Patent ID: 7511690

Claim:
A display device, comprising: a signal analyzing portion categorizing a plurality of image signals, each of which includes red-color, green-color, and blue-color signals, as belonging to one of first and second signal regions, and detecting if a number of image signals out of the plurality of image signals belonging to the first signal region is more than that belonging to the second signal region or if a number of image signals out of the plurality of image signals belonging to the second signal region is more than that belonging to the first signal region; and means for driving an image display portion in a first manner if the number of image signals out of the plurality of image signals belonging to the first signal region is more than that belonging to the second signal region, and driving the image display portion in a second manner if the number of image signals out of the plurality of image signals belonging to the second signal region is more than that belonging to the first signal region, the image display portion including a plurality of pixels, each of the pixels having red-color, green-color, blue-color, and white-color sub-pixels, the pixels corresponding to the image signals, wherein driving the image display portion in the first manner includes amplifying the plurality of image signals and emitting light having a first luminance to the image display portion, and driving the image display portion in the second manner includes amplifying the plurality of image signals and emitting light having a second luminance to the image display portion, the first and second signal regions being a constant scaling space (CSS) signal region and a gamut scaling space (GSS) signal region, respectively, the first luminance less than the second luminance.