Patent ID: 7858987
Filing Date: 2010-12-28
Classification: G02F,H01L

Abstract:
1. A semiconductor device comprising: a driver circuit including a first n-channel TFT and a p-channel TFT, and a pixel portion including a second n-channel TFT; wherein each of the first gate electrode, the second gate electrode, and the third gate electrode has a tapered side surface, wherein the pair of first impurity regions are overlapped with the tapered side surface of the first gate electrode, wherein the pair of second impurity regions are not overlapped with the first gate electrode, wherein the pair of fifth impurity regions are not overlapped with the third gate electrode, wherein the pair of third impurity regions contain an impurity imparting n-type at a higher concentration than that of the pair of first impurity regions and the pair of second impurity regions, and wherein the pair of sixth impurity regions contain an impurity imparting n-type at a higher concentration than that of the pair of fifth impurity regions.