Patent ID: 6686899
Filing Date: 2004-02-03
Classification: G09G,H03K

Abstract:
A display device including a pair of substrates, an electrooptical material layer sandwiched between said pair of substrates, a plurality of pixels formed between said pair of substrates and a driver circuit for driving said plurality of pixels provided on one of said pair of substrates, said driver circuit including a level converter circuit comprised of MISTFTs (Metal Insulator Semiconductor Thin Film Transistors) having semiconductor layers made of polysilicon,said level converter circuit comprising: a pair of a first NMISTFT (N-channel type Metal Insulator Semiconductor Thin Film Transistor) and a first PMISTFT (P-channel type Metal Insulator Semiconductor Thin Film Transistor), each of said first NMISTFT and said first PMISTFT having both a gate terminal thereof and a first terminal thereof coupled to an input terminal for receiving an input pulse via a first capacitance; a pair of a second NMISTFT and a second PMISTFT, each of said second NMISTFT and said second PMISTFT having a second terminal thereof coupled to said input terminal via a second capacitance; a third PMISTFT having a gate terminal thereof coupled to said gate terminals and said first terminals of said first NMISTFT and said first PMISTFT; a third NMISTFT having a gate terminal thereof coupled to said second terminals of said second NMISTFT and said second PMISTFT, a first terminal of said third PMISTFT, a second terminal of said first NMISTFT, and a second terminal of said first PMISTFT being coupled to a high-voltage power supply line, a second terminal of said third NMISTFT, a gate terminal and a first terminal of said second NMISTFT, a gate terminal and a first terminal of said second PMISTFT being coupled to a low-voltage power supply line, and a first junction point between a second terminal of said third PMISTFT and a first terminal of said third NMISTFT being connected to an output terminal of said level converter circuit.