VA LCD Panel Electrode Segmentation for Side View Washout
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Solution Overview
Problem
Conventional VA LCD panels suffer from a washout problem at side views, resulting in inferior display quality compared to FFS and IPS panels, due to their alignment technology and electrode design.
Innovation Solution
The design includes a display panel with a first and second substrate, a display medium layer, and electrodes with specific alignment areas and branch electrodes, where the alignment direction of one area is opposite to the other, and the included angle between the extending direction of the branch electrodes and the alignment direction is between 50° and 80°, improving the side view characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photo-alignment technology is used to control alignment direction of LC molecules in VA LCD panel, then contrast ratio and response time are improved, but side view display quality deteriorates due to washout effect
Solution Approach 1:
The pixel electrode is segmented into multiple regions with different electrode extending directions. Each region has electrodes extending in a specific direction (first direction, second direction, third direction, or fourth direction), creating distinct alignment domains that control LC molecule orientation differently, thereby improving side view display quality while maintaining high contrast ratio
Solution Approach 2:
The patent introduces asymmetric electrode configurations where electrodes in different regions extend in different directions rather than uniformly. This asymmetric design creates varied electric field distributions that prevent the washout effect at side views while preserving the high contrast ratio characteristic of VA LCD panels
2Duration of action of moving object
If four-domain alignment is implemented in VA LCD panel, then response time is reduced, but side view gamma curves show serious washout problem
Solution Approach 1:
The pixel electrode is divided into multiple regions with electrodes extending in different directions (first, second, third, and fourth directions). This segmentation creates multiple alignment domains that maintain fast response characteristics while improving side view gamma uniformity by distributing the alignment stress across different directions
Solution Approach 2:
The patent extends the alignment control from a single-plane approach to a multi-dimensional approach by introducing electrodes extending in four different directions within the pixel electrode plane. This dimensional expansion allows better control over LC molecule orientation from multiple angles, improving side view performance while maintaining fast response time
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 side view effect of the display panel, making it comparable to FFS or IPS panels in terms of display quality by reducing the washout issue and improving transmittance.
Implementation Method 1
the manufacturer of the display device has utilized the photo-alignment technology to control the alignment direction of the LC molecules
Implementation Method 2
the LC molecules in the pixel can be oriented towards, for example, four different directions
Data Source
AI summary
A display panel comprises a first electrode on the first substrate and a first alignment layer on the first electrode. The first alignment layer is disposed on the first electrode and comprises a first alignment area and a second alignment area. An alignment direction of the first alignment area is opposite to an alignment direction of the second alignment area. The first electrode is disposed in the first alignment area and comprises a first trunk electrode and at least two first branch electrodes respectively connected to two sides of the first trunk electrode. At least one of the first branch electrodes comprises a first distal end and a first connection end connected to the first trunk electrode. An included angle between the extending direction from the first distal end to the first connection end and the alignment direction of the first alignment area is between 50° and 80°.