Method of representing a video image by means of a projector

Details Method of representing a video image by means of a projector Method of representing a video image by means of a projector

2008-01-08

2008-01-08

Dowling, William C. (Department: 2851)

Optics: image projectors

Lamp control

C315S291000

Reexamination Certificate

active

07316483

ABSTRACT:
The invention relates to a method of representing a video image based on a video signal by means of a projector which comprises an image display device and a high-pressure gas discharge lamp, which lamp is supplied with a square-wave alternating current (I0, I10) on which a current pulse (P1, P3, P10, P40) is superimposed before each phase reversal. According to the invention, the alternating current (I0, I10) is superimposed with a second current pulse (P2, P4, P20, P30, P50, P60) of the same polarity. A simple attunement of the alternating current frequency to the image frequency without image artifacts is made possible by the second pulses (P2, P4, P20, P30, P50, P60).

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