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US 11,262,638 B2Granted
Liquid crystal mixtures for pitch variable optical elements
AssigneeFacebook Technologies, LLC
InventorsYingfei Jiang, Afsoon Jamali, Changwon Jang, Adrian Travis, Andrew Maimone, Lu Lu
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Abstract
A liquid crystal (LC) mixture for a pitch variable optical element is provided. The LC mixture includes a host LC and one or more LC dimers dissolved as a guest in the host LC. The host LC and the one or more LC dimers have respective dielectric anisotropies of opposite signs in nematic phase. A net dielectric anisotropy of the LC mixture is substantially neutral.
Claims17
An optical element, comprising:
- a liquid crystal (LC) mixture including a plurality of flexoelectric domains;
- and
- a first electrode and a second electrode configured to provide a driving voltage to the flexoelectric domains in the LC mixture,
- wherein a pitch of a flexoelectric domain is variable as an amplitude of the driving voltage varies, and
- wherein the LC mixture includes:
- a host LC;
- and
- one or more LC dimers dissolved as a guest in the host LC, the host LC and the one or more LC dimers having respective dielectric anisotropies of opposite signs in a nematic phase, and a net dielectric anisotropy of the LC mixture being neutral.
5 more elements
Dependencies are inferred from the claim text.