Patent ID: 7700892

Claim:
A sequential lateral solidification device, comprising: a laser generating device irradiating a laser beam; a focusing lens focusing the irradiated laser beam; a mask having a plurality of line patterns of transparent region through which the irradiated laser beam is transmitted in a laser beam pattern; a reduction lens reducing the laser beam pattern; a moveable stage; an aperture controlling pattern between the mask and the moveable stage; a substrate having a silicon layer mounted on the moveable stage, the substrate having a pixel area and a driving area defined thereon and exposed to the irradiated laser beam pattern, wherein the pixel area includes a plurality of pixels separated by a plurality of gate line areas and a plurality of data line areas crossing each other, and the driving area includes a device forming area and a device non-forming area; a plurality of position sensors arranged at edges of the substrate and configured to be moved to edge portions of the laser beam pattern irradiated onto the silicon layer, wherein the plurality of position sensors transmit information indicating the position of each position sensor to control an overlapping area between adjacently irradiated laser beam patterns; an attenuator controlling a size of the laser beam irradiated from the laser beam generator in accordance with a size of the pixel to be formed on the substrate; wherein the moveable stage and the aperture controlling pattern are controlled based on the information from the plurality of position sensors over the position of the laser beam pattern irradiated on the substrate and positions of the gate and data line areas of the pixel area and the non-forming area of the driving area on the substrate and wherein the moveable stage moves in increments equal to a multiple of a length (x) and a width (y) of pixels to be formed within the pixel area so that an overlapping area between adjacently irradiated laser beam patterns is located within the gate and data line areas of the pixel area and within the device non-forming area of the driving area.