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Virtual image display device

  • US 5,999,147 A
  • Filed: 11/28/1997
  • Issued: 12/07/1999
  • Est. Priority Date: 07/03/1991
  • Status: Expired due to Term
First Claim
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1. A head-coupled display device for use in presenting electronically generated visual images to a viewer, comprising:

  • a headpiece adapted to be worn by the viewer;

    an image display screen mounted in the headpiece for presenting the electronically generated images to the viewer; and

    a fresnel lens mounted in the headpiece for focusing the electronically generated images from the image display screen at a selected position for viewing, wherein one side of the fresnel lens includes a grooved surface, and wherein the fresnel lens is positioned such that the grooved surface is closer to the image display screen than an opposite surface of the fresnel lens.

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