Patent ID: 7569793

Claim:
A sequential lateral solidification (SLS) device comprising: a laser beam generator; a mask having an alignment key area and a crystallization area; a mask stage, the mask being mounted over the mask stage, the mask stage being moved to transmit the laser beam through a selected area of the mask; and a substrate stage for moving a substrate, to change portions of the substrate irradiated with the laser beam passing through the mask, wherein the substrate has a display part including a plurality of pixels and a non-display part including a driving circuit, wherein the crystallization area of the mask is divided into a first area and a second area, the first area corresponding to the display part of the substrate, the second area corresponding to the non-display part of the substrate, and wherein the first area includes at least one pattern block having a plurality of transmission parts and non-transmission parts, the pattern block having a size corresponding to a semiconductor layer of one pixel in the substrate.