Touch Panel Electrode Line Layout for Crosstalk Reduction
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Solution Overview
Problem
Existing touch panels suffer from touch crosstalk and decreased signal-to-noise ratio due to parasitic capacitance generated between touch electrode lines and other electrodes when all electrodes are driven simultaneously.
Innovation Solution
A touch panel design where touch electrodes are driven in a time-division manner, with touch electrode lines arranged to avoid overlapping with other electrodes, reducing parasitic capacitance and crosstalk, and using different frequencies for simultaneous driving of electrodes in some embodiments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all touch electrodes are driven simultaneously, then the touch panel can detect multiple touch points at the same time, but parasitic capacitance is generated between touch electrode lines and other electrodes causing touch crosstalk and decreasing signal to noise ratio
Solution Approach 1:
The touch electrodes are divided into multiple groups (first touch electrodes and second touch electrodes) that are driven at different times. The touch panel alternates between driving the first group and the second group, preventing simultaneous activation of all electrodes. This segmentation eliminates parasitic capacitance interference while maintaining the ability to detect multiple touch points through sequential scanning.
Solution Approach 2:
The touch panel employs periodic driving of electrode groups in alternating time slots. The first touch electrodes are driven during one time slot, then the second touch electrodes are driven in the next time slot, creating a periodic pattern. This periodic action ensures that no parasitic capacitance is generated during any single driving phase while still enabling comprehensive touch detection over time.
2Object-affected harmful factors
If touch electrode lines are arranged to avoid overlapping with other electrodes, then parasitic capacitance is reduced, but the layout complexity of the touch panel increases
Solution Approach 1:
The electrode lines are segmented into first touch electrode lines connected to first touch electrodes and second touch electrode lines connected to second touch electrodes. Each set of lines is optimized independently to avoid overlapping with the corresponding electrode group during its active time slot, reducing parasitic capacitance while managing layout complexity through systematic organization.
Solution Approach 2:
The patent addresses the layout challenge by utilizing the time dimension in addition to spatial arrangement. While spatial optimization is maintained to reduce parasitic capacitance, the time-division multiplexing approach allows for more flexible routing of electrode lines without causing interference, as lines are only active during specific time slots when their corresponding electrodes are driven.
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 approach significantly reduces parasitic capacitance and improves the signal-to-noise ratio by eliminating crosstalk between touch electrodes, enhancing the performance of the touch panel.
Implementation Method 1
the touch electrode at the touched position of the touch panel has a changed capacitance
Implementation Method 2
a drive signal is applied to the touch electrode via the touch electrode line connected to the touch electrode
Implementation Method 3
a parasitic capacitance is generated between the touch electrode line and the other touch electrodes
Data Source
AI summary
A touch panel, a method for driving the touch panel and a touch display device are provided. The touch panel includes a substrate, and multiple touch electrodes and touch electrode lines located on the substrate, the touch electrodes are respectively connected to the touch electrode lines. The touch electrodes include at least a first touch electrode and a second touch electrode, and the touch electrode lines include at least a first touch electrode line and a second touch electrode line. The first touch electrode line is disposed at a position where the first touch electrode line do not overlap with a projection region of other touch electrode driven simultaneously with the first touch electrode in the direction perpendicular to the touch panel.