Asymmetric RGB Pixel Switching for LCD Luminance Uniformity
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses face challenges in achieving uniform luminance among RGB pixels, leading to distortion in white color coordinates due to differing luminance properties of red, green, and blue pixels, which requires adjusting aperture ratios to correct color coordinates but results in reduced transmittance and display quality.
Innovation Solution
The LCD apparatus designs RGB pixels asymmetrically by shifting the switching element of the pixel with relatively low luminance to the pixel area with relatively high luminance, thereby adjusting color coordinates without decreasing the overall aperture ratio, thereby enhancing light transmittance and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aperture ratios of RGB pixels are adjusted to correct color coordinates, then white color coordinates are improved, but light transmittance and display quality deteriorate
Solution Approach 1:
The patent applies asymmetric design by positioning switching elements at different locations within the pixel area. Specifically, the switching element for the blue pixel (which has lower luminance) is positioned in the blue pixel area, while switching elements for red and green pixels are positioned in their respective areas. This asymmetric arrangement allows different aperture ratios for each pixel type, enabling correction of white color coordinates without uniformly reducing light transmittance across all pixels.
Solution Approach 2:
The patent implements local quality by allowing each pixel type to have its switching element positioned optimally for its specific luminance characteristics. The blue pixel, having lower luminance, has its switching element positioned to maximize its aperture ratio within its designated area, while red and green pixels have their switching elements positioned to optimize their respective aperture ratios. This localized optimization enables individual aperture ratio adjustment for each pixel type, achieving color coordinate correction without globally reducing transmittance.
2Manufacturing precision
If aperture ratios of RGB pixels are adjusted to correct color coordinates, then color properties are improved, but overall transmittance of RGB pixels deteriorates
Solution Approach 1:
The patent uses asymmetric switching element positioning to enable different aperture ratios for each pixel type. By positioning the blue pixel's switching element within the blue pixel area and the red/green pixel switching elements within their respective areas, the design allows the blue pixel to have a larger aperture ratio than red and green pixels. This asymmetric approach enables correction of color coordinates while maintaining or improving overall transmittance, as the blue pixel's increased aperture ratio compensates for any reductions in other pixel types.
Data Source
AI summary
Disclosed is a liquid crystal display apparatus which improves uniformity in luminance of RGB pixels by asymmetrically designing RGB pixels, and to enhances display quality, the apparatus comprises a red pixel switching element that switches a driving signal of the red pixel; a green pixel for transmitting green-colored light; a green pixel switching element that switches a driving signal of the green pixel; a blue pixel for transmitting blue-colored light; and a blue pixel switching element that switches a driving signal of the blue pixel, wherein a switching element of at least one pixel having relatively low luminance among the red pixel, green pixel and blue pixel is formed in the pixel area having relatively high luminance.