Unit shift register circuit, shift register circuit, control method for unit shift register circuit, and display device
First Claim
1. A unit shift register circuit constituting each stage of a shift register circuit, the unit shift register circuit comprising:
- a first transistor that includes a first gate terminal, a first source terminal, and a first drain terminal, receives a first clock signal to the first drain terminal, and outputs an output signal from the first source terminal;
a second transistor that includes a second gate terminal, a second source terminal, and a second drain terminal, the second source terminal being connected to the first gate terminal of the first transistor, receives a first input signal to the second drain terminal, and inputs a second input signal to the second gate terminal; and
a third transistor that includes a third gate terminal, a third source terminal, and a third drain terminal, the third source terminal being connected to the first gate terminal of the first transistor, receives a third input signal to the third drain terminal, and inputs a fourth input signal to the third gate terminal,wherein, in a forward shift operation, the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is charged, and the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is discharged, andwherein, in a backward shift operation, the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is charged, and the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is discharged.
1 Assignment
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Accused Products
Abstract
In a forward shift operation, a second input signal having a higher voltage than a voltage of a first input signal is input to a second gate terminal in a case that a first gate terminal of a first transistor is charged, and a fourth input signal having a higher voltage than a voltage of a third input signal is input to a third gate terminal in a case that the first gate terminal of the first transistor is discharged. In a backward shift operation, the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is charged, and the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is discharged.
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Citations
20 Claims
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1. A unit shift register circuit constituting each stage of a shift register circuit, the unit shift register circuit comprising:
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a first transistor that includes a first gate terminal, a first source terminal, and a first drain terminal, receives a first clock signal to the first drain terminal, and outputs an output signal from the first source terminal;
a second transistor that includes a second gate terminal, a second source terminal, and a second drain terminal, the second source terminal being connected to the first gate terminal of the first transistor, receives a first input signal to the second drain terminal, and inputs a second input signal to the second gate terminal; anda third transistor that includes a third gate terminal, a third source terminal, and a third drain terminal, the third source terminal being connected to the first gate terminal of the first transistor, receives a third input signal to the third drain terminal, and inputs a fourth input signal to the third gate terminal, wherein, in a forward shift operation, the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is charged, and the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is discharged, and wherein, in a backward shift operation, the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is charged, and the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is discharged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A control method for a unit shift register circuit that constitutes each stage of a shift register circuit,
wherein the unit shift register circuit includes: -
a first transistor that includes a first gate terminal, a first source terminal, and a first drain terminal, receives a clock signal to the first drain terminal, and outputs an output signal from the first source terminal;
a second transistor that includes a second gate terminal, a second source terminal, and a second drain terminal, the second source terminal being connected to the first gate terminal of the first transistor, receives a first input signal to the second drain terminal, and inputs a second input signal to the second gate terminal; anda third transistor that includes a third gate terminal, a third source terminal, and a third drain terminal, the third source terminal being connected to the first gate terminal of the first transistor, receives a third input signal to the third drain terminal, and inputs a fourth input signal to the third gate terminal, wherein, in a forward shift operation, the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is charged, and the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is discharged, and wherein, in a backward shift operation, the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is charged, and the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is discharged.
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20. A display device comprising:
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a plurality of pixels; a plurality of scanning lines to which the plurality of pixels are connected; and
a plurality of unit shift register circuits respectively constituting stages of a shift register circuit, wherein each of the plurality of unit shift register circuits includes;a first transistor that includes a first gate terminal, a first source terminal, and a first drain terminal, receives a clock signal to the first drain terminal, and outputs an output signal from the first source terminal;
a second transistor that includes a second gate terminal, a second source terminal, and a second drain terminal, the second source terminal being connected to the first gate terminal of the first transistor, receives a first input signal to the second drain terminal, and inputs a second input signal to the second gate terminal; anda third transistor that includes a third gate terminal, a third source terminal, and a third drain terminal, the third source terminal being connected to the first gate terminal of the first transistor, receives a third input signal to the third drain terminal, and inputs a fourth input signal to the third gate terminal, wherein, in a forward shift operation, the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is charged, and the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is discharged, and wherein, in a backward shift operation, the fourth input signal having a higher voltage than a voltage of the third input signal is input to the third gate terminal in a case that the first gate terminal of the first transistor is charged, and the second input signal having a higher voltage than a voltage of the first input signal is input to the second gate terminal in a case that the first gate terminal of the first transistor is discharged.
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Specification