Shift register unit, shift register circuitry and display device

A shift register circuitry, comprising a plurality of cascaded shift register units;

• wherein each of the plurality of shift register units comprises:
• a pull-down node control circuit, connected to a control node and a pull-down node, and configured to control a change in a potential of the pull-down node according to a potential of the control node, wherein the potential of the control node and the potential of the pull-down node are inversed in phase;
• and
• a first potential regulating circuit, connected to an upper-stage pull-up node and the control node, and configured to:
• transmit a potential of the upper-stage pull-up node to the control node when the potential of the upper-stage pull-up node is an effective operating potential;
• and disconnect a connection between the control node and the upper-stage pull-up node when the potential of the upper-stage pull-up node is not an effective operating potential;
• wherein the upper-stage pull-up node is a pull-up node in an upper-stage shift register unit adjacent to the shift register unit in the shift register circuitry, and an upper-stage pull-down node is a pull-down node in an upper-stage shift register unit adjacent to the shift register unit in the shift register circuitry,
• excepting a first stage of shift register unit, a first potential regulating circuit included in each stage of the shift register units is connected to an upper-stage pull-up node, and a second potential regulating circuit included in each stage of the shift register units is connected to an upper-stage pull-down node.