Patent ID: 7892955

Claim:
A method for fabricating a display device comprising: forming a plurality of gate lines and data lines on a substrate, the gate and data lines crossing each other to define pixels; and forming a thin film transistor (TFT) near each crossing in the pixel, this step further including, forming a semiconductor layer on the substrate; positioning a mask over the substrate, the mask having first, second and third blocks, each block having a periodic pattern including a plurality of transmitting regions and a blocking region, the periodic pattern of the first block having a first position, the periodic pattern of the second block having a second position, the periodic pattern of the third block having a third position, the first, second and third positions being different from each other wherein when the three periodic patterns are projected in one block, the adjacent three transmitting regions form one equilateral triangle, and six of the equilateral triangles form a regular hexagon; crystallizing the semiconductor layer by irradiating a laser beam through the mask.