Patent ID: 7436130

Claim:
A cold-cathode tube lighting device comprising: a plurality of ballasts, at least one of said ballasts being connected to an electrode at one end of each of a plurality of cold-cathode tubes; a first low-impedance power source having an output impedance lower than a combined impedance of said cold-cathode tubes, said first low-impedance power source being connected to the electrode at one end of each of said cold-cathode tubes via said ballasts; a second low-impedance power source having an output impedance lower than the combined impedance of said cold-cathode tubes, said second low-impedance power source being connected to an electrode at the other end of each of said cold-cathode tubes; and a phase correction circuit for adjusting a phase difference between an output from said first low-impedance power source and an output from said second low-impedance power source, so that electrode potentials at both ends of each of said cold-cathode tubes change in opposite phase with respect to each other, wherein said phase correction circuit comprises a delay circuit for delaying one of a first pulse signal for instructing an output timing with respect to said first low-impedance power source and a second pulse signal for instructing an output timing with respect to said second low-impedance power source, from the other signal by a constant quantity.