Liquid crystal half-wave plate lens
AssigneeFacebook Technologies, LLC
InventorsJianru Shi, Mary Lou Jepsen
Life of this patent
Estimating the term…
Abstract
A lens includes immobilized liquid crystals. The liquid crystals in a first region are aligned in a first orientation. The liquid crystals in a second region, located between the first region and a third region and adjacent to the first region and the third region, are aligned in a second orientation that is distinct from the first orientation. The liquid crystals in the third region, located between the second region and a fourth region and adjacent to the second region and the fourth region, are aligned in the first orientation. The liquid crystals in the fourth region, located adjacent to the third region, are aligned in the second orientation. A device with the lens and an array of light emitting devices is also disclosed.
Claims10
A diffractive lens, comprising:
- immobilized liquid crystals, wherein:
- the liquid crystals in a first region are aligned in a first orientation;
- the liquid crystals in a second region, located between the first region and a third region and adjacent to the first region and the third region, are aligned in a second orientation that is distinct from the first orientation;
- the liquid crystals in the third region, located between the second region and a fourth region and adjacent to the second region and the fourth region, are aligned in the first orientation;
- and
- the liquid crystals in the fourth region, located adjacent to the third region, are aligned in the second orientation, wherein the first region and the third region are spaced apart to cause diffraction of impinging light.
Dependencies are inferred from the claim text.