LCD Pixel Electrode Asymmetry for Liquid Crystal Orientation
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Solution Overview
Problem
The conventional HVA liquid crystal display (LCD) technique experiences disorderly orientation of liquid crystal molecules at the outer ends of backbone electrodes due to field pattern differences, leading to disclination and reduced display quality and transmittance.
Innovation Solution
A pixel electrode structure with perpendicularly crossing linear backbone electrodes and aligned spine electrodes, where the outer ends of the backbone electrodes are extended or indented to form auxiliary electrodes, reducing field pattern differences and aligning the liquid crystal molecules properly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer ends of backbone electrodes and spine electrodes are aligned, then the structure is simple and easy to manufacture, but the field pattern differences cause disorderly orientation of liquid crystal molecules and disclination
Solution Approach 1:
The patent applies asymmetry by intentionally misaligning the outer ends of backbone electrodes relative to spine electrodes. Specifically, the outer ends of backbone electrodes are positioned asymmetrically (extended outward or indented inward) compared to the aligned spine electrode outer ends, creating a deliberate asymmetric structure that compensates for field pattern differences and improves liquid crystal molecule orientation.
Solution Approach 2:
The patent applies local quality by making different parts of the pixel electrode structure have different characteristics. The backbone electrodes have different outer end positions compared to spine electrodes, creating localized structural variations that address specific field pattern issues in different regions of the display.
2Reliability
If the outer ends of backbone electrodes are extended outward to form auxiliary electrodes, then the field pattern differences are reduced and liquid crystal molecule orientation is improved, but the device complexity increases
Solution Approach 1:
The patent merges the auxiliary electrode function with the existing backbone electrode structure. The auxiliary electrodes are formed by extending the outer ends of backbone electrodes outward, combining the backbone electrode and auxiliary electrode into a single integrated structure rather than adding separate components, thus reducing the increase in device complexity.
Solution Approach 2:
The extended outer ends of backbone electrodes serve multiple functions: they act as both the original backbone electrode and form auxiliary electrodes that compensate for field pattern differences. This multi-functionality reduces the need for additional separate structures.
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 enhances the display quality at the outer ends of the backbone electrodes by properly orienting liquid crystal molecules, improving the overall display quality and transmittance of the LCD device.
Implementation Method 1
applying voltage to form a liquid crystal layer on the PI layer having a specific slant angle
Implementation Method 2
HVA is one types of the VA technique. It adopts photo-alignment and applying voltage to form a liquid crystal layer
Data Source
AI summary
The present invention provides a pixel electrode structure and a LCD device. The pixel electrode contains linear backbone electrodes, a first backbone electrode and a second backbone electrode, whose centers cross each other, thereby forming four display regions. Each display region is configured with a number of linear spine electrodes at intervals, and the edges of the outer ends of the spine electrodes in the same display are aligned. Yet, the edges of the outer ends of the backbone electrodes are not aligned with those of the spine electrodes. Through the present invention, the display quality at the outer ends of the backbone electrodes is enhanced.