achieve monochromatic-like brightness consistency through simple multiplication operations rather than complex real-time calculations.
Solution Approach 2:
The patent introduces luminous efficiency correction parameters to transform original control values into corrected light intensity values. By establishing a linear correction model with pre-determined ratios, the system achieves brightness consistency with monochromatic light while keeping the control process relatively simple through straightforward mathematical operations.
Data Source
AI summary
A color-mixing lighting control method is used for receiving an original color-mixing light data to control a color-mixing light source. The color-mixing light source includes a plurality of light-emitting elements to produce a plurality of emission colors. The original color-mixing light data includes a plurality of original light intensity values corresponding to the emission colors. The color-mixing lighting control method comprising: determining a maximum value of the original light intensity values; calculating the light intensity percentage of each of the emission colors in the original color-mixing light data according to the original light intensity values; generating the corrected light intensity value of each of the emission colors according to the maximum value and the light intensity percentage of each of the emission colors; and respectively controlling the light-emitting elements by using the corresponding corrected light intensity value of each of the emission colors.