Dual frequency addressable liquid crystals and methods of use
US4729639A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1984 |
| Grant date | Mar 8, 1988 |
| Priority date | — |
| Expiry date | Apr 24, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1392
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A twisted nematic liquid crystal material used in a dual-frequency addressable liquid crystal cell is disclosed. Specific materials include an eutectic mixture of 2-5 monoester compounds having the formula R--X--Y--CO.sub.2 --Z--R', wherein R and R' is a straight alkyl having 2-7 carbon atoms and where each of X, Y and Z is a phenyl or trans-cyclohexyl and at least one of X, Y and Z is a trans-cyclohexyl. Also included are up to 25 weight percent of dopants to reduce viscosity and up to 10 weight percent of additives to lower the cross-over frequency, the additives being of the formula: ##STR1## wherein X is selected from the group consisting of: ##STR2## wherein R is a straight alkyl having 2-7 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.