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US 12,379,547 B2Granted
Waveguide grating device
AssigneesDigiLens Inc., Rockwell Collins, Inc.
InventorsJonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, James H. Stanley, Robert D. Brown
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Abstract
An optical waveguide comprises at least two TIR surface and contains a grating. Input TIR light with a first angular range along a first propagation direction undergoes at least two diffractions at the grating. Each diffraction directs light into a unique TIR angular range along a second propagation direction.
Claims22
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 configured as an evanescently coupled layer in proximity to the waveguide;
- an input coupler for directing the light into total internal reflection (TIR) paths in a first propagation direction in the waveguide;
- and
- an output grating for extracting the light from the waveguide,
- wherein the fold grating provides a first beam expansion and diffracts light in the first propagation direction into a second propagation direction,
- wherein the output grating provides a second beam expansion,
- wherein light in a first TIR angular range in the first propagation direction undergoes at least two diffractions within the fold grating,
- wherein each ray from the first angular range and its corresponding diffracted rays lie on a diffraction cone of the fold grating,
- wherein each diffraction provides a unique TIR angular range along the second propagation direction.
8 more elements
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 configured as an evanescently coupled layer in proximity to the waveguide;
- an input coupler for directing the light into total internal reflection (TIR) paths in a first propagation direction in the waveguide;
- and
- an output grating for extracting the light from the waveguide,
- wherein the fold grating provides a first beam expansion and diffracts light in the first propagation direction into a second propagation direction,
- wherein the output grating provides a second beam expansion,
- wherein light in a first TIR angular range in the first propagation direction undergoes at least two diffractions within the fold grating,
- wherein each ray from the first angular range and its corresponding diffracted rays lie on a diffraction cone of the fold grating,
- wherein each diffraction provides a unique TIR angular range along the second propagation direction,
- wherein the fold grating is slanted with respect to a plane of the waveguide.
9 more elements
Dependencies are inferred from the claim text.