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

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ATTORNEY / AGENT: (SPONSORED)

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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 , US 7 317
Moyer, James Copland San Jose , US 17 340
Shannon, John Robert Daly City , US 6 291

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
* 6,469,454 Cold cathode fluorescent lamp controller 18 2000
 
POWER INTEGRATIONS, INC. (1)
* 6,313,976 Method and apparatus providing a multi-function terminal for a power supply controller 30 2000
 
FAIRCHILD SEMICONDUCTOR CORPORATION (2)
* 5,965,989 Transformer primary side lamp current sense circuit 15 1996
* 5,818,669 Zener diode power dissipation limiting circuit 22 1996
 
O.sub.2 Micro, Inc. (1)
* 5,619,402 Higher-efficiency cold-cathode fluorescent lamp power supply 140 1996
 
PHILIPS ELECTRONICS NORTH AMERICA CORPORATION (2)
* 5,742,134 Inverter driving scheme 21 1996
* 6,008,590 Integrated circuit inverter control having a multi-function pin 28 1996
 
LINEAR TECHNOLOGY CORPORATION (1)
* 6,198,236 Methods and apparatus for controlling the intensity of a fluorescent lamp 61 1999
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
SEIKO EPSON CORPORATION (2)
8,864,318 Projector with alternating power levels 0 2012
* 2013/0088,693 PROJECTOR 2 2012
* Cited By Examiner