Reflective diffractive gratings with variable reflectivity and display systems having the same
First Claim
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1. An optical device comprising:
- an optical waveguide structure comprising;
an incoupling optical element configured to redirect incident light at angles such that the incident light propagates through the optical waveguide structure by total internal reflection, wherein the incoupling optical element comprises;
a diffractive optical grating structure comprising;
a plurality of protrusions; and
a reflective layer on surfaces of the protrusions, andwherein at least one parameter of the reflective layer varies across an area occupied by the plurality of protrusions, andwherein a reflectivity of the diffractive optical grating structure varies with the at least one parameter of the reflective layer across the area occupied by the plurality of protrusions.
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Abstract
In some embodiments, compositions and methods comprising reflective flowable materials, e.g., reflective liquids including reflective inks and/or liquid metals, are described. In some embodiments, a surface is contacted with a reflective flowable material, thereby forming a reflective layer on the surface. In some embodiments, the surface is a surface of a waveguide, for example a waveguide for a display device, and the flowable material coats surfaces of protrusions on the surface to form reflective diffractive optical elements. Some embodiments include a display device comprising a reflective layer of reflective flowable material.
53 Citations
21 Claims
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1. An optical device comprising:
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an optical waveguide structure comprising; an incoupling optical element configured to redirect incident light at angles such that the incident light propagates through the optical waveguide structure by total internal reflection, wherein the incoupling optical element comprises; a diffractive optical grating structure comprising; a plurality of protrusions; and a reflective layer on surfaces of the protrusions, and wherein at least one parameter of the reflective layer varies across an area occupied by the plurality of protrusions, and wherein a reflectivity of the diffractive optical grating structure varies with the at least one parameter of the reflective layer across the area occupied by the plurality of protrusions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification