Patent ID: 8081731

Claim:
A shift register, comprising a plurality of electrically connected shift units, wherein each shift unit comprises: a pull-up circuit, for outputting a first signal to an output node according to the first signal and a voltage level of a driving node; a pull-up driving circuit, electrically connected to the pull-up circuit, for driving the pull-up circuit according to an output voltage of the previous shift unit; a pull-down driving circuit, electrically connected to the pull-up driving circuit, for outputting a low voltage level to the driving node and the output node, according to the first signal and a second signal, comprising: a first transistor, comprising a first end for receiving the first signal, a control end electrically connected to the first end, and a second end electrically connected to a first node; a second transistor, comprising a first end electrically connected to the first node, a control end electrically connected to the output node and a second end for receiving the low voltage level; a third transistor, comprising a first end electrically connected to the output node, a control end electrically connected to the first node, and a second end for receiving the low voltage level; a fourth transistor, comprising a first end electrically connected to the driving node, a control end for receiving the first signal, and a second end electrically connected to the output node; and a fifth transistor, comprising a first end electrically connected to the output node, a control end for receiving the second signal, and a second end for receiving the low voltage level; and a pull-down circuit, electrically connected to the pull-up circuit and the pull-up driving circuit, for resetting the pull-up driving circuit according to the voltage level of the output node, and outputting the low voltage level to the driving node and the output node according to a third signal and a fourth signal.