Touch Driver Circuit Timing for Display Noise Interference
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Solution Overview
Problem
The increasing trend of electronic device thinning leads to larger coupling capacitance and mutual interference between touch and display devices, affecting display and sensing data accuracy and introducing noise signals.
Innovation Solution
A driver circuit with a timing control circuit that determines the timing of touch driving signals based on noise duration signals to prevent interference, and a touch sensing circuit that performs demodulation and filtering to improve data accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electronic device is thinned to reduce size, then the compactness is improved, but the coupling capacitance between touch and display devices increases causing mutual interference
Solution Approach 1:
The patent segments the driving waveform into distinct phases: a first waveform for driving the display device and a second waveform for driving the touch device. By separating the driving signals in time and using different waveform characteristics, the patent reduces mutual interference caused by coupling capacitance while maintaining the thinned device structure.
2Device complexity
If conventional driving waveforms are used for both display and touch devices, then the device complexity is reduced, but the sensing data accuracy deteriorates due to noise signals
Solution Approach 1:
The patent applies different waveform characteristics to different driving periods: using a first waveform type for display device driving and a second waveform type for touch device driving. This local differentiation of waveform quality allows the system to maintain simple overall structure while achieving high sensing accuracy by optimizing each driving phase independently.
Data Source
AI summary
A driver circuit, configured to drive a touch display panel, is provided. The touch display panel includes a sensor. The driver circuit includes a timing control circuit and a touch sensing circuit. The timing control circuit is configured to output a touch driving signal to the sensor. The sensor generates a sensing signal according to the touch driving signal. The touch sensing circuit is coupled to the timing control circuit and is configured to receive the sensing signal. The timing control circuit determines a timing of the touch driving signal according to a noise duration signal to drive the sensor to generate the sensing signal.