Patent ID: 7879700

Claim:
A silicon crystallization system comprising: a beam generator generating a laser beam; first and second optical units for controlling the laser beam from the beam generator; and a stage for mounting a panel including an amorphous silicon layer to be polycrystallized by the laser beam from the first and second optical units, wherein the first optical unit makes a first laser beam having a transverse edge and a longitudinal edge longer than the transverse edge, wherein the second optical unit makes a second laser beam having a transverse edge and a longitudinal edge shorter than the transverse edge, wherein the panel comprises a display panel including a display area and a gate driving circuit area illuminated by the first laser beam through a two shot mask, and a data driving circuit area illuminated by the second laser beam through a multi-shot mask, wherein the two shot mask has a plurality of slits for defining areas transmitting the first laser beam and forming two columns, and wherein the multi-shot mask has a plurality of slits for defining areas transmitting the second laser beam and forming three or more columns.