Wide band variable transmittance optical device and mixture
US9134551B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2011 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | May 28, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133305
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
We describe a wide band variable transmission optical device, mixtures for use in such a device, and methods of making the same. The wide band optical device includes a cell comprising a guest-host mixture of a liquid crystal host and a dichroic guest dye material contained between a pair of plastic substrates. The optical device does not use polarizers. The liquid crystal host has an axis orientation that is alterable between a clear state orientation and a dark state orientation perpendicular thereto and the dichroic guest dye material includes one or more dichroic dyes. The optical device is characterized in that it exhibits a wide absorption band that is greater than 175 nm within a visible wavelength range of 400-700 nm and has a clear state transmission equal to or above 30% and a dark state transmission equal to or below 40%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.