Shift register and driving method thereof, gate driving circuit

1. A shift register, comprising:

an input sub-circuit, a first reset sub-circuit, an output sub-circuit, a pull-down sub-circuit, a pull-down control sub-circuit and a second reset sub-circuit, wherein

the input sub-circuit is configured to, under control of a signal input terminal, provide a signal of a first voltage source to a pull-up node and a first node respectively;

the first reset sub-circuit is configured to, under control of a reset terminal, provide a signal of a second voltage source to the pull-up node and the first node respectively;

the output sub-circuit is configured to, according to a level of the pull-up node, output a signal of a clock signal terminal to a signal output terminal;

the pull-down control sub-circuit is configured to, according to the level of the pull-up node and a signal of a third voltage source, control a level of a pull-down node;

the pull-down sub-circuit is configured to, according to a level of the first node, output a level of a fourth voltage source to the pull-down node, and, according to the level of the pull-down node, output the level of the fourth voltage source to the pull-up node and the signal output terminal; and

the second reset sub-circuit is configured to, under control of a total reset terminal, reset the pull-up node and the signal output terminal.

2. The shift register according to claim 1 , wherein the input sub-circuit comprises: a first transistor and a second transistor,

a control electrode of the first transistor is connected with the signal input terminal, a first electrode of the first transistor is connected with the first voltage source, and a second electrode of the first transistor is connected with the pull-up node; and

a control electrode of second transistor is connected with the signal input terminal, a first electrode of the second transistor is connected with the first voltage source, and a second electrode of the second transistor is connected with the first node.

3. The shift register according to claim 1 , wherein the first reset sub-circuit comprises: a third transistor and a fourth transistor,

a control electrode of the third transistor is connected with the reset terminal, a first electrode of the third transistor is connected with the second voltage source, and a second electrode of the third transistor is connected with the pull-up node; and

a control electrode of the fourth transistor is connected with the reset terminal, a first electrode of the fourth transistor is connected with the second voltage source, and a second electrode of the fourth transistor is connected with the first node.

4. The shift register according to claim 1 , wherein the pull-down sub-circuit comprises: a fifth transistor, a sixth transistor and a seventh transistor,

a control electrode of the fifth transistor is connected with the first node, a first electrode of the fifth transistor is connected with the fourth voltage source, and a second electrode of the fifth transistor is connected with the pull-down node;

a control electrode of the sixth transistor is connected with the pull-down node, a first electrode of the sixth transistor is connected with the fourth voltage source, and a second electrode of the sixth transistor is connected with the pull-up node; and

a control electrode of the seventh transistor is connected with the pull-down node, a first electrode of the seventh transistor is connected with the fourth voltage source, and a second electrode of the seventh transistor is connected with the signal output terminal.

5. The shift register according to claim 1 , wherein the pull-down control sub-circuit comprises: an eighth transistor, a ninth transistor, a tenth transistor and an eleventh transistor,

a control electrode and a first electrode of the eighth transistor both are connected with the third voltage source, and a second electrode of the eighth transistor is connected with a second node;

a control electrode of the ninth transistor is connected with the second node, a first electrode of the ninth transistor is connected with the third voltage source, and a second electrode of the ninth transistor is connected with the pull-down node;

a control electrode of the tenth transistor is connected with the pull-up node, a first electrode of the tenth transistor is connected with the second node, and a second electrode of the tenth transistor is connected with the fourth voltage source; and

a control electrode of the eleventh transistor is connected with the pull-up node, a first electrode of the eleventh transistor is connected with the pull-down node, and a second electrode of the eleventh transistor is connected with the fourth voltage source.

6. The shift register according to claim 1 , wherein the output sub-circuit comprises: a twelfth transistor and a capacitor,

a control electrode of the twelfth transistor is connected with the pull-up node, a first electrode of the twelfth transistor is connected with the clock signal terminal, and a second electrode of the twelfth transistor is connected with the signal output terminal; and

a terminal of the capacitor is connected with the pull-up node, and the other terminal of the capacitor is connected with the signal output terminal.

7. The shift register according to claim 1 , wherein the second reset sub-circuit comprises: a thirteenth transistor and a fourteenth transistor,

a control electrode of the thirteenth transistor is connected with the total reset terminal, a first electrode of the thirteenth transistor is connected with the fourth voltage source, and a second electrode of the thirteenth transistor is connected with the signal output terminal; and

a control electrode of the fourteenth transistor is connected with the total reset terminal, a first electrode of the fourteenth transistor is connected with the fourth voltage source, and a second electrode of the fourteenth transistor is connected with the pull-up node.

