RGBW Display Color Correction for Brightness Incongruity
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Solution Overview
Problem
Display apparatuses that use four colors (three primary colors and white) for pixel display can experience a significant difference in brightness between white and normal colors, leading to a sense of incongruity in color appearance, particularly with yellow, magenta, and cyan, as the brain perceives these colors differently due to large luminance ratios.
Innovation Solution
A display apparatus that performs color correction to increase saturation and white component levels in chrominance signals for specific color components like yellow, magenta, and cyan, and alternates between these corrected signals to create a checkered or random pattern on the screen, ensuring consistent brightness across colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a display apparatus uses four colors (RGBW) to increase brightness and contrast, then the luminance ratio between white and normal colors becomes large, but this causes a sense of incongruity in color appearance particularly for yellow, magenta, and cyan
Solution Approach 1:
The patent dynamically changes the luminance ratio parameter between white and color pixels based on the specific color being displayed. For yellow, magenta, and cyan pixels, the white pixel luminance is reduced relative to other colors, compensating for the brain's differential perception of these hues. This parameter adjustment resolves the contradiction by maintaining overall brightness while achieving color appearance consistency.
Solution Approach 2:
The patent applies different luminance ratios locally to different color pixels rather than using a uniform white pixel luminance for all colors. Specifically, yellow, magenta, and cyan pixels have their corresponding white pixel luminance adjusted differently compared to other colors. This local quality approach allows the display to maintain high brightness overall while correcting the specific color appearance incongruity for certain hues.
2Illumination intensity
If the luminance ratio of white to RGB is increased to enhance brightness, then the overall brightness improves, but the brightness difference between white and normal colors becomes excessive causing visual incongruity
Solution Approach 1:
The patent dynamically adjusts the luminance ratio parameter based on the color content of each pixel. When yellow, magenta, or cyan pixels are detected, the corresponding white pixel luminance ratio is reduced to maintain visual coherence. This selective parameter change preserves the brightness enhancement benefit while eliminating the visual incongruity for specific colors.
Solution Approach 2:
The patent implements a feedback mechanism where the color content of pixels is analyzed and used to adjust the white pixel luminance in subsequent processing. This feedback loop ensures that the luminance ratio is optimized for each color type, maintaining both brightness and visual coherence by compensating for the brain's differential perception of various hues.
Data Source
AI summary
A display apparatus, which makes one pixel displayable in four colors, that is, three primary colors and a white color, and inputs and displays chrominance signals corresponding to a mixing ratio of the four colors, includes a color correction instrument which performs first color correction of increasing the saturation of chrominance signals, and a second color correction of decreasing at least the saturation of the chrominance signals, when a predetermined color component exists in the chrominance signals corresponding to a pixel, selection instrument which switches temporally and selects either of first chrominance signals obtained by the first color correction, and second chrominance signals obtained by the second color correction, and a display instrument which displays the chrominance signals, which are selected, in the pixel.