Patent ID: 8054009

Claim:
A lamp driving device comprising: a plurality of lamps, each lamp having a first electrode and a second electrode; a first substrate capable of supplying a current having a first phase to the first electrodes of the plurality of lamps; a plurality of first capacitors connected in series with the first electrodes of the plurality of lamps, each first capacitor having one terminal connected to a corresponding first electrode of the plurality of lamps; a first board capacitor formed of a portion of the first substrate and connected in parallel with at least one first capacitor of the plurality of first capacitors; a second substrate capable of supplying a current having a second phase to the second electrodes of the plurality of lamps; a plurality of second capacitors connected in series with the second electrodes of the plurality of lamps; and a second board capacitor formed of a portion of the second substrate and connected in parallel with at least one second capacitor of the plurality of second capacitors, wherein the first board capacitor is connected to the one terminal of the at least one first capacitor of the plurality of first capacitors and the corresponding first electrode of the plurality of lamps to which the one terminal is connected, wherein the first board capacitor has a first capacitance by the configuration of upper and lower patterns of the first substrate and a dielectric between the upper and lower patterns of the first substrate, and wherein the second board capacitor has a second capacitance by the configuration of upper and lower patterns of the second substrate and a dielectric between the upper and lower patterns of the second substrate.