Projector having an illuminance detector

Details Projector having an illuminance detector Projector having an illuminance detector

2006-10-03

2006-10-03

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S100000, C353S102000, C349S005000, C349S007000

Reexamination Certificate

active

07114814

ABSTRACT:
The invention provides a projector having a light source, a display device to modulate light emitted from the light source, a lens device to project light emitted from the light source via the display device, wherein the lens device has a diaphragm mechanism formed having an aperture, an ambient light illuminance detector to measure illuminance of ambient light, a projected image illuminance detector to measure illuminance of an image projected on the screen, an illuminance comparator to compare an illuminance detected by the ambient light illuminance detector and an illuminance detected by the projected image illuminance detector, and a diaphragm mechanism/image signal controller to control an intensity of image signals input into the display device and to control a size of an opening of the aperture of the diaphragm mechanism in accordance with a result of comparison by the illuminance comparator.

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