Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified...
Reexamination Certificate
2011-02-15
2011-02-15
Visconti, Geraldina (Department: 1722)
Stock material or miscellaneous articles
Liquid crystal optical display having layer of specified...
C428S001200, C428S001300, C428S001400, C252S299010, C252S299600, C430S020000, C349S001000, C349S056000
Reexamination Certificate
active
07887892
ABSTRACT:
The invention relates to a method of producing a liquid crystal material. The inventive method is characterised in that it comprises the following steps consisting in: applying a first treatment to a liquid crystal mixture having a helical structure comprising a first non-photoreactive liquid crystal (A) and a second photoreactive liquid crystal (B), said first treatment modifying a handedness of the helix of the mixture; and applying a second treatment to the mixture such that the second liquid crystal (B) forms a polymer network, said second treatment being performed during all or part of the first treatment such that the liquid crystal material retains a memory of the modifications to the helix and the entire volume of the material has both a right-handed and left-handed helical structure. The invention also relates to a liquid crystal device comprising a liquid crystal material consisting of at least one liquid crystal having a helical structure, which is characterised in that the entire volume of the material has both a right-handed and left-handed helical structure, such that the device has a reflection rate of more than 50%.
REFERENCES:
patent: 5691789 (1997-11-01), Li et al.
patent: 5940150 (1999-08-01), Faris et al.
patent: 5999243 (1999-12-01), Kameyama et al.
patent: 6010643 (2000-01-01), Coates et al.
patent: 6017468 (2000-01-01), Chung et al.
patent: 6057008 (2000-05-01), Schwalb et al.
patent: 6061108 (2000-05-01), Anderson et al.
patent: 6071438 (2000-06-01), Leigeber et al.
patent: 6099758 (2000-08-01), Verrall et al.
patent: 2002/0041346 (2002-04-01), Faris et al.
patent: 2002/0057400 (2002-05-01), Li et al.
patent: 2003/0104144 (2003-06-01), Hammond-Smith et al.
patent: 2004/0011994 (2004-01-01), Yumoto et al.
patent: 2009/0128744 (2009-05-01), Mitov
patent: 0982605 (2000-03-01), None
patent: 1249483 (2002-10-01), None
patent: 1295929 (2003-03-01), None
patent: 2781062 (2000-01-01), None
patent: 2326727 (1998-12-01), None
patent: 2355720 (2001-05-01), None
patent: WO 94-15785 (1994-07-01), None
patent: WO 97-16762 (1997-05-01), None
patent: WO 98-57223 (1998-12-01), None
patent: WO 99-63400 (1999-12-01), None
patent: WO 00-60407 (2000-10-01), None
patent: WO 02/056067 (2002-07-01), None
Michel Mitov, et al.; “Broadening of light reflection in glassy cholesteric materials and switchable Polymer-Stabilized Cholersteric Liquid Crystals,”;Proceedings of SPIE, vol. 4463, 2001, pp. 11-20.
Alexandrine Lavernhe, et al.; “Prelimination communication: How to broaden the light reflection band in cholesteric liquid crystals? A new approach based on polymorphism”;Liquid Crystals, vol. 28, 2001, pp. 803-807.
Michel Mitov, et al.; “Glassy Cholesteric Broadband Reflectors with a Pitch Gradient: Material Design, Optical Properties and Microstructure,”;Mol. Cryst. and Liq. Cryst., vol. 358, 2001, pp. 209-223.
Corrine Binet, et al.; “Switchable broadband light reflection in polymer-stabilized cholesteric liquid crystals,”;Journal of Applied Physics, vol. 90, No. 4, Aug. 15, 2001, pp. 1730-1734.
Dessaud Nathalie
Mitov Michel
Blakely , Sokoloff, Taylor & Zafman LLP
Centre National de la Recherche Scientifique "CNRS"
Visconti Geraldina
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