Provided is a gate driver for use in a display panel. The gate driver includes a chamfering module configured to receive gate turn-on voltage signals and square wave controlling signals and chamfer the gate turn-on voltage signals in accordance with the square wave controlling signals to generate and output chamfered gate turn-on voltage signals, and a level shifting module configured to receive the chamfered gate turn-on voltage signals, input voltage signals and gate cut-off voltage signals, and output the chamfered gate turn-on voltage signals or the gate cut-off voltage signals in accordance with a voltage value of the input voltage signal. By integrating a chamfering module and a digital adjustable resistance module into a gate driver, it is not necessary to provide a chamfering circuit on a CB of display panel, so as the CB can be miniaturized.