Computer graphics processing and selective visual display system – Image superposition by optical means – Operator body-mounted heads-up display
Patent
1996-04-24
1999-05-04
Hofsass, Jeffery A.
Computer graphics processing and selective visual display system
Image superposition by optical means
Operator body-mounted heads-up display
345 7, 348 53, 273148B, G09G 500
Patent
active
059008490
ABSTRACT:
A collision warning system is for a head mounted display (HMD) (10) worn by a user, for example as the interface to a virtual reality system, to warn of nearby objects in the physical environment. A motion detector (30,32) detects positional changes of the HMD, which changes are reflected in changes of a displayed image viewpoint, and a comparator stage (38,40) determines whether the movement takes the user into a "prohibited" area. If so, a visual and/or audible warning is provided to the user via the HMD (10). In an embodiment, the display screens (18) of the HMD include liquid crystal display shutters (20) which are switched to a transparent state in the event of an imminent collision such that the user is not only warned of the danger but also able to see it without having to remove or adjust the HMD.
REFERENCES:
patent: 4695129 (1987-09-01), Faessen et al.
patent: 5621424 (1997-04-01), Shimada et al.
patent: 5641288 (1997-06-01), Zaenglein, Jr.
patent: 5662525 (1997-09-01), Yasumura et al.
Spear, "Virtual Reality", UK Patent Office Information Monographs Series, PIM 10, 1993, pp. 23-25.
Hofsass Jeffery A.
Lieu Julie B.
Renfrew, Jr. Dwight H.
U.S. Philips Corporation
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