LIGHT EMITTING DIODE DRIVING CIRCUIT

摘要

Provided is a light emitting diode driving circuit which can highly accurately adjust emission luminance of a light emitting diode and suppress increase of a circuit size. The light emitting diode driving circuit is composed of a reference current section for generating a reference current, and a current outputting section for generating a driving current based on the reference current by using a current mirror circuit and supplying the light emitting diode with the driving current. The reference current section is provided with an operation amplifier which controls the reference current to have a voltage generated by reference current flow in a resistance circuit equal to a fixed reference voltage. The reference current section is also provided with a reference current switching circuit, which is a resistance circuit wherein a plurality of circuits, which connect resistors and transistors in series, with the reference resistors in parallel, voltages generated by the reference current flow is switched by turning on or off the transistor in the series connection circuit, and the reference current is switched.