Shift register unit, driving method, gate driving circuit and display panel

A driving method for a shift register unit applied to a display panel, comprising:

• providing the shift register unit, the shift register unit comprising:
• a first signal terminal;
• a second signal terminal;
• a first pull-down control circuit coupled to the second signal terminal, a pull-up node, a first pull-down node, a third signal terminal, and a first pull-down control node, and configured to transmit, in response to a signal of the pull-up node, a signal of the third signal terminal to the first pull-down node and the first pull-down control node, and transmit, in response to the signal of the second signal terminal, the signal of the second terminal to the first pull-down node and the first pull-down control node;
• a second pull-down control circuit coupled to the first signal terminal, the pull-up node, a second pull-down node, the third signal terminal, and a second pull-down control node, and configured to transmit, in response to the signal of the pull-up node, the signal of the third signal terminal to the second pull-down node and the second pull-down control node, and transmit, in response to the signal of the first signal terminal, the signal of the first signal terminal to the second pull-down node and the second pull-down control node;
• a first pull-down circuit coupled to the first pull-down node, the first signal terminal and a pull-down target node, and configured to transmit, in response to a signal of the first pull-down node, the signal of the first signal terminal to the pull-down target node;
• and
• a second pull-down circuit coupled to the second pull-down node, the second signal terminal, and the pull-down target node, and configured to transmit, in response to a signal of the second pull-down node, the signal of the second signal terminal to the pull-down target node, wherein the pull-down target node comprises one or more of the first output terminal, the second output terminal, and the pull-up node;
• in a display state of the display panel, alternatively outputting a high level and a low level from the first signal terminal, and alternatively outputting a high level and a low level from the second signal terminal, wherein a level logic of a signal output from the second signal terminal is opposite to the level logic of a signal output from the first signal terminal.

A gate driving circuit, comprising a plurality of shift register units which are cascaded, wherein the shift register unit comprises:

• a first signal terminal configured to output high level and low level alternately;
• a second signal terminal configured to output high level and low level alternately, wherein a level logic of a signal output from the second signal terminal is opposite to the level logic of a signal output from the first signal terminal;
• a first pull-down control circuit coupled to the second signal terminal, a pull-up node, a first pull-down node, a third signal terminal, and a first pull-down control node, and configured to transmit, in response to a signal of the pull-up node, a signal of the third signal terminal to the first pull-down node and the first pull-down control node, and transmit, in response to the signal of the second signal terminal, the signal of the second terminal to the first pull-down node and the first pull-down control node;
• a second pull-down control circuit coupled to the first signal terminal, the pull-up node, a second pull-down node, the third signal terminal, and a second pull-down control node, and configured to transmit, in response to the signal of the pull-up node, the signal of the third signal terminal to the second pull-down node and the second pull-down control node, and transmit, in response to the signal of the first signal terminal, the signal of the first signal terminal to the second pull-down node and the second pull-down control node;
• a first pull-down circuit coupled to the first pull-down node, the first signal terminal, and a pull-down target node, and configured to transmit, in response to a signal of the first pull-down node, the signal of the first signal terminal to the pull-down target node;
• and
• a second pull-down circuit coupled to the second pull-down node, the second signal terminal, and the pull-down target node, and configured to transmit, in response to a signal of the second pull-down node, the signal of the second signal terminal to the pull-down target node, wherein the pull-down target node comprises one or more of the first output terminal, the second output terminal, and the pull-up node.