Patent ID: 7309964

Claim:
A floating driving device, comprising a plurality of illumination units, each of which has a first terminal and a second terminal, and the second terminals of the plurality of illumination units are electrically coupled together at a common voltage node; a first driver electrically coupled to the first terminals of a first pair of illumination units of the plurality of illumination units, for applying AC voltages to the first terminals, wherein a first output end of the first driver is coupled to a first one of the first terminals of the first pair of illumination units and a second output end of the first driver is coupled to a second one of the first terminals of the first pair of illumination units; a second driver electrically coupled to the first terminals of a second pair of illumination units of the plurality of illumination units, for applying AC voltages to the first terminals, wherein a first output end of the second driver is coupled to a first one of the first terminals of the second pair of illumination units and a second output end of the second driver is coupled to a second one of the first terminals of the second pair of illumination units; a first balance circuit connected to the first driver; and a second balance circuit connected to the second driver, wherein said first and second balance circuits having impedance that is adjusted to generate balancing output signals from the first driver and the second driver to the plurality of the illumination units, wherein the first driver is coupled between the plurality of illumination units and the first balance circuit and the second driver is coupled between the plurality of illumination units and the second balance circuit.