Patent ID: 11862099
Assignee: HEFEI XINSHENG OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. The shift register unit according to claim 1, wherein the pull-down sub-circuit comprises two pull-down control terminals, the pull-down control circuit comprises a first pull-down control sub-circuit and a second pull-down control sub-circuit, the selection sub-circuit comprises a selection transistor, and a gate electrode of the selection transistor is electrically coupled to a fifth clock signal terminal;
the first pull-down control sub-circuit comprises a first pull-down control transistor, a second pull-down control transistor and a third pull-down control transistor, wherein a gate electrode and a first electrode of the first pull-down control transistor are electrically coupled to a corresponding fourth clock signal terminal, a second electrode of the first pull-down control transistor is electrically coupled to a first electrode of the third pull-down control transistor and one of the two pull-down control terminals of the pull-down sub-circuit, a gate electrode of the second pull-down control transistor is electrically coupled to the second electrode of the first pull-down control transistor, a second electrode of the second pull-down control transistor is directly or indirectly electrically coupled to a second level signal terminal, a first electrode of the second pull-down control transistor is electrically coupled to the pull-up control terminal of the pull-up sub-circuit, and a second electrode of the third pull-down control transistor is electrically coupled to the second level signal terminal, a gate electrode of the third pull-down control transistor is electrically coupled to the pull-up control terminal of the pull-up sub-circuit;
the second pull-down control sub-circuit comprises a fourth pull-down control transistor, a fifth pull-down control transistor and a sixth pull-down control transistor, a gate electrode and a first electrode of the fourth pull-down control transistor are electrically coupled to a corresponding fourth clock signal terminal, a second electrode of the fourth pull-down control transistor is electrically coupled to a first electrode of the sixth pull-down control transistor and the other one of the two pull-down control terminals of the pull-down sub-circuit, a gate electrode of the fifth pull-down control transistor is electrically coupled to the second electrode of the fourth pull-down control transistor, a second electrode of the fifth pull-down control transistor is directly or indirectly electrically coupled to the second level signal terminal, a first electrode of the fifth pull-down control transistor is electrically coupled to the pull-up control terminal of the pull-up sub-circuit, and a second electrode of the sixth pull-down control transistor is electrically coupled to the second level signal terminal, a gate electrode of the sixth pull-down control transistor is electrically coupled to the control terminal of the pull-up sub-circuit; a second electrode of the selection transistor is electrically coupled, directly or indirectly, to the second electrode of the first pull-down control transistor, and a first electrode of the selection transistor is electrically coupled, directly or indirectly, to the second electrode of the fourth pull-down control transistor.