Array Substrate Common Electrode Shielding for Scan Wire Crosstalk
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Solution Overview
Problem
In ultra-high definition liquid crystal displays with narrow bezels, parasitic capacitors formed between vertical scan wires and pixel electrodes cause crosstalk, affecting display quality.
Innovation Solution
The array substrate design includes a scan wiring layer with a vertical scan wire and a common electrode layer where the horizontal scan wire is spaced apart and electrically connected to the vertical scan wire, with the common electrode's projection covering the vertical scan wire's projection on the substrate, reducing parasitic capacitance and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the gate driver is integrated in a thin film flip-chip package on the display panel to reduce bezel width, then the bezel width is reduced, but parasitic capacitance between the scan wire and pixel electrode increases causing crosstalk
Solution Approach 1:
A shielding structure is introduced as an intermediary element between the scan wire and pixel electrode. This shielding structure acts as a mediator that blocks the harmful electromagnetic coupling between these two conductors, thereby reducing parasitic capacitance and crosstalk while allowing the integrated gate driver design to maintain its narrow bezel advantage
2Adaptability or versatility
If the scan wire extends vertically in the pixel to connect the gate driver, then the gate driver integration is achieved, but parasitic capacitance is formed between the scan wire and pixel
Solution Approach 1:
The shielding structure serves as a mediator that preserves the integrated gate driver design while protecting signal integrity. By positioning the shielding structure between the scan wire and pixel electrode, it mediates the electromagnetic interaction to prevent harmful coupling without disrupting the functional connectivity of the integrated driver
3Object-affected harmful factors
If the common electrode layer is positioned away from the substrate to reduce parasitic capacitance, then crosstalk is reduced, but the structural complexity increases
Solution Approach 1:
The common electrode layer is designed to serve multiple functions: it acts as both the common electrode for the liquid crystal display and as a shielding structure to reduce parasitic capacitance. This multi-functionality approach reduces structural complexity by eliminating the need for separate shielding layers while still achieving crosstalk reduction
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 minimizes parasitic capacitance between the vertical scan wire and pixel electrode, reducing crosstalk and improving display effect by shielding the pixel electrode from interference, thereby enhancing image quality.
Implementation Method 1
an orthographic projection of the common electrode on the substrate at least partially covers an orthographic projection of the vertical scan wire on the substrate
Data Source
AI summary
An array substrate and a display panel are disclosed. The array substrate includes a substrate, a scan wiring layer, and a common electrode layer. The scan wiring layer includes a vertical scan wire. The common electrode layer includes a common electrode and a horizontal scan wire. The horizontal scan wire is spaced apart from the common electrode. An orthographic projection of the common electrode on the substrate at least partially covers an orthographic projection of the vertical scan wire on the substrate.