Patent ID: 6927784

Claim:
An image display system which corrects and displays an image, based on environmental information that represents a viewing environment, the image display system comprising: correction display means for displaying a first calibration image represented by first image signal and also displaying a second calibration image represented by second image signal that is different from the first image signal; sensor means for sensing the displayed first calibration image, the displayed second calibration image, and a display area of a normal image and a non-display area around the display area, and outputting first environmental information, second environmental information, and third environmental information, respectively; area identification means for identifying the display area and the non-display area, based on the first environmental information and the second environmental information; brightness change derivation means for storing one of the first and second environmental information of the non-display area as initial environmental information, and also for deriving brightness change information that expresses a change in brightness concomitant with a change in a viewing environment, based on a difference between the third environmental information and the initial environmental information; grayscale correction parameter derivation means for deriving a grayscale correction parameter, based on an average luminance value of each pixel in the display area during the displays of the first and second calibration images in an ideal environment and an average luminance value of each pixel in the display area during the displays of the first and second calibration images in the actual environment, which is based on the first and second environmental information; and correction data generation means for generating correction data which is used for correcting the brightness of an image, based on the grayscale correction parameter, wherein the grayscale correction parameter derivation means re-derives the grayscale correction parameter, based on the brightness change information, at a time-point at which a predetermined time has elapsed or a time-point at which a predetermined change has occurred in the third environmental information, wherein the correction data generation means regenerates the correction data, based on the grayscale correction parameter, and wherein the correction display means corrects and displays an image based on the correction data.