Patent ID: 7723922

Claim:
A light emitting diode driving device for driving a plurality of light emitting diode arrays each including a plurality of light emitting diodes connected in series to one another, the light emitting diode driving device comprising: a direct current/direct current converting part converting and outputting a direct current voltage inputted from the outside by switching of a switch into a driving voltage of a magnitude suitable for driving the plurality of light emitting diode arrays; a switching part comprising a plurality of switches each connected to one end of each of the light emitting diode arrays to switch on/off a current flowing through the each of the light emitting diode arrays; a constant current controlling part receiving at least one of information on the current flowing through the light emitting diode array and information on a voltage applied to the light emitting diode array by feed-back, the constant current controlling part comprising a pulse width modulation controller controlling a switching duty of the switch of the direct current/direct current converting part and controlling a switching duty of each of the switches of the switching part to allow the current to flow through the light emitting diode array with a predetermined magnitude; and a control logic receiving a control signal by a user and controlling the pulse width modulation controller in response to the control signal; wherein the direct current/direct current converting part comprises a multi-channel direct current/direct current converting part for driving the plurality of light emitting diode arrays individually through multiple channels, and the pulse width modulation controller controls a corresponding one of the LED arrays belonging to each of the channels individually.