Patent ID: 7880503

Claim:
A method of driving gate lines in which output signals of a plurality of stages are output to the respective gate lines, each of the output signals comprising a gate-on voltage and a gate-off voltage, the stages being connected to each other, the stages including a first stage in which a vertical start signal is transmitted to an input terminal, the method comprising: boosting up a voltage of a first node based upon a carry signal from a previous stage or the vertical start signal from an external device; outputting the gate-on voltage pulled up through an output terminal of a present stage based upon a high level of a first clock signal, in response to a high level of the first node; outputting the gate-off voltage through the output terminal of the present stage in response to the output signal from a next stage or the vertical start signal; discharging the first node in response to the output signal from the next stage or a carry signal from a last stage; and applying a negative ripple voltage to the first node which is discharged in accordance with the first clock signal.