Patent ID: 7288903
Filing Date: 2007-10-30
Classification: H05B,Y02B

Abstract:
1. A driving device of a light source for a display device, the light source including a plurality of lamps connected in parallel to each other and each lamp having a first terminal and a second terminal, the device comprising: a lamp state sensing unit sensing driving voltages applied to the respective lamps, comparing the sensed driving voltages to a reference voltage, and outputting a lamp state sensing signal having an information informing an over-current state for at least one lamp; and an inverter turning the lamps on or off by applying AC voltages to the lamps and controlling the AC voltages based on the lamp state sensing signal, wherein the reference voltage is defined based on one of the AC voltages from the inverter and is varied depending on a magnitude of one of the AC voltages applied to the respective lamps.