In-Cell Touch Array Substrate Aperture Ratio Optimization
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Solution Overview
Problem
In Cell Touch Panels face challenges in integrating touch functionality with display technology, leading to reduced aperture ratio due to the need for space between touch traces and scanning lines, which increases coupling capacitance and affects display performance.
Innovation Solution
The array substrate design includes a base substrate with scanning lines, data lines, and touch electrodes, where the touch traces are connected to touch electrodes through a first insulating layer, and the first through hole is positioned between scanning lines without overlapping, allowing for improved touch precision and increased aperture ratio by avoiding parasitic capacitance and reducing the need for additional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch traces are integrated with scanning lines in In Cell Touch Panel, then manufacturing cost is reduced and module thickness is decreased, but aperture ratio decreases due to space requirements for touch traces
Solution Approach 1:
The patent merges the touch trace function with the scanning line function by making the scanning line serve dual purposes: as a display driving signal line and as a touch trace. This integration eliminates the need for separate touch trace structures, thereby maintaining aperture ratio while achieving touch functionality.
Solution Approach 2:
The scanning line is designed to perform multiple functions simultaneously: it acts as both a display scanning line for driving pixel electrodes and as a touch trace for sensing touch input. This multi-functionality resolves the contradiction by eliminating dedicated touch trace space requirements.
2Adaptability or versatility
If space is allocated for touch traces between pixel electrodes, then touch functionality is achieved, but coupling capacitance increases and affects display performance
Solution Approach 1:
The patent combines the touch trace and scanning line into a single structure, eliminating the spatial separation that causes coupling capacitance. By making the scanning line itself the touch trace, there is no additional conductive structure nearby to create parasitic capacitance effects.
Solution Approach 2:
The patent extracts the touch trace function from separate conductive structures and integrates it into the existing scanning line, removing the source of coupling capacitance while preserving touch functionality.
3Area of stationary object
If touch traces are positioned close to scanning lines to save space, then aperture ratio is improved, but parasitic capacitance increases and touch precision decreases
Solution Approach 1:
The patent merges the touch trace and scanning line into one structure, eliminating the proximity issue that causes parasitic capacitance. Since they are the same conductive structure, there is no inter-conductor capacitance to degrade touch precision.
Solution Approach 2:
The patent converts the potential harm of close spacing (parasitic capacitance) into a benefit by making the scanning line and touch trace identical structures, thereby eliminating the harmful capacitance while maintaining the space-saving advantage.
Data Source
AI summary
Provided are an array substrate, a display panel, and a display device. The array substrate includes a base substrate, scanning lines extending along first direction and data lines extending along second direction disposed on base substrate, pixel units arranged in an array along first direction and second direction; touch electrodes and touch traces disposed on base substrate, and a first insulating layer disposed between the touch traces and the touch electrodes in a direction perpendicular to base substrate. Each touch trace is connected to the touch electrodes via a first through hole in the first insulating layer. Two scanning lines are disposed between two adjacent pixel units in the second direction, and each scanning line controls its adjacent pixel unit. An orthographic projection of the first through hole on the base substrate is located between the two scanning lines and does not overlap with them.