a plurality of groups of gate lines transmitting a gate-on voltage;

a plurality of data lines alternately transmitting normal data voltages and an impulsive data voltage;

a plurality of pixels arranged in a matrix and including switching elements that are connected to the gate lines and the data lines and turn on in response to the gate-on voltage to transmit the data voltages;

a plurality of gate driving circuits connected to respective groups of gate lines and sequentially applying the gate-on voltage to the gate lines;

a data driver applying the data voltages to the data lines;

a duty ratio selector outputting a duty ratio selection signal informing a selected duty ratio; and

a signal controller controlling the plurality of gate driving circuits and the data driver based on the duty ratio selection signal,

wherein the signal controller determines a time for the pixels to receive the impulsive data voltage based on the duty ratio selection signal, and controls the plurality of gate driving circuits based on the determined time, and

wherein sum of the application durations of the normal data voltages and the impulsive data voltage adjacent to each other is equal to one horizontal period.