Driving circuit for LCD backlight lamps

Details Driving circuit for LCD backlight lamps Driving circuit for LCD backlight lamps

2007-10-23

2007-10-23

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S299000, C315S224000, C315S210000

Reexamination Certificate

active

11321474

ABSTRACT:
An LCD backlight driving circuit is provided for providing protection to LCD backlight lamps. In a preferred embodiment, the driving circuit for LCD backlight lamps comprises: a PWM controller sending control signals; two transistors receiving the control signals and sending two low-voltage pulse signals; an inverter converting the two low-voltage pulse signals to a high-voltage AC (Alternating Current) power; two lamps; two overvoltage protection circuits connected to the two lamps respectively; a voltage feedback module connected to the two lamps, a current feedback module connected to one of the two lamps; and a double-bridge circuit connected between the two lamps, and connected to the current feedback module for controlling the PWM controller to turn-on or turn-off. The driving circuit is capable of providing defective connection protection and open-circuit protection to LCD backlight lamps, and proportionately adjusting current flowing through the lamps.

REFERENCES:
patent: 5747941 (1998-05-01), Shackle et al.
patent: 6104146 (2000-08-01), Chou et al.
patent: 6326740 (2001-12-01), Chang et al.
patent: 6459216 (2002-10-01), Tsai
patent: 6570344 (2003-05-01), Lin
patent: 6812916 (2004-11-01), Hwang
patent: 6856099 (2005-02-01), Chen et al.

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