CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority of Chinese Patent Application No. 201910138433.6, filed on Feb. 25, 2019, and for all purposes, the entire content disclosed by the Chinese patent application is incorporated herein by reference as part of the present application.

TECHNICAL FIELD

Embodiments of the present disclosure relate to a shift register unit and a driving method thereof, a gate driving circuit, and a display device.

BACKGROUND

In a field of display technology, a display panel, such as a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display panel, includes a plurality of gate lines and a plurality of data lines. The plurality of gate lines can be driven by a gate driving circuit. The gate driving circuit is usually integrated in a Gate IC (integrated circuit). With the rapid development of the display technology, display panels are increasingly developing towards high integration and low cost. In the design of the Gate IC, an area of a chip is a main factor affecting a cost of the chip. How to effectively reduce the chip area is a problem that technical developers need to consider emphatically.

SUMMARY

Some embodiments of the present disclosure provides a shift register unit, which includes a first input circuit, a second input circuit, an output circuit, and a compensation circuit, the first input circuit is connected to a first node, and is configured to write a first input signal to the first node in response to a first control signal; the second input circuit is connected to the first node and a second node, and is configured to input a second input signal to the second node in response to a detection control signal and configured to transmit a level of the second node to the first node in response to a second control signal; the compensation circuit is connected to the second node, and is configured to compensate the level of the second node; and the output circuit is connected to the first node and an output terminal, and is configured to output a composite output signal to the output terminal under control of a level of the first node.

For example, in the shift register unit provided by some embodiments of the present disclosure, the compensation circuit comprises a first compensation sub-circuit, a second compensation sub-circuit, and a storage sub-circuit, the first compensation sub-circuit is connected to the second node and a third node, respectively, and is configured to write a first clock signal to the third node under control of the level of the second node; the storage sub-circuit is connected to the second node and the third node, respectively, and is configured to compensate the level of the second node based on the first clock signal written to the third node; and the second compensation sub-circuit is connected to the third node, and is configured to perform noise reduction on the third node under control of a compensation noise reduction signal.

For example, in the shift register unit provided by some embodiments of the present disclosure, the second compensation sub-circuit is further connected to a fourth node to receive a voltage of the fourth node as the compensation noise reduction signal.

For example, in the shift register unit provided by some embodiments of the present disclosure, the first compensation sub-circuit comprises a first compensation transistor, the second compensation sub-circuit comprises a second compensation transistor, the storage sub-circuit comprises a first capacitor, a first electrode of the first compensation transistor is connected to a first clock signal terminal to receive the first clock signal, a second electrode of the first compensation transistor is connected to the third node, a gate electrode of the first compensation transistor is connected to the second node, a first terminal of the first capacitor is connected to the second node, a second terminal of the first capacitor is connected to the third node, a first electrode of the second compensation transistor is connected to the third node, a second electrode of the second compensation transistor is connected to a first voltage terminal, and a gate electrode of the second compensation transistor is connected to the fourth node.

For example, in the shift register unit provided by some embodiments of the present disclosure, the first clock signal is identical to the second control signal.

For example, in the shift register unit provided by some embodiments of the present disclosure, the second input circuit comprises a charging sub-circuit and an isolation sub-circuit, the charging sub-circuit is configured to input the second input signal to the second node in response to the detection control signal; and the isolation sub-circuit is connected to the first node and the second node, respectively, and is configured to transmit the level of the second node to the first node under control of the second control signal.

For example, in the shift register unit provided by some embodiments of the present disclosure, the charging sub-circuit comprises a first transistor, a gate electrode of the first transistor is configured to receive the detection control signal, a first electrode of the first transistor is configured to receive the second input signal, and a second electrode of the first transistor is connected to the second node; and the isolation sub-circuit comprises a second transistor, a gate electrode of the second transistor is configured to receive the second control signal, a first electrode of the second transistor is connected to the second node, and a second electrode of the second transistor is connected to the first node.

