Touch panel control circuit and semiconductor integrated circuit using the same
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United States of America Patent
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Nov 7, 2017
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app pub date -
Dec 23, 2014
filing date -
Dec 25, 2013
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Abstract
A touch panel control circuit includes a plurality of drive circuits which are connected to Y sensor electrodes, respectively, and which apply a plurality of pulses to a corresponding Y sensor electrode for every predetermined period, and a plurality of detection circuits which are connected to X sensor electrodes, respectively. Each of the detection circuits includes a switched capacitor circuit that continues sampling of a signal from each of the X sensor electrodes, to which the detection circuits are connected, not only at a timing that is in synchronization with the plurality of pulses that are applied to the Y sensor electrodes, but also at a timing at which the pulses are not applied to the Y sensor electrodes. For example, the switched capacitor circuit is an integration circuit, or an integration circuit with a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter.
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