8. The shift register according to claim 1 , wherein the input sub-circuit comprises: a first transistor and a second transistor, the first reset sub-circuit comprises a third transistor and a fourth transistor, the pull-down sub-circuit comprises a fifth transistor, a sixth transistor, and a seventh transistor, the pull-down control sub-circuit comprises an eighth transistor, a ninth transistor, a tenth transistor and an eleventh transistor, the output sub-circuit includes a twelfth transistor and a capacitor, and the second reset sub-circuit comprises: a thirteenth transistor and a fourteenth transistor,

a control electrode of the first transistor is connected with the signal input terminal, a first electrode of the first transistor is connected with the first voltage source, and a second electrode of the first transistor is connected with the pull-up node;

a control electrode of second transistor is connected with the signal input terminal, a first electrode of the second transistor is connected with the first voltage source, and a second electrode of the second transistor is connected with the first node;

a control electrode of the third transistor is connected with the reset terminal, a first electrode of the third transistor is connected with the second voltage source, and a second electrode of the third transistor is connected with the pull-up node;

a control electrode of the fourth transistor is connected with the reset terminal, a first electrode of the fourth transistor is connected with the second voltage source, and a second electrode of the fourth transistor is connected with the first node;

a control electrode of the fifth transistor is connected with the first node, a first electrode of the fifth transistor is connected with the fourth voltage source, and a second electrode of the fifth transistor is connected with the pull-down node;

a control electrode of the sixth transistor is connected with the pull-down node, a first electrode of the sixth transistor is connected with the fourth voltage source, and a second electrode of the sixth transistor is connected with the pull-up node; and

a control electrode of the seventh transistor is connected with the pull-down node, a first electrode of the seventh transistor is connected with the fourth voltage source, and a second electrode of the seventh transistor is connected with the signal output terminal;

a control electrode and a first electrode of the eighth transistor both are connected with the third voltage source, and a second electrode of the eighth transistor is connected with a second node;

a control electrode of the ninth transistor is connected with the second node, a first electrode of the ninth transistor is connected with the third voltage source, and a second electrode of the ninth transistor is connected with the pull-down node;

a control electrode of the tenth transistor is connected with the pull-up node, a first electrode of the tenth transistor is connected with the second node, and a second electrode of the tenth transistor is connected with the fourth voltage source;

a control electrode of the eleventh transistor is connected with the pull-up node, a first electrode of the eleventh transistor is connected with the pull-down node, and a second electrode of the eleventh transistor is connected with the fourth voltage source;

a control electrode of the twelfth transistor is connected with the pull-up node, a first electrode of the twelfth transistor is connected with the clock signal terminal, and a second electrode of the twelfth transistor is connected with the signal output terminal;

a terminal of the capacitor is connected with the pull-up node, and the other terminal of the capacitor is connected with the signal output terminal;

a control electrode of the thirteenth transistor is connected with the total reset terminal, a first electrode of the thirteenth transistor is connected with the fourth voltage source, and a second electrode of the thirteenth transistor is connected with the signal output terminal; and

a control electrode of the fourteenth transistor is connected with the total reset terminal, a first electrode of the fourteenth transistor is connected with the fourth voltage source, and a second electrode of the fourteenth transistor is connected with the pull-up node.

9. A gate driving circuit, comprising a plurality of cascaded shift registers according to claim 1 .

10. A driving method for a shift register, applied to the shift register according to claim 1 , wherein during a forward scan, the driving method comprises:

providing, by the input sub-circuit, under the control of the signal input terminal, the signal of the first voltage source to the pull-up node and the first node; pulling down, by the pull-down control sub-circuit, according to the level of the pull-up node, the level of the pull-down node; outputting, by the pull-down sub-circuit, according to the level of the first node, the level of the fourth voltage source to the pull-down node;

outputting, by the output sub-circuit, according to the level of the pull-up node, the signal of the clock signal terminal to the signal output terminal; and

providing, by the first reset sub-circuit, under the control of the reset terminal, the signal of the second voltage source to the pull-up node and the first node respectively; pulling up, by the pull-down control sub-circuit, according to the signal of the third voltage source, the level of the pull-down node; outputting, by the pull-down sub-circuit, according to the level of the pull-down node, the level of the fourth voltage source to the pull-up node and the signal output terminal.

11. The driving method according to claim 10 , wherein during a reverse scan, the driving method comprises:

providing, by the first reset sub-circuit, under the control of the reset terminal, the signal of the second voltage source to the pull-up node and the first node respectively; pulling down, by the pull-down control sub-circuit, according to the level of the pull-up node, the level of the pull-down node; outputting, by the pull-down sub-circuit, according to the level of the first node, the level of the fourth voltage source to the pull-down node;

outputting, by the output sub-circuit, according to the level of the pull-up node, the signal of the clock signal terminal to the signal output terminal; and

providing, by the input sub-circuit, under the control of the signal input terminal, the signal of the first voltage source to the pull-up node and the first node respectively; pulling up, by the pull-down control sub-circuit, according to the signal of the third voltage source, the level of the pull-down node; outputting, by the pull-down sub-circuit, according to the level of the pull-down node, the level of the fourth voltage source to the pull-up node and the signal output terminal.