Laser irradiation device and method of fabricating organic light emitting display device using the same

A laser irradiation device for laser-induced thermal imaging, the device comprising:

• a laser source configured to generate a laser beam;
• and
• a mask configured to selectively pass the laser beam therethrough toward a projection plane, the mask comprising a light transmitting portion, wherein the light transmitting portion has a first length measured in a first axis and a second length measured in a second axis substantially perpendicular to the first axis, wherein the first length varies along the second axis, wherein the first length is greater at both ends of the light transmitting portion along the second axis than the center between the both ends, wherein the mask is configured to move relative to the projection plane along the first axis.