Backlight control circuit with feedback circuit

Details Backlight control circuit with feedback circuit Backlight control circuit with feedback circuit

2007-07-02

2010-06-15

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C305S203000, C305S136000

Reexamination Certificate

active

07737644

ABSTRACT:
An exemplary backlight control circuit (20) includes at least two sampling circuits (21), at least two feedback circuits (22), and a PWM IC (23). Each of the sampling circuits includes a sampling output (210) and a backlight lamp (211). The PWM IC includes a current sense pin (230). The at least two feedback circuits correspond to the at least two sampling circuits, respectively. Each of the feedback circuits includes a resistor (222) and a diode (223) electrically coupled in parallel. The sampling output is configured to output a first voltage when the backlight lamp is in a normal working state, and output a second voltage when the backlight lamp has an open circuit. One terminal of the diode is electrically coupled to the sampling output of a corresponding one of the sampling circuits, and an opposite terminal of the diode is electrically coupled to the current sense pin.

REFERENCES:
patent: 6008591 (1999-12-01), Huber et al.
patent: 6420839 (2002-07-01), Chiang et al.
patent: 6657838 (2003-12-01), Min
patent: 6703796 (2004-03-01), Che-Chen et al.
patent: M258540 (2005-03-01), None

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