Diagonal Sub-Pixel LCD Design for Parasitic Capacitance Neutralization
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Solution Overview
Problem
Liquid crystal displays suffer from coupling defects and stripe defects due to parasitic capacitance caused by the overlap between data lines and pixel electrodes, leading to uneven image luminance and vertical crosstalk, especially when high-speed driving methods are used.
Innovation Solution
The implementation of a liquid crystal display design featuring pixel electrodes with sub-pixel electrodes facing each other diagonally, connected through thin film transistors, and data lines that overlap these electrodes, with alternating polarity voltages applied to adjacent data lines to prevent continuous data voltage application and reduce parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If column inversion is used once per frame to minimize power consumption in high-speed driving, then power consumption is reduced, but coupling defects and stripe defects occur due to continuous data voltage application
Solution Approach 1:
The pixel electrode is divided into first and second sub-pixel electrodes that are diagonally arranged and connected to the same data line. This segmentation allows the data line to overlap both sub-pixel electrodes, creating parasitic capacitance that counteracts the coupling defect caused by continuous data voltage application during column inversion.
Solution Approach 2:
The patent converts the harmful parasitic capacitance effect (which normally causes coupling defects) into a beneficial effect. By deliberately designing the data line to overlap the pixel electrode, the parasitic capacitance is used to neutralize the coupling defect and stripe defect that occur during column inversion, thereby improving image quality while maintaining power efficiency.
2Ease of manufacture
If data lines overlap pixel electrodes to improve manufacturing simplicity, then manufacturing is easier, but parasitic capacitance causes coupling defects and stripe defects
Solution Approach 1:
The patent converts the harmful parasitic capacitance effect (which normally causes coupling defects) into a beneficial effect. By deliberately designing the data line to overlap the pixel electrode, the parasitic capacitance is used to neutralize the coupling defect and stripe defect that occur during column inversion, thereby improving image quality while maintaining manufacturing simplicity.
Solution Approach 2:
The patent applies local quality by creating a specific overlapping region between the data line and the pixel electrode. This localized overlap is designed to generate the appropriate amount of parasitic capacitance exactly where needed, rather than uniformly across the entire display, allowing precise control over the capacitance effect to counteract coupling defects.
3Speed
If pixel electrodes are connected to data lines through thin film transistors to enable high-speed driving, then driving speed is improved, but continuous data voltage application causes stripe defects
Solution Approach 1:
The pixel electrode is divided into first and second sub-pixel electrodes that are diagonally arranged. This segmentation allows the data line to overlap both sub-pixel electrodes, creating parasitic capacitance that counteracts the stripe defect caused by continuous data voltage application during column inversion in high-speed driving modes.
Solution Approach 2:
The patent converts the harmful stripe defect effect (caused by continuous data voltage application) into a beneficial outcome. The parasitic capacitance generated by the data line overlap is used to neutralize the stripe defect, allowing high-speed driving with column inversion to proceed without image uniformity issues.
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 effectively prevents coupling and stripe defects by neutralizing parasitic capacitance, ensuring consistent image luminance across the display and reducing the occurrence of vertical crosstalk, thereby enhancing the display's motion picture characteristics and power efficiency.
Implementation Method 1
a voltage is applied to the electric field generating electrodes so as to generate an electric field in the liquid crystal layer. The alignment of liquid crystal molecules of the liquid crystal layer is determined by the electric field.
Implementation Method 2
The liquid crystal displays have two display panels on which electric field generating electrodes such as pixel electrodes and a common electrode are formed, and a liquid crystal layer interposed between the panels.
Implementation Method 3
The alignment of liquid crystal molecules of the liquid crystal layer is determined by the electric field. Accordingly, the polarization of incident light is controlled, thereby providing image display.
Implementation Method 4
The liquid crystal display may further include a plurality of thin film transistors connected to the gate lines, the data lines, and the pixel electrodes.
Data Source
AI summary
A liquid crystal display includes: a plurality of pixel electrodes each having a first sub-pixel electrode and a second sub-pixel electrode that face each other in a diagonal direction; a plurality of gate lines; and a plurality of data lines that intersect the plurality of gate lines and at least partially overlap the pixel electrodes.