Capacitive fingerprint sensing apparatus
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United States of America Patent
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Dec 25, 2018
Grant Date -
Jul 20, 2017
app pub date -
Jan 12, 2017
filing date -
Jan 15, 2016
priority date (Note) -
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Abstract
A capacitive fingerprint sensing apparatus includes sensing electrodes, a sensing driver and a processing module. Under a first self-capacitive sensing mode, the sensing driver combines M adjacent sensing electrodes to form a first sensing electrode set to perform a first self-capacitive sensing to obtain a first self-capacitive fingerprint sensing signal; under a second self-capacitive sensing mode, the sensing driver combines N adjacent sensing electrodes to form a second sensing electrode set to perform a second self-capacitive sensing to obtain a second self-capacitive fingerprint sensing signal. M and N are positive integers larger than 1. The processing module generates a first self-capacitive fingerprint pattern and a second self-capacitive fingerprint pattern according to first self-capacitive fingerprint sensing signal and second self-capacitive fingerprint sensing signal and combines them into a third self-capacitive fingerprint pattern. The M adjacent sensing electrodes and the N adjacent sensing electrodes share at least one sensing electrode.
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