Patent ID: 6724376
Filing Date: 2004-04-20
Classification: H04B

Abstract:
An LED driving circuit comprising:a pulse generation circuit for shaping a waveform of an externally input signal and generating first and second pulses having a complementary relationship; a first voltage transfer circuit for applying to an LED a first output voltage of a low level on the basis of the first pulse, and a second voltage transfer circuit for applying to the LED a second output voltage of a high level on the basis of the second pulse, wherein the high level is substantially equal to a froward voltage for generating a forward peak current of the LED necessary for outputting light of a predetermined intensity from the LED, the low level is substantially equal to a voltage for changing an emission intensity of the LED to zero or a negligible value, and a real part of an output impedance of said pulse generation circuit is smaller than an internal series resistance of the LED.