Patent ID: 8514334

Claim:
An image display device comprising: a color display unit for displaying a color image; a look-up table which stores correction data for correcting color balance of the color image to be displayed on the color display unit; look-up table recalculating means for recalculating the correction data in the look-up table; and look-up table updating means for updating the correction data in the look-up table to the correction data recalculated by the look-up table recalculating means, wherein the correction data in the look-up table represents a relationship between a pre-correction value representing a pre-correction brightness level of each of colors including red, green and blue and a post-correction value representing a brightness level to be output after correcting the pre-correction value, wherein an input signal value representing a brightness level of each of colors including red, green and blue in an input image data is corrected based on the correction data in the look-up table so that the color display unit displays a color image based on the corrected input signal value on the color display unit, and wherein assuming that x denotes the pre-correction value, y=F(x) denotes the post-correction value before recalculation by the look-up table recalculating means, and y=G(x) denotes the post-correction value after recalculation by the look-up table recalculating means, the look-up table recalculating means recalculates the post-correction value in the look-up table as: y=G(x)=F((α×GainH+(1−α)×GainL)×x) in the range of InL<x<InH, and where α=(x−InL)/(InH−InL), and where InL, InH, GainL and GainH denote: InL: input signal value of image data of a lower brightness white balance adjustment image which is one of at least two white balance adjustment images with a lower brightness level, InH: input signal value of image data of a higher brightness white balance adjustment image which is another one of the at least two white balance adjustment images with a higher brightness level, GainL: gain value provided to the input signal value InL of the image data of the lower brightness white balance adjustment image so as to bring the color balance of the lower brightness white balance adjustment image to a predetermined color balance, and GainH: gain value provided to the input signal value InH of the image data of the higher brightness white balance adjustment image so as to bring the color balance of the higher brightness white balance adjustment image to a predetermined color balance.