Ultrasonic fingerprint detection sensor and fingerprint detection method

• Main Authors: PAN SHENGYING, CHENG TAIYI, XIAO YEHUI
• Format: Patent
• Language: Chinese; English
• Published: 12.05.2020
• Subjects: CALCULATING; COMPUTING; COUNTING; HANDLING RECORD CARRIERS; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS

The invention provides an ultrasonic fingerprint detection sensor and a fingerprint detection method. The ultrasonic fingerprint detection sensor comprises a glass substrate; a ultrasonic pixel arrayarranged on the glass substrate and comprising a ultrasonic pixel unit, wherein each ultrasonic pixel unit comprises an ultrasonic sensor and an ultrasonic fingerprint detection circuit connected withthe ultrasonic sensor; the ultrasonic fingerprint detection circuit comprises a first MOS transistor, a second MOS transistor and a third MOS transistor and receives at least three corresponding sequential control signals; the first MOS transistor stores a fingerprint peak signal output by the ultrasonic sensor in a first preset time interval under the at least three sequential control signals; the second MOS transistor outputs a fingerprint peak signal in a second preset time interval; and the third MOS transistor resets the gate signal of the first MOS transistor in a third preset time interval, and raises the DC po