Optics: image projectors – Lamp control
Reexamination Certificate
2011-06-07
2011-06-07
Dowling, William C. (Department: 2878)
Optics: image projectors
Lamp control
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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Deppe Carsten
Hooijer Christofher Daniel Charles
Moench Holger
Munters Tom
Dowling William C.
Howard Ryan
Koninklijke Philips Electronics , N.V.
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