Sensor pixel, ultrasonic sensor, oled display panel, and oled display device

A sensor pixel, comprising:

• a base substrate, a piezoelectric transducer arranged on the base substrate, and a sensor pixel circuit, wherein the piezoelectric transducer is connected to a first signal input terminal and a first node, the sensor pixel circuit comprises a node control subcircuit, a drive subcircuit and a read subcircuit;
• the node control subcircuit is connected to the first node, a reset signal terminal and a second signal input terminal, and is configured to control a signal of the first node according to a signal of the reset signal terminal and a signal of the second signal input terminal;
• the drive subcircuit is connected to the first node, a power terminal and a second node, and is configured to provide a detection signal to the second node under the control of the signal of the first node;
• and
• the read subcircuit is connected to the second node, a read signal terminal and a signal read line, and is configured to provide a signal of the second node to the signal read line under the control of the read signal terminal.