Shift register unit and driving method thereof, gate driving device

A method for driving a shift register unit, the method comprising:

• turning on a first input circuit according to a first input signal from a first signal input terminal to provide a first control signal from a first signal control terminal to a pull-up node, turning on a control circuit according to the first control signal and a first clock signal from a first clock signal input as terminal to provide the first input signal to the pull-up node, and turning on an output circuit according to the voltage of the pull-up node to output a second clock signal from a second clock signal input terminal to a signal output terminal;
• maintaining the voltage of the pull-up node to keep the output circuit turned on to output the second clock signal to the signal output terminal, and controlling the voltage of a pull-down node by a pull-down control circuit according to the voltage of the pull-up node;
• and
• turning on a second input circuit according to a second input signal from a second signal input terminal to provide a second control signal from a second signal control terminal to the pull-up node to turn off the output circuit, and providing the first clock signal to the pull-down node according to the first clock signal to turn on a pull-down circuit to provide the voltage of a first voltage terminal to the pull-up node and the signal output terminal.