An organic light emitting device driver for driving an organic light emitting device including a plurality of unit pixels each of which includes an organic light emitting element, the organic light emitting device driver includes: a discharge unit for generating a discharge current during a discharge period to thereby discharge a charge charged in the unit pixel, wherein the discharge unit includes: a switching unit for transferring a reference current in response to a predetermined voltage supplied to the unit pixel; and a current mirroring unit for outputting the discharge current generated by mirroring the reference current transferred by the switching unit.