Patent ID: 6867755

Claim:
An EL device driving device comprising: an EL device having two electrodes; a first EL driving IC having a first output terminal connected to one electrode of the EL device, a first input terminal, and a first controller for turning on or off an alternating current flowing between the first output terminal and the first input terminal; a second EL driving IC having a second output terminal connected to the other electrode of the EL device, a second input terminal, and a second controller for turning on or off an alternating current flowing between the second output terminal and the second input terminal; a first AC power supply for supplying an AC voltage, one electrode of the first AC power supply being connected to the first input terminal, and the other electrode of the first AC power supply being connected to a ground potential point; and a second AC power supply for supplying an AC voltage having the same waveform as the AC voltage supplied from the first AC supply, and shifted in phase 180 degrees, one electrode of the second AC power supply being connected to the second input terminal, and the other electrode of the second AC power supply being connected to the ground potential point; wherein said AC voltages arc substantially sinusoidal waveforms.