Liquid crystal display system with lamp feedback

Details Liquid crystal display system with lamp feedback Liquid crystal display system with lamp feedback

2004-06-16

2008-07-01

Patel, Rajnikant B. (Department: 2838)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S307000, C363S098000, C363S025000

Reexamination Certificate

active

07394209

ABSTRACT:
A liquid crystal display system and CCFL power converter circuit is provided using a high-efficiency zero-voltage-switching technique that eliminates switching losses associated with the power MOSFETs. An optimal sweeping-frequency technique is used in the CCFL ignition by accounting for the parasitic capacitance in the resonant tank circuit. Additionally, the circuit is self-learning and is adapted to determine the optimum operating frequency for the circuit with a given load. An over-voltage protection circuit can also be provided to ensure that the circuit components are protected in the case of open-lamp condition.

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