Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2006-06-27
2006-06-27
Vu, David (Department: 2828)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S307000, C315SDIG002
Reexamination Certificate
active
07067990
ABSTRACT:
A projection type video display reduces the flicker in projection images caused by the brightness fluctuation of a light source lamp regardless of the kind of lamp used as a light source lamp. The projection type video display includes a driving control circuit for a light source lamp to control a discharge voltage of the light source lamp to prevent flicker caused by brightness fluctuation.
REFERENCES:
patent: 5483127 (1996-01-01), Widmayer et al.
patent: 2003/0098659 (2003-05-01), Okamoto et al.
Nagai Hisashi
Nakamura Hiroshi
Sanyo Electric Co,. Ltd.
Vu David
Westerman, Hattori, Daniels & Adrian , LLP.
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