Pixel Electrode with Dual Sealing Frames for LCD View Angle
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Solution Overview
Problem
Conventional VA-type LCD panels suffer from color shift and dark patterns at large view angles due to irregular electrical fields at the edges of the pixel electrode, leading to reduced optical transmission and display quality.
Innovation Solution
A pixel electrode design featuring a 'cross' shaped trunk with pixel electrode branches extending at 45°, 135°, and -135° angles, accompanied by first and second enclosure frames that form additional liquid crystal domains, ensuring regular and uniform electric fields and eliminating dark patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a star-like or double-cross pattern pixel electrode is used to achieve multi-liquid crystal domain vertical alignment, then view angle and color shift performance are improved, but irregular electrical fields at the edges cause dark patterns and reduced optical transmission
Solution Approach 1:
The pixel electrode is divided into multiple branches extending from a central trunk, with each branch forming distinct liquid crystal domains. This segmentation allows different regions to control liquid crystal orientation in different directions, improving view angle performance while the structured branches prevent random edge fields that cause dark patterns
Solution Approach 2:
Different regions of the pixel electrode are designed with specific local structures - the trunk provides central control while branches extend in specific directions (45°, 135°, -135°, -45°) to create localized electrical fields that control liquid crystal orientation in corresponding domains, eliminating dark patterns at edges
2Adaptability or versatility
If a star-like or double-cross pattern pixel electrode is used to achieve multi-liquid crystal domain vertical alignment, then color shift is reduced, but optical transmission at edges deteriorates due to random electrical field directions
Solution Approach 1:
The pixel electrode is segmented into multiple directional branches that create distinct liquid crystal domains, allowing controlled electrical fields in each region while maintaining overall color shift performance through the multi-domain structure
Solution Approach 2:
The invention converts the potential harm of edge effects into a benefit by designing branches that extend to edges in specific directions, creating controlled electrical fields that improve liquid crystal orientation rather than causing random orientation and dark patterns
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 design enhances optical transmission and view angles by orienting liquid crystal molecules consistently, eliminating dark patterns and improving display quality at low grey levels.
Implementation Method 1
the pixel electrode 70 comprises a trunk 701 in a 'cross' form and multiple strip likes pixel electrode branches 702 that extend from the 'cross' shaped trunk 701 at angles that are respectively 45°, 135°, -135°, and -45° with respect to the horizontal direction. Every two adjacent ones of the strip pixel electrode branches 702 extending in the same direction define therebetween a void slit. Such a star like or double cross pattern of the pixel electrode 70 generates inclining electrical fields that conduct liquid crystal molecules in different ones of the liquid crystal domains to incline or tilt toward different directions
Implementation Method 2
The VA type LCD panel involves liquid crystal that rotate vertically and thus, a relatively large difference is present in birefringence of the liquid crystal molecules, which leads to an issue of color shift at a large view angle
Data Source
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AI summary
A pixel electrode (1) and a liquid crystal display panel; the pixel electrode (1) is provided with a first sealing frame (15) which connects a trunk (11) and ends of all pixel electrode branches (13), and at least one second sealing frame (17) sleeved on the periphery of the first sealing frame (15) and connected to the trunk (11); by means of the first sealing frame (15) and the second sealing frame (17), an electric field at the edge of the pixel electrode (1) is regularized, thus orientation of liquid crystal molecules located at the edge of a sub-pixel is relatively uniform, which may eliminate dark lines at the edges all around the sub-pixels and improve optical transmittance of the liquid crystal display panel; in addition, a new domain is formed between the first sealing frame (15) and the second sealing frame (17), which may further improve the viewing angle of the liquid crystal display panel at low and medium gray levels.