For example, in the shift register unit provided by some embodiments of the present disclosure, the first input circuit comprises a third transistor, a gate electrode of the third transistor is connected to a first control signal terminal to receive the first control signal, a first electrode of the third transistor is configured to receive the first input signal, and a second electrode of the third transistor is connected to the first node.

For example, in the shift register unit provided by some embodiments of the present disclosure, the output terminal comprises a shift signal output terminal and a first scanning signal output terminal, the output circuit comprises a first output transistor, a second output transistor, and a second capacitor; a gate electrode of the first output transistor is connected to the first node, a first electrode of the first output transistor is connected to a first output clock signal terminal to receive a first output clock signal, and a second electrode of the first output transistor is connected to the shift signal output terminal; a gate electrode of the second output transistor is connected to the first node, a first electrode of the second output transistor is connected to the first output clock signal terminal to receive the first output clock signal, and a second electrode of the second output transistor is connected to the first scanning signal output terminal; a first terminal of the second capacitor is connected to the first node, and a second terminal of the second capacitor is connected to the second electrode of the second output transistor; and the first output clock signal is transmitted to the shift signal output terminal via the first output transistor and serves as a first output signal, the first output clock signal is transmitted to the first scanning signal output terminal via the second output transistor and serves as a second output signal, and the composite output signal comprises the first output signal and the second output signal.

For example, in the shift register unit provided by some embodiments of the present disclosure, the output terminal further comprises a second scanning signal output terminal, and the output circuit further comprises a third output transistor and a third capacitor, a gate electrode of the third output transistor is connected to the first node, a first electrode of the third output transistor is connected to a second output clock signal terminal to receive a second output clock signal, a second electrode of the third output transistor is connected to the second scanning signal output terminal, a first terminal of the third capacitor is connected to the first node, a second terminal of the third capacitor is connected to the second electrode of the third output transistor, and the second output clock signal is transmitted to the second scanning signal output terminal via the third output transistor and serves as a third output signal, and the composite output signal further comprises the third output signal.

For example, the shift register unit provided by some embodiments of the present disclosure further comprises a noise reduction circuit and a first control circuit; the noise reduction circuit is connected to the first node, a fourth node, and the output terminal, and is configured to simultaneously perform noise reduction on the first node and the output terminal under control of a level of the fourth node; and the first control circuit is connected to the first node and the fourth node, and is configured to control the level of the fourth node under control of the level of the first node.

For example, the shift register unit provided by some embodiments of the present disclosure further comprises a second control circuit; the second control circuit is connected to a fourth node, and is configured to control a level of the fourth node in response to a third control signal, and the third control signal comprises a first clock signal and a voltage of the second node.

For example, the shift register unit provided by some embodiments of the present disclosure further comprises a third control circuit; the third control circuit is connected to a fourth node, and is configured to control a level of the fourth node in response to a fourth control signal.

For example, the shift register unit provided by some embodiments of the present disclosure further comprises a first reset circuit and a second reset circuit; the first reset circuit is connected to the first node, and is configured to reset the first node in response to a first reset control signal; and the second reset circuit is connected to the first node, and is configured to reset the first node in response to a second reset control signal.

