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US 11,561,437 B2Granted
Broadband and wide viewing angle waveplate having pi-cell
AssigneeMeta Platforms Technologies, LLC
InventorsAfsoon Jamali, Yingfei Jiang
Life of this patent
Estimating the term…
Abstract
An optical element is provided. The optical element includes a positive-C film including a liquid crystal (“LC”) layer. The optical element also includes a positive-A film. The optical element also includes a negative biaxial retardation film disposed between the positive-A film and the positive-C film.
Claims20
An optical element, comprising:
- a positive-C film including a liquid crystal (“LC”) layer;
- a positive-A film;
- and
- a negative biaxial retardation film disposed between the positive-A film and the positive-C film,
- wherein a fast axis of the positive-C film is orientated at about 35° to about 50° relative to a predetermined direction, a slow axis of the negative biaxial retardation film is orientated at about −35° to about −50° relative to the predetermined direction, and a slow axis of the positive-A film is orientated at about 35° to about 50° relative to the predetermined direction.
2 more elements
An optical element, comprising:
- a positive-C film including a liquid crystal (“LC”) layer;
- a positive-A film;
- and
- a negative biaxial retardation film disposed between the positive-A film and the positive-C film,
- wherein tilt angles of LC molecules in the LC layer vary along a thickness direction of the LC layer, and
- wherein along the thickness direction of the LC layer, absolute values of the tilt angles of the LC molecules in the LC layer gradually increase from each of two edges of the LC layer to a center portion of the LC layer.
3 more elements
An optical element, comprising:
- a positive-C film including a liquid crystal (“LC”) layer;
- a positive-A film;
- and
- a negative biaxial retardation film disposed between the positive-A film and the positive-C film,
- wherein the positive-C film includes an LC material with a negative dielectric anisotropy.
2 more elements
Dependencies are inferred from the claim text.