APPARATUS FOR OPERATING LIGHT EMITTING DIODE

摘要

PURPOSE: Apparatus for operating light emitting diode is provided to minimize lines by using a signal line to turn on a plurality of LED in order. CONSTITUTION: A reference clock generator(111) generates a reference clock. A reference voltage generator(117) generates a reference voltage. An analogue-digital converter(112) converts an input signal to a digital signal. A digital-analogue converter(113) converts a digital signal to an analogue signal. A frequency demultiplier(115) divides a reference clock. A current amplifier(116) turns on LED. A main block(110) includes control logic. Control logic applies a current to a current amplifier by controlling a frequency demultiplier according to a digital code. A bypass switch(130) has an input signal bypass to a next LED driving device. Watch-dog(120) measures an applied voltage to a LED voltage resistance.