Amazon patents AR glasses lens that stacks light layers for brighter images

1. An optical waveguide system comprising: an optical waveguide substrate; a first injection holographic layer coupled to the optical waveguide substrate, the first injection holographic layer having a first surface and a second surface opposite and parallel to the first surface, the first injection holographic layer configured to receive a light beam at the first surface and inject a first portion of the light beam into the optical waveguide substrate by at least diffracting the first portion from the first surface at a diffraction angle relative to a surface of the optical waveguide substrate, the first portion representing a first image, a remaining portion of the light beam being output from the second surface; a second injection holographic layer coupled to the optical waveguide substrate, separated from the first injection holographic layer by a distance, the second injection holographic layer having a third surface that is parallel to the first surface and that is separated from the second surface by the distance, the second injection holographic layer configured to receive the remaining portion of the light beam at the third surface and inject a second portion of the light beam into the optical waveguide substrate by at least diffracting the second portion from the third surface at the diffraction angle such that the second portion propagates within the optical waveguide substrate along a propagation path parallel to that of the first portion, the second portion representing a second image that is a duplicate of the first image; and an extraction holographic layer coupled to the optical waveguide substrate and configured to extract the first portion and the second portion from the optical waveguide substrate as an output light beam, the output light beam representing an image that is a duplicate of the first image and that is brighter in luminosity than the first image or the second image individually.