Balanced Capacitance in VA-Mode LCD Sub-Pixel Electrodes
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Solution Overview
Problem
Vertical alignment (VA)-mode liquid crystal display (LCD) devices suffer from poorer side visibility due to differences in capacitance between data lines and sub-pixel electrodes, leading to deteriorated display quality.
Innovation Solution
The LCD device design includes first and second data lines with corresponding thin-film transistors (TFTs) and sub-pixel electrodes, where the overlapping areas between the electrodes and data lines are equal, ensuring balanced capacitance and controlled electric field intensities in field control areas, thereby minimizing capacitance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two sub-pixel electrodes are provided with voltages by different data lines to control electric field intensity differently in each sub-pixel, then side visibility is improved, but capacitance differences between data lines and sub-pixel electrodes cause display quality deterioration
Solution Approach 1:
The patent applies local quality by creating different overlapping area configurations for different sub-pixel electrodes. Specifically, the first sub-pixel electrode has a first overlapping area with the first data line, while the second sub-pixel electrode has a second overlapping area with the second data line. By locally adjusting these overlapping areas, the patent balances the capacitance values between the data lines and sub-pixel electrodes, thereby resolving the display quality deterioration while maintaining improved side visibility.
2Reliability
If overlapping areas between sub-pixel electrodes and data lines are made equal to balance capacitance, then display quality is improved, but side visibility improvement is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the overlapping area parameters between data lines and sub-pixel electrodes. The first overlapping area and second overlapping area are designed to be equal, which balances the capacitance parameters. This parameter optimization allows the system to achieve both improved display quality and maintained side visibility performance.
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 visibility of VA-mode LCD devices by maintaining consistent capacitance between data lines and sub-pixel electrodes, reducing the difference in brightness when viewed from the front and side, thus improving overall display quality.
Implementation Method 1
The LCD device generates an electric field in the liquid crystal layer by applying voltages to the field-generating electrodes so as to determine the orientation of liquid crystal molecules in the liquid crystal layer
Implementation Method 2
displays an image by controlling the polarization of light incident thereupon using the electric field
Implementation Method 3
a pair of data lines that respectively provide voltages to a pair of sub-pixel electrodes of a pixel may form different capacitances with the pair of sub-pixel electrodes of the pixel
Data Source
AI summary
A liquid crystal display device is provided. According to an exemplary embodiment of the present disclosure, a liquid crystal display (LCD) device may comprise: a substrate; first and second data lines extending in parallel to each other over the substrate; a first thin-film transistor (TFT) disposed on the substrate and connected to the first data line; a second TFT disposed on the substrate and connected to the second data line; a first sub-pixel electrode disposed to overlap the first and second data lines and connected to the first TFT; and a second sub-pixel electrode disposed to overlap the first and second data lines and connected to the second TFT, wherein an overlapping area of the first sub-pixel electrode and the first data line is the same as an overlapping area of the first sub-pixel electrode and the second data line.