Warm-up circuit for CCFLs

Details Warm-up circuit for CCFLs Warm-up circuit for CCFLs

2004-06-22

2008-12-30

Safaipour, Houshang (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S474000, C358S496000, C358S497000

Reexamination Certificate

active

07471427

ABSTRACT:
A warm-up circuit adjusts the brightness of a CCFL through using PWM technique for a scanner. The warm-up circuit has an inverter connected to the CCFL for supplying power, and a PWM controller connected to the inverter for outputting a first control signal to the inverter in a warm-up time and outputting a second control signal to the inverter to control the inverter supplying power to the CCFL in a scan time.

REFERENCES:
patent: 5907742 (1999-05-01), Johnson et al.
patent: 6198234 (2001-03-01), Henry
patent: 6906473 (2005-06-01), Alexandrov
patent: 7183727 (2007-02-01), Ferguson et al.

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