Organic light emitting display and fabricating method thereof

An organic light emitting display comprising:

• a substrate having a display region and a non-display region;
• a buffer layer formed on the display region and the non-display region in which a catalytic metal is present;
• an alignment mark formed on one of the buffer layer and the substrate in the non-display region of the substrate;
• an active layer formed by an SGS crystallization method on the buffer layer corresponding to the display region of the substrate;
• a gate insulating layer formed on the alignment mark and the active layer;
• a gate electrode formed on the gate insulating layer corresponding to the active layer;
• an interlayer dielectric layer formed on the gate insulating layer;
• a source/drain electrode formed on the interlayer dielectric layer and electrically coupled to the active layer;
• an insulating layer formed on the source/drain electrode;
• and
• an organic light emitting diode formed on the insulating layer and electrically coupled to the source/drain electrode,
• wherein the active layer is formed at a predetermined distance from the alignment mark.