Shift register unit, driving method thereof, gate driving circuit, and display device

A driving method for driving a shift register unit comprising a pull-up control module, a reset module, a pull-up module, a pull-down control module and a pull-down module, wherein:

• the pull-up control module is connected to a first voltage terminal, a signal input terminal and a pull-up node, and the pull-up control module is configured to output a voltage of the first voltage terminal to the pull-up node under control of the signal input terminal;
• the reset module is connected to a reset signal terminal, a second voltage terminal, and the pull-up node, and the reset module is configured to pull a voltage level of the pull-up node down to a voltage of the second voltage terminal under control of the reset signal;
• the pull-up module is connected to the pull-up node, a clock signal terminal and a signal output terminal, and the pull-up module is configured to output a signal of the clock signal terminal to the signal output terminal under control of the pull-up node;
• the pull-down control module is connected to the second voltage terminal, a third voltage terminal, the pull-up node and a pull-down node, and the pull-down control module is configured to pull a voltage level of the pull-down node down to the voltage of the second voltage terminal under control of the pull-up node, or the pull-down control module is configured to store a voltage of the third voltage terminal and output the voltage of the third voltage terminal to the pull-down node or release the stored voltage to the pull-down node under control of the third voltage terminal and the second voltage terminal;
• and
• the pull-down module is connected to the pull-down node, the pull-up node, the signal output terminal and the second voltage terminal, and the pull-down module is configured to pull the voltage level of the pull-up node and a voltage level of the signal output terminal down to the voltage of the second voltage terminal under control of the pull-down node, wherein the pull-down control module of the shift register unit comprises a first transistor, a first capacitor, and a second transistor, and the first transistor is a P-type Transistor, the second transistor is an N-direction transistor;
• within one image frame, the driving method comprises:
• in a first period, the pull-up control module outputting the voltage of the first voltage terminal to the pull-up node under the control of the signal input terminal to charge the pull-up node;
• in a second period, the pull-up module outputting the signal of the clock signal terminal as a gate scan signal to the signal output terminal under the control of the pull-up node;
• in a third period, the reset module pulling the voltage level of the pull-up node down to the voltage of the second voltage terminal under the control of the reset signal terminal;
• the pull-down control module storing the voltage of the third voltage terminal and outputting the voltage of the third voltage terminal to the pull-down node or releasing the stored voltage to the pull-down node under the control of the third voltage terminal and the second voltage terminal;
• the pull-down module pulling the voltage level of the pull-up node and the voltage level of the signal output terminal down to the voltage of the second voltage terminal under the control of the pull-down node;
• and
• the pull-down control module repeating the third period until a next image frame;
• and
• driving of the pull-down control module in the third stage comprises:
• the second transistor being turned off and the first transistor being turned on under the control of the pull-up node;
• and the third voltage terminal charging the pull-down node through the first transistor;
• and
• storing the voltage of the third voltage terminal into the first capacitor, and the first capacitor outputting the stored voltage to the pull-down node when the voltage of the first electrode of the first transistor is equal to that of the second electrode of the first transistor.