Projection type video display

Details Projection type video display Projection type video display

2008-04-08

2008-04-08

Dowling, William C. (Department: 2851)

Optics: image projectors

Lamp control

C353S088000

Reexamination Certificate

active

11229492

ABSTRACT:
A shutter device can switch between a state where illuminating light from a lamp of an illuminating device is cut off (referred to as a closing state of the shutter device) and a state where illuminating light passes through (referred to as an opening state of the shutter device). A system control circuit instructs a lamp power source to decrease power supplied to the lamp, when receiving information indicating that the shutter device is in the closing state from the detecting portion. After receiving this instruction, the lamp power source decreases the power supplied to the lamp.

REFERENCES:
patent: 6854851 (2005-02-01), Yamasaki et al.
patent: 7036939 (2006-05-01), Cole et al.
patent: 7070284 (2006-07-01), Tanaka et al.
patent: 2002/0105621 (2002-08-01), Kurematsu
patent: 2004/0196442 (2004-10-01), D'Alessio et al.
patent: 2005/0068505 (2005-03-01), Momose et al.
patent: 2007/0064203 (2007-03-01), Sawai
patent: 2002-365607 (2002-12-01), None

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