Grating structures for color waveguides
AssigneeDigiLens Inc.
InventorsJonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a waveguide-based display comprising: a waveguide, a source of image modulated light projected over a field of view; an input coupler for coupling said light into a total internal reflection (TIR) path within the waveguide; and a grating structure for providing beam expansion of the TIR light in at least one direction and extracting the TIR light from the waveguide. The grating structure may include a plurality of grating elements having at least two different grating prescriptions and at least one surface relief grating formed by a phase separation process.
Claims19
A waveguide-based display device comprising:
- a waveguide;
- a source of image modulated light projected over a field of view;
- an input coupler for coupling said light into a total internal reflection (TIR) path within the waveguide;
- and
- a grating structure for providing beam expansion of the TIR light in at least one direction and extracting the TIR light from the waveguide, wherein the grating structure comprises a plurality of grating elements having at least two different grating prescriptions and at least one surface relief grating formed by a phase separation process;
- wherein the grating structure is configured to enable a plurality of ray path lengths within the grating structure that differ in length by a distance shorter than a coherence length of the source of image modulated light.
Dependencies are inferred from the claim text.