An organic light emitting display is provided with a height of a pixel defining layer formed on a planarization layer in a region where a first electrode is not formed, being formed to be lower than or equal to that of the pixel defining layer formed on the first electrode. The system further includes a plurality of rolling tires in respective rolling location. A tab may be provided on the base to lock the pad in position. At least one metal dam is formed on the first semiconductor die between the at least one metal pillar of the first semiconductor die and the at least one bond pad.