A laser irradiation apparatus is disclosed. In one embodiment, the apparatus includes i) an X-axis location control board configured to move a plurality of drivers in an X-axis direction and ii) a plurality of output heads cooperatively arranged with the drivers and configured to move with movement of the drivers, wherein the output heads are configured to receive laser beams. The apparatus may further include a Z-axis location control board cooperatively arranged with the X-axis location control board and configured to move the X-axis location control board in an Z-axis direction, wherein the output heads alternatively protrude with different lengths along an Y-axis direction.