Diffraction grating with a variable refractive index using multiple resins
AssigneeFacebook Technologigegs, LLC
InventorsGiuseppe Calafiore, Austin Lane, Matthew E. Colburn
Life of this patent
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Abstract
An inkjet is used to fabricate an optical device having a varying refractive index. The inkjet deposits a first material having a first refractive index and a second material having a second refractive index in a pattern on a substrate. The first material and/or the second material are processed to form an optical device having a refractive index that varies in one or two dimensions. The optical device is used in a virtual-reality system or augmented-reality system to provide angular selectivity from display to a user's eye.
Claims20
A method of creating an optical device having a variable index of refraction, the method comprising:
- receiving a first material having a first refractive index;
- receiving a second material having a second refractive index, wherein the first refractive index is less than the second refractive index;
- depositing the first material and the second material in a pattern on a structure, wherein the structure has a varying refractive index that varies laterally to provide angular selectivity;
- and
- processing the first material and/or the second material to create a layer on the structure having a variable refractive index based on the pattern.
An optical device used in a virtual reality and/or an augmented-reality system, the optical device comprising:
- a substrate;
- a grating on the substrate;
- and
- an overcoat on the grating, wherein:
- the grating is made of a material with a varying refractive index, wherein refractive index varies laterally to provide angular selectivity;
- and
- the overcoat is made of a material with a varying refractive index.
A system used in a virtual reality and/or an augmented-reality system, the system comprising:
- an optical source;
- a waveguide;
- an optical coupler configured to couple light from the optical source into the waveguide;
- and
- an output coupler configured to couple light out of the waveguide, the output coupler comprising:
- a grating having a varying refractive index, wherein the refractive index varies laterally to provide angular selectivity, and
- an overcoat of the grating made of a material with a varying refractive index.
Dependencies are inferred from the claim text.