An ultrasonic signal detection circuit, comprising a control sub-circuit, a sensing sub-circuit, an output switching sub-circuit, a read signal line, and a reset sub-circuit,
- wherein the sensing, sub-circuit is configured to detect an ultrasonic echo signal and venerate a piezoelectric signal according to the ultrasonic echo signal, the piezoelectric signal comprises a first sub-signal and a second sub-signal, a voltage value of one of the first sub-signal and the second sub-signal is higher than a voltage value of a reference voltage signal, and a voltage value of the other of the first sub-signal and the second sub-signal is lower than the voltage value of the reference voltage signal;
- and
- wherein the control sub-circuit is electrically connected to the sensing sub-circuit, and is configured to:
- connect a first power terminal and an output terminal of the control sub-circuit, under control of the first sub-signal, to transmit a power signal to the output terminal of the control sub-circuit;
- and
- connect the first power terminal and the output terminal of the control sub-circuit, under control of the second sub-signal, to transmit the power signal to the output terminal of the control sub-circuit,
- wherein the piezoelectric signal is a periodic signal, the piezoelectric signal has a period that comprises a first sub-period and a second sub period, the first sub-signal corresponds to the first sub-period, and the second sub-signal corresponds to the second sub-period,
- wherein the output switching sub-circuit is electrically connected to the output terminal of the control sub-circuit and the read signal line, and is configured to connect the output terminal of the control sub-circuit and the read signal line, in the first sub period and the second sub-period, to output the power signal from the read signal line,
- wherein the reset sub-circuit is electrically connected to the control sub-circuit, and is configured to reset the control sub-circuit,
- wherein the control sub-circuit comprises a first control transistor and a second control transistor, the reset sub-circuit comprises a first reset transistor, the output terminal of the control sub-circuit comprises a second electrode of the first control transistor and a second electrode of the second control transistor,
- a first electrode of the first control transistor is electrically connected to the first power terminal to receive the power signal, the second electrode of the first control transistor is electrically connected to the output switching sub-circuit, a gate electrode of the first control transistor is electrically connected to a first electrode of the first reset transistor, and the gate electrode of the first control transistor is also electrically connected to an output terminal of the sensing sub-circuit;
- a first electrode of the second control transistor is electrically connected to the first power terminal to receive the power signal, the second electrode of the second control transistor is electrically connected to the output switching sub-circuit, a gate electrode of the second control transistor is electrically connected to the first electrode of the first reset transistor, and the gate electrode of the second control transistor is also electrically connected to the output terminal of the sensing sub-circuit;
- and
- a second electrode of the first reset transistor is electrically connected to a first reset terminal, and a gate electrode of the first reset transistor is electrically connected to a first control terminal.