LCD Sub-Pixel Electrode Asymmetry for Viewing Angle
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Solution Overview
Problem
Conventional liquid crystal displays face challenges in achieving improved viewing angles and display quality due to texture defects caused by fringe fields and misalignment of liquid crystal molecules, particularly when using pixel electrodes with slits and common electrodes.
Innovation Solution
The liquid crystal display incorporates a pixel design with first and second sub-pixels charged with different voltages, featuring unique electrode structures with trunk and branch portions to align liquid crystal molecules differently across domains, reducing texture defects and enhancing optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel electrodes with slits and common electrodes are used, then the liquid crystal display can be manufactured with conventional structures, but texture defects occur due to fringe fields and misalignment of liquid crystal molecules
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode) with different voltage levels. Each sub-pixel electrode has a specific pattern of trunk portions and branch portions that create controlled fringe fields in different regions, allowing precise alignment of liquid crystal molecules without the defects associated with conventional slit structures.
Solution Approach 2:
Different regions of the pixel electrode are designed with different structures: trunk portions extend in first and second directions to align liquid crystal molecules in those directions, while branch portions extend in a third direction to align molecules in the third direction. This local variation in electrode structure creates region-specific alignment that prevents texture defects while maintaining conventional manufacturability.
2Device complexity
If conventional pixel electrodes are used, then the device structure is simple, but the viewing angle is limited and display quality is reduced
Solution Approach 1:
The pixel electrode structure is extended into multiple dimensions by creating trunk portions that extend in first and second directions, and branch portions that extend in a third direction. This multi-directional extension creates three-dimensional fringe field patterns that align liquid crystal molecules in multiple orientations, thereby expanding the viewing angle without significantly increasing device complexity.
Solution Approach 2:
The first sub-pixel electrode and second sub-pixel electrode are designed with asymmetric structures relative to each other, with different patterns of trunk and branch portions. This asymmetry creates complementary fringe field patterns that together provide omnidirectional liquid crystal alignment, improving viewing angle and display quality while maintaining reasonable structural simplicity.
3Reliability
If sub-pixel electrodes with multiple branch portions are used, then liquid crystal molecule alignment is improved and texture defects are reduced, but the electrode structure becomes more complex
Solution Approach 1:
The pixel electrode is segmented into sub-pixel electrodes with distinct trunk portions and branch portions. Each trunk portion has branch portions extending from its ends, creating a hierarchical segmented structure. This segmentation allows independent optimization of alignment in different regions while maintaining an organized, manufacturable pattern that doesn't excessively increase device complexity.
Solution Approach 2:
The trunk portions and branch portions are merged into integrated electrode structures where the branch portions extend from the trunk portions. This merging creates unified fringe field patterns that simultaneously achieve multi-directional liquid crystal alignment without requiring separate electrode elements, thereby improving molecule alignment while controlling device complexity.
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 improves display quality by preventing texture defects and increasing transmittance between sub-pixel electrodes, thereby expanding the viewing angle and enhancing the overall visibility of the liquid crystal display.
Implementation Method 1
a pixel electrode that includes a first sub-pixel electrode in the first sub-pixel and a second sub-pixel electrode in the second sub-pixel
Implementation Method 2
drives liquid crystal molecules of the liquid crystal layer and controls a transmittance of light passing through the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes a pixel that includes a first sub-pixel chargeable with a first voltage and a second sub-pixel chargeable with a second voltage different from the first voltage, a pixel electrode that includes a first sub-pixel electrode in the first sub-pixel and a second sub-pixel electrode in the second sub-pixel, a common electrode that faces the pixel electrode, and a liquid crystal layer between the pixel electrode and the common electrode. The first sub-pixel electrode includes a first trunk portion and a plurality of first branch portions protruding from and extending from one side of the first trunk portion. The second sub-pixel electrode includes a second trunk portion and a plurality of second and third branch portions that protrude from both sides of the second trunk portion and extend substantially parallel to the first branch portions.