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

A gate driver including a plurality of stages of shift register units;

• wherein the shift register unit includes a signal input unit, a latch unit, a pull-down unit and a signal output unit, wherein
• the signal input unit is used for outputting a first level signal or a second level signal to a first terminal of the latch unit under the control of an input signal and a reset signal;
• the latch unit is used for latching the signal output from the signal input unit and outputting a latched processed signal to the pull-down unit;
• the pull-down unit is used for outputting the first level signal or the second level signal to the signal output unit under the control of the latched processed signal;
• and
• the signal output unit is used for receiving and inverting the signal output from the pull-down unit to generate an output signal, and outputting a signal being opposite to the output signal;
• wherein
• the pull-down unit includes a fourth thin film transistor T4 and a fifth thin film transistor T5;
• the fourth thin film transistor T4 has a drain connected to a drain of the fifth thin film transistor T5 and the signal output unit, a gate connected to a gate of the fifth thin film transistor T5 and a second terminal of the latch unit, and a source connected to a pull-down signal;
• and
• the fifth thin film transistor T5 has a source directly connected to the signal output unit and the first level signal input terminal,
• except a last stage of shift register unit, a first signal output terminal of each of other stages of shift register units is connected to an input signal input terminal of an adjacent next stage of shift register unit, that is, an output signal from the first signal output terminal of each stage of shift register unit is used as the input signal of the adjacent next stage of shift register unit;
• and
• except a first stage of shift register unit, a second signal output terminal of each of other stages of shift register units is connected to a reset signal input terminal of an adjacent previous stage of shift register unit, that is, an output signal from the second signal output terminal of each stage of shift register unit is used as the reset signal of the adjacent previous stage of shift register unit.

A display device including the gate driver;

• wherein the gate driver including a plurality of stages of shift register units;
• the shift register unit includes a signal input unit, a latch unit, a pull-down unit and a signal output unit, wherein
• the signal input unit is used for outputting a first level signal or a second level signal to a first terminal of the latch unit under the control of an input signal and a reset signal;
• the latch unit is used for latching the signal input from the signal input unit and outputting a latched processed signal to the pull-down unit;
• the pull-down unit is used for outputting the first level signal or a pull-down signal to the signal output unit under the control of the latched processed signal;
• and
• the signal output unit is used for receiving and inverting the signal output from the pull-down unit to generate an output signal, and outputting a signal being opposite to the output signal;
• wherein
• the pull-down unit includes a fourth thin film transistor T4 and a fifth thin film transistor T5;
• the fourth thin film transistor T4 has a drain connected to a drain of the fifth thin film transistor T5 and the signal output unit, a gate connected to a gate of the fifth thin film transistor T5 and a second terminal of the latch unit, and a source connected to a pull-down signal;
• and
• the fifth thin film transistor T5 has a source directly connected to the signal output unit and the first level signal input terminal,
• except a last stage of shift register unit, a first signal output terminal of each of other stages of shift register units is connected to an input signal input terminal of an adjacent next stage of shift register unit, that is, an output signal from the first signal output terminal of each stage of shift register unit is used as the input signal of the adjacent next stage of shift register unit;
• and
• except a first stage of shift register unit, a second signal output terminal of each of other stages of shift register units is connected to a reset signal input terminal of an adjacent previous stage of shift register unit, that is, an output signal from the second signal output terminal of each stage of shift register unit is used as the reset signal of the adjacent previous stage of shift register unit.