Dimming method and device for fluorescent lamps used for backlig

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

1990-06-21

1992-04-14

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315307, 315DIG4, G05F 100

Patent

active

051051273

ABSTRACT:
A dimming device, with a brightness dimming ratio of 1 to 1000, for a fluorescent lamp used for the backlighting of a liquid crystal screen 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 alternating voltage generator provides power to the lamp only during the pulses. The decrease in tube efficiency for very short pulses allows the required dimming intensity to be achieved without image flickering.

REFERENCES:
patent: 4219760 (1980-08-01), Ferro
patent: 4682083 (1987-07-01), Alley
patent: 4891828 (1990-01-01), Kawazoe
patent: 5001386 (1991-03-01), Sullivan et al.

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