Patent ID: 7612505

Claim:
A liquid crystal display backlight inverter comprising: a dimming control unit comparing a level of a triangle wave of a first frequency 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 configured to ground when the dimming control current is not inputted; 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; and a lamp control pulse generating unit having an input end connected to the output end of the error amplification unit, comparing a level of a signal inputted via the input end with a level of a triangle wave having a second frequency, and generating a lamp control pulse with a duty controlled according to a comparison result.