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Illuminator for a wearable display

  • US 10,386,563 B2
  • Filed: 07/15/2017
  • Issued: 08/20/2019
  • Est. Priority Date: 06/21/2016
  • Status: Active Grant
First Claim
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1. A see-through display system comprising:

  • a display device comprising a LCOS with a circuit to drive the LCOS;

    an eyeglass lens and a temple;

    a see-through optical element comprises a group of holographic optical element (HOE) and diffractive optical element (DOE) attached to the eyeglass lens;

    a projection optics embedded in the temple having at least one lens with at least one free form surface and at least one mirror projecting image light beams through air to the eyeglass;

    an illuminator comprising a light source of multiple colors having light emitting device(s) from a group of Laser, LED, OLED and phosphor activated by a solid state light source;

    an optical combiner combining the light sources of multiple colors into a single beam wherein said combiner is from a group of dichroic prism, PBS, optical fiber, free form lenses, DOE, HOE and planar light waveguide circuit and Total Internal Reflection (TIR) prism wherein the incident angle of said combined light beam onto said display device is larger than 10 degrees; and

    the LCOS comprises a cubic polarized beam splitter (PBS) that includes two triangular prisms having a layer of polarizer on a splitter face and a ¼

    λ

    retarder parallel to the LCOS display surface and on the opposite side of face of said PBS from LCOS, so that a single PBS can transmit necessary image light to a projection lens.

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