Liquid Crystal Display Panel Slit Electrode Design
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Solution Overview
Problem
Existing vertical alignment type liquid crystal display devices suffer from color shifting at large viewing angles due to the limitations of four-domain and eight-domain designs, which affect image quality and aperture ratios.
Innovation Solution
A liquid crystal display panel design featuring sub-pixels with a circular shape and a circular pixel electrode divided by slits into multiple quadrants, allowing for more than four domains and increased liquid crystal directions, reducing the number of liquid crystals in the same direction when viewed at different angles to alleviate color shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a four-domain design is adopted in sub-pixels, then the device structure is simple, but color shifting occurs at large viewing angles
Solution Approach 1:
The pixel electrode is divided into multiple domains (more than four) by introducing additional slits (third slits) beyond the basic first and second slits. This segmentation creates more liquid crystal alignment directions, which disperses the liquid crystal orientations more effectively to reduce color shifting at large viewing angles while maintaining a manageable structure
Solution Approach 2:
The third slits are selectively arranged in specific quadrant areas (first, second, third, or fourth quadrant) of the pixel electrode based on local requirements. This allows different regions of the pixel electrode to have optimized slit configurations that adapt to local viewing angle requirements, improving overall color stability without uniformly increasing complexity across the entire electrode
2Object-affected harmful factors
If an eight-domain design is adopted in sub-pixels, then color shifting at large viewing angles is reduced, but aperture ratio decreases due to requiring three thin film transistors
Solution Approach 1:
The pixel electrode is segmented into multiple domains using slit patterns that can be configured to create more than four domains. This segmentation achieves effective color shifting reduction by creating sufficient liquid crystal alignment directions without requiring the full eight-domain complexity that would demand three thin film transistors
Solution Approach 2:
The number and arrangement of slits (first, second, and third slits) are optimized to create an intermediate domain configuration between four-domain and eight-domain designs. By adjusting the slit parameters (number, position, orientation), the patent achieves adequate color stability while maintaining a smaller number of thin film transistors, thus preserving aperture ratio
Data Source
AI summary
Embodiments of the present application provides a liquid crystal display panel and a liquid crystal display device, wherein by setting a shape of sub-pixels to a square and the shape of a pixel electrode to a circle, and by dividing the pixel electrode into a plurality of sub-pixel electrodes through a first slit, a second slit, and the plurality of third slits, a number of the direction of liquid crystal is increased when there are more than four domains in the sub-pixels. When viewing at different viewing angles, the number of liquid crystals in the same direction decrease, so that a brightness of the liquid crystal display panel is reduced, thereby alleviating the color-shift problem.