The invention discloses a high-speed grid driving unit and a circuit, and the circuit comprises an input and reset unit which transmits a high-level
signal of a first input
signal to an internal nodeQ1 when a first
clock signal is at a high level, so that the Q1 is charged to a high level; an
inverter unit which is used for receiving the high-level second
clock signal, charging the internal nodeQB to a high level through a high-
voltage input signal VH, and
coupling the high level of the QB to the internal node Q2 through the descending
coupling unit to improve the potential of the Q2; an Output driving unit, wherein when Q1 is at a
high potential, the output drive unit is enabled, the pull-down
discharge of the scanning signal is accelerated when the third
clock signal is at a low levelthrough the Q2 with the increased potential. By increasing the
overdrive voltage and enhancing the
discharge capacity, when the QB is at a
high potential, the low-level maintaining unit pulls down a scanning signal through a low-
voltage input signal VSS and maintains the scanning signal at a low level, the driving tube and the pull-down tube are conducted at the same time, the
discharge current loaded on the scanning line is increased, and the reduction speed of the scanning signal is increased.