Patent ID: 8531116

Claim:
An apparatus for driving a light source, comprising: a plurality of light emitting diode (LED) strings; and a light emitting diode (LED) driving circuit configured to drive the LED strings, and comprising a plurality of channels commonly connected to the same LED string, wherein the LED driving circuit comprises: a pulse controller configured to generate a pulse signal to control luminosity of each of the LED strings, a current controller comprising a plurality of channel switches configured to control a magnitude of a current signal provided to each of the LED strings in response to the pulse signal, and a current detector located between the pulse controller and the current controller, the current detector configured to: detect current values of pulse signals provided to the channel switches, and compare the detected current values with one another, and wherein the pulse controller is further configured to control duty ratios of the channel switches when the current values detected by the current detector is different from one another, such that the pulse signals provided to the channel switches connected to the LED string have a same current value.