VA LCD Sub-Pixel Electrode Layout for Afterimage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In vertical alignment liquid crystal display (VA LCD) panels, the arbitrary arrangement of liquid crystal (LC) molecules due to fringe field influence leads to collisions and undesired afterimages, which degrade display quality and viewing angle performance.
Innovation Solution
The design incorporates a thin film transistor array panel with sub-pixel electrodes connected via connection assistants, where at least one sub-pixel electrode is connected to the drain electrode, and a common electrode with circular cutouts, optimizing the electric field distribution to minimize collisions and enhance viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If cutouts and protrusions are used in field-generating electrodes to align LC molecules, then viewing angle is improved, but LC molecules in corner regions are not influenced by fringe field and arrange arbitrarily causing afterimages
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first, second, third sub-pixel electrodes) arranged in a matrix. Connection assistants are strategically placed to connect these sub-pixel electrodes, ensuring that even corner regions are influenced by the fringe field and properly aligned, preventing arbitrary LC molecule arrangement and afterimages while maintaining wide viewing angle characteristics.
Solution Approach 2:
Connection assistants serve as intermediary conductive structures that connect sub-pixel electrodes to each other and to the drain electrode. These intermediaries extend the fringe field influence to corner regions that would otherwise be excluded by the cutout structure, ensuring uniform LC molecule alignment across the entire pixel electrode area without compromising the viewing angle enhancement provided by the cutouts.
2Reliability
If connection assistants are separated from data line, then LC molecule alignment is improved, but manufacturing complexity increases
Solution Approach 1:
The connection assistants are formed in the same planar region as the data line but are electrically separated, allowing them to be manufactured using the same deposition and patterning processes. This merging of manufacturing steps reduces process complexity while maintaining the electrical separation needed for proper LC molecule alignment in corner regions.
Solution Approach 2:
The connection assistants are positioned in the planar dimension rather than being vertically stacked with the data line, allowing them to be formed simultaneously with the data line structure. This dimensional arrangement enables both structures to share manufacturing processes while maintaining functional separation for optimal LC alignment.
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 maximizes LC molecule alignment influenced by the fringe field, reducing afterimages and improving display characteristics by ensuring consistent and wide viewing angles.
Implementation Method 1
applying voltages to the field-generating electrodes to generate an electric field in the LC layer, which determines orientations of LC molecules in the LC layer to adjust polarization of incident light
Implementation Method 2
the LC molecules disposed in the corner or the connection assistants in the field-generating electrodes are not influenced by the fringe field, they are arranged in arbitrary directions
Data Source
AI summary
A panel a gate line on a first substrate, a gate insulating layer covering the gate line, a semiconductor layer on the gate insulating layer, a data line intersecting the gate line and including a source electrode and a drain electrode facing the source electrode on the semiconductor layer, a connection assistant separated from the data line, a passivation layer covering the semiconductor layer and including contact holes exposing the connection assistant and a pixel electrode including a plurality of sub-pixel electrodes and formed on the passivation layer. The sub-pixel electrodes are connected to the connection assistant through the contact holes, are electrically connected to each other through the connection assistant and at least one of the sub-pixel electrodes is electrically connected to the drain electrode.