A laser beam pattern mask includes at least one or more transmitting parts, each transmitting part having a central portion and a pair of edge portions provided to both sides of the central portion, each having a substantially triangular shape defined by a virtual boundary line between the central portion...http://www.google.de/patents/US7132204?utm_source=gb-gplus-sharePatent US7132204 - Laser beam pattern mask and crystallization method using the same
