Liquid crystal display device control circuit and liquid crystal display system, which adjust brightness of display image by using height distribution of gradations of input image

摘要

A liquid crystal display control circuit includes a current reduction rate setting circuit analyzes original gradations of pixels in an input image signal and sets a current reduction rate; a light emitting element control circuit adjusts a drive current of the light emitting element in response to the current reduction rate; a gradation changing circuit generates a display image signal in which the original gradations are changed to the display gradations; and a liquid crystal panel control circuit sets a transmittance of the liquid crystal panel in response to the display gradations of pixels included in the image display signal.