Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Reexamination Certificate
2006-10-17
2006-10-17
Ton, Toan (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
C353S031000, C353S034000
Reexamination Certificate
active
07123313
ABSTRACT:
To provide a highly reliable projection display device capable of being used for a long period of time without deterioration of a particular liquid crystal light valve, desirably, without any variation in color balance with time, even if a light source having a deviation of light intensity distribution is used. A projection display device in which a liquid crystal light valve includes a liquid crystal layer including TN liquid crystals having a twisted angle of substantially 90 degrees, with a polarization direction of a primary light LBincident upon the liquid crystal layer and an alignment direction of liquid crystal molecules disposed at a primary-light incident surface of the liquid crystal layer being substantially perpendicular to each other.
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Oliff & Berridg,e PLC
Seiko Epson Corporation
Ton Toan
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