US Patent Application No: 2009/0206,763

Number of patents in Portfolio can not be more than 2000

METHOD AND APPARATUS FOR CONTROLLING A DISCHARGE LAMP IN A BACKLIGHTED DISPLAY

ALSO PUBLISHED AS: 7911150

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Abstract

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The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL). The output is a fairly pure sine wave which is proportional to an input control voltage. The output waveform purity is ensured by driving a symmetrical rectangular waveform into a second-order, low pass filter at the resonant frequency of the filter for all conditions of line voltage and delivered power. Operating stress on the step-up transformer is minimized by placing the load (lamp) directly across the secondary side of the transformer. When configured to regulate delivered power, the secondary side may be fully floated which practically eliminates a thermometer effect on the operation of the lamp. All of the active elements, including the power switches, may be integrated into a monolithic silicon circuit.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hsing, Michael Ren Saratoga, CA 8 307
Moyer, James Copland San Jose, CA 23 328
Shannon, John Robert Daly City, CA 7 286

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Patent Info (Count) # Cites Year
 
SEIKO EPSON CORPORATION (1)
8,864,318 Projector with alternating power levels 0 2012
* Cited By Examiner