Hexagonal Pixel Electrodes for LCD Viewing Angle Compensation
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Solution Overview
Problem
In vertical alignment liquid crystal displays, the transition from a 4-domain to an 8-domain structure to reduce color shift results in significantly lowered overall transmittance due to non-maximum brightness of sub-domains.
Innovation Solution
A pixel structure with hexagonal sub-pixels and intersecting main electrodes that define multiple independent domains, reducing the need for thin film transistors and maintaining high transmittance by optimizing domain arrangement and electrode angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel electrode is changed from a 4-domain structure to an 8-domain structure to reduce color shift, then the color shift performance is improved, but the overall transmittance is significantly lowered
Solution Approach 1:
The pixel electrode is segmented into multiple domains (6 or 8 domains) using intersecting main electrodes and branch electrodes. This segmentation allows different viewing angle compensation in each domain while maintaining high transmittance by optimizing the electrode layout to minimize light blocking.
Solution Approach 2:
Different domains are assigned different electrode configurations and orientations to address local viewing angle requirements. Each domain has optimized electrode angles and arrangements tailored to compensate for color shift in specific viewing directions, while the overall structure maintains high transmittance.
2Ease of manufacture
If more thin film transistors are added to control multiple domains, then the viewing angle characteristics are improved, but the device complexity increases
Solution Approach 1:
Multiple domain control functions are merged into a single pixel electrode structure with intersecting main electrodes and branch electrodes. This unified structure achieves multi-domain viewing angle compensation without requiring multiple separate thin film transistors for each domain, thereby reducing device complexity.
Solution Approach 2:
The pixel electrode structure serves multiple functions simultaneously: it provides voltage distribution, domain segmentation, viewing angle compensation, and color shift correction all through a single integrated electrode system rather than requiring separate components for each function.
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 viewing angle characteristics and prevents color shift without significant deterioration in transmittance or aperture ratio, achieving better off-axis color performance.
Implementation Method 1
a long axis of liquid crystal molecules in a pixel unit is perpendicular to a filter in an uncharged state, wherein each pixel unit is divided into many domains, and in a charged state, the liquid crystal molecules in each domain are deflected in respective directions
Implementation Method 2
the VA mode has a large difference in birefringence of liquid crystal molecules at different viewing angles
Data Source
AI summary
The present invention provides a pixel structure and a liquid crystal display panel. The pixel structure includes a plurality of sub-pixels and a plurality of pixel electrodes, wherein a boundary of each of the sub-pixels has a hexagonal shape, each of the pixel electrodes includes at least three main electrodes disposed to intersect each other, all of the main electrodes intersect each other at an intersection, and the main electrodes define an area in each of the sub-pixels as a plurality of domains that are independent from each other.