Varying Touch Trace Configurations for Voltage Distribution
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Solution Overview
Problem
In in-cell touch display panels, the inconsistent number of touch traces connected to touch electrodes leads to uneven voltage distribution on the common electrode, causing issues like split screens and uneven displays due to the limited channels in driver chips and the impact on touch trace resolution.
Innovation Solution
A thin film transistor array substrate is designed with a touch function layer where the number of touch traces connected to each touch electrode and driver chip is rationally configured to ensure consistent voltage distribution, with specific arrangements of touch electrodes and traces to prevent abrupt voltage changes, such as varying the number of touch traces connected to adjacent electrodes and using dummy traces to balance voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each touch electrode is connected to the same number of touch traces, then voltage distribution consistency is improved, but the limited channels in driver chips and resolution requirements cannot be satisfied
Solution Approach 1:
The patent applies local quality by configuring different numbers of touch traces for different touch electrodes based on their specific positions and requirements. Instead of a uniform connection scheme, each touch electrode can have a customized number of touch traces (e.g., first touch electrode connected to first number of traces, second touch electrode connected to second number of traces), allowing the system to adapt to driver chip channel limitations while maintaining voltage distribution consistency through localized optimization.
2Adaptability or versatility
If the number of touch traces connected to touch electrodes varies, then driver chip channel limitations are addressed, but voltage distribution consistency deteriorates
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the number of touch traces connected to each touch electrode. The system changes the connection parameters (number of traces) based on the specific electrode's position, size, and electrical characteristics, while simultaneously adjusting other parameters such as trace width, length, or material properties to compensate for the varying numbers of connections, thereby maintaining voltage distribution consistency despite the variable trace counts.
3Power
If more touch traces are used to ensure sufficient voltage transmission, then voltage transmission capability is improved, but panel resolution is degraded
Solution Approach 1:
The patent applies segmentation by dividing the touch trace network into multiple independent trace groups that can be selectively connected to different touch electrodes. Instead of using a uniform high-number of traces for all electrodes, the system segments the traces and assigns appropriate numbers to different electrodes based on their specific voltage transmission requirements, thereby achieving sufficient power delivery without uniformly increasing the trace count across the entire panel, which would degrade resolution.
Data Source
AI summary
The present application provides a thin film transistor array substrate and a touch display panel including a plurality of touch electrodes, and the touch electrodes including a first touch electrode, a second touch electrode, and a third touch electrode arranged in a first direction. A number of touch trace electrically connected to the second touch electrode and the driver chip is greater than or equal to a number of touch trace electrically connected to the first touch electrode and the driver chip, and is less than a number of touch trace electrically connected to the third touch electrode and the driver chip.