Semiconductor device and display device

Abstract

A circuit which is constituted by a plurality of n-channel transistors includes, in at least one embodiment, a transistor (T 1 ) which has a drain terminal to which an input signal is supplied and a source terminal from which a output signal is supplied; and a transistor (T 2 ) which has a drain terminal to which a control signal is supplied and a source terminal connected to a gate terminal of the transistor (T 1 ). A gate terminal of the transistor (T 2 ) is connected to the source terminal of the transistor (T 2 ). With the arrangement, it is possible to provide (i) a semiconductor device which is constituted by transistors having an identical conductivity type and which is capable of reducing an influence of noise, and (ii) a display device including the semiconductor device.

1 . (canceled) 
     
     
         2 . (canceled) 
     
     
         3 . A semiconductor device which is constituted by a plurality of transistors having an identical conductivity type, comprising;
 a first transistor which has a first terminal to which an input signal is supplied and a second terminal from which an output signal is outputted;   a second transistor which has a first terminal to which a control signal is supplied and a second terminal which is connected to a control terminal of the first transistor;   a control terminal of the second transistor being connected to the first terminal of the second transistor; and,   a third transistor which has (i) a first terminal connected to a point at which the control terminal of the first transistor and the second terminal of the second transistor are connected to each other, (ii) a second terminal to which an OFF voltage is supplied, and (iii) a control terminal to which an inversion signal of the control signal is supplied.   
     
     
         4 . (canceled) 
     
     
         5 . A semiconductor device which is constituted by a plurality of transistors having an identical conductivity type, comprising:
 a first transistor which has a first terminal to which an input signal is supplied and a second terminal from which an output signal is outputted;   a second transistor which has a first terminal to which a control signal is supplied and a second terminal which is connected to a control terminal of the first transistor;   a fourth transistor which has a first terminal connected to a point at which the control terminal of the first transistor and the second terminal of the second transistor are connected to each other, and a control terminal to which an ON voltage is supplied; and   a third transistor which has a first terminal connected to a second terminal of the fourth transistor, a second terminal to which an OFF voltage is supplied, and a control terminal to which an inversion signal of the control signal is supplied,   a control terminal of the second transistor and the first terminal of the second transistor being connected to each other.   
     
     
         6 . A semiconductor device according to  claim 3 , further comprising a fifth transistor which has a first terminal to which the control signal is supplied, a control terminal to which an inversion signal of the control signal is supplied, and a second terminal connected to the second terminal of the first transistor. 
     
     
         7 . A semiconductor device according to  claim 3 , further comprising a fifth transistor which has a first terminal to which an OFF voltage is supplied, a control terminal to which an inversion signal of the control signal is supplied, and a second terminal connected to the second terminal of the first transistor. 
     
     
         8 . A semiconductor device which is constituted by a plurality of transistors having an identical conductivity type, comprising:
 a first circuit to which a first input signal is supplied; and   a second circuit to which a second input signal is supplied,   the semiconductor device outputting, as an output signal, the first input signal or the second input signal in response to a control signal and an inversion signal of the control signal, the control signal and the inversion signal being supplied to each of the first circuit and the second circuit,   said first circuit including:   a first transistor which has a first terminal to which the first input signal is supplied; and   a second transistor which has a first terminal to which the control signal is supplied and a second terminal connected to a control terminal of the first transistor,   a control terminal of the second transistor and the first terminal of the second transistor being connected to each other,   said second circuit including:   an eleventh transistor which has a first terminal to which the second input signal is supplied; and   a twelfth transistor which has a first terminal to which the inversion signal is supplied and a second terminal connected to a control terminal of the eleventh transistor,   a control terminal of the twelfth transistor and the first terminal of the twelfth transistor being connected to each other,   the output signal being outputted from a point at which a second terminal of the first transistor and a second terminal of the eleventh transistor are connected to each other.   
     
     
         9 . A semiconductor device which is constituted by a plurality of transistors having an identical conductivity type, comprising:
 a first transistor which has a first terminal to which an input signal is supplied and a second terminal from which an output signal is outputted;   a second transistor which has a first terminal to which the input signal is supplied and a second terminal which is connected to a control terminal of the first transistor;   a third transistor which has a first terminal connected to a point at which the control terminal of the first transistor and the second terminal of the second transistor are connected to each other, a second terminal to which the input signal is supplied, and a control terminal to which an inversion signal of the input signal is supplied; and   a sixth transistor which has a first terminal connected to the second terminal of the first transistor, a second terminal to which an OFF voltage is supplied, and a control terminal to which an inversion signal of the control signal is supplied,   a control terminal of the second transistor and the first terminal of the second transistor being connected to each other.   
     
     
         10 . A display device comprising a semiconductor device recited in  claim 3 .