Liquid crystal display backlight inverter

Details Liquid crystal display backlight inverter Liquid crystal display backlight inverter

2007-06-20

2009-11-03

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S247000, C315S360000, C345S087000, C345S102000

Reexamination Certificate

active

07612505

ABSTRACT:
A LCD backlight inverter including: a dimming control unit comparing a level of a triangle wave with a level of a dimming control signal and controlling a dimming control current to be supplied or interrupted according to a comparison result; an error amplification unit having an input end to which a detection voltage corresponding to the dimming control current and a current flowing through a lamp are inputted, comparing the detection voltage with a predetermined reference voltage, and outputting an error voltage corresponding to a difference via an output end thereof, the output end working as a ground when the dimming control current is not inputted; and a time constant circuit unit comprising a resistor connected between the output end of the error amplification unit and a voltage source and a capacitor connected between the output end of the error amplification unit and a ground.

REFERENCES:
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patent: 7394209 (2008-07-01), Lin et al.
patent: 2002/0063534 (2002-03-01), Min
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patent: 2072754 (1991-03-01), None
Chinese Office Action, with English Translation, issued in Chinese Patent Application No. CN 200710111450.8 dated on Jul. 18, 2008.

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