Patent ID: 8741535

Claim:
A method of making a display device, comprising: providing a partially fabricated display device; providing a laser irradiation device, comprising a mask and a laser source configured to generate a laser beam; placing a donor device between the partially fabricated display device and the laser irradiation device, the donor device comprising a transferable layer, wherein the transferable layer faces the partially fabricated display device; and irradiating a laser beam through the mask onto a surface of the donor device, the surface facing the laser beam, while moving the laser beam relative to the donor device along a first axis, wherein the mask comprises a light transmitting portion, wherein the light transmitting portion has a first length measured in the 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 both ends, wherein the mask is configured to move relative to the projection plane along the first axis; and wherein the first length changes by at least about 5% stepwise at least four times along the second axis and wherein the second length of the center is larger than the second length of any portion with a first length larger than the first length of the center.