Patent ID: 7498752

Claim:
A driving method of external electrode fluorescent lamp inverter for backlight comprising: applying a square-wave-voltage to drive an external electrode fluorescent lamp to a primary side of a transformer; and controlling a plurality of switching elements to turn on and off to correspond to the square-wave-voltage, such that a resulting current of the primary side of the transformer to control light emitted from the external electrode fluorescent lamp is formed based on a timing of the plurality of switching elements and the square-wave-voltage, wherein: a frequency of the square-wave-voltage is in a frequency region S where a frequency of the frequency region S is substantially ½ of a resonant frequency, which is determined by a capacitance of the external electrode fluorescent lamp and a leakage inductance of the transformer, and thus causing the external electrode fluorescent lamp to emit the light by a self-discharge, and an operation frequency F is a ratio value obtained by dividing the square-wave-voltage frequency by the resonant frequency, such that the frequency region S is formed in a frequency range of 0.4≦F(S)≦0.6.