Method for driving a high-pressure gas discharge lamp of a...

Optics: image projectors – Lamp control

Reexamination Certificate

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C353S084000, C345S053000

Reexamination Certificate

active

07954961

ABSTRACT:
A method for driving a high-pressure gas discharge lamp of a projector system, which is suitable to produce and to supply to a light valve device during a projection interval (4) a light beam of a basic color which is selected from several basic colors (G, R, B). The lamp is driven by a lamp current. During said projection interval light valves of the light valve device are controlled in a pulse width modulation manner to have each valve provide a respective wanted light integral over said projection interval. During at least one of a number of successive projection intervals associated with one basic color a magnitude of the lamp current is temporarily reduced for at least a time that all light valves can be controlled for said one basic color.

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patent: 2005120138 (2005-12-01), None

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