Patent ID: 6744069
Filing Date: 2004-06-01
Classification: H01L

Abstract:
A semiconductor device having a plurality of thin-film transistors, each of said thin-film transistors in a pixel region comprising:a crystalline semiconductor film formed on an insulating surface of a substrate as an active layer, said active layer having at least one channel region and source and drain regions and including a halogen element; a gate electrode adjacent to said channel region with a gate insulating film interposed therebetween; a drain electrode connected to said drain region in said active layer; a shielding film comprising a conductive film over said drain electrode; and a pixel electrode over said shielding film, said pixel electrode connected to said drain electrode, wherein said crystalline semiconductor film comprises crystals each having a crystal structure that is continuous in a predetermined direction, and grain boundaries extending in said predetermined direction, said predetermined direction being at a predetermined angle with a direction connecting the source and drain regions of said thin-film transistor, wherein each of said thin-film transistors has an S value of 100 mV/dec or less, and wherein at least one of the thin-film transistors has LDD regions disposed between the channel region and the source and drain regions in the active layer.