Liquid crystal device with a bistable chiral smectic liquid crystal having a phase transition series lacking a cholesteric phase #16
US5825447A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Jun 19, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A chiral smectic liquid crystal device with good planar homogeneity in a layer normal direction can be constituted by disposing a chiral smectic liquid crystal having no cholesteric phase between a pair of substrates having mutually different characters, particularly in terms of Iso-SmA phase transition temperature. The liquid crystal may preferably have a layer spacing-changing characteristic such that it provides a layer spacing d.sub.A at a first transition point where the layer spacing of the liquid crystal begins to decrease on temperature decrease in the vicinity of a transition temperature from SmA phase to SmC* phase and a layer spacing d.sub.min at a second transition point where the layer spacing of the liquid crystal begins to increase on further temperature decrease from the first transition point, satisfying 0.96.ltoreq.d.sub.min /d.sub.A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.