Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Reexamination Certificate
2005-09-13
2005-09-13
Kim, Robert H. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
C349S098000, C349S119000, C349S130000
Reexamination Certificate
active
06943851
ABSTRACT:
The invention provides a liquid crystal device that can obtain a perfect black level display even if a liquid crystal device using circular polarization is employed as a light valve. The liquid crystal device can include, liquid crystal panels each for rotating light incident from a liquid crystal layer sealed between a pair of substrates facing each other, first polarizers each for converting incident light into a circularly polarized components in one rotary direction to emit to the liquid crystal panel, the first polarizer each facing the incidence surface of the relevant liquid crystal panels and having a birefringence characteristic based on the peak wavelength of the incident light, and second polarizers for transmitting the circularly polarized components in the other rotary direction of the light that passed through the liquid crystal panels, respectively, the second polarizers facing the exit surfaces of the liquid crystal panels and having birefringence characteristics based on the peak wavelengths of the incident lights.
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patent: 2002/0093284 (2002-07-01), Adachi et al.
patent: 2002/0159006 (2002-10-01), Miyatake et al.
patent: 2003/0002151 (2003-01-01), Yano
patent: 2002-040428 (2002-06-01), None
Duong Tai
Kim Robert H.
Seiko Epson Corporation
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