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Head-mounted display apparatus employing one or more Fresnel lenses

  • US 10,495,790 B2
  • Filed: 12/04/2015
  • Issued: 12/03/2019
  • Est. Priority Date: 10/21/2010
  • Status: Active Grant
First Claim
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1. A direct view head-mounted display apparatus comprising:

  • a frame adapted to be mounted on a head of a nominal user, the frame configured to position an image display system in front of an eye of the nominal user; and

    a Fresnel lens system supported by the frame and positioned between the image display system and the eye of the nominal user, the Fresnel lens system configured to project images from the image display system onto a wider field of view for the nominal user than a field of view physically occupied by the image display system, the Fresnel lens system comprising;

    a first curved Fresnel lens that is symmetrical about an axis that extends perpendicularly from a center point of the first curved Fresnel lens, wherein the first curved Fresnel lens is curved along two dimensions and has a spherical shape; and

    a second curved Fresnel lens that is symmetrical about an axis that extends perpendicularly from a center point of the second curved Fresnel lens, wherein the second curved Fresnel lens is curved along two dimensions and has a spherical shape, and wherein the first curved Fresnel lens and the second curved Fresnel lens are positioned in a stacked relationship wherein light emitted from the image display system passes through the first curved Fresnel lens and the second curved Fresnel lens;

    and wherein a light path from the image display system to the eye of the nominal user is devoid of any reflective optical elements.

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