VA Display Sub-Pixel Proportions for Skin Tone Consistency
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Solution Overview
Problem
Existing display technologies, particularly liquid crystal panel displays in vertically aligned mode, exhibit significant color shifts and whitening at large viewing angles, leading to varying display performance across different human skin colors.
Innovation Solution
A method and system that adjust the proportions of red, green, and blue sub-pixels in each pixel based on calculated V-T curves and XYZ values at different viewing angles, using MATLAB software to determine characteristic RGB grayscale values and perform white balance adjustments, ensuring consistent display performance across various skin tones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 8-domain pixel design is used to improve viewing angle performance, then viewing angle performance is improved, but display consistency across different skin colors at different viewing angles still varies greatly
Solution Approach 1:
The patent applies local quality by dividing the pixel into different domains (main pixel and sub-pixel) with different RGB proportions. The sub-pixel has adjusted RGB ratios specifically optimized for certain viewing angles and skin tones, while the main pixel maintains standard ratios. This localized adjustment of color properties in specific pixel regions resolves the contradiction by providing angle-specific optimization without compromising overall display consistency.
Solution Approach 2:
The patent changes the RGB proportion parameters in the sub-pixel to compensate for viewing angle effects. By adjusting the red, green, and blue sub-pixel ratios (e.g., increasing red and blue while decreasing green in certain domains), the display maintains consistent skin tone representation across different viewing angles, thereby resolving the contradiction between viewing angle performance and display consistency.
2Ease of manufacture
If VA display mode is used, then liquid crystal panel display is achieved, but color shift and whitening occur at large viewing angles
Solution Approach 1:
The patent segments the pixel into multiple domains with different characteristics. The main pixel uses standard VA mode for ease of manufacture, while the sub-pixel is segmented into different RGB components with adjusted proportions. This segmentation allows the majority of the pixel to benefit from VA mode manufacturing simplicity while the sub-pixel compensates for color accuracy issues at large viewing angles.
Solution Approach 2:
The patent changes the RGB proportion parameters in the sub-pixel to counteract the color shift and whitening effects inherent in VA display mode at large viewing angles. By adjusting the intensity ratios of red, green, and blue sub-pixels, the display maintains accurate color reproduction even when viewed from oblique angles, resolving the contradiction between manufacturing ease and color accuracy.
3Adaptability or versatility
If different voltages and areas are provided to main pixel and sub-pixel, then spatial mixing improves viewing angle performance, but display performance varies greatly for different skin colors
Solution Approach 1:
The patent applies local quality by assigning different RGB proportions to different pixel domains. The sub-pixel, which contributes to spatial mixing, has specifically adjusted color ratios (e.g., higher red and blue, lower green) that compensate for the viewing angle-dependent color shifts. This localized optimization ensures that skin tones remain consistent across different viewing angles while maintaining the spatial mixing capability for improved viewing angle performance.
Data Source
AI summary
A method and a system for improving a performance at different viewing angles associated with displaying different human skin colors are provided. Based on a V-T curve and an XYZ data of WRGB at different viewing angles are measured in a case of proportions of RGB being the same, by setting different proportions of the RGB, a V-T curve and an XYZ data of the WRGB at different viewing angles are simulated under the above proportions. By extracting a characteristic RGB grayscale value of an image to be improved associated with viewing angles, a performance of the characteristic RGB grayscale value at different viewing angles is simulated. The proportions of the RGB are constantly adjusted to meet specifications.