Controllable liquid crystal layered Fresnel lens device
US11156895B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Nov 19, 2018 |
| Grant date | Oct 26, 2021 |
| Priority date | — |
| Expiry date | Nov 19, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/128
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal optical device providing refractive Fresnel lens type element control over light passing through an aperture is provided. The device includes a layer of liquid crystal material contained by flat substrates having flat alignment layers; and an arrangement of electrodes configured to provide a spatially varying voltage distribution within a number of lensing zones within said liquid crystal layer. The arrangement of electrodes includes ring-shaped electrodes defining boundaries between Fresnel lensing zones. The liquid crystal optical device is structured to provide a spatial variation in the optical phase delay with an abrupt transition at a boundary between lensing zones to increase the effective aperture of the optical device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.