Projection-type system and method of operating the same
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United States of America Patent
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Apr 14, 2009
Grant Date -
Apr 5, 2007
app pub date -
Jul 15, 2004
filing date -
Jul 15, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An object of the invention is to provide method of operating a projection-type system, which method is capable of suppressing flicker and minimizing gradation disorder at the same time by superimposing a pulse current on a d.c. lamp current to stabilize arc while synchronizing the superimposition of the pulse current on the d.c. lamp current with a predetermined segment. The method of operating a projection-type system configured to pass light emitted from a high-pressure discharge lamp lit by d.c. lighting through divided plural color segments sequentially to project an image onto a screen, includes superimposing a pulse current on a d.c. lamp current in the high-pressure discharge lamp in synchronism with at least one specific color segment.
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