Patent ID: 7130119

Claim:
A 3-D observation apparatus comprising a 3-D display apparatus, another display apparatus, and at least one display panel wherein: said 3-D display apparatus is provided with at least two projection devices; said two projection devices are each provided with an opening, and are positioned so that images are projected onto a surface of said at least one display panel through the two openings; each said at least one display panel is provided with an image-forming element so that images of said openings, and an image of an opening of at least one additional projection device that is associated with said another display apparatus, are formed at observation pupils; the observation pupils of said 3-D display apparatus overlap the observation pupil of said another display apparatus so that it allows to observe simultaneously both of the images formed on said at least one display panel by the 3-D display apparatus and either (a) an image that is projected onto a different part of the surface of said at least one display panel by said another display apparatus, or (b) an image that is projected onto a surface of another display panel by said another display apparatus; and the light at said observation pupils of said 3-D display apparatus from images projected onto said surface of the at least one display panel by the 3-D display apparatus intersects at a non-zero angle the light from the image that is projected onto a surface according to alternatives (a) or (b) above by said another display apparatus so that the 3-D image from the 3-D display apparatus and the image from said another display apparatus are viewable as different real images in a non-superimposed state.