(C) Particularly, since the dual gate type MOSTFT is used in the peripheral driving circuit, cMOS, nMOS or pMOS TFT having a driving performance 1.5 to 2 times as high as the single gate TFT can be constituted, to provide TFT of higher performance and larger driving performance, which is suitable particularly in a case of requiring a large driving performance TFT to a portion of the peripheral dri