Control device for multiple lamp currents of liquid crystal...

Details Control device for multiple lamp currents of liquid crystal... Control device for multiple lamp currents of liquid crystal...

2007-09-11

2007-09-11

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S312000

Reexamination Certificate

active

11335655

ABSTRACT:
A control device for multiple lamp currents of a liquid crystal display (LCD) backlight source, comprising an electronic power switch, a transformer, an inverter and an integrated circuit (IC) feedback control module. The transformer has a primary side connected to the electronic power switch and a secondary side having two ends each connected to an end of a set of lamp composed of two lamps. The inverter has three sets of coil connected to the other end of the two sets of lamp. The IC feedback control module is connected between the inverter and the electronic power switch and through which currents flown through the two sets of lamp may be balanced. Meanwhile, the current flown through the inverter is feedback to the IC feedback control module by which a control signal is outputted to the electronic power switch by determining and processing the feedback current, thereby controlling an output signal from the electronic power switch. Therefore, luminance of the multiple lamps in the LCD backlight source may be controlled and maintained.

REFERENCES:
patent: 6310444 (2001-10-01), Chang
patent: 6661181 (2003-12-01), Shin
patent: 6979957 (2005-12-01), Lee et al.
patent: 7190128 (2007-03-01), Chen et al.
patent: 2005/0093472 (2005-05-01), Jin

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