LCD Pixel Segmentation for Low-Gray Gamut and Wide-Angle Color
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face issues with reduced transmittance when increasing the overall color gamut of gray scales, leading to color shift and distortion at large viewing angles, and methods to enhance color gamut at low gray levels often compromise transmittance.
Innovation Solution
A liquid crystal display panel design with primary and secondary area pixel electrodes and color filter blocks, where the primary area pixel electrode operates at low gray levels and both operate at high gray levels, along with varying transmittance and area ratios of color filter blocks, to maintain high color gamut without reducing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a thickness of color filter is increased or a high color gamut color filter is adopted to improve color gamut at low gray level, then color gamut is improved, but transmittance is reduced
Solution Approach 1:
The pixel electrode is segmented into first and second area pixel electrodes, and the color filter is segmented into first and second area color filters. The first area color filter has higher color gamut characteristics while the second area color filter has higher transmittance characteristics. This segmentation allows different regions to optimize for different performance metrics simultaneously.
Solution Approach 2:
Different areas of the color filter are assigned different optical properties: the first area color filter is designed with higher color gamut characteristics for regions where color accuracy is prioritized, while the second area color filter is designed with higher transmittance characteristics for regions where brightness is prioritized. This local differentiation resolves the contradiction between color gamut and transmittance.
2Reliability
If multi domain pixel design is used to improve color shift at large viewing angle, then color shift is reduced, but device complexity increases
Solution Approach 1:
The pixel electrode is divided into first and second area pixel electrodes with different shapes and orientations, creating multiple domains within each pixel. This segmentation enables different viewing angle characteristics in different regions, reducing overall color shift without requiring complex external optical components.
Solution Approach 2:
The first area pixel electrode and second area pixel electrode are designed with asymmetric shapes and orientations. The first area pixel electrode has a shape optimized for one viewing direction while the second area pixel electrode has a shape optimized for another viewing direction. This asymmetric design reduces color shift at large viewing angles.
3Illumination intensity
If VA mode liquid crystal display is used to achieve high contrast ratio, then contrast ratio is improved, but color gamut at low gray level is reduced
Solution Approach 1:
The color filter is designed with first and second area color filters having different optical characteristics. The first area color filter is optimized for color gamut enhancement at low gray levels, while the second area color filter is optimized for transmittance. This local differentiation allows the display to maintain high contrast ratio while improving color gamut at low gray levels.
Solution Approach 2:
The invention changes the optical parameters of the color filter by creating regions with different transmittance and color gamut characteristics. By adjusting the parameters of first and second area color filters differently, the display achieves improved color gamut at low gray levels while maintaining the high contrast ratio characteristic of VA mode displays.
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
Improves color gamut at low gray levels and maintains overall transmittance, reducing color deviation at large viewing angles and enhancing picture quality.
Implementation Method 1
due to the greater difference in birefringence of liquid crystal molecules, the full wavelength transmittance characteristics of visible light at a front viewing angle and a large viewing angle are different
Implementation Method 2
the color filter layer comprises a plurality of color filter blocks arranged in an array, the color filter block comprises a primary area color filter block corresponding to the primary area pixel electrode and a secondary area color filter block corresponding to the secondary area pixel electrode
Data Source
AI summary
The present application discloses a liquid crystal display panel and a display terminal, a light transmittance of a primary area color filter block of the liquid crystal display panel is less than a light transmittance of a secondary area color filter block; when a gray level value of an image data is less than a preset value, the primary area pixel electrode is driven to display, and when the gray level value of the image data is greater than the preset value, the primary area pixel electrode and the secondary area pixel electrode are driven to display, so that the overall gray level color gamut is increased without losing the light transmittance, and the color deviation at the large viewing angle is improved.