TOUCH SENSING CIRCUIT AND IN-CELL DISPLAY PANEL USING THE SAME
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United States of America Patent
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May 17, 2016
filing date -
May 17, 2016
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Abstract
The prevent disclosure is directed to a touching sensing circuit for an in-cell display panel. An electrode is disposed between two substrates of the in-cell display panel. An operational amplifier has a first input terminal coupled to the electrode. A signal generating circuit is coupled to a second input terminal of the operational amplifier and outputs a programmable signal during a touch sensing period. A capacitor is coupled between the first input terminal and an output terminal of the operational amplifier. A comparator has a first input terminal coupled to the output terminal of the operational amplifier, and a second input terminal coupled to a reference voltage. A feedback circuit is coupled between the output terminal of the comparator and the first input terminal of the operational amplifier. The programmable signal does not have a square waveform, and no switch is disposed between the operational amplifier and the electrode.
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