Patent ID: 7330190

Claim:
A correction characteristic determining device for determining a correction characteristic in a display device which corrects an image signal, and displays an image in display means in accordance with thus corrected image signal, said correction characteristic determining device comprising: target curve setting means for setting a target curve indicative of a relationship between a gray scale value of the image signal that has not been corrected and target output brightness, corresponding to the gray scale value, that should be displayed in the display means; gray scale adjusting means for setting an adjustment parameter by subtracting an actual brightness value, obtained when the display means displays a lowest gray scale, from lowest target output brightness corresponding to a lowest gray scale value of the image signal in the target curve, and for adjusting the target curve by subtracting the adjustment parameter from at least target output brightness in the target curve which is less than the actual brightness value; and gray scale value converting means for determining a relationship between the gray scale value, that has not been corrected, and the gray scale value, that has been corrected, in the image signal, in accordance with the target curve that has been adjusted by the gray scale adjusting means.