Patent ID: 7800576
Filing Date: 2010-09-21
Classification: G09G,G11C

Abstract:
1. A semiconductor device having single-channel thin-film transistors formed on an insulator substrate, the semiconductor device comprising a buffer, the buffer including: a first output stage including a first thin-film transistor and a second thin-film transistor connected in series with the first thin-film transistor, the first output stage having as an output terminal as an intermediate junction point between the first thin-film transistor and the second thin-film transistor; a first input stage including a third thin-film transistor and a fourth thin-film transistor connected in series with the third thin-film transistor with the third thin-film transistor controlled by a set pulse and the fourth thin-film transistor controlled by a reset pulse, the first input stage controlling a voltage status of a first control line connected to a control electrode of the first thin-film transistor in response to a voltage appearing at an intermediate junction point between the third thin-film transistor and the fourth thin-film transistor so that the voltage status of the first control line is switched between a period from an application start timing of the set pulse to an application start timing of the reset pulse and the remaining period; a second input stage including a sixth thin-film transistor and a fifth thin-film transistor connected in series with the sixth thin-film transistor with the six thin-film transistor controlled by the set pulse and the fifth thin-film transistor controlled by the reset pulse, the second input stage controlling a voltage status of a second control line connected to a control electrode of the second thin-film transistor in response to a voltage appearing at an intermediate junction point between the fifth thin-film transistor and the sixth thin-film transistor so that the voltage status of the second control line is switched in reverse phase to the voltage change of the first control line; a seventh thin-film transistor having one main electrode connected to the first control line, the other main electrode connected to a power source commonly shared by the second, fourth, and sixth thin-film transistors, and a control electrode connected to the second control line; an eighth thin-film transistor having one main electrode connected to the second control line, the other main electrode connected to the power source commonly shared by the second, fourth, and sixth thin-film transistors, and a control electrode connected to the first control line; a second output stage including a ninth thin-film transistor and a tenth thin-film transistor connected in series with the ninth thin-film transistor with the ninth thin-film transistor having a control electrode connected to the first control line and the tenth thin-film transistor having a control electrode connected to the second control line, the second output stage supplying a voltage appearing at an intermediate junction point between the ninth thin-film transistor and the tenth thin-film transistor to a third control line; and an eleventh thin-film transistor having one main electrode connected to the first control line, and a control electrode connected to the third control line, the eleventh thin-film transistor supplying to the first control line a voltage at the same logical level as the set pulse for a period throughout which an output pulse appears at the output terminal.