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Head wearable display using powerless optical combiner

  • US 10,459,228 B1
  • Filed: 05/28/2014
  • Issued: 10/29/2019
  • Est. Priority Date: 05/28/2014
  • Status: Active Grant
First Claim
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1. An optical apparatus for a head wearable display, comprising:

  • a lightguide to receive, at a first side of the lightguide, display light having an initial cross-section size into the lightguide and guide the display light down the lightguide, wherein the lightguide includes a first plurality of reflective optical elements that redirect the display light out of a second side of the lightguide with an expanded cross-section size that is larger than the initial cross-section size, wherein the first plurality of reflective optical elements comprise a linear array of planar surfaces offset from each other and obliquely oriented relative to the second side; and

    an optical combiner separate from, and obliquely oriented relative to, the lightguide, the optical combiner to combine the display light having the expanded cross-section with ambient scene light, the optical combiner including;

    an ambient scene side;

    an eye-ward side; and

    a second plurality of reflective optical elements that pass at least a portion of the ambient scene light incident along an eye-ward direction on the ambient scene side through to the eye-ward side and redirect the display light having the expanded cross-section and incident on the eye-ward side to the eye-ward direction, wherein the second plurality of reflective optical elements comprise a linear array of planar surfaces offset from each other and obliquely oriented relative to the ambient and eye-ward sides, and wherein the second plurality of reflective optical elements are substantially without lensing power.

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