Patent ID: 8530896

Claim:
A semiconductor device comprising: a pixel unit comprising: a semiconductor layer including a first region and a second region; a pixel TFT comprising the first region and a first gate electrode adjacent to the first region, wherein the first region comprising a first channel formation region, a first n type impurity region adjacent to the first channel formation region, and a second n type impurity region between the first channel formation region and the first n type impurity region; a protective insulation film disposed above the first gate electrode, the protective insulation film made of an inorganic insulating material; an inter-layer insulation film on the protective insulation film, the inter-layer insulation film made of an organic insulating material; a capacitance comprising the second region and a capacitance lead wire adjacent to the second region; an electrically conductive lead wire connected to the pixel TFT through a hole in at least the protective insulation film and the inter-layer insulation film; and a pixel electrode electrically connected to the electrically conductive lead wire and having a light transmitting property; and a driving circuit disposed around the pixel unit, the driving circuit comprising: a p channel type TFT comprising: a second gate electrode; a second channel formation region; and a p type impurity region adjacent to the second channel formation region; and a n channel type TFT comprising: a third gate electrode; a third channel formation region; a third n type impurity region adjacent to the third channel formation region; and a fourth n type impurity region between the third channel formation region and the third n type impurity region, wherein the pixel unit and the driving circuit are provided on a same substrate, wherein a concentration of the second n type impurity region is higher than a concentration of the first n type impurity region, and wherein a concentration of the fourth n type impurity region is higher than a concentration of the third n type impurity region.