Patent ID: 7443111

Claim:
A liquid crystal display backlight inverter comprising: a first error amplifying unit receiving and comparing a first detection voltage corresponding to a current flowing through a lamp with a first preset reference voltage and outputting a first error voltage corresponding to an error therebetween; a second error amplifying unit receiving and comparing a second detection voltage corresponding to a voltage applied to the lamp with a second preset reference voltage and outputting a second error voltage corresponding to an error therebetween; a feedback selector grounding an input terminal of the first error amplifying unit, to which the first detection voltage is inputted, and inputting the second detection voltage to the second error amplifying unit when the second detection voltage is greater than a third preset reference voltage and inputting the first detection voltage to the first error amplifying unit and grounding an input terminal of the second error amplifying unit, to which the second detection voltage is inputted, when the second detection voltage is smaller than the third reference voltage; and a lamp control pulse generator generating a pulse signal having a duty controlled according to one of the first error voltage and second error voltage.