Touch Display Panel Pre-Charging for High-Rate Touch Sensing
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Solution Overview
Problem
The increasing touch sampling rate in touch display panels results in shorter charging times for touch capacitors, leading to undercharging and reduced sensitivity, affecting user experience.
Innovation Solution
Incorporating auxiliary electrodes that provide an auxiliary signal synchronized with the touch scanning signal to improve charging efficiency of touch capacitors, ensuring they reach the target value even with short charging times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch sampling rate is increased, then the touch response speed is improved, but the charging time for the touch capacitor becomes shorter causing undercharging
Solution Approach 1:
The auxiliary electrode provides an auxiliary signal in advance during the touch scanning process to pre-charge the touch capacitor, ensuring the capacitor reaches the target voltage even when the sampling rate is high and charging time is limited. This preliminary charging action prevents undercharging while maintaining high touch response speed.
Solution Approach 2:
An auxiliary electrode is introduced as an intermediary element between the touch scanning signal source and the touch capacitor. This auxiliary electrode receives the touch scanning signal and provides an additional charging path through the auxiliary signal, effectively increasing the charging current without affecting the main scanning signal integrity.
2Speed
If the touch sampling rate is increased, then the touch response speed is improved, but the touch sensitivity deteriorates due to undercharging
Solution Approach 1:
The auxiliary electrode provides preliminary charging to the touch capacitor during the scanning process, ensuring the capacitor is sufficiently charged before touch detection. This maintains touch sensitivity by preventing undercharging while preserving the high sampling rate for fast response.
Solution Approach 2:
The auxiliary electrode acts as an intermediary that supplements the charging function without interfering with the primary touch scanning operation. By providing an additional charging path, it ensures adequate capacitor charging while maintaining the high-speed scanning capability.
Data Source
AI summary
This application relates to the field of display technologies, and provides a touch display panel, a drive method, and a touch display apparatus, to improve sensitivity of touch and user experience. The touch display panel includes: a plurality of touch electrodes, where the touch electrode is configured to receive a touch scanning signal; and at least one auxiliary electrode, electrically connected to the touch electrode and configured to provide an auxiliary signal to the touch electrode when the touch electrode receives the touch scanning signal, where the auxiliary signal is the same as the touch scanning signal.