Patent ID: 7427892

Claim:
A current source circuit, comprising: a voltage output section which outputs a voltage signal; a current source section having a plurality of current source blocks, each current source block comprising a plurality of current sources, each current source being arranged and configured to supply a respective output current and to output said output current from a respective current source block; and a conversion section which is connected between said voltage output section and said current source section and outputs a reference current to each of said plurality of current sources based on the voltage signal, such that the output current from each of said plurality of current sources is set based on the reference current and said output current is maintained based on sensing an amount of current output from said current source section, wherein each of said plurality of current sources comprises a transistor and a holding capacitor, and said conversion section comprises: a current setting resistance through which passes said current output from said current source section; and an amplifier which outputs the reference current based on the voltage signal, said current setting resistance, and said transistor in each of said current sources, wherein: said voltage output section comprises: a plurality of resistances connected in series between a first voltage and a second voltage; and a switch set connected to said plurality of resistances to output as the voltage signal, a voltage generated by said plurality of resistances and the first and second voltages, said amplifier comprises an operation amplifier which has an inversion input connected to receive the voltage signal from said voltage output section and an non-inversion input connected to one end of said current setting resistance, the other end of said current setting resistance being connected to receive a third voltage, and said operation amplifier outputs the reference current.