Patent ID: 6624013
Filing Date: 2003-09-23
Classification: H01L

Abstract:
A method of manufacturing an electric device in combination with an active matrix display device, the active matrix display device comprising:a pixel portion including at least a pixel thin film transistor over a substrate; a driver circuit portion including at least a thin film transistor over the substrate; the method comprising: forming an amorphous semiconductor island over a first surface of the substrate; crystallizing the amorphous semiconductor island to form a crystalline semiconductor island; forming a gate electrode adjacent to the crystalline semiconductor island with a gate insulating film interposed therebetween; introducing an impurity into the crystalline semiconductor island to form at least a source region, a drain region and a channel forming region between the source and drain regions; forming an insulating film over the crystalline semiconductor island, the gate electrode and the gate insulating film; forming at least an electrode electrically connected to one of the source and drain regions through a contact hole in the insulating film, wherein the crystallizing step comprises: irradiating a laser light from a side of a first surface of the substrate; reflecting a part of the laser light by a reflection plate being located adjacent to a second surface of the substrate, the second surface being opposed to the first surface of the substrate; and irradiating the reflected laser light to the amorphous semiconductor island from a side of the second surface of the substrates, and wherein the electric device is one selected from the group consisting of a display device using an organic electronic luminescent material, a personal computer, a video camera, a portable information terminal, a digital camera, a digital video disk player, a goggle-type display, an electronic game device, and a projector.