Optically active compound and liquid crystal composition...

Details Optically active compound and liquid crystal composition... Optically active compound and liquid crystal composition...

2004-02-19

2004-12-28

Wu, Shean C. (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299200, C252S299500, C560S056000, C560S080000, C560S100000

Reexamination Certificate

active

06835427

ABSTRACT:

DETAILED DESCRIPTION OF THE INVENTION
Field of the Invention
The present invention relates to a novel optically active compound useful as a chiral dopant, a liquid crystal composition containing the compound, and a liquid crystal display device to which the liquid crystal composition is applied. More specifically, it relates to a chiral dopant having a helical twisting power (to be called “HTP” for short) of at least 50 and a use thereof.
Various modes are known as display modes of liquid crystal display devices, and in most of such display modes, it is required to control the helical pitch of a liquid crystal. The mode that requires the control of the helical pitch of a liquid crystal includes the following modes. The modes that have been practically and widely used are a twisted nematic mode (TN mode) and a super twisted nematic mode (STN mode) both using a nematic liquid crystal.
In the TN mode, liquid crystal molecules are aligned so as to twist 90 degrees between an upper substrate and a lower substrate, and a ¼ pitch of a helix is formed in a cell.
In the STN mode, liquid crystal molecules are aligned so as to twist approximately 220 degrees between an upper substrate and a lower substrate, and an approximately ⅗ pitch of a helix is formed in a cell.
The TN mode is employed in a simple matrix driving liquid crystal display device and an active matrix driving liquid crystal display device, and the STN mode is employed in a simple matrix driving liquid crystal display device.


REFERENCES:
patent: 6699532 (2004-03-01), Motoyama et al.
patent: 62-081354 (1987-04-01), None
patent: 2002-179669 (2002-06-01), None
patent: 02/34739 (2002-05-01), None
CAPLUS 1989: 457224.*
H. J. Deuben et al., “New 6,6′-Disubstituted-Binaphthol Derivatives as Chiral Dopants: Synthesis and Temperature Dependence of Molecular Conformations”, Liquid Crystals, 1996, vol. 21, No. 3, pp. 327-340.

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