Patent ID: 7969455

Claim:
An image display device for displaying an image on the basis of an image signal supplied from an image supply device comprising: a brightness detecting section that detects and obtains, directly from a pattern image signal, a gray level which characterizes brightness of a plurality of grayscale areas respectively of a plurality of predetermined pattern images of the pattern image signal when the plurality of predetermined pattern images are supplied from the image supply device, each of the plurality of the predetermined pattern images including the plurality of grayscale areas on one frame and each area being set to a predetermined gray level; a storing section that stores a reference gray level predetermined in each of the plurality of predetermined pattern images; a correction parameter setting section that sets a correction parameter for compensating by a difference between the gray level detected by the brightness detecting section and the reference gray level stored in the storing section; and a correcting section that corrects the brightness of the image signal supplied from the image supply device on the basis of the correction parameter, wherein the brightness detecting section sets regions of the plurality of grayscale areas as detection areas that are smaller than their corresponding grayscale area and detects gray levels for the respective detection areas, and detects and obtains, directly from a synchronizing signal, positional information of a brightness parameter in regions of the plurality of grayscale areas, and at least one area of the plurality of grayscale areas of at least one of the plurality of predetermined pattern images is set to a different predetermined gray level than the level of at least another area of the plurality of grayscale areas of the at least one of the plurality of predetermined pattern images.