a gate driver and a display device , which relate to the technical field of display , and are applicable to the design and manufacture of display devices . the gate driver comprises : a power - off voltage detection circuit and a power - off de - ghosting function circuit connected to the power - off voltage detection circuit , wherein the power - off voltage detection circuit is used for detecting a current voltage state , and outputting a control signal to the power - off de - ghosting function circuit according to the voltage state , so that the power - off de - ghosting function circuit outputs a signal to eliminate power - off ghosting according to the control signal . the gate driver integrates the power - off voltage detection circuit and the power - off de - ghosting function circuit ; the integration level is high , and the display device can eliminate the power - off ghosting without the need to match the selected type of the gate driver and a printed circuit board .