According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer, scanning lines, signal lines, pixel switches, first electrodes, a scanning line drive circuit, a second electrode, a voltage supply wiring, a control mechanism, a first switching mechanism, a second switching mechanism, and an output timing switching mechanism. The output timing switching mechanism is configured to simultaneously output a second scanning signal of switching the pixel switch into conductive state to the scanning lines, based on the control signal.