In-cell Touch Substrate Signal Synchronization via Stacked Redundant Lines
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Solution Overview
Problem
In-cell touch substrates in prior art cause non-uniform displays in display panels due to unsynchronized signals from redundant and touch signal lines, leading to issues like light leaks.
Innovation Solution
The in-cell touch substrate employs time-division multiplexed common electrodes and touch signal lines with redundant lines, where each touch electrode is connected to both touch and redundant lines through via holes in insulation layers, ensuring synchronization without additional touch chips, thus maintaining uniform display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant lines are added to the in-cell touch substrate, then signal synchronization is improved, but device complexity increases
Solution Approach 1:
The patent merges the redundant line structure with the existing touch signal line layout by stacking redundant lines directly above touch electrodes in the same layer, allowing both touch signal transmission and redundant signal paths to coexist without requiring separate routing layers or additional complex interconnections
Solution Approach 2:
The redundant lines serve multiple functions: they provide backup signal paths for reliability, enable signal synchronization across different regions of the touch substrate, and maintain structural compatibility with existing touch electrode arrangements, thereby achieving multiple objectives without proportionally increasing complexity
2Reliability
If redundant lines are stacked with different touch electrodes, then signal coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The touch substrate is segmented into multiple regions with touch electrodes and redundant lines stacked at different positions, allowing independent optimization of signal coverage in each region while maintaining a modular manufacturing approach where each segment can be processed separately
Solution Approach 2:
The patent resolves manufacturing complexity by transitioning from planar routing to three-dimensional stacking, where redundant lines are positioned vertically above touch electrodes rather than routing around them horizontally, thereby simplifying the manufacturing process while achieving comprehensive signal coverage
Data Source
AI summary
An in-cell touch substrate and a method for driving the same, and a display panel are provided. The in-cell touch substrate comprises a plurality of common electrodes time-division multiplexed as touch electrodes and a plurality of touch signal lines, each of the touch electrodes is stacked with at least one of the touch signal lines, a first insulation layer is provided between said each of the touch electrodes and the at least one of the touch signal lines, said each of the touch electrodes is electrically connected with one of the at least one of the touch signal lines through a first via hole in the first insulation layer, and is also stacked with at least one redundant line, redundant lines stacked with different touch electrodes are insulated with each other, said each of the touch electrodes is electrically connected with all of the at least one redundant line.