Zigzag Slit Patterns for VA LCD Singular Point Control
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Solution Overview
Problem
Vertical alignment (VA) liquid crystal display (LCD) devices suffer from afterimages and spots due to the generation of singular points in slit portion patterns or protrusion patterns, which affect image quality and viewing angles.
Innovation Solution
A display substrate with a transparent electrode featuring slit portions that are slanted and have alternating grooves and protruding portions, forming a zigzag pattern, which controls the position of singular points to prevent afterimages and spots by enhancing or reducing electric fields uniformly across the pixel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slit portion patterns or protrusion patterns are formed on pixel electrodes and common electrodes to vertically align liquid crystal molecules, then viewing angle is improved, but afterimages and spots are generated in the patterns
Solution Approach 1:
The electrode patterns are segmented into multiple domains by forming slit portions or protrusion patterns that divide each pixel into multiple regions. This segmentation allows different liquid crystal alignment directions in different domains, improving viewing angle while the specific zigzag groove design controls singular point positions to minimize afterimages and spots
Solution Approach 2:
The invention introduces asymmetric zigzag groove patterns with alternating protruding and recessed portions that create non-uniform electric field distributions. This asymmetric design specifically positions singular points at groove locations rather than at pattern centers, reducing the generation of afterimages and spots while maintaining domain division for wide viewing angle
2Stability of the object's composition
If slit portion patterns are formed to control liquid crystal alignment, then liquid crystal molecules are vertically aligned, but singular points are generated causing spots and afterimages
Solution Approach 1:
The zigzag groove pattern acts as an intermediary structure that mediates between the electrode patterns and liquid crystal molecules. The grooves with alternating protruding and recessed portions create controlled electric field variations that guide liquid crystal alignment while positioning singular points at specific groove locations, reducing their harmful effects
Solution Approach 2:
The invention changes the geometric parameters of the slit patterns by introducing zigzag grooves with alternating protruding and recessed portions. This parameter modification shifts the singular point positions from pattern centers to groove locations, reducing the intensity and harmful effects of singular points while maintaining vertical liquid crystal alignment
3Adaptability or versatility
If protrusion patterns are formed on electrodes to divide pixels into multiple domains, then viewing angle is improved, but spots are generated when screen is rubbed
Solution Approach 1:
The electrode surface is segmented into multiple domains using protrusion patterns with alternating grooves. This segmentation creates distinct regions with different liquid crystal alignment directions, improving viewing angle while the groove structures provide stable anchor points that resist displacement from rubbing
Solution Approach 2:
The zigzag groove patterns introduce curved and angled features rather than straight linear patterns. This curvilinear design distributes stress more evenly across the pattern structure, reducing the likelihood of spot generation from mechanical rubbing while maintaining the domain division effect for wide viewing angle
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
The controlled singular points ensure uniform light blocking and prevent the formation of afterimages and spots, improving image quality and side viewing angles by maintaining a consistent arrangement of liquid crystal directors.
Implementation Method 1
A voltage is applied to each of the pixel electrodes to rearrange liquid crystal molecules, so that the transmissivity of light passing through the liquid crystal layer is controlled
Implementation Method 2
liquid crystal molecules may be vertically aligned with respect to two substrates
Data Source
AI summary
In a display substrate and a vertical alignment display panel having the same, the display panel includes an array substrate and an opposite substrate. A plurality of first slit portions are arranged through a pixel area of a common electrode on the array substrate, and the first slit portions extend in a slanted direction. A plurality of grooves and a plurality of protruding portions are alternately arranged at edges facing each other on the first slit portion, so that the first slit portions are patterned. A positive singular point is generated on a side surface of a protruding portion, and a negative singular point is generated between the positive singular points.