Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2011-02-22
2011-02-22
Ullah, Akm E (Department: 2874)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S100000
Reexamination Certificate
active
07894018
ABSTRACT:
The invention relates to a method of producing a liquid crystal material that can be addressed by an electric field. The inventive method is characterised in that it comprises the following steps consisting in: forming a liquid crystal mixture having a helical structure comprising a first non-photoreactive liquid crystal and a second photoreactive liquid crystal, said first liquid crystal comprising first chiral liquid crystal molecules and having a positive dielectric anisotropy and said second liquid crystal being in a concentration of less than or equal to 5% of the mixture; applying a first treatment to the liquid crystal mixture, said first treatment being performed at a constant temperature and modifying a pitch of the helix of the mixture; and applying a second treatment to the mixture, such that the second liquid crystal 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 pitch of the helix. The invention also relates to a liquid crystal device comprising a liquid crystal material that is produced using the inventive method.
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Blakely & Sokoloff, Taylor & Zafman
Centre National de la Recherche Scientifique "CNRS"
Ullah Akm E
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