A gate driver for use in a liquid crystal display has a plurality of shift registers connected in series. Each of the shift registers is used to provide a gate-line pulse to a row of pixels in the liquid crystal display. The gate-line pulse has a front pulse and a rear pulse and the shift register has a front-pulse generating part and a rear-pulse generating part for generating to corresponding pulse. Each of the pulse generating parts has a first pull-up circuit to generate a voltage level to keep a switching element in a second pull-up circuit conducting so as to generate a front or rear pulse, in response to a corresponding clock signal, and two pull-down circuits, in response to the voltage level, to allow the front or rear pulse to be generated only at a pull-down period.