Patent ID: 6992328

Claim:
A semiconductor device provided with a pixel TFT formed in a pixel portion and a driver circuit having a p-channel TFT and an n-channel TFT formed in the periphery of the pixel portion on the same substrate, wherein: the n-channel TFT of said driver circuit has a gate electrode having a taper portion, a channel forming region, a first impurity region for forming an LDD region provided so as to overlap the gate electrode and so as to be in contact with the channel forming region, and a second impurity region for forming a source region or a drain region provided outside the first impurity region; the p-channel TFT of said driver circuit has a gate electrode having a taper portion, a channel forming region, a third impurity region for forming an LDD region provided so as to overlap the gate electrode and so as to be in contact with the channel forming region, and a fourth impurity region for forming a source region or a drain region provided outside the third impurity region; the pixel TFT has a gate electrode having a taper portion, a channel forming region, a first impurity region for forming an LDD region provided so as to overlap the gate electrode and so as to be in contact with the channel forming region, and a second impurity region for forming a source region or a drain region provided outside the first impurity region; a concentration of an impurity element of one conductivity in the first impurity region and a concentration of an impurity element of opposite conductivity in the third impurity region become higher as the distance from the channel forming regions to which the respective impurity regions are adjoined to increases; and a pixel electrode provided in said pixel portion has a light reflective surface, is formed on a second interlayer insulating film made of an organic insulating material, and is connected to the pixel TFT via an opening provided at least in a first interlayer insulating film made of an inorganic insulating material formed above the gate electrode of the pixel TFT and in the second interlayer insulating film formed in contact with the top surface of the first interlayer insulating film.