Pupil equalization
AssigneeAkonia Holographics LLC
InventorsMark Ayres, Adam Urness, Kenneth Anderson, Friso Schlottau
Life of this patent
Estimating the term…
Abstract
An optical reflective device for pupil equalization including at least one or more grating structures within a grating medium is disclosed. The grating structures may have reflective axes that need not be constrained to surface normal. The grating structures are configured to reflect light about substantially constant reflective axes across a relatively wide range of wavelengths. The optical reflective device may reflect light towards a specific location, such as an exit pupil or eye box. Each grating structure within the device may be configured to reflect light of a particular wavelength at a plurality of incidence angles.
Claims36
A device for reflecting light, comprising:
- a grating medium;
- a first grating structure within the grating medium, the first grating structure being configured to reflect light of a wavelength about a first reflective axis offset from a surface normal of the grating medium at a first incidence angle;
- and
- a second grating structure within the grating medium at least partially non-overlapping with the first grating structure, the second grating structure being configured to reflect light of the wavelength about a second reflective axis offset from the surface normal of the grating medium at a second incidence angle different from the first incidence angle.
A head mounted display device, comprising:
- a light source for providing image-bearing light;
- and
- an optical lens comprising,
- a light input section of the optical lens for receiving the image-bearing light, and
- a waveguide disposed within the optical lens operatively coupled to the light input section, the waveguide comprising,
- at least two substrates,
- a grating medium disposed between the at least two substrates,
- a first grating structure within the grating medium, the first grating structure being configured to reflect light of a wavelength about a first reflective axis offset from a surface normal of the grating medium at a first incidence angle, and
- a second grating structure within the grating medium at least partially non-overlapping with the first grating structure, the second grating structure being configured to reflect light of the wavelength about a second reflective axis offset from the surface normal of the grating medium at a second incidence angle different from the first incidence angle.
A method of manufacturing an apparatus for reflecting light, comprising:
- forming a grating medium configured to reflect light;
- forming a first grating structure within the grating medium, the first grating structure being configured to reflect light of a wavelength about a first reflective axis offset from a surface normal of the grating medium at a first incidence angle;
- and
- forming a second grating structure within the grating medium at least partially non-overlapping with the first grating structure, the second grating structure being configured to reflect light of the wavelength about a second reflective axis offset from the surface normal of the grating medium at a second incidence angle different from the first incidence angle.
A method for reflecting light, comprising:
- reflecting, by a first grating structure within a grating medium, at least a first portion of light of a wavelength incident upon the grating medium at a first incidence angle about a first reflective axis offset from a surface normal of the grating medium;
- and
- reflecting, by a second grating structure within the grating medium, at least a second portion of the light of the wavelength incident upon the grating medium at a second incidence angle about a second reflective axis offset from the surface normal of the grating medium, the second incidence angle different from the first incidence angle.
Dependencies are inferred from the claim text.