An exemplary liquid crystal display (20) includes gate lines (21), a gate driver (25) configured for receiving input signals, a comparator (28), a reference voltage generator (29) configured for outputting a reference voltage to the comparator, and a timing control circuit (27). The gate driver is further configured for driving the gate lines. Falling edges of waveforms of the input pulse signals drop gradually from a first voltage to a second voltage. The comparator is configured for receiving the input pulse signals and the reference voltage, and outputting a control signal according to the input pulse signals and the reference voltage. The timing control circuit is configured for receiving the control signal from the comparator, and, according to the control signal, outputting output enable signals to the gate driver to adjust gate signals applied to the gate lines.