LCD Pixel Electrode Segmentation for Wide Viewing Angles
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Solution Overview
Problem
Liquid crystal displays (LCDs) have limited viewing angles compared to cathode ray tube (CRT) displays, restricting their application in fields requiring wide viewing angles, such as aviation and medical fields, due to swirling liquid crystal vortex areas at the edges of pixel electrodes.
Innovation Solution
The liquid crystal display device is designed with a pixel structure comprising a first and second pixel region, where each pixel includes L-shaped connection portions and branch electrodes extending at predetermined angles, ensuring mirror-symmetry between adjacent pixels and rows, thereby widening the viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MVA technique is employed with vertical and horizontal bars to divide pixels into regions, then wide viewing angle is achieved, but swirling liquid crystal vortex areas are generated at edges of the bars, resulting in poor display quality
Solution Approach 1:
The pixel electrode is segmented into multiple branch electrodes (first branch electrodes and second branch electrodes) that extend in different predetermined directions and angles. This segmentation allows the liquid crystal molecules to be controlled in different regions, achieving wide viewing angle while preventing vortex formation at edges by eliminating the need for vertical and horizontal bars that create harmful swirling areas.
Solution Approach 2:
Adjacent pixels are designed with asymmetric structures that are mirror-symmetric to each other, and pixels in adjacent rows have complementary asymmetric structures. This asymmetric design prevents the formation of symmetric vortex patterns that occur in conventional designs, thereby improving display quality while maintaining wide viewing angle.
2Ease of manufacture
If conventional pixel structures are used, then manufacturing is simple, but display quality deteriorates due to vortex areas at pixel edges
Solution Approach 1:
The pixel electrode is divided into multiple branch electrodes with specific geometric configurations. This segmentation approach maintains manufacturing simplicity by using standard photolithography processes while achieving superior display quality through the optimized branch electrode structure that eliminates vortex formation.
Solution Approach 2:
Different regions of the pixel electrode are designed with different branch electrode configurations (first and second branch electrodes extending in different directions and angles). This local quality variation optimizes liquid crystal alignment in different areas, improving display quality without complicating the overall manufacturing process.
Data Source
AI summary
The present disclosure provides a liquid crystal display device including a plurality of pixels arranged in an array, each of the pixels comprising: a first pixel region and a second pixel region aligned vertically with the first pixel region. Any two adjacent pixels in the same row have structures being mirror-symmetric with respect to each other. And, for any two adjacent rows of pixels, a structure of the mth pixel in the (N+1)th row and a structure of the (m+1)th pixel in the Nth row are the same, where N and M are natural numbers.