Capacitive fingerprint sensor
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United States of America Patent
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Jul 1, 2014
Grant Date -
Nov 28, 2013
app pub date -
Jul 24, 2012
filing date -
May 22, 2012
priority date (Note) -
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Abstract
The capacitive fingerprint sensor according to the exemplary embodiments of the present invention includes: a fingerprint sensing electrode Cfp for sensing a human fingerprint; a first transistor T1 in which the amount of currents flowing therethrough changes depending on an output voltage of the fingerprint sensing electrode Cfp; a second transistor T2 in which the amount of currents flowing therethrough changes due to a difference between the currents flowing through the first transistor T1; and a third transistor T3 which resets a gate electrode of the first transistor T1 and provides capacitive coupling with the gate electrode of the first transistor T1 via a pulse signal.
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