Touch Substrate Shield Electrode Crosstalk Reduction
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Solution Overview
Problem
Conventional touch substrates experience crosstalk and noise interference due to overlapping touch signal lines, which affect touch control and display quality.
Innovation Solution
Incorporating a shield electrode between touch electrodes and overlapping touch signal lines to electrically shield the touch electrodes, with the shield electrode connected to the touch electrode or ground, and operating touch electrodes and common electrodes in a time-division driving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch signal lines are routed to overlap with touch electrodes for compact layout, then device area is reduced, but crosstalk and noise interference increase
Solution Approach 1:
A shield electrode is introduced as an intermediary element positioned between the touch signal line and the touch electrode. This shield electrode acts as a mediator that blocks electromagnetic interference from the signal line from reaching the touch electrode, while allowing the compact overlapping layout to be maintained. The shield electrode is connected to ground potential to effectively sink the interference signals.
Solution Approach 2:
The shielding function is segmented into discrete shield electrodes positioned at specific locations where signal lines overlap with touch electrodes. Rather than implementing a continuous shielding layer that would increase area, the shielding is divided into localized segments only where interference occurs, maintaining compact layout while providing targeted protection.
2Measurement precision
If shield electrodes are added between touch electrodes and signal lines to reduce crosstalk, then touch signal quality is improved, but device complexity increases
Solution Approach 1:
The shield electrode is merged with existing electrode structures in the display device. The same conductive layers and manufacturing processes used for creating touch electrodes and signal lines are also used to form the shield electrodes, combining multiple functions into a unified structure that reduces overall device complexity despite adding shielding functionality.
Solution Approach 2:
The shield electrode serves multiple functions simultaneously: it provides electromagnetic shielding for touch electrodes, maintains the capacitive coupling necessary for touch sensing operation, and can be integrated with the common electrode structure. This multi-functionality reduces the need for separate dedicated shielding components.
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 reduces crosstalk and noise interference, enhancing touch signal quality and maintaining display performance by effectively isolating touch electrodes from overlapping signal lines.
Implementation Method 1
a first shield electrode positioned between the first touch electrode and the second touch signal line, and configured to electrically shield the first touch electrode from the overlapping second touch signal line
Data Source
Figure 1~2
Figure 3~4
AI summary
The present disclosure provides a touch substrate comprising a first touch electrode (1) connected to a first touch signal line (11), a first shield electrode (4) positioned between the first touch electrode (1) and a second touch signal line (12), and configured to electrically shield the first touch electrode (1) from the second touch signal line (12). The second touch signal line (12) is connected to a second touch electrode and not connected to the first touch electrode (1), and the second touch signal line (12) has a first portion which overlaps with the first touch electrode (1).