Patent ID: 8111006

Claim:
A light emitting diode driving apparatus, comprising: a driving voltage generating section for generating a driving voltage fed to an anode of a light emitting diode; a driving current control section for performing pulse width modulation control of a driving current that flows through the light emitting diode; and a monitor voltage generating section that generates a monitor voltage corresponding to the driving voltage, wherein, the monitor voltage generating section, during an ON period of the driving current, generates an error voltage between a predetermined reference voltage and the monitor voltage and performs feedback control of the monitor voltage based on the error voltage such that the monitor voltage is equal to the reference voltage, and the monitor voltage generating section, during an OFF period of the driving current, holds and outputs, as the monitor voltage, the error voltage immediately before the driving current is turned off; and the driving voltage generating section performs feedback control of the driving voltage during an ON period of the driving current such that a feedback voltage derived from a cathode of the light emitting diode is equal to the reference voltage, and performs feedback control of the driving voltage during an OFF period of the driving current such that the monitor voltage is equal to the reference voltage.