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Heads-up display combiner utilizing a cholesteric liquid crystal element

  • US 4,900,133 A
  • Filed: 10/27/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 10/27/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for positioning images in an observer'"'"'s line-of-sight, wherein projected images from an image source are reflected by a liquid crystal element acting as a combiner to combine the projected images with images in the line-of-sight of the observer, comprising:

  • an image source, having selected primary wavelengths, for projecting symbology; and

    a liquid crystal element reflective to images at said selected primary wavelengths, and transmissive to images at all other wavelengths.

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