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Display apparatus

  • US 5,089,903 A
  • Filed: 06/01/1989
  • Issued: 02/18/1992
  • Est. Priority Date: 06/03/1988
  • Status: Expired due to Term
First Claim
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1. A display apparatus comprising:

  • a display;

    a first diffraction grating for diffracting light emitted from said display, said first diffraction grating having a diffraction efficiency with a first wavelength spectrum and the diffracted light having a center wavelength; and

    a second diffraction grating for diffracting diffracted light from said first diffraction grating toward a pupil of an observer, with a half-width of the first wavelength spectrum of said first diffraction grating being larger than a sum of a half-width of a second wavelength spectrum of a diffraction efficiency of said second diffraction grating and a variation amount of the center wavelength of the diffracted light directed toward the pupil, wherein the variation amount varies in accordance with variation of the position of the pupil.

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