A method of driving a display panel includes generating a clock signal including a high period which includes a first horizontal period having a first level, a second horizontal period having a second level smaller than the first level, and a third horizontal period having the first level, and a low period having a third level, generating a gate signal which includes the first level in the first horizontal period, the second level in the second horizontal period, and the first level in the third horizontal period based on the clock signal, and charging a data voltage to a pixel of the display panel in response to the gate signal.