Backlight light source drive device

Details Backlight light source drive device Backlight light source drive device

2006-09-27

2008-11-04

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S291000, C315S246000, C315S307000, C315S224000

Reexamination Certificate

active

07446483

ABSTRACT:
This backlight light source drive device includes a plurality of backlight light source drive circuits which drive a plurality of respective backlight light sources, and a control circuit which turns those drive circuits ON and OFF. Each of the drive circuits includes a protection signal output circuit which, when its corresponding tube electrical current decreases, outputs to the control unit a protection signal for stopping the operation of all of the drive circuits. This protection signal output circuit includes an LED illumination circuit which, when the tube electrical current thus decreases, illuminates an LED to indicate the anomalous state, and an LED power supply circuit which always supplies power to the LED illumination circuit. And the control circuit stops the operation of all of the plurality of backlight light source drive circuits, when it receives a protection signal from any one or more of the protection signal output circuits.

REFERENCES:
patent: 6492780 (2002-12-01), Sheu et al.
patent: 2005/0017647 (2005-01-01), Huang
patent: 2006/0220595 (2006-10-01), Lu
patent: 05-142539 (1993-06-01), None
patent: 11-355960 (1999-12-01), None
patent: 2002-134293 (2002-05-01), None

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