Shift register unit and driving method thereof, shift register and display apparatus

A shift register unit, including:

• an input terminal;
• a first output control module having a control signal output terminal connected to a pulling-up node, for pulling up a driving signal in an evaluating phase;
• a second output control module having a control signal output terminal connected to a pulling-down node, for pulling down the driving signal in a resetting phase;
• wherein the first output control module is further connected to the input terminal;
• wherein the shift register unit further includes:
• a carry signal output terminal;
• a driving signal output terminal;
• a staged output module connected to the pulling-up node, the pulling-down node, the carry signal output terminal and the driving signal output terminal, respectively, configured to a carry signal and a driving signal in stages so that the driving signal maintains a high level in the evaluating phase and a low level in the resetting phase;
• and
• a pulling-up node level maintaining module configured, in the evaluating phase, maintaining the level at the pulling-up node at a high level via the first output control module so that the driving signal maintains a high level;
• wherein the first output control module comprises a feedback signal receiving terminal;
• and
• wherein the pulling-up node level maintaining module comprises:
• a first feedback control TFT having a gate connected to the carry signal output terminal, a source connected to the feedback signal receiving terminal, and a drain connected to a first node.