Organic EL drive circuit and organic EL display device using the same

An organic EL display device comprising:

• an organic EL display panel;
• a D/A converter circuit including a current mirror type current output circuit for outputting currents to terminal pins of said organic EL display panel and a current mirror circuit having a plurality of output side transistors connected in parallel to form a current mirror connection and a plurality of input side transistors driven with a predetermined drive current, the plurality of said output side transistors corresponding to bit positions of a display data, respectively, said D/A converter circuit selectively operating correspondingly to the input display data to drive said current mirror type current output circuit by generating an analog current corresponding to the display data as a total of currents flowing through said output side transistors;
• a switch circuit connected in series with at least one of the plurality of said input side transistors;
• a current source for driving the plurality of said input side transistors with a predetermined constant current;
• and
• a control portion for ON/OFF controlling said switch circuit,
• wherein, when said switch circuit is in ON stage and a value of the analog current from said D/A converter circuit becomes larger than that corresponding to the number of bits of the display data, which can be converted into analog current value, said control portion turns said switch circuit OFF to set the display data corresponding to the number of the bits or smaller in said D/A converter circuit to thereby generate the large analog current value.