Patent ID: 6332661
Filing Date: 2001-12-25
Classification: G09G

Abstract:
A constant current driving apparatus which drives a plurality of loads at a same current, comprising:a plurality of constant current driving semiconductor integrated circuits less in number than a total number of the loads; anda reference signal producing circuit for producing a reference signal, each of the constant current driving semiconductor integrated circuits being formed of circuit elements integrated on a single semiconductor chip, and includinga drive circuit having one or more reference input terminals, and two or more output terminals for driving two or more of the loads at a constant current corresponding to the reference signal inputted to the reference input terminal, anda control circuit having driving input terminals for the loads for on-off-controlling outputs of the individual output terminals of the drive circuits in accordance with input signals to the driving input terminals, the reference signal producing circuit being formed of circuit elements integrated on a single semiconductor chip, for supplying same reference signals, to the reference input terminals of the driver circuits in the plurality of constant current driving semiconductor integrated circuits.