According to one embodiment, a liquid crystal display device includes a driving module configured to apply a DC bias to a voltage corresponding to a gradation which is displayed on a pixel and to supply a resultant voltage to a pixel electrode, the driving module being configured to apply a higher DC bias in a white display state in which a potential difference is produced between a pixel electrode and a common electrode than in a black display state in which no potential difference is produced between the pixel electrode and the common electrode.