Patent ID: 8486586

Claim:
A laser irradiation device for laser-induced thermal imaging in order to form an organic layer, 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 first length is smallest at the center and only increases as it approaches both ends, wherein the mask is configured to move relative to the projection plane along the first axis; wherein the first length changes by at least about 5% stepwise at least four times along the second axis; wherein the first length of the ends is about 1.1 to 1.5 times of the first length of the center; wherein the laser beam has different doses in at least two regions having different first lengths; and wherein the second length of the center portion is larger than the second length of any portion with a first length larger than the first length of the center portion.