Touch Electrode Grid Layout for Lower Capacitance Overlap
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Solution Overview
Problem
Existing touch electrode structures in display panels result in increased capacitance and prolonged charging times in overlapping regions, affecting touch control sensitivity and accuracy.
Innovation Solution
A touch substrate design with first and second touch electrodes arranged in different directions, featuring conductive grids with non-overlapping edges in overlapping regions, reducing capacitance and enhancing sensitivity and accuracy by minimizing overlapping areas and charging times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch electrodes are arranged in overlapping regions to improve touch coverage, then the touch control sensitivity and accuracy deteriorate due to increased capacitance and prolonged charging times
Solution Approach 1:
The touch electrodes are divided into conductive grids with segmented structures. The first and second touch electrodes are each divided into multiple conductive grids arranged in specific patterns, allowing the overlapping region to be segmented into multiple smaller overlapping areas between adjacent grids. This segmentation reduces the total overlapping area and capacitance while maintaining comprehensive touch coverage through the distributed grid arrangement.
Solution Approach 2:
The conductive grids are designed with different local configurations in overlapping versus non-overlapping regions. In overlapping regions, the grids are positioned to minimize edge-to-edge overlap distance, reducing capacitance. The grid structures have specific edge arrangements where edges of first touch electrode grids and edges of second touch electrode grids are positioned to optimize capacitance reduction locally while maintaining overall touch functionality.
2Reliability
If the overlapping area between first and second touch electrodes is increased to improve touch detection, then the charging time increases due to increased capacitance
Solution Approach 1:
The overlapping region is segmented into multiple smaller overlapping areas between adjacent conductive grids. Each grid pair creates a localized overlapping area, and the total overlapping area is the sum of these smaller areas, which is significantly less than a continuous overlapping structure. This segmentation reduces total capacitance and charging time while maintaining touch detection capability through the distributed grid arrangement.
Solution Approach 2:
The conductive grids are designed to have partial overlap rather than complete overlap across the entire touch area. The edge-to-edge distance between grids is controlled to create minimal necessary overlap for touch detection while avoiding excessive overlap that would increase capacitance. This partial action approach achieves sufficient touch detection with reduced charging time.
Data Source
AI summary
A touch substrate, a display panel, and an electronic device are provided. The touch substrate includes a base substrate, and first touch electrodes and second touch electrodes on the base substrate; the first touch electrodes are arranged in a first direction, with each first touch electrode extending in a second direction; the second touch electrodes are arranged in the second direction, with each second touch electrode extending in the first direction, the first touch electrode and the second touch electrode are spaced apart and insulated from each other; in a direction perpendicular to the base substrate, the first touch electrodes overlap with the second touch electrodes to form overlapping regions; and in the overlapping region, any first edge extending in the first direction in the conductive grid of the firm touch electrode does not overlap with the first edge in the conductive grid of the second touch electrode.