Patent ID: 7545357

Claim:
A display device including a plurality of pixels and a driver circuit to drive said plurality of pixels, said driver circuit including a level converter circuit formed on an insulating substrate and comprised of MISTFTs (Metal Insulator Semiconductor Thin Film Transistors) of a same conductivity type and having semiconductor layers comprised of polysilicon, said level converter circuit comprising a first MISTFT, a second MISTFT, and a third MISTFT, a first terminal of said first MISTFT being coupled to an input terminal for receiving an input pulse, a gate terminal of said first MISTFT being coupled to a fixed-voltage power supply line, a first terminal of said second MISTFT being coupled to a low-voltage power supply line, a gate terminal of said second MISTFT being supplied with a pulse equal in magnitude and opposite in phase with respect to said input pulse, a second terminal of said first MISTFT being coupled to a gate terminal of said third MISTFT and a first terminal of a capacitor, a first terminal of said third MISTFT being coupled to a high-voltage power supply line, and a junction point of a second terminal of said second MISTFT, a second terminal of said third MISTFT, and a second terminal of said capacitor being coupled to an output terminal of said level converter circuit, wherein a voltage on said fixed-voltage power supply line is lower than a voltage on said high-voltage power supply line.