Patent ID: 6563136
Filing Date: 2003-05-13
Classification: H01L

Abstract:
A thin-film semiconductor device comprising:a pixel array section having pixel electrodes and multi-gate-type thin-film transistors for pixels which switch the pixel electrodes; and a peripheral circuit section arranged around the pixel array section, said peripheral circuit section having driving circuits each having single-gate-type thin-film transistors for circuits which drive the thin-film transistors for pixels, said thin-film transistors each having a laminate structure having a semiconductor thin film, a gate electrode, and a gate insulating film interposed between them, and said semiconductor thin film having a channel region inside the end of the gate electrode, a lightly doped region outside said channel region, a heavily doped region outside said lightly doped region, and a concentration boundary which separates said lightly doped region and said heavily doped region from each other, wherein said concentration boundary measured from an end of said gate electrode is positioned more inside in said single-gate-type thin-film transistors for circuits than in said multi-gate-type thin-film transistors for pixels, wherein the concentration boundary of the thin-film transistors for circuits is positioned outside as much as a first distance from the end of the gate electrode and the concentration boundary of the thin-film transistors for pixels is positioned outside as much as a second distance from the end of the gate electrode, with the first distance being shorter than the second distance, and wherein each thin-film transistor has the laminate structure of a bottom gate type in which the semiconductor thin film is placed on the gate electrode with a gate insulating film interposed between them.