Patent ID: 9329388
Filing Date: 2016-05-03
CPC Classification: G02B

Claim Text:
1. An apparatus for implementing a heads-up display, the apparatus comprising: a substrate that is substantially transparent; a diffraction grid of reflective scattering elements disposed along a surface of the substrate; and interstitial regions disposed between adjacent ones of the reflective scattering elements of the diffraction grid, the interstitial regions being substantially transparent to pass external light from a first side of the substrate through to a second side of the substrate, wherein the diffraction grid of reflective scattering elements diffracts a heads-up display image to the second side of the substrate in response to laser light directed onto the diffraction grid from the second side of the substrate and wherein the heads-up display image is superimposed over an external scene originating from the first side of the substrate, wherein the diffraction grid of reflective scattering elements is a non-uniform pattern of the reflective scattering elements that generates a fixed image via diffraction in response to uniform illumination by the laser light, wherein optical paths through the apparatus for the external light incident from the first side of the substrate are more transparent when incident through the interstitial regions than when incident through the reflective scattering elements.