Method for driving liquid crystal light modulating device,...

Details Method for driving liquid crystal light modulating device,... Method for driving liquid crystal light modulating device,...

2007-02-20

2010-12-28

Caley, Michael H (Department: 2871)

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Within nematic phase

C349S165000

Reexamination Certificate

active

07859638

ABSTRACT:
The present invention provides a driving method using a liquid crystal light modulating device including transparent electrodes which each have a horizontally alignment film; and a liquid crystal composition which contains at least a chiral dopant, a dichroic dye and a host liquid crystal. The transparent electrodes face each other to have a cell gap having a width of 10 μm or less therebetween. The liquid crystal composition is filled into the cell gap, and has a positive dielectric constant anisotropy. The driving method attains display-switching by (a) applying a higher voltage than a threshold voltage of the liquid crystal composition into the device so as to be transparent and colorless, (b) applying a lower voltage than a threshold voltage so as to be light-scattered white, or (c) applying no voltage so as to be colored.

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patent: 6108069 (2000-08-01), Okada et al.
patent: 6924873 (2005-08-01), Asada
patent: 2004/0246431 (2004-12-01), Asada
patent: WO-02/093241 (2002-11-01), None

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