A transistor for detecting current generated by an output side transistor
of a current mirror circuit of an organic EL panel drive circuit and a
control circuit including a current driven input stage and an output
stage for driving the input side transistor of the current mirror circuit
are provided. The input stage of the control circuit receives the
detected current and a certain reference current and the output stage of
the control circuit generates a drive current, which corresponds to a
difference between the detected current and the certain reference current
and drives the input side transistor of the current mirror circuit. The
control circuit controls the detected current in such a manner that it
becomes equal to the reference current and the current distributed to
terminal pins of an organic EL panel becomes the reference current or a
current corresponding thereto.