VA Array Substrate Electrode Layout for Wide Viewing Angles
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Solution Overview
Problem
Existing VA liquid crystal display devices face the challenge of not being able to simultaneously achieve a wide viewing angle and a high aperture ratio.
Innovation Solution
The array substrate design includes a pixel electrode layer with main electrodes aligned in different directions and branch electrodes with varying widths and slits, creating regions with different electric field intensities to achieve distinct liquid crystal deflection angles, mimicking an 8-domain effect in a 4-domain structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an 8-domain design is employed to increase viewing angle, then the viewing angle is improved, but the aperture ratio deteriorates
Solution Approach 1:
The pixel electrode is segmented into multiple main electrodes (first main electrode and second main electrode) aligned in different directions, with branch electrodes extending from them. This segmentation creates multiple electric field regions without requiring multiple transistors, thus achieving wide viewing angle while maintaining high aperture ratio.
Solution Approach 2:
Different regions of the pixel electrode are designed with different properties: the first main electrode and its branch electrodes create electric fields in one direction, while the second main electrode and its branch electrodes create electric fields in another direction. This local quality variation enables different liquid crystal deflection angles in different regions, achieving wide viewing angle without compromising aperture ratio.
2Adaptability or versatility
If an 8-domain design is employed to increase viewing angle, then the viewing angle is improved, but the transmittance deteriorates
Solution Approach 1:
The pixel electrode is segmented into multiple main electrodes and branch electrodes with varying widths, creating multiple electric field regions. This segmentation allows different gray scale control in different regions, achieving wide viewing angle while maintaining high transmittance through optimized electric field distribution.
Solution Approach 2:
The width of branch electrodes is designed to gradually decrease from the connection with main electrodes outward, and the widths of first and second main electrodes are set differently. These parameter changes create distinct electric field intensities in different regions, enabling wide viewing angle with maintained transmittance through optimized voltage division.
3Area of stationary object
If a 4-domain design is employed to increase aperture ratio, then the aperture ratio is improved, but the viewing angle deteriorates
Solution Approach 1:
Within the 4-domain structure, local quality is varied by introducing main electrodes in different alignment directions (first and second main electrodes) and branch electrodes with gradually decreasing widths. This creates multiple electric field regions with different characteristics, achieving wide viewing angle while maintaining the high aperture ratio of the 4-domain design.
Solution Approach 2:
The first main electrode and second main electrode are designed with different widths, and branch electrodes have asymmetric width variations. This asymmetry creates different electric field intensities in different regions, enabling the 4-domain structure to achieve wide viewing angle comparable to 8-domain designs while maintaining high aperture ratio.
4Area of stationary object
If a 4-domain design is employed to increase aperture ratio, then the aperture ratio is improved, but the transmittance at high gray scale deteriorates
Solution Approach 1:
The widths of main electrodes and branch electrodes are optimized with specific parameter variations (first main electrode width different from second, branch electrode width gradually decreasing). These parameter changes create optimized electric field distribution that enables high transmittance at high gray scales while maintaining the high aperture ratio of the 4-domain design.
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 the viewing angle at low gray scales while maintaining high transmittance at high gray scales, thus balancing wide viewing angles with high aperture ratios.
Implementation Method 1
at least one region having different electric field intensities at various positions thereof is presented in the array substrate, which therefore causes the deflection angle of the liquid crystal distinctive at various positions of the at least one region
Data Source
AI summary
Array substrates and display panels are provided in the present application provides. By the gradually decreased width of at least one portion of the branch electrodes in the array substrate along the direction from a position near a connection between the branch electrodes and the main electrode to a position away from the connection between the branch electrodes and the main electrodes, at least one region having different electric field intensities at various positions thereof is presented in the array substrate, which therefore causes the deflection angle of the liquid crystal distinctive at various positions of the at least one region. Consequently, a viewing angle effect from 8-domain can be achieved based on a 4-domain design, providing a display effect with a wide viewing angle at a low gray scale and a high transmittance at a high gray scale and compromising the wide viewing angle with a high aperture ratio.