Title:
MEASRUING METHOD AND DEVICE FOR LIQUID CRYSTAL VISCOSITYCOEFFICIENT
Document Type and Number:
WIPO Patent Application WO/2005/036137
Kind Code:
A1
Abstract:
[PROBLEMS] A method and a device for measuring liquid crystal viscosity coefficient capable of easily measuring with high accuracy response speed-governing rotating viscosity coefficient &gammad 1 and Miesowicz’s shear viscosity coefficients &eegr 1 and &eegr 2. [MEANS FOR SOLVING PROBLEMS] A method of measuring liquid crystal viscosity coefficients for determining the values of viscosity coefficients by the fitting between the Erichsen-Lesly theoretical value and the actually measured value of response characteristics, wherein a homogeneous-orientation liquid crystal cell (10) is selected as an object of measuring, on-response characteristics are measured as a first step to determine the value of rotating viscosity coefficient&gammad 1 from the measured result, and then off-response characteristics are measured as a second step to determine the values of Miesowicz’s shear viscosity coefficients &eegr 1 and &eegr 2 from the measured result. General values are used for viscosity coefficients other than &gammad 1 in the first step calculation, and values determined in the first step are used for &gammad 1 in the second step calculation.
Inventors:
UCHIDA TATSUO (JP)
MIYASHITA TETSUYA (JP)
ISHINABE TAKAHIRO (JP)
MIYASHITA TETSUYA (JP)
ISHINABE TAKAHIRO (JP)
Application Number:
PCT/JP2004/014627
Publication Date:
April 21, 2005
Filing Date:
October 05, 2004
Export Citation:
Assignee:
UCHIDA TATSUO (JP)
TOHOKU TECHNO BRAINS CORP (JP)
AOMORI SUPPORT CT FOR IND PROM (JP)
MIYASHITA TETSUYA (JP)
ISHINABE TAKAHIRO (JP)
TOHOKU TECHNO BRAINS CORP (JP)
AOMORI SUPPORT CT FOR IND PROM (JP)
MIYASHITA TETSUYA (JP)
ISHINABE TAKAHIRO (JP)
International Classes:
C09K19/02; G01N11/00; G01N21/59; G02F1/00; (IPC1-7): G01N11/00
Other References:
GAHWILLER CH.: "Direct determination of the five independent viscosity coefficients of nematic liquid crystals, molecular crystals and liquid crystals", vol. 20, 1973, pages 301 - 318, XP000964524
GRAF H.H.: "Shear and rotational viscosity coefficients of two nematic liquid crystals", MOLECULAR PHYSICS, vol. 77, no. 3, 1992, pages 521 - 538, XP000964546
ARMITAGE S.: "Nematic liquid-crystal viscosity and response time", SID96, DIGEST, 1996, pages 584 - 587, XP000960529
ONDA S.: "Dynamic behavior of OCB-cell with fast respose for a color sequential liquid crystal display", ASIA DISPLAY 98, 1998, pages 1055 - 1058, XP002155364
COSSALTER O.: "A new method of viscosity determination from the electro-optical response of a nematic LCD", J. PHYS., 1996, FRANCE, pages 1663 - 1668, XP009100614
KARP K.: "Measurements of hydrodynamic parameters for nematic 5CB", MOL. CRYST. LIQ. CRYST., vol. 60, 1980, pages 215 - 236, XP009100616
See also references of EP 1672350A4
GRAF H.H.: "Shear and rotational viscosity coefficients of two nematic liquid crystals", MOLECULAR PHYSICS, vol. 77, no. 3, 1992, pages 521 - 538, XP000964546
ARMITAGE S.: "Nematic liquid-crystal viscosity and response time", SID96, DIGEST, 1996, pages 584 - 587, XP000960529
ONDA S.: "Dynamic behavior of OCB-cell with fast respose for a color sequential liquid crystal display", ASIA DISPLAY 98, 1998, pages 1055 - 1058, XP002155364
COSSALTER O.: "A new method of viscosity determination from the electro-optical response of a nematic LCD", J. PHYS., 1996, FRANCE, pages 1663 - 1668, XP009100614
KARP K.: "Measurements of hydrodynamic parameters for nematic 5CB", MOL. CRYST. LIQ. CRYST., vol. 60, 1980, pages 215 - 236, XP009100616
See also references of EP 1672350A4
Attorney, Agent or Firm:
Kobayashi, Eiichi (Funabashi-shi, Chiba 05, JP)
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