Patent ID: 7479739

Claim:
An inverter circuit comprising: a first electrode supplying a first voltage having a polarity to even-numbered cold cathode fluorescent lamps among an even number of cold cathode fluorescent lamps disposed in one direction; a second electrode supplying a second voltage having an opposite polarity to the first voltage to odd-numbered cold cathode fluorescent lamps; and a balance circuit controlling currents flowing through the cold cathode fluorescent lamps, wherein the cold cathode fluorescent lamps are halved into a first group higher in temperature and a second group lower in temperature than the first group, and the balance circuit comprises: a plurality of primary coils directly connected to the lamps, at least one primary coil of the plurality of primary coils is directly connected between a cold cathode fluorescent lamp at a highest position of the first group and a cold cathode fluorescent lamp at a lowest position of the second group; and a plurality of secondary coils corresponding to the primary coils and connected to each other to form a loop.