Focus adjusting pancharatnam berry phase liquid crystal lenses in a head-mounted display
US10379419B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2017 |
| Grant date | Aug 13, 2019 |
| Priority date | — |
| Expiry date | Sep 13, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/294
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A varifocal block includes, in optical series, a switchable half waveplate (SHWP) and a plurality of liquid crystal (LC) lenses. The SHWP outputs circularly polarized light, and a handedness of the circularly polarized light is controlled by the SHWP being in an active state or a non-active state. Each LC lens of the plurality of LC lenses has a plurality of optical states, the plurality of optical states including an additive state that adds optical power to the LC lens and a subtractive state that removes optical power from the LC lens. The plurality of optical states of each of the plurality of the LC lenses compounded in optical series provides a range of adjustment of optical power for the varifocal block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.