Patent ID: 7918566

Claim:
An image display apparatus comprising: a screen on which images are projected; a first projector arranged on front surface side of the screen that is configured such that a projection range thereof corresponds to a display region of the screen, and projects a first image to the display region from the front surface side of the screen; a second projector arranged on the rear surface side of the screen that is configured such that a projection range thereof corresponds to the display region of the screen, and projects a second image which is a reverse of the first image with the display region of the screen from the rear side of the screen; an image recording portion that records the display region; a first detecting portion that compares respective pixels in identical positions of the image of the display region obtained by the image recording portion and the second image to be displayed by the second projector, and detects a portion of the display region corresponding to an image composed of pixels having a difference of the compared pixel values that exceeds a predetermined value as a shielding region; and a controller that transmits the first image and position information to the first projector to project the first image to the display region of the screen when the shielding region is detected by the detecting portion, the position information being able to uniquely identify a projection position in the display region of the screen; wherein the first image projected from the front surface side of the screen and second image projected from the rear surface side of the screen are the same within a portion of the display region where both the first image and the second image are displayed.