Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2007-07-03
2011-10-11
Ullah, Akm (Department: 2874)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C362S019000
Reexamination Certificate
active
08035776
ABSTRACT:
A liquid crystal cell (5) comprises a layer (4) of cholesteric liquid crystal material; and a retarder (3) disposed in an optical path through the layer (4) of cholesteric liquid crystal material. The cholesteric liquid crystal material is switchable between a first state in which it cooperates with the retarder (3) to provide a first viewing angle range and a second state in which it cooperates with the retarder (3) to provide a second viewing angle range which is smaller than the first viewing angle range. The pitch of the cholesteric liquid crystal material is greater than an intended wavelength of operation of the liquid crystal cell divided by the average refractive index of the liquid crystal material. The liquid crystal cell may be used as a Viewing Angle Restriction (VAR) element, to enable another component, such as a display panel (6), to be operated in either a wide viewing mode or a narrow viewing mode.
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Ball James M.
Gass Paul A.
Sagardoyburu Michel
Smith Nathan J.
Tillin Martin D.
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Sharp Kabushiki Kaisha
Ullah Akm
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