Mother Substrate of Organic Light Emitting Display Capable of Sheet Unit Test and Testing Method Thereof

The present invention relates to a mother substrate of an organic light emitting display device so as to prevent the brightness deviation at the time of checking the ledger doedoe designed to yet employing a pixel circuit of a simple structure ledger inspection. A mother substrate of an organic light emitting display device according to the invention, of the plurality of organic light emitting display devices arranged in a matrix type panel and is formed on the outer region of the panel in a first direction, a power source for testing supplied from outside or the first wire group comprising a plurality of ledger wiring for transmitting a signal to said panel, is formed in the second direction in the outer region of the panel to pass power or signal for testing supplied from outside into the panel connected to the second wire group including a plurality of different ledger lines, ledger wiring the first and second pass ledger scan signal of the ledger wire included in the wire group, the connection wiring for connecting the panels to each and and by subtracting a voltage equivalent to the threshold voltage of the driving transistor provided in the pixels of the panel supplied to the panel from the scan signal ledger Compensation unit comprises.