For example, the shift register unit provided by some embodiments of the present disclosure further comprises a noise reduction circuit, a first control circuit, a second control circuit, a third control circuit, a first reset circuit, and a second reset circuit; the compensation circuit comprises a first compensation transistor, a second compensation transistor, and a first capacitor, a first electrode of the first compensation transistor is connected to a first clock signal terminal to receive a first clock signal, a second electrode of the first compensation transistor is connected to a third node, a gate electrode of the first compensation transistor is connected to the second node, a first terminal of the first capacitor is connected to the second node, a second terminal of the first capacitor is connected to the third node, a first electrode of the second compensation transistor is connected to the third node, a second electrode of the second compensation transistor is connected to a first voltage terminal, and a gate electrode of the second compensation transistor is connected to a fourth node to receive a voltage of the fourth node as a compensation noise reduction signal; the second input circuit comprises a charging sub-circuit and an isolation sub-circuit, the charging sub-circuit comprises a first transistor, a gate electrode of the first transistor is configured to receive the detection control signal, a first electrode of the first transistor is configured to receive the second input signal, a second electrode of the first transistor is connected to the second node, the isolation sub-circuit comprises a second transistor, a gate electrode of the second transistor is configured to receive the second control signal, a first electrode of the second transistor is connected to the second node, and a second electrode of the second transistor is connected to the first node; the first input circuit comprises a third transistor, a gate electrode of the third transistor is configured to receive the first control signal, a first electrode of the third transistor is configured to receive the first input signal, and a second electrode of the third transistor is connected to the first node; the output circuit comprises a first output transistor, a second output transistor, a third output transistor, a second capacitor, and a third capacitor, and the output terminal comprises a shift signal output terminal, a first scanning signal output terminal, and a second scanning signal output terminal, a gate electrode of the first output transistor is connected to the first node, a first electrode of the first output transistor is connected to a first output clock signal terminal to receive a first output clock signal, a second electrode of the first output transistor is connected to the shift signal output terminal, a gate electrode of the second output transistor is connected to the first node, a first electrode of the second output transistor is connected to the first output clock signal terminal to receive the first output clock signal, a second electrode of the second output transistor is connected to the first scanning signal output terminal, a first terminal of the second capacitor is connected to the first node, a second terminal of the second capacitor is connected to the second electrode of the first output transistor, a gate electrode of the third output transistor is connected to the first node, a first electrode of the third output transistor is connected to a second output clock signal terminal to receive a second output clock signal, a second electrode of the third output transistor is connected to the second scanning signal output terminal, a first terminal of the third capacitor is connected to the first node, a second terminal of the third capacitor is connected to the second electrode of the third output transistor, the first output clock signal is transmitted to the shift signal output terminal via the first output transistor and serves as a first output signal, the first output clock signal is transmitted to the first scanning signal output terminal via the second output transistor and serves as a second output signal, the second output clock signal is transmitted to the second scanning signal output terminal via the third output transistor and serves as a third output signal, and the composite output signal comprises the first output signal, the second output signal, and the third output signal; the noise reduction circuit comprises a fourth transistor, a fifth transistor, a sixth transistor, and a seventh transistor, a gate electrode of the fourth transistor is connected to the fourth node, a first electrode of the fourth transistor is connected to the first node, a second electrode of the fourth transistor is connected to the first voltage terminal, a gate electrode of the fifth transistor is connected to the fourth node, a first electrode of the fifth transistor is connected to the shift signal output terminal, a second electrode of the fifth transistor is connected to the first voltage terminal, a gate electrode of the sixth transistor is connected to the fourth node, a first electrode of the sixth transistor is connected to the first scanning signal output terminal, a second electrode of the sixth transistor is connected to the second voltage terminal, a gate electrode of the seventh transistor is connected to the fourth node, a first electrode of the seventh transistor is connected to the second scanning signal output terminal, and a second electrode of the seventh transistor is connected to a second voltage terminal; the first control circuit comprises an eighth transistor and a ninth transistor, a gate electrode of the eighth transistor is connected to a first electrode of the eighth transistor, and is configured to be connected to a third voltage terminal, a second electrode of the eighth transistor is connected to the fourth node, a gate electrode of the ninth transistor is connected to the first node, a first electrode of the ninth transistor is connected to the fourth node, and a second electrode of the ninth transistor is connected to the first voltage terminal; the first reset circuit comprises a tenth transistor, a gate electrode of the tenth transistor is connected to a first reset control signal terminal to receive a first reset control signal, a first electrode of the tenth transistor is connected to the first node, and a second electrode of the tenth transistor is connected to the first voltage terminal; the second reset circuit comprises an eleventh transistor, a gate electrode of the eleventh transistor is connected to a second reset control signal terminal to receive a second reset control signal, a first electrode of the eleventh transistor is connected to the first node, and a second electrode of the eleventh transistor is connected to the first voltage terminal; the second control circuit comprises a twelfth transistor and a thirteenth transistor, a gate electrode of the twelfth transistor is configured to receive the first clock signal, a first electrode of the twelfth transistor is configured to be connected to the fourth node, a second electrode of the twelfth transistor is connected to a first electrode of the thirteenth transistor, a gate electrode of the thirteenth transistor is connected to the second node, and a second electrode of the thirteenth transistor is connected to the first voltage terminal; and the third control circuit comprises a fourteenth transistor, a gate electrode of the fourteenth transistor is configured to receive a fourth control signal, a first electrode of the fourteenth transistor is connected to the fourth node, and a second electrode of the fourteenth transistor is connected to the first voltage terminal.

