Patent ID: 8384702

Claim:
A semiconductor device, comprising a plurality of thin film transistors of a single channel formed on an insulating substrate, and a buffer circuit including: an outputting stage formed from a series connection of first and second thin film transistors and having an output terminal at a node between said first and second thin film transistors; a first inputting stage formed from a series connection of a third thin film transistor for being controlled with a set pulse and a fourth thin film transistor for being controlled with a reset pulse and configured to switchably control a potential state of a first controlling wiring line connected to a control electrode of said first thin film transistor between a potential state within a period from an application starting timing of the set pulse to an application starting timing of the reset pulse and another potential state within any other period through a potential appearing at a node between said third and fourth thin film transistors; a second inputting stage formed from a series connection of a fifth thin film transistor for being controlled with the reset pulse and a sixth thin film transistor for being controlled with the set pulse and configured to switchably control a potential state of a second controlling wiring line connected to a control electrode of said second thin film transistor in a phase relationship reverse to that of a potential variation of said first controlling wiring line through a potential appearing at a node between said fifth and sixth thin film transistors; a seventh thin film transistor connected at one of main electrodes thereof to said first controlling wiring line and at the other main electrode thereof to a power supply common to said second, fourth and sixth thin film transistors and further connected at a control electrode thereof to said second controlling wiring line; and an eighth thin film transistor connected at one of main electrodes thereof to said second controlling wiring line and at the other main electrode thereof to the power supply common to said second, fourth and sixth thin film transistors and further connected at a control electrode thereof to said first controlling wiring line.