Measuring method and device for liquid crystal viscosity coefficient
US7389677B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 5, 2004 |
| Grant date | Jun 24, 2008 |
| Priority date | — |
| Expiry date | Oct 5, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2011/0073
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a measuring method for determining values of viscosity coefficients of a liquid crystal by fitting Ericksen-Leslie theoretical values to measured response characteristics, in the first step, ON response characteristics of a liquid crystal cell 10 with homogeneous alignment are initially measured, and a value of a rotational viscosity coefficient γ1 is determined from the measured ON response characteristics. Then, in the second step, OFF response characteristics are measured, and values of Miesovicz shear viscosity coefficients η1 and η2 are determined from the measured OFF response characteristics. In the calculation in the first step, the viscosity coefficients other than γ1 are assigned general values. In the calculation in the second step, γ1 is assigned the value determined in the first step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.