Patent ID: 6909114
Filing Date: 2005-06-21
Classification: H01L

Abstract:
1. A semiconductor device having an active matrix display device, said display device comprising: a first thin film transistor formed over an insulating surface; a pixel electrode electrically connected to said first thin film transistor; a driver circuit including a second thin film transistor formed over said insulating surface for driving said first thin film transistor, wherein said first thin film transistor comprises: wherein said gate electrode comprises at least a first conductive layer and a second conductive layer formed on the first conductive layer, said first conductive layer having a pair of tapered portions which extend beyond side edges of the second conductive layer, wherein the pair of lightly doped regions has a pair of first portions which are overlapped by the pair of tapered portions of the first conductive layer, and a pair of second portions which extend beyond side edges of the first conductive layer, and wherein said insulating film is in direct contact with at least side surfaces and a top surface of the second conductive layer.