Display System Color Temperature Correction Circuit
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Solution Overview
Problem
Electro-optical devices exhibit individual differences in luminance perception due to manufacturing variations, leading to color shifts when displaying dark tones, as the configuration for determining output tone based on bright tone color temperature fails to maintain consistent color temperature across all tones.
Innovation Solution
A display system with a correction circuit that adjusts the color temperature of sub-pixels based on chromaticity, using a first color temperature for high chromaticity and a second, lower color temperature for low chromaticity to maintain consistent white point perception across tones, thereby minimizing color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If output tone is determined based on color temperature measured in bright tone, then color temperature consistency is achieved in bright tones, but color shift occurs in dark tones due to white point shift
Solution Approach 1:
The patent applies dynamics by making the white point selection adaptive rather than fixed. The correction circuit dynamically switches between first and second white points based on the chromaticity of the displayed color. When chromaticity is high (bright tones), the first white point is used; when chromaticity is low (dark tones), the second white point is used. This dynamic adaptation resolves the contradiction by allowing the system to maintain color temperature consistency across varying display conditions.
Solution Approach 2:
The patent changes the parameter of white point color temperature based on display conditions. Instead of using a single fixed white point, the system selects from multiple white points (first and second white points with different color temperatures) depending on the chromaticity level. This parameter change allows the correction circuit to compensate for leakage current effects in dark tones while maintaining accuracy in bright tones.
2Device complexity
If a single white point is used for all tones, then device complexity is reduced, but color accuracy deteriorates in dark tones due to leakage current
Solution Approach 1:
The patent segments the color correction function into two distinct modes using two different white points. Instead of attempting to use a single white point for all conditions, the correction circuit divides the operation into segments: one segment for bright tones (high chromaticity) using the first white point, and another segment for dark tones (low chromaticity) using the second white point. This segmentation allows each white point to be optimized for its specific operating range.
Solution Approach 2:
The patent applies local quality by providing different white point characteristics for different display conditions. The first white point is optimized for bright tone display, while the second white point is specifically designed to compensate for leakage current effects in dark tone display. Each white point has locally optimized properties suited to its intended operating range, improving overall color accuracy without requiring complete redesign of the entire correction system.
3Ease of operation
If color correction is simplified to use fixed white point, then ease of operation is improved, but color shift increases in varying tones
Solution Approach 1:
The correction circuit performs self-service by automatically selecting the appropriate white point based on the chromaticity of the displayed color. The system monitors the chromaticity level and autonomously switches between the first and second white points without requiring manual intervention. This self-service mechanism maintains color consistency across varying tones while keeping the operation simple and automatic.
Data Source
AI summary
A display system includes a display unit that displays pixels with a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and a correction circuit that sets a color temperature for white luminescence. When the pixels perform display in a first tone that is the same tone with the red sub-pixel, green sub-pixel, and blue sub-pixel, the correction circuit sets a first color temperature as a white point. When the pixels perform display in a second tone that is lower than the first tone and that is the same tone with the red sub-pixel, green sub-pixel, and blue sub-pixel, the correction circuit sets a second color temperature different from the first color temperature as the white point.