Patent ID: 7927935
Filing Date: 2011-04-19
Classification: B23K,C30B,G02B,H01L

Abstract:
1. A method for crystallizing a semiconductor, comprising the steps of: irradiating a laser beam onto the semiconductor on a substrate having a display region and a peripheral region around the display region to melt and crystallize the semiconductor; performing crystallization of the peripheral region in a first scanning direction; after rotating a rotatable stage supporting the substrate by 90 degrees, performing crystallization of the peripheral region in a second scanning direction perpendicular to the first scanning direction; and wherein crystallization of the display region is performed in a third scanning direction perpendicular to a direction of a long side of a rectangle of sub-pixel regions, wherein laser scanning of the peripheral region along the first scanning direction is performed by: first, performing laser scanning along a forward direction of the first scanning direction; next, moving an initial position of the laser scanning to a direction perpendicular to the first scanning direction; and subsequently, performing laser scanning along a direction opposite to the first scanning direction; and performing the laser scanning so that an end portion of an irradiated region in the laser scanning in the forward direction and an end portion of an irradiated region in the laser scanning in the opposite direction overlap each other.