Liquid crystal display device and method of driving the same

摘要

A first substrate includes a first switching element arranged in a first color pixel and a second switching element arranged in a second color pixel of which color is different from the color of the first color pixel in an active area. A driving unit superimposes DC bias voltages on voltages corresponding to gradations to be displayed in the first color pixel and the second color pixel, and to supply the superimposed voltages to the first pixel electrode and the second pixel electrode, respectively. A first halftone gradation voltage obtained by superimposing a first DC bias voltage on a voltage corresponding to a halftone gradation is supplied to the first pixel electrode. A second halftone gradation voltage obtained by superimposing a second DC bias voltage different from the first DC bias voltage on a voltage corresponding to the halftone gradation is supplied to the second pixel electrode.

主权项

1. A liquid crystal display device, comprising:
a first substrate including a first switching element arranged in a first color pixel and a second switching element arranged in a second color pixel of which color is different from the color of the first color pixel in an active area, a common electrode arranged in the first color pixel and the second color pixel, an insulating film arranged on the common electrode, first and second pixel electrodes arranged on the insulating film in the first and second color pixels and electrically connected with the first and second switching elements, respectively, and a first alignment film covering the first pixel electrode and the second pixel electrode; a second substrate including a second alignment film facing the first alignment film; a liquid crystal layer held between the first alignment film and the second alignment film; and a driving unit to superimpose DC bias voltages on voltages corresponding to gradations to be displayed in the first color pixel and the second color pixel, and to supply the superimposed voltages to the first pixel electrode and the second pixel electrode, respectively; wherein a first halftone gradation voltage obtained by superimposing a first DC bias voltage on a voltage corresponding to a halftone gradation to be displayed is supplied to the first pixel electrode, wherein a second halftone gradation voltage obtained by superimposing a second DC bias voltage different from the first DC bias voltage on a voltage corresponding to a halftone gradation to be displayed is supplied to the second pixel electrode, and wherein the first and second half tone gradation voltages supplied to the first and second pixel electrodes are respectively formed of asymmetric rectangular wave voltages with respect to positive and negative polarities.