Liquid Crystal Device Slit Electrode Asymmetry
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Solution Overview
Problem
Existing liquid crystal devices suffer from reverse tilt domains due to electric field tilts in opposite directions, leading to degraded image quality, as the electric field between the common electrode and pixel electrodes results in liquid crystal molecules being oriented in opposite directions, especially around the slits of the common electrode.
Innovation Solution
The liquid crystal device incorporates a common electrode with slits having a first straight portion extending from the center of the pixel electrode to its sides and second straight portions extending outward, forming acute angles with the initial liquid crystal orientation, reducing the turning angle of liquid crystal molecules and enhancing their alignment with the electric field, thereby minimizing reverse tilt domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode has straight portions extending substantially along the initial orientation of liquid crystal molecules, then the electric field is generated between the common electrode and pixel electrodes, but reverse tilt domains occur where liquid crystal molecules are turned in opposite directions degrading image quality
Solution Approach 1:
The slit configuration changes from symmetric straight portions to an asymmetric structure with a first inclined portion and a second inclined portion having different angles. The first inclined portion forms a first angle with the initial orientation direction, while the second inclined portion forms a second angle that is different from the first angle. This asymmetric design creates a more uniform electric field distribution that prevents reverse tilt domains and improves image quality.
2Force
If the straight portion of the slit forms a small angle with the initial orientation, then the electric field is oriented perpendicular to the straight portion at the center of the pixel electrode, but this creates reverse tilt domains at the sides of the pixel electrode where the electric field tilts in the opposite direction
Solution Approach 1:
Different portions of the slit are designed with different inclination angles to address local electric field issues. The first inclined portion has a specific angle optimized for the center region of the pixel electrode, while the second inclined portion has a different angle optimized for the side regions. This local optimization ensures uniform liquid crystal molecule orientation across the entire pixel electrode area without creating reverse tilt domains.
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 the occurrence of reverse tilt domains, ensuring high-quality image display by aligning liquid crystal molecules more tightly with the electric field, even when electric fields around the pixel electrode sides are oriented oppositely, and increases the area of the common electrode's slits for better image quality.
Implementation Method 1
The pixel electrodes and the common electrode generate an electric field therebetween. The electric field turns liquid crystal molecules of the liquid crystal layer in a predetermined direction from an initial orientation
Implementation Method 2
The electric field turns liquid crystal molecules of the liquid crystal layer in a predetermined direction from an initial orientation in the regions corresponding to the slits
Data Source
AI summary
A liquid crystal device includes a liquid crystal layer between a pair of substrates. One substrate includes pixel electrodes, an insulating layer and a common electrode having a plurality of slits. An electric field between the pixel and common electrodes turns liquid crystal molecules in a predetermined direction in regions corresponding to the slits. Each slit includes a first straight portion extending from a center of the pixel electrode toward both sides of the pixel electrode and second straight portions extending from the ends of the first straight portion to the outside of the pixel electrode. The first and second portions each form an acute angle with an initial orientation of the liquid crystal molecules in a direction opposite to the predetermined direction. The acute angle between the second portions and the initial orientation is larger than the acute angle between the first portion and the initial orientation.