Patent ID: 8416495

Claim:
A display apparatus comprising a movably installed hemispherical rear projection screen, a projector for projecting an image onto the inner surface of the hemispherical rear projection screen to be displayed on the outer surface of the rear projection screen, and a computer system for creating an image projected from the projector, wherein the computer system comprises a recording medium for storing image data of a plane image, creation means for correcting image data stored to the recording medium and creating image data of a curved image, and transmission means for transmitting the image data of the curved image created by the creation means to the projector, and wherein the display apparatus further comprises one or a plurality of plane reflection means disposed between the projector and the inner surface of the hemispherical rear projection screen that reflect a luminous flux output from the projector onto the inner surface of the rear projection screen, and wherein the display apparatus further comprises detection means capable of detecting displacement of the rear projection screen, and the computer system reads, when the rear projection screen is displaced, image data corresponding to the displacement of the rear projection screen from the image data stored in the recording medium in response to signals output from the detection means, creates image data of a curved image by correcting the image data by the creation means, and transmits the image data of the created curved image to the projector by the transmission means, and wherein the detection means are composed of two-axis displacement sensors and disposed in at least three portions at predetermined intervals.