Projector

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United States of America Patent

PATENT NO 9772547
APP PUB NO 20160231643A1
SERIAL NO

14964516

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A projector can prevent a flicker from being caused by rotation of a rotating phosphor plate. The projector includes a solid-state light source that emits excitation light, a rotating phosphor plate that converts the excitation light into phosphor light, a liquid-crystal light modulating device that modulates the light from the rotating phosphor plate, a projection optical system that projects the modulated light onto a screen, and a control device that controls the solid-state light source and the rotating phosphor plate so as to satisfy any one of a conditional expression A=B, a conditional expression A=2B, and a conditional expression |A−B| is greater than or equal to 20 and |A−2B| is greater than or equal to 20, where A represents a pulse width modulation control frequency in hertz of the solid-state light source and B represents a rotation frequency in hertz of the rotating phosphor plate.

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Patent Owner(s)

  • SEIKO EPSON CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Toyooka, Takashi Matsumoto, JP 98 1097
Zakoji, Makoto Matsumoto, JP 27 464

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