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Display systems

  • US 4,042,957 A
  • Filed: 11/19/1975
  • Issued: 08/16/1977
  • Est. Priority Date: 11/29/1974
  • Status: Expired due to Term
First Claim
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1. A head-up display unit having:

  • at least a part so disposed, when in used in a vehicle, as to intercept the line of sight of an observer using the unit to view a scene lying ahead of him;

    a light deflecting arrangement which enables the observer to see said scene substantially as if said part of the display unit were absent;

    a source of luminous signals; and

    optical means for projecting light rays from the source of luminous signals into the light deflecting arrangement so as to be deflected by said light deflecting apparatus thereby to be coincident with, and thence to follow substantially the same optical path through the light deflecting arrangement as rays originating from said scene so to present to the observer using the unit a collimated display of said luminous signal source within his angular field of view of the said scene.

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