Patent ID: 7209135

Claim:
An image display apparatus that includes a video display that displays an optical image based on an input signal, and a video signal adjusting device that adjusts a display setting of said video display based on a signal mode of said input signal, said image display apparatus comprising: a determining device that causes said video display adjusting device to adjust the display setting of said video display when said input signal changes, said display setting of said video display including tracking information for the horizontal synchronization adjustment of said video display, said determining device including: a signal change detector unit that detects the change in said input signal; a signal mode memory device that stores a signal mode information used by said video display prior to change in said input signal, said signal mode information including said tracking information; a comparator unit that retrieves said tracking information of said input signal subsequent to the change in said input signal, and compares said tracking information with tracking information of the display setting data stored in said signal mode memory device; and a pre-change signal detector unit that determines a presence or absence of an input signal prior to the change in said input signal, wherein when said pre-change signal detector unit determines an absence of an input signal prior to the signal change, said determining device determines whether to cause said video display adjusting device to adjust the display setting, based on a comparison result provided by said comparator unit.