Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2006-12-19
2006-12-19
Le, Hoanganh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S224000
Reexamination Certificate
active
07151345
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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White Paper for CEYX Technologies LCD Backlighting Control ‘Online, published Mar. 30, 2005, pp. 1-5 XP002322704 Retrieved from the Internet: URL:http://www.ceyx.com/web/WhitepaperLCDBacklightingControl.pdf>’ retrieved on Mar. 30, 2005!.
International Search Authority for PCT/US2004/037504, date of mailing Jul. 18, 2005 and written opinion.
CEYX Technologies, Inc.
Le Hoang-anh
Le Tung
Reidelbach, Jr. Charles F.
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