Patent ID: 7291862

Claim:
A thin film transistor substrate, comprising: a transparent insulating substrate which includes a display area and a peripheral area; a large number of pixel thin film transistors which are disposed in a matrix manner on the display area, each of said pixel thin film transistors including a channel made of a polycrystalline semiconductor film whose mobility is higher in a first direction than in another direction, a channel length direction being in line with the first direction, and channels included in a plurality of pixel thin film transistors being disposed respectively in stripe areas each of which has a predetermined width and is elongate in the first direction; and a plurality of peripheral circuits which are disposed in the peripheral area so as to be positioned on a portion including extended portions of the stripe areas and which include a plurality of thin film transistors each made of a polycrystalline semiconductor film whose mobility is higher in a second direction crossing the first direction than in another direction, at least one peripheral circuit out of said plurality of peripheral circuits including a high speed thin film transistor whose channel length direction is in line with the second direction, and a channel of the high speed thin film transistor being positioned on a portion other than the extended portions of the stripe areas.