Apparatus for driving light emitting device

An apparatus for driving a light emitting device, comprising:

• a current control unit generating a current control signal according to a preset current setting value;
• a constant current circuit unit varying a current resistance value according to the current control signal of the current control unit, detecting a current flowing in a light emitting unit comprising a plurality of emitting devices by using the current resistance value, and controlling the current flowing in the light emitting unit based on the detected current;
• a voltage control unit varying a voltage resistance value according to a preset voltage setting value, detecting a voltage supplied to the light emitting unit by using the voltage resistance value, and determining whether or not the voltage is in an over-voltage state, based on the detected voltage;
• a protection circuit unit generating a protection signal when the voltage is determined to be in an over-voltage state by the voltage control unit;
• and
• a driving control unit controlling the light emitting unit to be stopped when the protection signal is inputted from the protection circuit unit.