Patent ID: 7671821

Claim:
An image display apparatus, comprising: an image signal receiving circuit receiving a signal including an image signal representing series of frames, a synchronizing signal, and an index signal provided for each frame and placed in a part of certain picture elements corresponding to image data of the image signal; an index detector detecting the index signal, the index signal being a defined number of pixels of the image signal, each of which are one of two logical states determined by the displayed luminance characteristic of each pixel, where the pixels representative of the index signal are set to a logical high state when said pixels have a luminance value above a defined threshold or logical low state when said pixels have a luminance value below said defined threshold, where each of said pixels of said index signal correspond to a specified display unit; a frame selection unit selecting a frame to be displayed according to the combination of logical states of each of said pixels representative of the index signal; and a display unit displaying at least a part of the frame selected by the frame selection unit.