Shift register and method of driving the same, gate driving circuit, and display device

1. A shift register, comprising a first input sub-circuit, a first pull-down control sub-circuit, a second pull-down control sub-circuit, a pull-down sub-circuit and n output sub-circuits, wherein n is greater than or equal to 2, and n is a positive integer;

the first input sub-circuit is coupled to a first signal input terminal, a first control voltage terminal and a pull-up node, and the first input sub-circuit is configured to output a voltage on the first control voltage terminal to the pull-up node under control of the first signal input terminal;

each output sub-circuit is coupled to the pull-up node, a signal output terminal and an output clock signal terminal, and the output sub-circuit is configured to output a signal from the output clock signal terminal to the signal output terminal under control of the pull-up node;

the first pull-down control sub-circuit is coupled to the first control voltage terminal, a first clock signal terminal and a pull-down node, and the first pull-down control sub-circuit is configured to output a voltage on the first control voltage terminal to the pull-down node under control of the first clock signal terminal;

the second pull-down control sub-circuit is coupled to the pull-up node, the pull-down node and a first voltage terminal, and the second pull-down control sub-circuit is configured to pull down a voltage on the pull-down node to a first voltage under control of the pull-up node;

the pull-down sub-circuit is coupled to the pull-up node, the pull-down node and the first voltage terminal, and the pull-down sub-circuit is configured to pull down a voltage on the pull-up node to the first voltage under control of the pull-down node.

2. The shift register according to claim 1 , wherein the first input sub-circuit includes a first transistor;

a gate of the first transistor is coupled to the first signal input terminal, a first electrode of the first transistor is coupled to the first control voltage terminal, and a second electrode of the first transistor is coupled to the pull-up node.

3. The shift register according to claim 1 , wherein each output sub-circuit includes an output transistor and a voltage stabilizing capacitor;

a gate of the output transistor is coupled to the pull-up node, a first electrode of the output transistor is coupled to the output clock signal terminal, and a second electrode of the output transistor is coupled to the signal output terminal;

one end of the voltage stabilizing capacitor is coupled to the pull-up node, and another end of the voltage stabilizing capacitor is coupled to the output signal output terminal.

4. The shift register according to claim 1 , wherein the first pull-down control sub-circuit includes a second transistor; a gate of the second transistor is coupled to the first clock signal terminal, a first electrode of the second transistor is coupled to the first control voltage terminal, and a second electrode of the second transistor is coupled to the pull-down node;

the second pull-down control sub-circuit includes a third transistor; a gate of the third transistor is coupled to the pull-up node, a first electrode of the third transistor is coupled to the pull-down node, and a second electrode of the third transistor is coupled to the first voltage terminal;

the pull-down sub-circuit includes a fourth transistor; a gate of the fourth transistor is coupled to the pull-down node, a first electrode of the fourth transistor is coupled to the pull-up node, and a second electrode of the fourth transistor is coupled to the first voltage terminal.

5. The shift register according to claim 1 , wherein the pull-down sub-circuit is further coupled to the signal output terminal, and the pull-down sub-circuit is further configured to pull down a potential at the signal output terminal to the first voltage terminal under control of the pull-down node;

the pull-down sub-circuit further includes a plurality of output pull-down transistors;

a gate of each output pull-down transistor is coupled to the pull-down node, a first electrode of the output pull-down transistor is coupled to a signal output terminal, and a second electrode of the output pull-down transistor is coupled to the first voltage terminal.

6. The shift register according to claim 1 , wherein the shift register further comprises a first voltage-regulator and noise-reduction sub-circuit coupled between the first input sub-circuit and the pull-up node, and the first voltage-regulator and noise-reduction sub-circuit is further coupled to the first voltage terminal and/or a second voltage terminal;

the first voltage-regulator and noise-reduction sub-circuit is configured to stabilize a voltage on the pull-up node and reduce noise of the voltage on the pull-up note under control of the first voltage terminal and/or the second voltage terminal.

7. The shift register according to claim 6 , wherein the first voltage-regulator and noise-reduction sub-circuit includes a first capacitor and/or a fifth transistor;

one end of the first capacitor is coupled to an output terminal of the first input sub-circuit, and another end of the first capacitor is coupled to the first voltage terminal;

a gate of the fifth transistor is coupled to the second voltage terminal, a first electrode of the fifth transistor is coupled to the output terminal of the first input sub-circuit, and a second electrode of the fifth transistor is coupled to the pull-up node.

