Ultrasonic fingerprint recognition method, device and system, display device and storage medium

An ultrasonic fingerprint recognition method, comprising:

• providing an ultrasonic fingerprint recognition module comprising a plurality of sensing units distributed in array, the plurality of sensing units comprising:
• a receiving electrode layer having a plurality of receiving electrodes distributed in array;
• a piezoelectric material layer disposed on a side of the receiving electrode layer;
• an emission electrode layer disposed on a side of the piezoelectric material layer distal to the receiving electrode layer, and comprising a plurality of rows of emission electrodes;
• a selection circuit having an input terminal which is connected with an excitation signal and an output terminal which is connected with the emission electrode for selecting to transmit the excitation signal to the plurality of emission electrodes;
• and
• a pixel receiving circuit connected to the receiving electrode layer that receives a fingerprint signal;
• emitting ultrasonic waves by a scanning line in a row focused manner, the scanning line comprising a plurality of sensor units comprising a row of emission electrode and a plurality of receiving electrodes corresponding to the row of emission electrode;
• and
• receiving and recognizing the ultrasonic waves emitted by the scanning line in a column focused manner, wherein receiving and recognizing the ultrasonic waves emitted by the scanning line in the column focused manner comprises:
• obtaining a first fingerprint signal received by each of the sensing units in the scanning line;
• separating an interference fingerprint signal from the first fingerprint signal of a target sensing unit according to the plurality of first fingerprint signals and a positional relationship between the target sensing unit and the remaining sensing units, to obtain a second fingerprint signal, wherein the target sensing unit is any of the sensing units in the scanning line, the remaining sensing units are sensing units other than the target sensing unit in the scanning line, and the interference fingerprint signal is a fingerprint signal transmitted to the target sensing unit from fingerprint areas corresponding to the remaining sensing units;
• and
• performing fingerprint recognition according to the second fingerprint signals received by the plurality of sensing units.

An ultrasonic fingerprint recognition system, comprising:

• an ultrasonic fingerprint recognition circuit comprising a plurality of sensing units distributed in array, wherein the plurality of sensing units comprise:
• a receiving electrode layer having a plurality of receiving electrodes distributed in array;
• a piezoelectric material layer disposed on a side of the receiving electrode layer;
• an emission electrode layer disposed on a side of the piezoelectric material layer distal to the receiving electrode layer, and comprising a plurality of rows of emission electrodes;
• a selection circuit having an input terminal which is connected with an excitation signal and an output terminal which is connected with the emission electrode for selecting to transmit the excitation signal to the plurality of emission electrodes;
• and
• a pixel receiving circuit connected to the receiving electrode layer that receives a fingerprint signal;
• an obtaining circuit connected to the ultrasonic fingerprint recognition module and configured to obtain a first fingerprint signal received by each of the sensing units in a scanning line;
• a separation circuit connected to the obtaining circuit and configured to, according to the plurality of first fingerprint signals and a positional relationship between a target sensing unit and the remaining sensing units, separate an interference fingerprint signal from the first fingerprint signal of the target sensing unit to obtain a second fingerprint signal, wherein the target sensing unit is any of the sensing units in the scanning line, the remaining sensing units are sensing units other than the target sensing unit in the scanning line, and the interference fingerprint signal is a fingerprint signal transmitted to the target sensing unit from fingerprint areas corresponding to the remaining sensing units;
• and
• a recognition circuit connected to the separation circuit and configured to perform fingerprint recognition according to the second fingerprint signals received by the plurality of sensing units.