Touch Display Substrate Electrode Grouping for Detection Speed
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Solution Overview
Problem
In capacitive touch display panels, the simultaneous detection of touch sensing electrodes leads to longer detection times for electrodes farther from the touch sensing circuit due to capacitive charging delays, resulting in idle time and reduced detection efficiency.
Innovation Solution
Grouping touch sensing electrodes into multiple groups based on their distance from the touch sensing circuit and applying touch driving signals of different frequencies to each group, ensuring signals within the same group are of the same frequency, thereby reducing detection time and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous detection of all touch sensing electrodes is performed, then detection parallelism is improved, but detection time increases for electrodes farther from the touch sensing circuit due to capacitive charging delays
Solution Approach 1:
The touch sensing electrodes are divided into multiple groups based on their distance from the touch sensing circuit. Each group is detected separately with optimized timing, allowing closer electrodes to be detected first while farther electrodes are detected later, thus reducing overall detection time while maintaining parallelism within each group.
Solution Approach 2:
The touch sensing circuit performs preliminary detection of closer electrodes before detecting farther electrodes. This sequential grouping approach ensures that capacitive charging is completed for closer electrodes before initiating detection of farther electrodes, eliminating idle time and improving overall detection efficiency.
2Area of stationary object
If touch sensing electrodes distant from the touch sensing circuit are detected, then coverage is improved, but detection speed decreases due to longer capacitive charging time
Solution Approach 1:
Electrodes are segmented into groups by distance, allowing the system to cover all electrodes while optimizing detection speed for each group. Closer electrodes are detected in faster groups, while farther electrodes are detected in later groups, maintaining overall speed while achieving full coverage.
Solution Approach 2:
The detection system changes parameters such as detection timing and signal frequency based on the distance of electrode groups from the touch sensing circuit. This adaptive parameter adjustment optimizes detection speed for electrodes at different distances while maintaining accurate detection across the entire display area.
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 allows for simultaneous detection of all touch sensing electrodes within each group, eliminating idle time and enhancing overall touch detection speed by optimizing the charging process based on electrode proximity to the touch sensing circuit.
Implementation Method 1
capacitive touch display panels
Data Source
AI summary
A touch display substrate includes a substrate including a display region and a non-display region; a touch sensing circuit in the non-display region; a plurality of touch sensing electrodes in the display region, the plurality of touch sensing electrodes grouped into at least two touch sensing electrode groups in accordance with distances from the touch sensing electrodes to the touch sensing circuit; and a plurality of touch leads, where one end of each of the touch leads is electrically connected with one of the touch sensing electrodes, and the other end of the touch lead is electrically connected with the touch control circuit. The touch sensing circuit is configured to input touch driving signals of a different frequency to each of the touch sensing electrode groups, and the touch driving signals input to the touch sensing electrodes in the same touch sensing electrode group are of the same frequency.