Patent ID: 7446737

Claim:
A drive circuit IC of an organic EL display panel, which includes a plurality of current sources for outputting drive currents to a plurality of column lines or a plurality of data lines, comprising: a plurality of switch circuits; a plurality of resistors; a selector; and a switch scan circuit, wherein each of said plurality of switch circuits having one ends connected to one of output terminals, respectively, and the other ends of said plurality of switch circuits connected commonly, each of said plurality of resistors having one ends, and all said ends of said plurality of resistors connected to a predetermined potential line, said selector for selectively connecting the other ends of the plurality of the switches circuits to one of the other ends of the plurality of the resistors, and said switch scan circuit for selectively turning the plurality of switch circuits ON sequentially with a predetermined timing, and wherein the switch circuits and the switch scan circuit are provided in the IC, the output current is converted into a voltage by one of the plurality of the resistors, which is selected by the selector, for the test of the output current of the output terminal and the converted voltage value generated sequentially according to the scanning of the switch scan circuit is outputted from the IC.