Array Substrate Symmetrical Pixel Design for Crosstalk Reduction
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Solution Overview
Problem
In TFT-LCDs, the displacement of data lines during manufacturing can lead to increased parasitic capacitance and vertical crosstalk, causing flicker and uneven liquid crystal voltages due to the influence of signal lines on pixel electrodes, resulting in reduced image quality and resolution.
Innovation Solution
The array substrate is designed with each pixel unit comprising two sub-pixel units, where the data line is formed between them, and connected to the source electrodes of both sub-pixel units, allowing for symmetrical coupling capacitances and self-compensation of parasitic capacitances, thereby minimizing the impact of data line displacement on liquid crystal voltages and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel unit size is reduced to achieve higher resolution, then the image quality and resolution are improved, but the influence of signal lines on pixel electrodes increases causing vertical crosstalk and flicker
Solution Approach 1:
The pixel unit is divided into two sub-pixel units (first and second sub-pixel units) positioned on opposite sides of the data line. This segmentation allows the data line to be centrally located, creating symmetrical coupling capacitances that compensate for each other, thereby reducing the harmful influence of signal lines on pixel electrodes while maintaining high resolution
Solution Approach 2:
The invention intentionally creates a symmetrical structure (which is a form of controlled asymmetry relative to conventional designs) by positioning sub-pixel units equidistantly on both sides of the data line. This symmetrical arrangement ensures that coupling capacitances are equal, allowing self-compensation of parasitic effects and eliminating vertical crosstalk
2Ease of manufacture
If the data line is horizontally displaced during manufacturing, then the exposing process flexibility is improved, but the coupling capacitance difference between adjacent pixel units increases causing vertical crosstalk
Solution Approach 1:
The symmetrical structure is designed in advance to preemptively counteract the harmful effects of data line displacement. By positioning sub-pixel units symmetrically on both sides of the data line, the design ensures that any horizontal displacement will result in equal changes in coupling capacitance for adjacent pixel units, causing the changes to compensate each other and maintain voltage uniformity
Solution Approach 2:
The invention changes the structural parameters by dividing pixel units and positioning them symmetrically around the data line, rather than placing the data line at the edge as in conventional designs. This parameter change makes the system insensitive to horizontal displacement, as the symmetrical geometry ensures that coupling capacitance differences remain balanced even when the data line position varies
3Manufacturing precision
If the data line is horizontally displaced, then the manufacturing process tolerance is improved, but the parasitic capacitance between gate electrodes and source electrodes increases causing feed-in voltage changes and flicker
Solution Approach 1:
Dividing the pixel unit into two sub-pixel units with the data line positioned between them creates a symmetrical structure that balances parasitic capacitance effects. This segmentation ensures that any displacement-induced changes in parasitic capacitance are equally distributed and compensate each other, preventing flicker
Solution Approach 2:
The invention converts the potentially harmful effect of data line displacement into a beneficial self-compensation mechanism. By positioning sub-pixel units symmetrically, the displacement causes equal changes in coupling capacitances that offset each other, transforming what would be a source of vertical crosstalk into a balanced system that maintains voltage uniformity
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 ensures uniform liquid crystal voltages across the array substrate, reduces the influence of data line displacement on pixel units, and suppresses the flicker phenomenon, maintaining high image quality and resolution.
Implementation Method 1
the coupling capacitances generated due to data lines in two pixel units adjacent to the displaced data line becomes larger... an overlapping portion of the pixel electrode 11 and a common electrode line 12 forms a storage capacitance Cb, and an overlapping portion of the gate electrode 3 and the source electrode 7 forms a parasitic capacitance Cgs
Data Source
AI summary
An embodiment of the disclosed technology provides an array substrate, comprising a base substrate, and data lines and gate lines crossed with each other to define a plurality of pixel units on the base substrate, wherein each pixel unit comprises two sub-pixel units, and the data line for the pixel unit is formed between the two sub-pixel units, and each of the two the sub-pixel units comprises a pixel electrode and a thin film transistor (TFT), which comprises a gate electrode, a source electrode, a drain electrode and an active layer.