Illumination Control Device Reducing Storage Capacity
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Solution Overview
Problem
Existing illumination systems require large storage capacities to store color tables for adjusting luminance and color of LEDs, which increases the size and cost of the microcomputer.
Innovation Solution
The illumination system reduces storage capacity by storing only a color table and a fade table in the ROM, where the duty ratios for each color and reference duty ratios for each brightness stage are used to calculate output duty ratios, thereby minimizing the storage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color tables for all colors and brightness stages are stored in the illumination control device, then the luminance and color adjustment resolution is improved, but the storage unit capacity increases
Solution Approach 1:
The patent segments the duty ratio control into two independent dimensions: color selection (selecting base duty ratios from color table) and brightness adjustment (applying independent brightness coefficients). This segmentation allows the system to achieve fine-grained duty ratio control without storing complete duty ratio values for every color-brightness combination, thereby reducing storage requirements while maintaining resolution.
Solution Approach 2:
The patent changes the control parameters from storing complete duty ratio values to storing base duty ratios and brightness coefficients separately. By changing how the data is structured and stored, the system achieves the same control resolution with significantly reduced storage capacity.
2Manufacturing precision
If complete color tables are stored in the illumination control device, then the color and brightness control precision is improved, but the device complexity increases
Solution Approach 1:
The patent divides the color control data into two segments: base duty ratios for each color (stored in color table) and brightness coefficients (stored in brightness table). This segmentation reduces the complexity of storing complete color tables while maintaining color control precision through the combination of these two smaller data sets.
3Measurement precision
If the frame length of transmitted signals is increased to include complete duty ratio information, then the control precision is improved, but the signal transmission efficiency decreases
Solution Approach 1:
The patent extracts only the essential color information (base duty ratios) from the complete duty ratio control data, separating it from the brightness control information. This extraction allows transmission of shorter frames while maintaining the ability to achieve precise duty ratio control through the combination of transmitted and locally stored data.
Solution Approach 2:
The system performs preliminary action by pre-storing brightness coefficients in the illumination control device. This allows the transmitted signal to be shorter since the brightness adjustment data is already available locally, improving transmission efficiency while maintaining control precision.
Data Source
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AI summary
An illumination control device includes a first acquisition unit that acquires color information and brightness information, a first storage unit that stores duty ratios of a red light emitting element, a green light emitting element, and a blue light emitting element for each piece of color information, a second storage unit that stores a reference duty ratio for each piece of brightness information, a second acquisition unit that acquires the duty ratios of the red, green and the blue light emitting elements corresponding to the color information, a third acquisition unit that acquires the reference duty ratio corresponding to the brightness information, a calculation unit that calculates the output duty ratios by multiplying the duty ratios by the reference duty ratio, and an output unit that outputs the pulse signals with the output duty ratios to the red, green and the blue light emitting elements.