Waveguide grating device
AssigneesDigiLens Inc., Rockwell Collins, Inc.
InventorsJonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, James H. Stanley, Robert D. Brown
Life of this patent
Estimating the term…
Abstract
An optical waveguide display comprises: a waveguide; a source of light modulated with temporally-varying angularly-distributed information; a fold grating providing a first beam expansion; an input coupler for directing light into total internal reflection paths in a first propagation direction; and an output grating for providing a second beam expansion and extracting light from the waveguide. The input light undergoes at least two diffractions within the fold grating, each diffraction directing light into a unique total internal reflection angular range along a second propagation direction.
Claims20
An optical waveguide display comprising:
- a waveguide;
- a source of light modulated with temporally-varying angularly-distributed information;
- a fold grating of a first prescription disposed in said waveguide;
- an input coupler for directing said light into total internal reflection (TIR) paths in a first propagation direction in said waveguide;
- and
- an output grating for extracting said light from said waveguide,
- said fold grating providing a first beam expansion, said output grating providing a second beam expansion, wherein said fold grating diffracts light in said first propagation direction into a second propagation direction, wherein light in a first TIR angular range in said first propagation direction undergoes at least two diffractions within said fold grating, wherein each ray from said first angular range and its corresponding diffracted rays lie on a diffraction cone of said fold grating, wherein each diffraction provides a unique TIR angular range along said second propagation direction.
Dependencies are inferred from the claim text.