Optics: image projectors – Temperature control
Reexamination Certificate
2007-06-12
2007-06-12
Perkey, W. B. (Department: 2851)
Optics: image projectors
Temperature control
C353S020000, C353S060000, C353S084000, C349S009000, C349S072000, C349S199000
Reexamination Certificate
active
11088982
ABSTRACT:
Embodiments of the invention restrain temperature rise in a light exiting-side polarizer included in a liquid crystal light valve without limiting the quantity of light incident on the liquid crystal light valve and a projector that has a liquid crystal light valve to modulate incident light in accordance with a provided image signal and that projects an image represented by modulated light exiting from the liquid crystal light valve. The projector has a black level adjusting unit to adjust black level of the image signal, a temperature-detecting unit to detect temperature of the light exiting-side polarizer, and a control unit to control operation of the black level-adjusting unit. The control unit is characterized by causing the black level-adjusting unit to adjust the black level of the image signal on the basis of the temperature detected by the temperature-detecting unit in order to restrain temperature rise in the light exiting-side polarizer.
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Cruz Magda
Oliff & Berridg,e PLC
Perkey W. B.
Seiko Epson Corporation
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