Dimming method and device for fluorescent lamps used for...

Details Dimming method and device for fluorescent lamps used for... Dimming method and device for fluorescent lamps used for...

H - Electricity

05

B

315/29

H05B 41/38 (2006.01) G09G 3/34 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2019628

11 ABSTRACT OF THE DISCLOSURE Dimming method and device for fluorescent lamps used for the backlighting of a liquid crystal screen. A dimming device, with a brightness dimming ratio of 1 to 1000 for a fluorescent lamp used for the backlighting of a liq- uid crystal screen. It comprises a periodic signal generator for delivering rectangular pulses with an adjustable duty cycle; the pulses are synchronized with the image synchronizing signal of the liquid crystal screen. An alternative voltage generator provides power to the lamp only during the pulses. he decrease in tube efficiency for very short pulses allows the required dimming intensity to be achieved without image flickering.

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