Asymmetric Electrode Structure for Wide Viewing Angle LCD
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Solution Overview
Problem
Traditional High Vertical Alignment (HVA) liquid crystal display panels suffer from color distortion when viewed at wide angles due to reduced aperture ratio and effective electric potential in sub-domains, leading to decreased brightness and light transmittance.
Innovation Solution
The electrode structure features intersecting trunk electrodes with branch electrodes forming varying trunk-branch angles, either decreasing or increasing from a central point, allowing for optimized electric field distribution and liquid crystal orientation, thereby improving display performance under wide viewing angles while maintaining aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pixel electrode is divided into two kinds of domains (main domains and sub domains) to solve color distortion under wide viewing angles, then color distortion is eliminated, but the aperture ratio of the panel is reduced
Solution Approach 1:
The patent applies asymmetry by making the trunk-branch angles of branch electrodes non-uniform. Specifically, the trunk-branch angles decrease gradually or increase gradually along a direction from the trunk electrode intersecting point to far therefrom, creating an asymmetric electrode structure that optimizes electric field distribution across different viewing angles without requiring domain division, thus maintaining aperture ratio while eliminating color distortion
Solution Approach 2:
The patent applies local quality by varying the trunk-branch angles of branch electrodes at different positions. The angles are adjusted locally according to their distance from the trunk electrode intersecting point, with angles decreasing or increasing gradually to create optimized electric field distribution in different regions of the pixel electrode, achieving wide viewing angle performance without reducing aperture ratio
2Object-affected harmful factors
If the pixel electrode is divided into two kinds of domains to solve color distortion under wide viewing angles, then color distortion is eliminated, but the effective electric potential of liquid crystal in sub domains is reduced
Solution Approach 1:
The asymmetric arrangement of branch electrodes with varying trunk-branch angles creates a more uniform electric field distribution across the entire pixel electrode area, eliminating the need for sub-domains with reduced effective electric potential. The gradual change in angles ensures consistent liquid crystal orientation and maintains high effective electric potential throughout
Solution Approach 2:
By adjusting the trunk-branch angles locally at different positions from the trunk electrode intersecting point, the patent optimizes the electric field strength and distribution in each region, ensuring that all areas of the liquid crystal layer receive sufficient effective electric potential for proper orientation, thereby eliminating color distortion without compromising reliability
3Object-affected harmful factors
If the pixel electrode is divided into two kinds of domains to solve color distortion under wide viewing angles, then color distortion is eliminated, but the brightness of the sub domain decreases
Solution Approach 1:
The asymmetric electrode structure with gradually varying trunk-branch angles eliminates the need for dimmer sub-domains by creating uniform electric field distribution across the entire pixel area, ensuring consistent brightness throughout the display panel while eliminating color distortion under wide viewing angles
Solution Approach 2:
The local adjustment of trunk-branch angles optimizes the electric field strength in each region of the pixel electrode, ensuring that all areas including those far from the center receive sufficient electric field strength to maintain high brightness levels, thereby eliminating color distortion without sacrificing illumination intensity
4Object-affected harmful factors
If the pixel electrode is divided into two kinds of domains to solve color distortion under wide viewing angles, then color distortion is eliminated, but the light transmittance of the panel is adversely affected
Solution Approach 1:
The asymmetric arrangement of branch electrodes with varying trunk-branch angles eliminates the need for domain division, thereby maintaining continuous light transmittance across the panel while eliminating color distortion. The gradual angle variation ensures uniform electric field distribution without creating boundaries that would affect light transmission
Solution Approach 2:
The local optimization of trunk-branch angles throughout the pixel electrode structure ensures uniform electric field distribution and consistent liquid crystal orientation across the entire panel, eliminating color distortion while maintaining high light transmittance without the need for domain boundaries that would adversely affect optical performance
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 configuration reduces color shift and enhances display performance under wide viewing angles by optimizing electric field distribution and liquid crystal orientation, while preserving the aperture ratio.
Implementation Method 1
optimized electric field distribution and liquid crystal orientation
Data Source
AI summary
An electrode structure and a liquid crystal display panel are disclosed. The electrode structure comprises a first trunk electrode and a second trunk electrode, the first trunk electrode and the second trunk electrode intersecting with each other to form a trunk electrode intersecting point; and a plurality of branch electrodes, the branch electrodes being spaced from one another, and one end of each branch electrode being connected with at least one of the first trunk electrode and the second trunk electrode and forming a trunk-branch angle with a corresponding trunk electrode. The trunk-branch angles of the branch electrodes decrease gradually or increase gradually along a direction from the trunk electrode intersecting point to far therefrom. An electric field distribution in the electrode structure can be optimized, and an orientation of liquid crystal can be optimized accordingly. Therefore, a display performance of the liquid crystal display panel under a wide viewing angle can be improved, and an aperture ratio thereof can be maintained.