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Adding prescriptive correction to eyepieces for see-through head wearable displays

  • US 10,146,054 B2
  • Filed: 07/06/2015
  • Issued: 12/04/2018
  • Est. Priority Date: 07/06/2015
  • Status: Active Grant
First Claim
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1. An eyepiece for a head wearable display, the eyepiece comprising:

  • a curved lightguide component for guiding display light received at an input region peripherally located from a viewing region and releasing the display light along an eye-ward direction in the viewing region, the curved lightguide component having an eye-facing side and a world-facing side, wherein the curved lightguide component has a thick portion that extends across a part of the eyepiece then transitions to a thin portion that extends across a remainder of the eyepiece, wherein the thick portion and the thin portion are of constant width along a chord line extending from an input coupler to an output coupler for at least a non-zero distance, and wherein the curved lightguide component extends across the eyepiece;

    the output coupler disposed where the thick portion of the curved lightguide component transitions to the thin portion of the curved lightguide component to redirect the display light towards the eye-ward direction for output from the curved lightguide component, wherein the output coupler is at least partially transmissive to ambient light incident through the world-facing side such that the viewing region is see-through;

    a curved see-through component mated to the world-facing side of the curved lightguide component; and

    a prescription layer having a first side and a second side, wherein the first side is mated to the eye-facing side of the curved lightguide component and the second side has a curvature that introduces prescriptive lensing to both the ambient light and the display light exiting the eyepiece in the viewing region.

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