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Optical combiner for near-eye display

  • US 8,947,783 B2
  • Filed: 01/02/2013
  • Issued: 02/03/2015
  • Est. Priority Date: 01/02/2013
  • Status: Active Grant
First Claim
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1. An optical combiner having an eye-ward side and an external scene side, the optical combiner comprising:

  • a first color combiner layer (“

    CCL”

    ) including a first diffractive grating coated with a first filter configured to reflect a first color light and pass a second and a third color light;

    a second CCL including a second diffractive grating coated with a second filter configured to reflect the second color light and pass the third color light; and

    a third CCL including a third diffractive grating coated with a third filter configured to partially reflect visible light, wherein the first, second, and third diffractive gratings are each embedded in an index matched material and are angle-tuned diffractive gratings configured to receive image light at an angle and respectively reflect the first, second, and third color light in the image light at an order of diffraction that directs the first, second, and third color light in a direction substantially normal to an eye of a user to present images to the user, and wherein the index matched material is disposed between the first filter and the second filter and the index matched material is also disposed between the second filter and the third filter.

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