Patent ID: 8643782

Claim:
An image display device, comprising: a receiving section that acquires an external vertical synchronizing signal superimposed on a digital signal which is input; an image generating section that outputs image data based on the digital signal; a control section that controls the image generating section so that the image generating section outputs the image data that is based on the digital signal in synchronization with the external vertical synchronizing signal; an adjusting section that makes an adjustment to the digital signal based on setting information; and an information inputting section to which a display instruction to display a setting image for assisting a change of the setting information is input, wherein the image generating section internally generates an internal vertical synchronizing signal, and when the display instruction is input, the control section controls the image generating section so that the image generating section: outputs the image data that is based on the digital signal in synchronization with the internal vertical synchronizing signal instead of the external vertical synchronizing signal, and outputs the setting image such that the setting image is superimposed on a displayed image corresponding to the image data that is based on the digital signal that is output in synchronization with the internal vertical synchronizing signal, following receipt of input directing a change of the setting information and prior to receipt of input confirming the change of the setting information, at least a portion of the displayed image is output so as to be visible when the setting image is superimposed on the displayed image.