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Femtoprojector optical systems, used in eye-mounted display

  • US 10,690,917 B2
  • Filed: 11/02/2017
  • Issued: 06/23/2020
  • Est. Priority Date: 10/31/2016
  • Status: Active Grant
First Claim
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1. An eye-mounted display comprising:

  • a contact lens mountable on a user'"'"'s eye; and

    one or more femtoprojectors in the contact lens, at least one of the femtoprojectors comprising;

    an image source that produces an image; and

    a femtoprojector optical system comprising;

    a convex first mirror facing the image source, where image-forming rays from the image source are incident on and reflected by the first mirror and stray rays from the image source are not incident on the first mirror;

    a concave second mirror having a center opening to accommodate the image source, the second mirror having a lateral dimension that is larger than the first mirror and also larger than the image source, the second mirror facing the first mirror and further reflecting the image-forming rays from the first mirror, the first mirror and the second mirror cooperating to project the image from the image source;

    wherein the image source, the first mirror and the second mirror are axially aligned along a common axis, and a distance along the common axis from the image source to the second mirror is less than a distance from the second mirror to the first mirror; and

    a light baffle system that includes an obscuration adjacent to and surrounding the first mirror, the obscuration blocking stray rays from the image source that are not reflected by the first mirror.

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