FINGERPRINT RECOGNIZING SENSOR WITH FAST RECOGNITION
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United States of America Patent
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app pub date -
May 22, 2017
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Aug 3, 2015
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Abstract
A fingerprint recognizing sensor with fast recognition, including: a substrate, a conductive plate, a passivation layer, a charging capacitor, a switch group, and an analog to digital (AD) converter; the conductive plate being arranged on the substrate; the passivation layer being arranged on the conductive pad for receiving a finger to detect a fingerprint; the switch group including a first switch and a second switch; the first switch controlling an input voltage to charge the charging capacitor; two ends of the second switch being electrically connected to the conductive plate and the first switch as well as the charging capacitor, respectively; the AD converter being electrically connected to the charging capacitor; where the second switch controls the charging capacitor to perform charge sharing for multiple times; and the AD converter outputs a fingerprint recognizing signal according to a residual voltage after the charge sharing.
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