Scan driving circuit, driving method, and display device

A display device, comprising a scan driving circuit, the scan driving circuit comprising a plurality of cascaded shift registers,

• wherein a shift register at each stage of the plurality of cascaded shift registers, comprising comprises:
• a first node control module;
• a second node control module;
• and
• an output control module, wherein
• the first node control module is electrically connected to an input signal terminal, a first clock signal terminal, a second clock signal terminal, a high level signal terminal, a first node, a second node and a third node, and configured to control a level at the first node based on respective levels of an input signal, a first clock signal, a second clock signal, a high level signal and the second node, wherein the first node control module comprises an input unit configured to write the input signal into the third node and a protection unit configured to control a level at a fourth node based on a level at the third node and control writing of the level at the fourth node into the first node based on the second clock signal,
• the second node control module is electrically connected to the first clock signal terminal, a low level signal terminal and the second node, and configured to control a the level at the second node based on the first clock signal and the low level signal, and
• the output control module is electrically connected to the first node, the second node, the high level signal terminal, the second clock signal terminal and a scan signal output terminal, and configured to control the scan signal output terminal to output a high level or a low level based on the level at the first node and the level at the second node.

A method for driving a shift register of a scan driving circuit, the scan driving circuit comprising a plurality of cascaded shift registers,

• wherein a shift register at each stage of the plurality of cascaded shift registers, comprising comprises:
• a first node control module;
• a second node control module;
• and
• an output control module, wherein
• the first node control module is electrically connected to an input signal terminal, a first clock signal terminal, a second clock signal terminal, a high level signal terminal, a first node, a second node and a third node, and configured to control a level at the first node based on respective levels of an input signal, a first clock signal, a second clock signal, a high level signal and the second node, wherein the first node control module comprises an input unit configured to write the input signal into the third node and a protection unit configured to control a level at a fourth node based on a level at the third node and control writing of the level at the fourth node into the first node based on the second clock signal,
• the second node control module is electrically connected to the first clock signal terminal, a low level signal terminal and the second node, and configured to control a the level at the second node based on the first clock signal and the low level signal, and
• the output control module is electrically connected to the first node, the second node, the high level signal terminal, the second clock signal terminal and a scan signal output terminal, and configured to control the scan signal output terminal to output a high level or a low level based on the level at the first node and the level at the second node,
• wherein the method comprises:
• maintaining, by the first node control module, the first node at a high level of a previous phase;
• providing, by the second node control module, a low level at the second node;
• and controlling, by the output control module, the scan signal output terminal to output a high level, in a first phase when the input signal provided by the input signal terminal is at a low level, the first clock signal provided by the first clock signal terminal is at a low level and the second clock signal provided by the second clock signal terminal is at a high level;
• providing, by the first node control module, a low level at the first node;
• providing, by the second node control module, a high level at the second node;
• and controlling, by the output control module, the scan signal output terminal to output a low level, in a second phase when the input signal provided by the input signal terminal is at a high level, the first clock signal provided by the first clock signal terminal is at a high level, and the second clock signal provided by the second clock signal terminal is at a low level;
• maintaining, by the first node control module, the first node at the low level of the second phase;
• providing, by the second node control module, a low level at the second node;
• and controlling, by the output control module, the scan signal output terminal to output a high level, in a third phase when the input signal provided by the input signal terminal is at a high level, the first clock signal provided by the first clock signal terminal is at a low level, and the second clock signal provided by the second clock signal terminal is at a high level;
• and
• providing, by the first node control module, a high level at the first node;
• maintaining, by the second node control module, the second node at the low level of the third phase;
• and controlling, by the output control module, the scan signal output terminal to output a high level, in a fourth phase when the input signal provided by the input signal terminal is at a high level, the first clock signal provided by the first clock signal terminal is at a high level, and the second clock signal provided by the second clock signal terminal is at a low level.