LCD Pixel Asymmetry for Brightness and Color Purity
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in achieving high brightness and color purity due to the inclusion of a white sub-pixel, which reduces the area available for red, green, and blue sub-pixels, leading to decreased image quality and contrast ratio.
Innovation Solution
The LCD device is designed with a pixel configuration that includes four sub-pixels, where the white sub-pixel is smaller than the red, green, and blue sub-pixels, allowing for increased brightness while maintaining similar sizes for the latter, and the use of transparent conductive materials for common and pixel electrodes improves viewing angles and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white sub-pixel is included in the pixel configuration, then brightness is improved, but the area available for red, green, and blue sub-pixels is reduced, leading to decreased color purity and image quality
Solution Approach 1:
The patent applies asymmetry by making the white sub-pixel smaller than the red, green, and blue sub-pixels. This asymmetric size configuration allows the white sub-pixel to contribute to brightness enhancement while occupying minimal area, thereby preserving the area available for color sub-pixels and maintaining color purity and image quality.
2Illumination intensity
If the white sub-pixel area is increased to enhance brightness, then brightness is improved, but the contrast ratio between gray level and white level is deteriorated
Solution Approach 1:
The patent resolves this contradiction by implementing an asymmetric pixel configuration where the white sub-pixel is deliberately made smaller than the color sub-pixels. This asymmetric design ensures that the white sub-pixel provides sufficient brightness contribution without occupying excessive area, thereby maintaining an appropriate contrast ratio between gray and white levels.
Solution Approach 2:
The patent applies parameter changes by optimizing the area ratio between the white sub-pixel and color sub-pixels. By carefully controlling the size parameter of the white sub-pixel to be smaller than the color sub-pixels, the patent achieves a balance between brightness enhancement and contrast ratio maintenance.
3Manufacturing precision
If the white sub-pixel is made smaller to maintain color purity, then color purity is improved, but brightness enhancement is reduced
Solution Approach 1:
The patent applies asymmetry in a strategic way: the white sub-pixel is made smaller than the color sub-pixels, which preserves color purity by maintaining adequate area for color sub-pixels, while still providing sufficient brightness enhancement through the presence of the white sub-pixel, albeit in a optimized, non-dominant size.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances brightness and color purity, improving overall image quality and providing greater design flexibility for the LCD device.
Implementation Method 1
An LCD device is driven based on optical anisotropy and polarization characteristics of a liquid crystal material
Implementation Method 2
An electric field is induced between the electrodes by applying a voltage to each electrode. An alignment direction of the liquid crystal molecules changes in accordance with a variation in the intensity or the direction of the electric field
Implementation Method 3
the use of transparent conductive materials for common and pixel electrodes improves viewing angles and image quality
Data Source
AI summary
A liquid crystal display (“LCD”) device includes a white sub-pixel that has a smaller size than other sub-pixels thereby increasing the brightness and the color purities of the other colors, which improves image quality. An LCD device has the common and pixel electrodes on the same substrate and may be formed of a transparent conductive material to increase the brightness further.