| 摘要 |
A collision warning system is disclosed 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. 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.
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