Grey scale liquid crystal material
US5384067A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1992 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | May 18, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13775
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of selectively adjusting the intensity of reflection to obtain stable grey scale reflectance of colored light from a light modulating chiral nematic liquid crystal material is disclosed. The method comprises subjecting the material to an electric field pulse of sufficient duration and voltage to cause a first proportion of the chiral nematic material to exhibit a first optical state and a second proportion of the chiral nematic material to exhibit a second optical state, whereby the material will continuously reflect a selected intensity between a maximum and minimum that is proportional to the amount of the material in the first optical state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.