Oligosiloxane modified liquid crystal formulations and devices using same
US8368831B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 19, 2007 |
| Grant date | Feb 5, 2013 |
| Priority date | — |
| Expiry date | Jun 23, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/023
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane-modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or organic non-liquid crystalline materials, wherein the liquid crystal formulation is nano-phase segregated in the SmC* phase, has an I→SmC* phase transition, with a SmC* temperature range from about 15° C. to about 35° C., has a tilt angle of about 22.5°±6° or about 45°±6°, and has a spontaneous polarization of less than about 50 nC/cm2, and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 μs when switched between two stable states, and an electric drive field of less than about 30 V/μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.