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Head-up displays

  • US 4,407,564 A
  • Filed: 01/21/1981
  • Issued: 10/04/1983
  • Est. Priority Date: 01/22/1980
  • Status: Expired due to Fees
First Claim
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1. A display unit for a head up display comprising a combiner through which an observer can view a scene and a projector unit having a display surface from which light representing a display is projected onto the combiner for reflection to the observer thereby to provide the observer with an image of the display superimposed on his view through the combiner, characterised in that the combiner has first, second and third tuned reflective optical films which converge towards one another so as to define a pair of tapering spaces;

  • the reflection/transmission characteristics of the films and the angles of convergence of the films and their angular relationship with the display surface being such that light within a narrow waveband from the display surface is, in turn, reflected at the first film towards the second film, transmitted through the second film towards the third film, reflected at the third film back towards the second film, reflected at the second film towards the third film, and transmitted through the third film to the observer'"'"'s viewing position.

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