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Holographic head-up display apparatus

  • US 4,932,731 A
  • Filed: 07/10/1989
  • Issued: 06/12/1990
  • Est. Priority Date: 11/14/1986
  • Status: Expired due to Term
First Claim
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1. A holographic head-up display apparatus which comprises:

  • (a) light emitting display means for generating visible display light;

    (b) transmissive hologram diffraction grating means for transmissively diffracting the visible display light emitted from said light emitting display means;

    (c) reflective hologram diffraction grating means for reflectively diffracting the visible display light transmissively diffracted through said transmissive hologram diffraction grating means toward an observer so that the observer can recognize a clear virtual image free from chromatic aberration of the visible display light emitted from said light emitting display means.

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