Patent ID: 8743037

Claim:
A color field-sequential liquid crystal display device comprising: a liquid crystal panel; a planar light-source unit for emitting light toward said liquid crystal panel; and a signal processor connected to said liquid crystal panel and to said planar light-source unit; wherein said signal processing includes: a comparing unit that compares whether a difference in gray levels between gray-level signals of video signals located at the same time or spatial position from the beginning of said subframe among the subframes of the same color in each frame of two mutually adjacent video frames is not less than a prescribed value; and a polarity reversing unit that makes potentials of video signals in mutually adjacent subframes within the same frame go up and down to a prescribed potential, reversing all of the video signals of the one frame by centering on the prescribed potential, and outputting all of the video signals of the one frame to said liquid crystal panel in a case where the difference in gray levels is not less than the prescribed value, and outputting all of the video signals of the one frame without change to said liquid crystal panel in a case where the difference in gray levels is less than the prescribed value based upon the result of the comparison by said comparing unit.