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Electrooptical investigations on a nematic two frequency addressing mixture
Author(s) -
Stettin H.,
Kresse H.,
Demus D.
Publication year - 1989
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170240122
Subject(s) - liquid crystal , superposition principle , twist , sign (mathematics) , dielectric , materials science , mode (computer interface) , anisotropy , transmission (telecommunications) , optics , optoelectronics , physics , telecommunications , computer science , geometry , mathematics , quantum mechanics , mathematical analysis , operating system
The change of the sign of the dielectric anisotropy of a nematic liquid crystal allows an active switching process in electrooptical cells in on and off direction. In the two frequency addressing mode the TN cell shows a qualitative and quantitative different dynamic behaviour in comparison to the conventional driving mode. During the switching on process hydrodynamical domains occur. After switching off the director configuration skips into the −3π/2 twist and thereby it realizes a loss in transmission. The director configuration relaxes into the quarter twist after some minutes. A superposition of low frequent and high frequent voltage gives a strong increase of the number of multiplexable lines.