FINGERPRINT SENSING SYSTEM WITH FINGER DETECT
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United States of America Patent
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Jan 9, 2018
Grant Date -
Jan 11, 2018
app pub date -
Mar 21, 2017
filing date -
Jul 7, 2016
priority date (Note) -
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Abstract
The present invention relates to a method of sensing a fingerprint pattern of a finger using a fingerprint sensing device. The method comprising: controlling a group of sensing elements to change a potential of a group of sensing structures comprised in said group of sensing elements; acquiring, in response to said variation in potential, a response signal from a finger detecting circuitry indicative of the capacitive coupling between the group of sensing structures and the finger detecting structure; comparing a variation in the response signal with a predefined threshold value; and providing a signal indicating that a finger is present when the variation in response signal is greater than the threshold value. The invention also relates to a corresponding fingerprint sensing device.
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