Some embodiments of the present disclosure also provide a gate driving circuit, which comprises a plurality of shift register units; the plurality of shift register units are cascaded, and each shift register unit in the plurality of shift register units is the shift register unit according to any one of embodiments of the present disclosure.

For example, the gate driving circuit provided by some embodiments of the present disclosure further includes a first clock signal line, a second clock signal line, a third clock signal line, and a fourth clock signal line; in a case where the shift register unit comprises a first output clock signal terminal, a first output clock signal terminal of a (4n1−3)-th stage shift register unit in the plurality of shift register units is connected to the first clock signal line; a first output clock signal terminal of a (4n1−2)-th stage shift register unit in the plurality of shift register units is connected to the second clock signal line; a first output clock signal terminal of a (4n1−1)-th stage shift register unit in the plurality of shift register units is connected to the third clock signal line; a first output clock signal terminal of a (4n1)-th stage shift register unit in the plurality of shift register units is connected to the fourth clock signal line; and n1is an integer greater than zero.

For example, the gate driving circuit provided by some embodiments of the present disclosure further includes a fifth clock signal line, a sixth clock signal line, a seventh clock signal line, and an eighth clock signal line; in a case where the shift register unit comprises a second output clock signal terminal, a second output clock signal terminal of the (4n1−3)-th stage shift register unit is connected to the fifth clock signal line; a second output clock signal terminal of the (4n1−2)-th stage shift register unit is connected to the sixth clock signal line; a second output clock signal terminal of the (4n1−1)-th stage shift register unit is connected to the seventh clock signal line; and a second output clock signal terminal of the (4n1)-th stage shift register unit is connected to the eighth clock signal line.

For example, in the gate driving circuit provided by some embodiments of the present disclosure, in a case where the shift register unit comprises a shift signal output terminal and a first control signal terminal, a first control signal terminal of an (n2+3)-th stage shift register unit in the plurality of shift register units is connected to a shift signal output terminal of an (n2)-th stage shift register unit in the plurality of shift register units, and n2is an integer greater than zero.

For example, in the gate driving circuit provided by some embodiments of the present disclosure, a signal output from the shift signal output terminal of the (n2)-th stage shift register unit serves as a second input signal of an (n2+2)-th stage shift register unit.

For example, in the gate driving circuit provided by some embodiments of the present disclosure, in a case where the shift register unit further comprises a first reset control signal terminal, a first reset control signal terminal of the (n2)-th stage shift register unit is connected to a shift signal output terminal of the (n2+3)-th stage shift register unit.

Some embodiments of the present disclosure also provide a display device including the gate driving circuit described in any one of the above embodiments.

Some embodiments of the present disclosure also provide a driving method for driving the shift register unit as describe in any one of the above embodiments, one frame comprises a display period and a blanking period, the display period comprises a first input phase and a first output phase, the blanking period comprises a second input phase and a second output phase, and the driving method comprises: in the first input phase, in response to the first control signal, the first input circuit writing the first input signal to the first node; in the first output phase, under control of the level of the first node, the output circuit outputting the composite output signal to the output terminal; in the second input phase, the compensation circuit compensating the level of the second node, and in respond to the second control signal, the second input circuit transmitting the level of the second node to the first node; and in the second output phase, the output circuit outputting the composite output signal to the output terminal under control of the level of the first node.

