| 摘要 |
A backlight inverter in which surface luminance of an LCD is stabilized as compared with that at CCFL actuating by supplying a stabilized lamp current, with no influence by lamp temperature, and its driving method. In a backlight inverter (1) where a plurality of inverter transformers (1) are connected with a plurality of cold cathode lamps (5), primary windings formed on the primary side of the inverter transformers (4) are connected in series, a resonance circuit of leakage inductance and capacitance is formed on the secondary side of each inverter transformer (4), and the inverter transformer (4) is driven at an operating frequency lower than or equal to the intermediate frequency between the series resonance frequency and the parallel resonance frequency in the resonance circuit but higher than or equal to a frequency showing the peak of phase characteristics curve viewed from the primary side of the inverter transformer. |
