Patent ID: 8859353

Claim:
A method of fabricating a semiconductor device having, on the same substrate, a pixel TFT disposed in a pixel unit and a driving circuit including a p channel type TFT and an n channel type TFT and disposed round the pixel unit, comprising the steps of: forming an underlying film over the substrate; forming island-like semiconductor layers over the underlying film; forming n type impurity regions having a first concentration, for forming LDD regions of the n channel type TFT and the pixel TFT in a selected region of the island-like semiconductor layers; forming high concentration n type impurity regions for forming source regions or drain regions outside the n type impurity regions; forming a p type impurity region having a third concentration, for forming a source region or a drain region of the p channel type TFT in a selected region of the island-like semiconductor layers; forming a protective insulation film formed of an inorganic insulating material above gate electrodes of the n channel type TFT, the pixel TFT and the p channel type TFT; foaming an inter-layer insulation film formed of an organic insulating material in contact with the protective insulation film; forming a conductive metal lead wire to be electrically connected to the pixel TFT; and forming a pixel electrode comprising a transparent conductor film to be electrically connected to the conductive metal lead wire, on the inter-layer insulation film, wherein the step of forming the p type impurity region having the third concentration is conducted after the step of forming the protective insulation film so that an offset region is formed between a channel formation region of the p channel type TFT and the p type impurity region having the third concentration.