Patent ID: 8422622
Filing Date: 2013-04-16
Classification: G09G,G11C

Abstract:
1. A shift register comprising: one or more cascade connection circuits in each of which stages are cascade-connected to one another for transmission of a shift pulse, at least one of said one or more cascade connection circuits including, among all the stages thereof, a successive stage group constituted by successive stages, each stage of the successive stage group including: a first output transistor having (i) a drain to which a first direct current voltage is applied and (ii) a source serving as a first output terminal which is an output terminal of said each stage; a second output transistor having (i) a drain which is supplied with a first clock signal which corresponds to said each stage and which has an active clock pulse during a period that does not overlap a pulse period of a shift pulse for said each stage and (ii) a source serving as a second output terminal which is an output terminal of said each stage and which is different from the first output terminal; a first capacitor having a first end connected to a gate of the first output transistor and to a gate of the second output transistor; an input gate which is supplied with the shift pulse for said each stage and which passes the first direct current voltage to be supplied to the first end of the first capacitor during the pulse period of the shift pulse for said each stage; a first switching element having (i) a first end connected to a second end of the first capacitor, (ii) a second end to which the first direct current voltage is applied, and (iii) a conduction-and-shutoff control terminal which is supplied with the first clock signal; a second switching element having (i) a first end connected to the second end of the first capacitor, (ii) a second end to which a second direct current voltage lower than the first direct current voltage is applied, and (iii) a conduction-and-shutoff control terminal which is supplied with the shift pulse for said each stage; a third switching element having (i) a first end connected to the first end of the first capacitor, (ii) a second end to which the second direct current voltage is applied, and (iii) a conduction-and-shutoff control terminal which is supplied with a pulse signal that is delayed in phase from a shift pulse outputted from the second output terminal of said each stage; a fourth switching element having (i) a first end connected to the first output terminal, (ii) a second end to which the second direct current voltage is applied, and (iii) a conduction-and-shutoff control terminal which is supplied with (A) in a case where said each stage is not a final stage of the successive stage group, a shift pulse outputted from the second output terminal of a next stage and (B) in a case where said each stage is the final stage of the successive stage group, a pulse signal that is delayed in phase from a shift pulse outputted from the second output terminal of the final stage; and a sixth switching element having (i) a first end connected to the second output terminal, (ii) a second end to which the second direct current voltage is applied, and (iii) a conduction-and-shutoff control terminal connected to the conduction-and-shutoff control terminal of the fourth switching element, at least each stage other than the final stage in the successive stage group including a fifth switching element having (i) a first end connected to the conduction-and-shutoff control terminal of the fourth switching element, (ii) a second end to which the second direct current voltage is applied, and (iii) a conduction-and-shutoff control terminal which is supplied with the shift pulse for said each stage.