METHOD AND APPARATUS FOR EQUALIZING CURRENT IN A FLUORESCENT LAMP ARRAY
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United States of America Patent
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app pub date -
Mar 29, 2007
filing date -
Nov 6, 2003
priority date (Note) -
Abandoned
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Abstract
The disclosed embodiments provide a method and apparatus for visual enhancement of liquid crystal displays. A microprocessor or embedded microcontroller associated with visual enhancement circuit modules allows a single inverter to control the intensity of illumination for an array of multiple CCFLs. The microcontroller continuously senses the operating currents of every lamp and adjusts for variations in illumination of individual lamps by parallel switching of capacitance that ensures an equal current is applied to each lamp. The microcontroller produces the appropriate control signals and executes a digital servo control algorithm to modify the currents for carrying out the luminance adjustments.
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