Device for driving multi-channel light-emitting diode

A multi-channel Light Emitting Diode (LED) driving device, comprising:

• a power supply unit to supply externally supplied power;
• a light emitting diode block connected to a negative (−) terminal of the power supply unit, the light emitting diode block including a plurality of light emitting diode groups, each having at least one light emitting diode;
• a current commutation unit connected to an anode of the light emitting diode block, the current communication unit to commutate current flowing through the light emitting diode groups;
• a reference voltage unit electrically connected to the current commutation unit, the reference voltage unit to provide a reference voltage to the current commutation unit;
• and
• a current driving unit supplied with the power from the power supply unit, the current driving unit to drive the light emitting diode block via the current commutation unit and determine drive current flowing through the light emitting diode groups
• wherein the current commutation unit includes plurality of transistors, respectively, electrically connected to the light emitting diode groups included in the light emitting diode block, and
• wherein each of the plurality of transistors included in the current commutation unit comprises a collector connected to an anode of a corresponding light emitting diode group, a base electrically connected to the reference voltage unit, and an emitter directly coupled to other emitters of the plurality of transistors and to the current driving unit.