Projection type video display
AssigneeSanyo Electric Co., Ltd.
InventorsHisashi Nakamura, Kei Yasukawa
Life of this patent
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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.
Claims16
A projection type video display that optically modulates light emitted from a light source by a light valve and projects image light, comprising:
- a shutter device that opens and closes mechanically, and cuts off the light in a closing state;
- a shutter information output portion for outputting opening and closing information of the shutter device;
- and
- a light source control means for decreasing a light-emitting amount of the light source in a state where the shutter device is closed.
Dependencies are inferred from the claim text.