Patent ID: 7446779

Claim:
A color signal correction apparatus that corrects color signals of red, green, and blue, which correspond to phosphors emitting red, green, and blue light, respectively, the apparatus comprising: a luminance characteristics correction unit that applies a correction of multiplying each color signal inputted thereto by an inverse function of saturation characteristics of the corresponding phosphor in order that the gradation characteristics of the phosphors become linear; and a chromaticity point correction unit (a) that comprises (1) an offset value calculating unit for calculating an offset value for suppressing variation of a chromaticity due to the correction process by the luminance characteristics correction unit on the basis of an inputted color signal of red and/or an inputted color signal of green, and (2) an offset value addition unit for adding the calculated offset value to an inputted color signal of blue, and (b) that outputs the inputted color signals of red and green and the corrected color signal of blue as output signals, wherein the offset value is relevant to an amount of miss-correction of Z-component in the correction process applied to the inputted color signals of red and/or green by the luminance characteristics correction unit.