Backlight inverter for liquid crystal display panel of...

Details Backlight inverter for liquid crystal display panel of... Backlight inverter for liquid crystal display panel of...

2005-03-08

2005-03-08

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C315S299000, C315S308000, C315S360000

Reexamination Certificate

active

06864643

ABSTRACT:
A backlight inverter for an LCD panel of an asynchronous pulse width modulation (PWM) driving type which is capable of driving a plurality of cold cathode fluorescent lamps (CCFLs) in pairs and controlling a plurality of PWM drive signals for respective operations of the lamps to make the phases thereof different. The backlight inverter comprises a main driving integrated circuit (IC), at least one sub-driving IC, and a plurality of lamp operating circuits for operating the pairs of lamps in response to the first and second PWM drive signals and the third and fourth PWM drive signals, respectively. The lamps have different PWM on/off periods so that overshoot of a power supply circuit can be reduced so as to keep the entire system power stable.

REFERENCES:
patent: 6259615 (2001-07-01), Lin
patent: 6501234 (2002-12-01), Lin et al.
patent: 6707264 (2004-03-01), Lin et al.
patent: 20020057238 (2002-05-01), Nitta et al.

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