Shift register units and driving methods, gate driving circuits and touch display devices

A shift register unit applied in a touch display device, comprising:

• a first signal input terminal, a second signal input terminal, an input and reset module, a pull-up module, a pull-down module, a pull-down control module, a clock signal input terminal, a first level input terminal, a second level input terminal, a first voltage terminal, a second voltage terminal, a signal output terminal, a discharge module and a current leakage suppression module, wherein
• the input and reset module has a first control terminal connected to the first signal input terminal, a second control terminal connected to the second signal input terminal, a first input terminal connected to the first voltage terminal, a second input terminal connected to the second voltage terminal, and an output terminal connected to a first node, wherein in a condition that the first signal input terminal receives a valid voltage signal and the second signal input terminal receives an invalid voltage signal, a connection between the first voltage terminal and the output terminal of the input and reset module is turned on, and in a condition that the first signal input terminal receives an invalid voltage signal and the second signal input terminal receives a valid voltage signal, a connection between the second voltage terminal and the output terminal of the input and reset module is turned on;
• the pull-up module has an input terminal connected to the clock signal input terminal, an output terminal connected to the signal output terminal, and a control terminal connected to the first node, wherein in a condition that the control terminal of the pull-up module receives a valid voltage signal from the first node, a connection between the input terminal of the pull-up module and the signal output terminal is turned on;
• the pull-down module has an input terminal connected to the second level input terminal, an output terminal connected to the signal output terminal, and a control terminal connected to a second node, wherein in a condition that the control terminal of the pull-down module receives a valid voltage signal from the second node, a connection between the input terminal of the pull-down module and the output terminal of the pull-down module is turned on;
• the pull-down control module has a control terminal connected to the first node, an output terminal connected to the second node, a first input terminal connected to the first level input terminal, and a second input terminal connected to the second level input terminal, wherein in a condition that the control terminal of the pull-down control module receives a valid voltage signal, a connection between the second level input terminal and the output terminal of the pull-down control module is turned on, and in a condition that the control terminal of the pull-down control module receives an invalid voltage signal, a connection between the first level input terminal and the output terminal of the pull-down control module is turned on;
• the discharge module has an output terminal connected to the first node, a control terminal connected to the second node, and an input terminal connected to an output terminal of the current leakage suppression module, wherein in a condition that the control terminal of the discharge module receives a valid voltage signal, a connection between the input terminal of the discharge module and the output terminal of the discharge module is turned on;
• and
• the current leakage suppression module has a first terminal connected to the first voltage terminal and a second terminal connected to the second voltage terminal.