Measurement techniques for liquid crystal parameters including rotational viscosity
AssigneeInstec, Inc.
InventorsHenry Zhong ZOU, Lianhua JI
Life of this patent
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Abstract
Provided is a set of techniques for measuring different properties or parameters of liquid crystal mixtures by applying a driving waveform and measuring the response current and/or the optical response. This may be done by using specific liquid crystal test cells. Also provided are the optimized test cell parameters that are used in the algorithms for calculating the properties.
Claims13
1-19. (canceled)
A method for measuring the rotational viscosity of a liquid crystal mixture under test, the method comprising:
- providing a liquid crystal test cell having a pair of electrodes;
- placing the liquid crystal mixture under test into the liquid crystal test cell;
- applying an electrical driving signal to the electrodes of the liquid crystal test cell;
- measuring an electrical response signal from the electrodes;
- and
- based on the electrical driving signal and the electrical response signal, and in the absence of measuring light transmitted through or reflected off of the liquid crystal test cell, determining the rotational viscosity for the liquid crystal mixture under test.
A method for measuring a performance parameter of a liquid crystal mixture under test, the method comprising:
- providing a liquid crystal test cell having a pair of electrodes;
- placing the liquid crystal mixture under test into the liquid crystal test cell;
- applying an electrical driving signal to the electrodes of the liquid crystal test cell;
- measuring an electrical response signal from the electrodes;
- and
- based on the electrical driving signal and the electrical response signal, and in the absence of measuring light transmitted through or reflected off of the liquid crystal test cell, determining the performance parameter for the liquid crystal mixture under test;
- wherein the performance parameter is a rotational viscosity for the liquid crystal mixture under test.
25-27. (canceled)
Dependencies are inferred from the claim text.