Goa circuit and display panel and display device including the same

A display panel comprising a GOA circuit, wherein the GOA circuit is GOA circuits of multiple levels that are set by cascading, the GOA circuit of each level comprises a pull-up control unit, a pull-up unit, a signal downward transmission unit, a pull-down unit, a pull-down maintaining unit, and a bootstrap unit, the GOA circuit of each level is disposed with a clock signal input end, a first node, a first voltage input end, a pull-down maintaining signal output end and a scan signal output end outputting to a horizontal scan line, the first node being on a connection line between the pull-up control unit and the bootstrap unit,

• wherein the pull-down maintaining unit comprises a first pull-down maintaining transistor, a pull-down maintaining capacitor and a second pull-down maintaining transistor,
• a gate of the first pull-down maintaining transistor is connected to an output end of a lower-level signal downward transmission unit, and a source and a drain are respectively connected to a lower-level scan signal output end and a pull-down maintaining signal output end,
• the pull-down maintaining capacitor is connected between the drain of the first pull-down maintaining transistor and the first voltage input end,
• a gate of the second pull-down maintaining transistor is connected to an upper-level first node, and a source and a drain are respectively connected to the pull-down maintaining signal output end and the first voltage input end, and
• the pull-down unit pulls down a potential of the first node and a potential of the scan signal output end to a first voltage input to the first voltage input end based on a pull-down maintaining signal output from the pull-down maintaining signal output end.