Fingerprint recognition driving circuit, fingerprint recognition module, touch screen, display device and fingerprint recognition driving method

A fingerprint recognition module, comprising an ultrasonic sensor and a fingerprint recognition driving circuit electrically connected to the ultrasonic sensor, wherein the fingerprint recognition driving circuit comprises:

• a first charge storing sub-circuit;
• a data acquiring sub-circuit, which is electrically connected to a first scanning signal end, an ultrasonic sensor and a first end of the first charge storing sub-circuit and is configured to write an output voltage of the ultrasonic sensor into the first end of the first charge storing sub-circuit under control of a first scanning signal received from the first scanning signal end;
• a driving sub-circuit, comprising a driving transistor having a first electrode electrically connected to the first end of the first charge storing sub-circuit;
• a second charge storing sub-circuit having a first end electrically connected to a control electrode of the driving transistor;
• a circuit compensating sub-circuit, which is electrically connected to a second scanning signal end, a second electrode of the driving transistor and the first end of the second charge storing sub-circuit and is configured to charge the second charge storing sub-circuit through the first charge storing sub-circuit and the driving transistor under control of a second scanning signal received from the second scanning signal end till a potential at the first end of the second charge storing sub-circuit equals a sum of the output voltage of the ultrasonic sensor and a threshold voltage of the driving transistor;
• and
• an output controlling sub-circuit, which is electrically connected to a control signal inputting end, the second electrode of the driving transistor and a signal reading circuit and is configured to transmit a current signal output by the driving transistor to the signal reading circuit under control of a control signal received from the control signal inputting end.

A fingerprint recognition driving method, which is applicable to a fingerprint recognition driving circuit, the fingerprint recognition driving circuit comprising:

• a first charge storing sub-circuit;
• a data acquiring sub-circuit, which is electrically connected to a first scanning signal end, an ultrasonic sensor and a first end of the first charge storing sub-circuit and is configured to write an output voltage of the ultrasonic sensor into the first end of the first charge storing sub-circuit under control of a first scanning signal received from the first scanning signal end;
• a driving sub-circuit, comprising a driving transistor having a first electrode electrically connected to the first end of the first charge storing sub-circuit;
• a second charge storing sub-circuit having a first end electrically connected to a control electrode of the driving transistor;
• a circuit compensating sub-circuit, which is electrically connected to a second scanning signal end, a second electrode of the driving transistor and the first end of the second charge storing sub-circuit and is configured to charge the second charge storing sub-circuit through the first charge storing sub-circuit and the driving transistor under control of a second scanning signal received from the second scanning signal end till a potential at the first end of the second charge storing sub-circuit equals a sum of the output voltage of the ultrasonic sensor and a threshold voltage of the driving transistor;
• and
• an output controlling sub-circuit, which is electrically connected to a control signal inputting end, the second electrode of the driving transistor and a signal reading circuit and is configured to transmit a current signal output by the driving transistor to the signal reading circuit under control of a control signal received from the control signal inputting end;
• wherein the fingerprint recognition driving method comprises:
• writing the output voltage of the ultrasonic sensor into the first end of the first charge storing sub-circuit under control of the first scanning signal;
• charging the second charge storing sub-circuit through the first charge storing sub-circuit and the driving transistor under control of the second scanning signal till the potential at the first end of the second charge storing sub-circuit equals the sum of the output voltage of the ultrasonic sensor and the threshold voltage of the driving transistor;
• and
• transmitting the current signal output by the driving transistor to the signal reading circuit under control of the control signal.