Patent ID: 7002303

Claim:
An organic EL panel drive circuit as an IC for current-driving an organic EL elements through terminal pins of an organic EL display panel, comprising: a plurality of pads provided correspondingly to said terminal pins; a plurality of D/A converter circuits having current-mirror circuits constructed with unit transistors and provided correspondingly to said pads, respectively, said D/A converter circuits adapted to generate analog currents corresponding to display data for luminous display of said organic EL elements; and a plurality of transistor blocks each having a rectangular area in which at least two columns of unit transistors are formed, a width of the rectangular area in a pad arranging direction substantially corresponding to n times a pad pitch, where n is a positive integer, wherein unit transistors constituting the D/A converter circuits are selected from the unit transistors of the transistor blocks and the D/A converter circuits constructed with the unit transistors of the outermost transistor blocks are dummy circuits, which are inoperable for driving the organic EL elements arranged in a matrix.