LCD Data Line Overlap Configuration for Cross-Talk Reduction
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with vertical cross-talk due to parasitic capacitance between data lines and pixel electrodes, which deteriorate image quality, especially during column inversion driving, and require a minimized occurrence of vertical cross-talk along with a sufficient aperture ratio.
Innovation Solution
The design includes a substrate with pixel electrodes comprising first and second sub-pixel electrodes, where the first data line does not overlap the first sub-pixel electrode but partially overlaps the second, and the second data line is adjacent without overlapping the pixel electrode, with specific geometrical configurations to minimize parasitic capacitance and optimize aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the data line is positioned to maximize aperture ratio, then the aperture ratio is improved, but parasitic capacitance increases causing vertical cross-talk
Solution Approach 1:
The data line is designed with different overlapping characteristics with different sub-pixel electrodes. Specifically, the data line partially overlaps only the second sub-pixel electrode while avoiding the first sub-pixel electrode, creating localized parasitic capacitance in a controlled manner to minimize vertical cross-talk while maintaining aperture ratio
Solution Approach 2:
The pixel electrode is divided into asymmetric first and second sub-pixel electrodes with different overlapping relationships to the data line. The first sub-pixel electrode does not overlap the data line, while the second sub-pixel electrode partially overlaps it, creating an asymmetric configuration that balances aperture ratio and reduces vertical cross-talk
2Area of stationary object
If the data line overlaps the sub-pixel electrode to maintain aperture ratio, then the aperture ratio is improved, but parasitic capacitance increases
Solution Approach 1:
The data line is designed with different overlapping characteristics with different sub-pixel electrodes. Specifically, the data line partially overlaps only the second sub-pixel electrode while avoiding the first sub-pixel electrode, creating localized parasitic capacitance in a controlled manner to minimize vertical cross-talk while maintaining aperture ratio
Solution Approach 2:
The data line is designed to partially overlap only the second sub-pixel electrode rather than fully overlapping either sub-pixel electrode. This partial action approach maintains sufficient aperture ratio while minimizing the total parasitic capacitance compared to complete overlap configurations
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 vertical cross-talk and enhances image quality by minimizing parasitic capacitance effects, thereby improving the display's luminance uniformity and aperture ratio.
Implementation Method 1
The LCD displays images by applying voltages to the electrodes to generate an electric field in the LC layer, and regulates the strength of the electric field to vary the transmittance of light passing through the LC layer
Implementation Method 2
a liquid crystal (LC) layer interposed between the panels. The LCD displays images by applying voltages to the electrodes to generate an electric field in the LC layer
Implementation Method 3
a parasitic capacitance is generated between a data line and a pixel electrode of the LCD. The parasitic capacitance affects the pixel electrode voltage by changing the voltage of a sub-pixel electrode applied with a high voltage
Data Source
AI summary
A liquid crystal display includes a substrate, a plurality of pixel electrodes formed on the substrate wherein each of the pixel electrodes includes first and second sub-pixel electrodes, and a plurality of first data lines formed on the substrate, wherein a first data line of the plurality of first data lines does not overlap a first sub-pixel electrode and partially overlaps a second sub-pixel electrode of a pixel electrode of the plurality of pixel electrodes.