Patent ID: 8653754
Filing Date: 2014-02-18
Classification: G05F,H03F

Abstract:
1. A current driving circuit configured to generate a driving current being supplied to a light emitting element being driven, the current driving circuit comprising: a reference voltage input terminal configured to receive an external reference voltage from an external circuit; a resistor connection terminal via which an external resistor is connected as an external component; an output terminal via which the light emitting element is connected; a reference voltage generating unit configured to generate an internal reference voltage; a transistor arranged such that one terminal thereof is connected to the resistor connection terminal; and an operational amplifier including first and second non-inverting input terminals and a single inverting input terminal, configured to output, via an output terminal thereof, a voltage that corresponds to the difference between a voltage input to the inverting input terminal and a lower voltage selected from among voltages input to the first and second non-inverting input terminals, and arranged such that the output terminal thereof is connected to a control terminal of the transistor, the internal reference voltage is input to the first non-inverting input terminal thereof, the external reference voltage is input to the second non-inverting input terminal thereof, and the inverting input terminal thereof is connected to the resistor connection terminal, wherein, in a state in which the external resistor is connected between the resistor connection terminal and a ground terminal, a driving current that corresponds to a current that flows through the transistor is output via the output terminal.