Liquid Crystal Display Pixel Electrode Segmentation for Crosstalk Reduction
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving high contrast ratio, wide viewing angle, and fast response speed while minimizing parasitic capacitance and crosstalk due to overlapping signal lines and pixel electrodes, which deteriorate display quality.
Innovation Solution
The design includes a liquid crystal display with a specific arrangement of first and second pixel electrodes, each with stem and branch electrodes, alternately disposed and applied with different voltages, to control the electric field and reduce parasitic capacitance and crosstalk, ensuring high contrast ratio and wide viewing angle with fast response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the pixel electrode and the signal line overlap each other to increase the aperture ratio, then the aperture ratio is improved, but the parasitic capacitance between signal lines and the pixel electrode is increased such that display quality may be deteriorated by crosstalk
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode and second pixel electrode) that are spatially separated. This segmentation reduces the overlapping area between the pixel electrode and signal lines, thereby decreasing parasitic capacitance while maintaining the overall aperture ratio through optimized electrode arrangement.
Solution Approach 2:
The patent employs asymmetric positioning of the pixel electrode segments relative to the signal lines. By strategically placing the first and second pixel electrodes at different positions and orientations, the design minimizes the overlapping area with signal lines, reducing parasitic capacitance effects while preserving display area.
2Area of moving object
If the pixel electrode and the signal line overlap each other to increase the aperture ratio, then the aperture ratio is improved, but crosstalk according to coupling between neighboring pixels occurs
Solution Approach 1:
By dividing the pixel electrode into separate first and second pixel electrode segments with different orientations, the patent reduces the coupling area between neighboring pixels. This segmentation isolates the electric field distribution, minimizing capacitive coupling and crosstalk between adjacent pixels while maintaining high aperture ratio.
Solution Approach 2:
The patent introduces dimensional diversity by arranging pixel electrode segments in different orientations (e.g., horizontal and vertical arrangements). This multi-dimensional arrangement reduces the overlap area in the planar view, thereby decreasing parasitic capacitance and crosstalk between neighboring pixels while preserving the overall aperture ratio.
3Object-generated harmful factors
If a specific arrangement of pixel electrodes with stem and branch electrodes is used to reduce parasitic capacitance, then crosstalk is reduced, but the device complexity increases
Solution Approach 1:
The pixel electrode is segmented into stem and branch electrode components with simple geometric shapes. While this segmentation reduces parasitic capacitance and crosstalk, the individual segments use straightforward designs that minimize manufacturing complexity. The segmented structure achieves electrical isolation without requiring complex multi-layer or three-dimensional 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 arrangement effectively enhances the display characteristics by maintaining vertical alignment of liquid crystal molecules, improving contrast ratio, viewing angle, and response speed, while reducing crosstalk and parasitic capacitance, thus providing better image quality and side visibility.
Implementation Method 1
voltages are applied to the electric field generating electrodes to generate an electric field in the liquid crystal layer. Due to the generated electric field, liquid crystal molecules of the liquid crystal layer are aligned and polarization of incident light is controlled
Implementation Method 2
liquid crystal molecules of the liquid crystal layer are aligned and polarization of incident light is controlled, thereby displaying images
Data Source
AI summary
A liquid crystal display includes a gate line, data lines transmitting a first voltage; a transmitting line transmitting a second voltage; and pixels including first and second pixel electrodes. One pixel electrode receives the first voltage through a data line, and the other receives the second voltage through the transmitting line. Branch electrodes of the pixel electrodes alternate, and a stem of the first pixel electrode of a first pixel, faces a stem of the first pixel electrode of a second pixel and a stem of the second pixel electrode of the second pixel, with respect to the data line. Areas of the stem of the first pixel electrode of the second pixel facing the stem of the first pixel electrode of the first pixel, and of the stem of the second pixel electrode of the second pixel facing the stem of the first pixel, are the same.