High-reliability stacked waveguide with reduced sensitivity to pupil walk
AssigneeGoogle Inc.
InventorsJoseph Daniel Lowney, Ali Karbasi
Life of this patent
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Abstract
A first waveguide of a stacked waveguide located closest to the eye of a user operates in a reflection mode such that the set of grating structures of the first waveguide are disposed on a surface of the first waveguide opposite the eye of the user and towards the interior of the stacked waveguide. Additionally, a second waveguide of the stacked waveguide located further from the eye of the user operates in a transmission mode such that the grating structures of the second waveguide are disposed on a surface of the second waveguide facing the eye of the user and facing the interior of the stacked waveguide.
Claims20
A stacked waveguide, comprising:
- a first waveguide including a first set of grating structures disposed on a first surface of the first waveguide facing an interior of the stacked waveguide, the first set of grating structures forming a first incoupler configured to direct a first portion of received light into a body of the first waveguide so as to be guided by total internal reflection inside the body of the first waveguide;
- a first surface of the stacked waveguide formed from a second surface of the first waveguide opposite the first surface of the first waveguide;
- a second waveguide including a second set of grating structures disposed on a first surface of the second waveguide facing the interior of the stacked waveguide and the first surface of the first waveguide, the second set of grating structures forming a second incoupler configured to direct a second portion of received light into a body of the second waveguide so as to be guided by total internal reflection inside the body of the second waveguide;
- and
- a second surface of the stacked waveguide formed from a second surface of the second waveguide opposite the first surface of the second waveguide, the second surface of the stacked waveguide opposite the first surface of the stacked waveguide.
A wearable display, comprising:
- an optical engine;
- and
- a stacked waveguide comprising:
- a first waveguide including a first set of incoupler gratings disposed on a first surface of the first waveguide, the first set of incoupler gratings configured to direct a first portion of light emitted by the optical engine into a body of the first waveguide so as to be guided by total internal reflection inside the body of the first waveguide;
- a first surface of the stacked waveguide formed from a second surface of the first waveguide opposite the first surface of the first waveguide;
- a second waveguide including a second set of incoupler gratings on a first surface of the second waveguide facing the first surface of the first waveguide, the second set of incoupler gratings configured to direct a second portion of light emitted by the optical engine into a body of the second waveguide so as to be guided by total internal reflection inside the body of the second waveguide;
- and
- a second surface of the stacked waveguide formed from a second surface of the second waveguide opposite the first surface of the second waveguide, the second surface of the stacked waveguide opposite the first surface of the stacked waveguide.
Dependencies are inferred from the claim text.