8. The shift register according to claim 1 , wherein the shift register further comprises a second voltage-regulator and noise-reduction sub-circuit coupled between the first pull-down control sub-circuit and the pull-down node, and the second voltage-regulator and noise-reduction sub-circuit is also coupled to the first voltage terminal and/or the second voltage terminal;

the second voltage-regulator and noise-reduction sub-circuit is configured to stabilize a voltage on the pull-down node and reduce noise of the voltage on the pull-down node under control of the first voltage terminal and/or the second voltage terminal.

9. The shift register according to claim 8 , wherein the second voltage-regulator and noise-reduction sub-circuit includes a second capacitor and/or a sixth transistor;

one end of the second capacitor is electrically connected to an output terminal of the first pull-down control sub-circuit, and another end of the second capacitor is coupled to the first voltage terminal;

a gate of the sixth transistor is coupled to the second voltage terminal, a first electrode of the sixth transistor is coupled to the output terminal of the first pull-down control sub-circuit, and a second electrode of the sixth transistor is coupled to the pull-down node.

10. The shift register according to claim 1 , wherein the shift register further comprises a second input sub-circuit;

the second input sub-circuit is coupled to a second signal input terminal, a second control voltage terminal, and the pull-up node, and the first second input sub-circuit is configured to output a voltage on the second control voltage terminal to the pull-up node under control of the second signal input terminal.

11. The shift register according to claim 10 , wherein the second input sub-circuit includes an eighth transistor;

a gate of the eighth transistor is coupled to the second signal input terminal, a first electrode of the eighth transistor is coupled to the second control voltage terminal, and a second electrode of the eighth transistor is coupled to the pull-up node.

12. A gate driving circuit, comprising a plurality of cascaded shift registers according to claim 10 , wherein

a first signal input terminal of a first-stage shift register is coupled to an initial signal terminal;

except for the first-stage shift register, a first signal input terminal of each stage of the shift registers is coupled to a last signal output terminal of a shift register in a previous stage of the shift register in this stage;

except for a last stage shift register, a second signal input terminal of each stage of the shift registers is coupled to a first signal output terminal of a shift register in a next stage of the shift register in this stage;

a second signal input terminal of the last stage shift register is coupled to the initial signal terminal.

13. A display device, comprising the gate driving circuit according to claim 12 .

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

a first signal input terminal of a first-stage shift register is coupled to an initial signal terminal;

except for the first-stage shift register, a first signal input terminal of each stage of the shift registers is coupled to a last signal output terminal of a shift register in a previous stage of the shift register in this stage.

15. A display device, comprising the gate driving circuit according to claim 14 .

16. The shift register according to claim 1 , wherein the shift register further comprises a third pull-down control sub-circuit;

the third pull-down control sub-circuit is coupled to a second control voltage terminal, a second clock signal terminal, and the pull-down node, and the third pull-down control sub-circuit is configured to output a voltage on the second control voltage terminal to the pull-down node under control of the second clock signal terminal.

17. The shift register according to claim 16 , wherein the third pull-down control sub-circuit includes a ninth transistor;

a gate of the ninth transistor is coupled to the second clock signal terminal, a first electrode of the ninth transistor is coupled to the second control voltage terminal, and a second electrode of the ninth transistor is coupled to the pull-down node.

18. A method of driving the shift register according to claim 1 , wherein within one image frame, the method comprises:

in a charging period, outputting, by the first input sub-circuit, a voltage on the first control voltage terminal to the pull-up node under the control of the first signal input terminal, and pulling down, by the second pull-down control sub-circuit, a voltage on the pull-down node to the first voltage terminal under the control of the pull-up node;

storing, by each output sub-circuit, a signal at the pull-up node, and outputting, by the output sub-circuit, a signal input via each output clock signal terminal to a signal output terminal coupled to the output sub-circuit under the control of the pull-up node;

in an output period, outputting, by each output sub-circuit, a signal stored in the previous period to the pull-up node, and outputting, by output sub-circuits, signals from output clock signal terminals to signal output terminals coupled to the output sub-circuits in sequence under the control of the pull-up node, so that gate scanning signals are output from the signal output terminals in sequence; and

in a reset period, outputting, by the first pull-down control sub-circuit, a voltage on the first control voltage terminal to the pull-down node under the control of the first clock signal terminal;

pulling down, by the pull-down sub-circuit, a voltage on the pull-up node to the first voltage terminal under the control of the pull-down node.