A pixel scan drive circuit, configured to output a scan signal to pixel units, the pixel scan drive circuit comprising a switch unit, a pull-up output unit and a pull-down output unit, a scanning cycle in a display phase of one frame image comprising a scan signal output phase and a maintenance phase, wherein,
- in the scan signal output phase, the pull-down output unit outputs a first reference voltage in the scan signal to an output end according to a clock signal, the first reference voltage configured to control the pixel units to receive image data for image display;
- the switch unit is electrically connected to the pull-down output unit;
- in the maintenance phase, the switch unit controls the voltage of a pull-down node according to a received switch control signal, thereby controlling the pull-down output unit to stop outputting the first reference voltage according to the voltage of the pull-down node, wherein the switch control signal is an input signal of the pixel scan drive circuit;
- in the maintenance phase, the pull-up output unit outputs a second reference voltage in the scan signal, and the second reference voltage is configured to control the pixel units to stop receiving the image data;
- transistors comprised in the switch unit are of different types from transistors comprised in the pull-up output unit and the pull-down output unit,
- wherein the switch unit comprises a switch transistor, a gate of the switch transistor electrically connected to a switch control signal end to receive the switch control signal, a source of the switch transistor electrically connected to a second reference voltage end to receive the second reference voltage, a drain of the switch transistor electrically connected to a first output control unit, wherein the switch unit is configured to be switched on in the maintenance phase and transmit the second reference voltage to the first output control unit;
- wherein the switch transistor is an N-type thin-film transistor, and the switch transistor is in a conducting state under the control of a high level in the switch control signal in the maintenance phase,
- wherein the first output control unit comprises a first output control transistor, a gate of the first output control transistor electrically connected to a pull-up node, a source of the first output control transistor electrically connected to the switch unit, a drain of the first output control transistor electrically connected to the pull-down node;
- in the scan signal output phase, the first output control transistor is switched off under the control of the voltage of the pull-up node;
- in the maintenance phase, the first output control transistor is switched on under the control of the voltage of the pull-up node and transmits the second reference voltage to the pull-down node,
- wherein the pull-down node is electrically connected to the pull-up node through a second output control unit, wherein in the scan signal output phase, the pull-down output unit outputs the first reference voltage under the control of the voltage of the pull-down node, the second output control unit transmitting the second reference voltage to the pull-up node under the control of the voltage of the pull-down node, so as to enable the pull-up output unit to stop outputting the second reference voltage under the voltage of the pull-up node.