The invention provides head-coupled area-of-interest visual display apparatus particularly for ground-based craft-flight simulators. The apparatus provides binocular, pseudo-collimated vision of a display, projected onto a part-spherical retro-reflective screen, for two pilots, covering an area of interest...http://www.google.fr/patents/US4347507?utm_source=gb-gplus-shareBrevet US4347507 - Visual display apparatus
