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US 11,988,854 B2Granted
Wide field-of-view holographic skew mirrors
AssigneeAkonia Holographics LLC
InventorsMark R. Ayres, Adam Urness, Kenneth E. Anderson, Friso Schlottau
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Abstract
A holographic skew mirror has a reflective axis, or skew axis, that can be tilted with respect to its surface normal. Tilting the skew axis in two dimensions with respect to the surface normal expands the holographic skew mirror's possible field of view, e.g., to 60 or more. These additional angles can be accessed using an out-of-plane writing geometry with matched total internal grazing extension rotation (TIGER) prisms.
Claims38
An electronic device comprising:
- a layer of medium;
- and
- diffractive gratings in the layer of medium, wherein:
- the diffractive gratings are configured to reflect incident light as reflected light, the incident light and the reflected light form an angle bisected by a reflective axis;
- the reflective axis varies by less than 1 degree where the incident light is incident upon the layer of medium at a range of internal angles of incidence spanning at least 15 degrees;
- and
- the reflective axis is offset from a surface normal of the layer of medium.
4 more elements
A method comprising:
- illuminating diffractive gratings in a medium with incident light, the incident light reflecting off the diffractive gratings as reflected light,
- wherein the incident light and the reflected light form an angle bisected by a reflective axis tilted with respect to a surface normal of the medium, and
- the reflective axis varies by less than 1 degree where the incident light is incident upon the diffractive gratings at a range of internal angles of incidence spanning at least 15 degrees.
A display comprising:
- a medium;
- and
- gratings in the medium and configured to reflect incident light as reflected light, wherein:
- the incident light and the reflected light are separated by an angle that is bisected by a reflective axis, and
- the reflective axis varies by less than 1 degree where the incident light is incident upon the medium at a range of internal angles of incidence spanning at least 15 degrees.
2 more elements
An electronic device comprising:
- a medium;
- and
- at least nine holograms overlapping within a given volume of the medium, the at least nine holograms being configured to reflect incident light about one or more reflective axes offset from a surface normal of the medium, wherein the at least nine holograms have grating frequencies (|KG|) spanning a range of at least 5.0 x 103 radians per meter.
Dependencies are inferred from the claim text.