Patent ID: 7427977

Claim:
A lamp driving device for driving a plurality of lamps in a liquid crystal display device, comprising: an inverter substrate; a plurality of transformers on the inverter substrate to supply a high voltage AC waveform to each of the lamps; a plurality of pattern capacitors on the inverter substrate to limit the electric current supplied to each of the lamps, the pattern capacitors including a plurality of capacitor patterns on a front surface of the inverter substrate with a designated distance therebetween and a first ground line on a rear surface of the inverter substrate overlapping the capacitor patterns; a feedback substrate connected to a low voltage electrode of each of the lamps; a feedback circuit mounted on the feedback substrate to detect a tube current of the lamps to generate a feedback signal; a feedback cable connected between the feedback circuit and the inverter substrate to supply the feedback signal to the inverter substrate; a plurality of inverter integrated circuits arranged in series on the inverter substrate with a designated distance therebetween to convert a lamp drive voltage supplied from the outside by use of a switching device into an AC waveform; a main integrated circuit disposed on the inverter substrate to control the inverter integrated circuits, wherein the plurality of transformers is arranged in series on the inverter substrate to convert the AC waveform from the inverter integrated circuits to a high voltage AC waveform and to supply the high voltage AC waveform to the pattern capacitors; a plurality of output connectors arranged at an edge portion of the inverter substrate and connected with the pattern capacitors to output the high voltage AC waveform from each of the transformers to a high voltage electrode of each of the lamps; a second ground line formed on the rear surface of the inverter substrate to supply a ground voltage to the inverter integrated circuit; a connecting line to connect the first ground line with the second ground line; and a plurality of feedback signal lines disposed between the first ground line and the second ground line to provide the feedback signal, supplied through the feedback cable, to the inverter integrated circuits; wherein a distance between the first ground line and the feedback signal line is at least 10 mm.