Touch Control Module Driving Circuit Parasitic Capacitance
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Solution Overview
Problem
The existing built-in self-capacitive AMOLED touch control display modules are influenced by other capacitances in the circuit during the touch control time period, affecting touch control accuracy due to the manner of time division driving, where pixel display and touch control scanning are performed separately.
Innovation Solution
A driving method and circuit that synchronously provide touch control scan signals to both touch control electrodes and pixel driving circuits, including control lines and data lines, maintaining the operation states of transistors before the touch control time period, and superimposing these signals with display driving signals to minimize the impact of parasitic capacitances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If time division driving is used to perform pixel display and touch control scanning separately, then the display function and touch control function can be independently driven, but the touch control electrodes are influenced by other capacitances in the circuit during the touch control time period, affecting touch control accuracy
Solution Approach 1:
The patent merges the touch control scan signal driving with the pixel driving by simultaneously providing touch control scan signals to both the touch control electrodes and the control lines/data lines connected to pixel driving circuits during the touch control time period. This combined driving approach eliminates the harmful influence of parasitic capacitances on touch control accuracy while maintaining independent driving capability through synchronized signal provision.
2Measurement precision
If touch control scan signals are provided only to touch control electrodes during the touch control time period, then the touch control function can be performed, but other capacitances in the circuit influence the touch control electrodes, reducing measurement precision
Solution Approach 1:
The patent makes the touch control scan signals multi-functional by routing them to serve dual purposes: driving the touch control electrodes for touch sensing and simultaneously driving the control lines and data lines connected to pixel driving circuits. This universal signal provision eliminates the need for separate signaling paths, reducing device complexity while improving touch control accuracy by canceling parasitic capacitance effects.
Data Source
AI summary
The present disclosure provides a driving method of a touch control module, a drive circuit of a touch control module, a touch control module, a touch control panel and a touch control device. The driving method comprises: in a touch control time period, providing touch control scan signals to each of the plurality of touch control electrodes, and meanwhile providing respective touch control scan signals to control lines and data lines connected with each of the plurality of pixel driving circuits. Since the touch control electrodes and the pixel driving circuits are provided with touch control scan signals synchronously, the influence of other capacitances except for the touch control sensors to the touch control electrodes during touch control scan period can be released or even eliminated.