Sensing method and circuit of fingerprint sensor
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United States of America Patent
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Apr 4, 2017
Grant Date -
Jun 16, 2016
app pub date -
Dec 7, 2015
filing date -
Dec 15, 2014
priority date (Note) -
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Abstract
A sensing method and circuit of fingerprint sensor is disclosed. In a first phase, the sensing method supplies a first to third voltages to an electrode plate to be measured, a read-out circuit of the electrode plate to be measured and a conductor adjacent to the electrode plate to be measured, respectively. In a second phase, the sensing method stops supplying the first to third voltages and supplies voltage to the conductor and connects the electrode plate to be measured to the read-out circuit so the read-out circuit reads out a measurement result of the electrode plate to be measured. According to the sensing method and circuit, the measurement result of the electrode plate to be measured is not affect by capacitors between the electrode plate to be measured and the conductor.
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