Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Reexamination Certificate
2006-12-12
2006-12-12
Font, Frank G. (Department: 2883)
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
Reexamination Certificate
active
07148936
ABSTRACT:
The present invention provides a projection type liquid crystal display device capable of achieving a high contrast ratio without causing optical leakage on boundary wavelength regions of three color light components in the case of a black display. The projection type liquid crystal display device is provided with a first and a second retarder stacks each of which has cut-off wavelengths. The cut-off wavelength on the short wavelength side of the first retarder stack is placed on a shorter wavelength side as compared with the cut-off wavelength on the short wavelength side of the second retarder stack, and the cut-off wavelength on the long wavelength side of the first retarder stack is placed on a longer wavelength side as compared with the cut-off wavelength on the long wavelength side of the second retarder stack.
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Aoto Katsuhide
Hirota Shoichi
Nakagawa Hideki
Takemoto Iwao
Dickstein & Shapiro LLP
Font Frank G.
Hitachi , Ltd.
Rude Timothy L.
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