Patent ID: 7876297

Claim:
An organic EL drive circuit including a D/A converter circuit constructed with a current minor circuit having an input side transistor supplied with a predetermined current and a plurality of output side transistors for supplying a drive current or a current on which the drive current is generated, to a predetermined output terminal of the D/A converter circuit to be outputted to terminal pin of an organic EL panel, by converting digital display data into analog signal by the D/A converter circuit, comprising a series circuit of a first transistor and a second transistor, said series circuit being provided between each of said output side transistors of said current minor circuit and said predetermined output terminal, wherein withstand voltage of said input side transistor and said output side transistors of said current minor circuit is lower than withstand voltage of said first transistor and said second transistors, said input side transistor is connected to a first power source line through a circuit element or a certain circuit and said series circuit is connected to a second power source line having a voltage higher than a voltage of said first power source line through another circuit element or another certain circuit; wherein said series circuit is formed by series-connecting two output side terminals of each of the first and second transistors between said second power source line and a reference potential line, an output side terminal of said first transistor, which is not connected to said second transistor, is connected to an output of said output side transistor and an output side terminal of said second transistor, which is not connected to said first transistor, is connected to said predetermined output terminal; wherein a plurality of said first transistors are provided and a plurality of said output side transistors are provided, each of said first transistors is connected to one or a plurality of outputs of said output side transistors commonly and the other terminals of said first transistors are connected to another output side terminal of said second transistors; and wherein each of the plurality of said output side transistors is constructed as transistor cell which includes a plurality of transistors connected in series, a certain number of said output side transistors is constituted with said transistor cells connected in parallel correspondingly to weights of digits of said D/A conversion.