Patent ID: 7542684

Claim:
A light emitting diode driving circuit for driving a light emitting diode, comprising: a driving current generating circuit generating a driving current for the light emitting diode in accordance with a driving pulse signal supplied from outside; a peaking current generating circuit generating a peaking current obtained by differentiating the driving pulse signal; and a peaking current control circuit controlling a magnitude of the peaking current generated from the peaking current generating circuit, a current that is equal to a sum of the driving current and the peaking current flowing to the light emitting diode, wherein: the driving current generating circuit includes: a constant current circuit; and a switching circuit provided between the constant current circuit and the light emitting diode, for carrying out ON-OFF control of the light emitting diode in accordance with the driving pulse signal, and the peaking current generating circuit includes a first differentiating circuit, wherein the first differentiating circuit comprises: a first resistor whose one end is connected with a cathode of the light emitting diode; a first capacitor whose one end is connected with another end of the first resistor; an inverter circuit to which the driving pulse signal is inputted; and a MOS transistor whose drain is connected with another end of the first capacitor, source is connected with an output terminal of the inverter circuit, and gate receives a control voltage for controlling the peaking current.