Shift register unit, operation method therefor and shift register

A shift register unit, comprising:

• an input module of which a first end is connected with an input end of the shift register unit to receive an input signal from the input end, and a second end is connected with a pull-up node, and configured to transmit a received input signal to the pull-up node;
• an output module of which a first end is connected with the pull-up node, a second end is connected with a first control signal end, and a third end is connected with an output end of the shift register unit, and configured to output a first control signal of the first control signal end to the output end when a pull-up signal at the pull-up node is in effective pull-up level;
• a coupling module of which a first end is connected with a second control signal end, and a second end is connected with the pull-up node, and configured to control the pull-up signal at the pull-up node according to a second control signal of the second control signal end by way of voltage coupling;
• the coupling module is configured to make the pull-up signal at the pull-up node jump from a first coupling voltage to a second coupling voltage by way of voltage-coupling when the second control signal of the second control signal end jumps from a first level to a second level,
• wherein a period of the first control signal is a first period, and the second control signal is prolonged ¼ of the first period than an output signal at the output end of the shift register unit.