Patent ID: 7652650

Claim:
A current output type drive circuit for outputting a drive current to a driven object shared by being divided into a plurality of areas, comprising a plurality of drivers arranged corresponding to each the shared area of the driven object, each driver comprising an output means for outputting a supplied reference current and the drive current corresponding to image data to a corresponding shared area of the driven object and a reference current source circuit for sampling and holding the reference current input from a reference current input terminal, then supplying the same to the output means, wherein each driver is a driver outputting currents of a plurality of channels in accordance with input data, further comprises a register array for holding said input data, and further comprises means for increasing the reference current sampled and held by the reference current source circuit to a plurality of reference currents by further copying or distributing them by time division, and said output means comprises a plurality of conversion circuits for receiving said plurality of reference currents and outputting currents in accordance with the data held by the register array and a current output circuit comprising a first group of current sampling circuits and a second group of current sampling circuits operating alternately in a current write mode and current read mode in accordance with the output currents of the conversion circuits.