Patent ID: 7532207

Claim:
A drive circuit, comprising: a plurality of current signal generation circuits for outputting a current signal to each of a plurality of display units; a current signal output line to which outputs of said plurality of current signal generation circuits are commonly connected; a control circuit for controlling each of said plurality of current signal generation circuits to be a current signal output state capable of evaluating an output of one of said plurality of current signal generation circuits; a correction value output circuit for evaluating the output of the one of said plurality of current signal generation circuits on a basis of the current values output through said current signal output line to output a correction value according to an evaluation result; and a correction circuit for correcting an image signal supplied to said plurality of current signal generation circuits by means of the correction value, wherein said control circuit supplies a predetermined signal to the one of said plurality of current signal generation circuits, and supplies a signal different from the predetermined signal to the other current signal generation circuits.