Shift register, driving method, gate driving circuit and display device

The shift register according to 1, wherein the latch circuit comprises:

• an input sub-circuit and a latch sub-circuit;
• the input sub-circuit is respectively connected to the input signal end, the pull-up node and a pull-down node, and is configured to control a potential of the pull-down node to the first potential when the potential of the pull-up node and the potential of the input signal are both the second potential, and control the potential of the pull-down node to be the second potential when the input signal is at the first potential;
• and
• the latch sub-circuit is respectively connected to the pull-down node and the pull-up node, and is configured to control the potential of the pull-up node to be the second potential when the potential of the pull-down node is the first potential, and control the potential of the pull-up node to be the first potential when the potential of the pull-down node is the second potential.

The shift register according to 6, wherein the input sub-circuit comprises:

• a second transistor, a third transistor, a fourth transistor, and a fifth transistor;
• a gate electrode of the second transistor is connected to the pull-up node, a first electrode of the second transistor is connected to a first power supply end, and a second electrode of the second transistor is connected to a first electrode of the third transistor;
• a gate electrode of the third transistor is connected to the input signal end, and a second electrode of the third transistor is connected to the pull-down node;
• a gate electrode of the fourth transistor is connected to the input signal end, a first electrode of the fourth transistor is connected to a second power supply end, and a second electrode of the fourth transistor is connected to the pull-down node;
• a gate electrode of the fifth transistor is connected to the pull-up node, a first electrode of the fifth transistor is connected to the second power supply end, and a second electrode of the fifth transistor is connected to the pull-down node;
• and
• the second transistor has the same polarity as the third transistor, the fourth transistor has the same polarity as the fifth transistor, and the second transistor is opposite in polarity to the fourth transistor.

The shift register according to 6, wherein the latch sub-circuit comprises:

• a sixth transistor and a seventh transistor;
• a gate electrode of the sixth transistor is connected to the pull-down node, a first electrode of the sixth transistor is connected to the first power supply end, and a second electrode of the sixth transistor is connected to the pull-up node;
• a gate electrode of the seventh transistor is connected to the pull-down node, a first electrode of the seventh transistor is connected to the second power supply end, and a second electrode of the seventh transistor is connected to the pull-up node;
• and
• the sixth transistor is opposite in polarity to the seventh transistor.

The shift register according to 1, wherein the output control circuit comprises:

• an eighth transistor, a ninth transistor, and a tenth transistor;
• a gate electrode of the eighth transistor is connected to the pull-up node, a first electrode of the eighth transistor is connected to the first power supply end, and a second electrode of the eighth transistor is connected to the control node;
• a gate electrode of the ninth transistor is connected to the pull-up node, a first electrode of the ninth transistor is connected to a second electrode of the tenth transistor, and a second electrode of the ninth transistor is connected to the control node;
• a gate electrode of the tenth transistor is connected to the clock signal end, and a first electrode of the tenth transistor is connected to the second power supply end;
• and
• the ninth transistor has the same polarity as the tenth transistor, and the eighth transistor is opposite in polarity to the ninth transistor.

The shift register according to 1, wherein the output circuit comprises:

• a twelfth transistor and a thirteenth transistor;
• a gate electrode of the twelfth transistor is connected to the control node, a first electrode of the twelfth transistor is connected to the first power supply end, and a second electrode of the twelfth transistor is connected to the output end;
• a gate electrode of the thirteenth transistor is connected to the control node, a first electrode of the thirteenth transistor is connected to the second power supply end, and a second electrode of the thirteenth transistor is connected to the output end;
• and
• the twelfth transistor is opposite in polarity to the thirteenth transistor.

A driving method for a shift register, wherein the shift register comprises:

• a reset circuit, a latch circuit, an output control circuit, and an output circuit, and the method comprises:
• in a charging stage, the input signal output by an input signal end being at a first potential, controlling, by the latch circuit, the potential of a pull-up node to be the first potential under the control of the input signal;
• in an output stage, the clock signal output by a clock signal end being at the first potential, maintaining the pull-up node to be at the first potential, controlling, by the output control circuit, the potential of a control node to be a second potential under control of the pull-up node and the clock signal;
• and controlling, by the output circuit, the potential of an output end to be the first potential under control of the control node;
• and
• in a reset stage, the reset signal output by a reset signal end being at the first potential, the input signal being at the second potential, controlling, by the reset circuit, the potential of the pull-up node to be the second potential under control of the reset signal;
• maintaining, by the latch circuit, the potential of the pull-up node to be the second potential under the control of the pull-up node and the input signal;
• controlling, by the output control circuit, the potential of the control node to be the first potential under the control of the pull-up node;
• and controlling, by the output circuit, the potential of the output end to be the second potential under the control of the control node.

The method according to 16, wherein the shift register further comprises:

• a pull-up node control circuit, and the method further comprises:
• in a maintaining stage, the enable signal output by an enable signal end being at the first potential, controlling, by the pull-up node control circuit, the potential of the pull-up node to be the second potential under control of the enable signal;
• controlling, by the output control circuit, the potential of the control node to be the first potential under the control of the pull-up node;
• and controlling, by the output circuit, the potential of the output end to he the second potential under the control of the control node.

The method according to 16, wherein the latch circuit comprises:

• an input sub-circuit and a latch sub-circuit;
• controlling, by the latch circuit, the potential of the pull-up node to he the first potential under control of the input signal comprises:
• controlling, by the input sub-circuit, the potential of a pull-down node to be the second potential under the control of the input signal;
• and controlling, by the latch sub-circuit, the potential of the pull-up node to be the first potential under the control of the pull-down node;
• and
• maintaining, by the latch circuit, the potential of the pull-up node to be the second potential under the control of the pull-up node and the input signal comprises:
• controlling, by the input sub-circuit, the potential of the pull-down node to be the first potential under the control of the pull-up node and the input signal;
• and controlling, by the latch sub-circuit, the potential of the pull-up node to be the second potential under the control of the pull-down node.

A gate driving circuit, comprising a plurality of cascaded shift registers, the shift register comprising:

• a reset circuit, a latch circuit, an output control circuit, and an output circuit, wherein
• the reset circuit is respectively connected to an input signal end, a reset signal end and a pull-up node, and is configured to provide an input signal from the input signal end for the pull-up node under the control of a reset signal from the reset signal end;
• the latch circuit is respectively connected to the input signal end and the pull-up node, and is configured to maintain a potential of the pull-up node to be a second potential when the potential of the pull-up node and a potential of the input signal are both the second potential, and control the potential of the pull-up node to be a first potential when the potential of the input signal is the first potential;
• the output control circuit is respectively connected to the pull-up node, a clock signal end, and a control node, and is configured to control a potential of the control node to be the first potential when the potential of the pull-up node is the second potential, and control the potential of the control node to be the second potential when the potential of the pull-up node and the potential of a clock signal from the clock signal end are both the first potential;
• and
• the output circuit is respectively connected to the control node and an output end, and is configured to control the potential of the output end to be the second potential when the potential of the control node is the first potential, and control the potential of the output end to be the first potential when the potential of the control node is the second potential.