Patent ID: 6541294
Filing Date: 2003-04-01
Classification: G02F,H01L

Abstract:
A semiconductor device comprising a pixel TFT disposed in a pixel section and a driver circuit comprising a p-channel TFT and an n-channel TFT disposed in a periphery of the pixel section, over a substrate, wherein:the n-channel TFT of the driver circuit comprises: a gate electrode which has a tapered portion; a channel forming region; a first impurity region which forms an LDD region that is disposed in contact with the channel forming region and so as to partly overlap the gate electrode; and a second impurity region which forms a source region or a drain region that is disposed on the outside of the first impurity region; the p-channel TFT of the driver circuit comprises: a gate electrode which has a tapered portion; a channel forming region; a third impurity region which forms an LDD region that is disposed in contact with the channel forming region and so as to overlap the gate electrode; and a fourth impurity region which forms a source region or a drain region which is disposed on the outside of the third impurity region; the pixel TFT comprises a gate electrode which has a tapered portion; a channel forming region; a first impurity region which forms an LDD region that is disposed in contact with the channel forming region and so as to partly overlap the gate electrode; and a second impurity region which forms a source region or a drain region that is disposed on the outside of the first impurity region; a concentration of an impurity element of one conductivity type in a region of the first impurity region that overlaps the gate electrode and a concentration of an impurity region of the other conductivity type in the third impurity region are set to become higher as the distance from channel forming regions that are in contact increase; and a pixel electrode that is disposed in the pixel section and has a light reflective surface is formed over a second interlayer insulating film comprising an organic insulating material; and is connected to the pixel TFT through an opening disposed at least in a first interlayer insulating film comprising an inorganic insulating material which is disposed over the gate electrode of the pixel TFT and in the second interlayer insulating film formed in close contact with the insulating film.