Head up visual display apparatus

Details Head up visual display apparatus Head up visual display apparatus

G - Physics

03

B

35/16, 88/68, 88

G03B 21/56 (2006.01)

Patent

CA 1119854

Improvements in or relating to Visual Display Apparatus Abstract The invention provides head-coupled area-of-interest visual display apparatus particularly for ground-based craft- flight simulators. The apparatus provides binocular vision of a display projected onto the inside of a part-spherical shell which surrounds the pilot and carries a concave retro- reflective screen. The display covers an area of interest determined by craft position and attitude and the viewer's instantaneous line of view. The image or images are projected from points horizontally in line but vertically displaced above the viewer's eye positions. If the retro- reflective screen material has a very small angle cone of reflection, light is reflected back to the projection point rather than to the viewer's eyes. The invention provides a screen reflection characteristic modified in all vertical planes by the use of an optical grating in combination with a highly retro-reflective screen material.

343517

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