Shift register for pulse-cut clock signal
View Patent ↗When a voltage level of a pulse-cut first clock signal inputted to a first clock terminal is reversed in the state where a first transistor is turned on and a second transistor is turned off, an anti-reversal circuit including a seventh transistor and an eighth transistor supplies a high voltage VDD to a node n 2 . In this way, a floating state of the node n 2 is avoided, and the voltage level of the node n 2 is prevented from being reversed. Accordingly, the second transistor will not be turned on in the interval, whereby electric potential of an output signal is stably maintained.
1. A drive circuit comprising:
a plurality of shift registers electrically cascaded in a manner whereby an output signal from an output terminal of each of the shift registers is inputted to an input terminal of another one of the shift registers, each of the shift registers including:
an output circuit having a first transistor having a first conductive path between a first clock terminal and an output terminal, and a second transistor having a second conductive path between the output terminal and a voltage electrode,
an input circuit having a third transistor having a third conductive path between an input terminal and a control electrode of the first transistor, and a fourth transistor having a fourth conductive path between the input terminal and a control electrode of the second transistor,
a reset circuit having a fifth transistor having a fifth conductive path between a second clock terminal and the control electrode of the second transistor, and a sixth transistor having a sixth conductive path between the control electrode of the first transistor and the control electrode of the second transistor,
an anti-reversal circuit configured to prevent a voltage level at the control electrode of the second transistor from being reversed when a voltage level of a first clock signal inputted to the first clock terminal is reversed in the state where the first transistor is turned on and the second transistor is turned off, and
a plurality of output lines to output the output signals to the exterior of the shift registers,
wherein a phase-shifted clock signal is inputted to each of the first clock terminals of the shift registers as a first clock signal, and
a second clock signal that is a phase-shifted signal with respect to the first clock signal is inputted to each of the second clock terminals of the shift registers.
2. A drive circuit comprising:
a plurality of shift registers electrically cascaded in a manner whereby an output signal from an output terminal of each of the shift registers is inputted to an input terminal of another one of the shift registers, each of the shift registers including:
an output circuit having a first transistor having a first conductive path between a first clock terminal and an output terminal, and a second transistor having a second conductive path between the output terminal and a voltage electrode,
an input circuit having a third transistor having a third conductive path between an input terminal and a control electrode of the first transistor, and a fourth transistor having a fourth conductive path between the input terminal and a control electrode of the second transistor,
a reset circuit having a fifth transistor having a fifth conductive path between a second clock terminal and the control electrode of the second transistor, and a sixth transistor having a sixth conductive path between the control electrode of the first transistor and the control electrode of the second transistor,
an anti-reversal circuit configured to prevent a voltage level at the control electrode of the second transistor from being reversed when a voltage level of a first clock signal inputted to the first clock terminal is reversed in the state where the first transistor is turned on and the second transistor is turned off, and
a plurality of output lines to output the output signals to the exterior of the shift registers,
wherein a phase-shifted clock signal is inputted to each of the first clock terminals of the shift registers as a first clock signal, and
an output signal of a shift register at a subsequent stage with respect to each of the shift registers is inputted to each of the second clock terminals of each of the shift registers.
3. An electrode substrate comprising:
two drive circuits;
a plurality of pixel transistors provided on intersections of output lines from one of the drive circuits and output lines of the other drive circuit; and
a plurality of pixel electrodes provided on each of the pixel transistors,
wherein at least any one of the two drive circuits is a first drive circuit that includes:
a plurality of shift registers electrically cascaded in a manner whereby an output signal from an output terminal of each of the shift registers is inputted to an input terminal of another one of the shift registers, each of the shift registers having
an output circuit having a first transistor having a first conductive path between a first clock terminal and an output terminal, and a second transistor having a second conductive path between the output terminal and a voltage electrode,
an input circuit having a third transistor having a third conductive path between an input terminal and a control electrode of the first transistor, and a fourth transistor having a fourth conductive path between the input terminal and a control electrode of the second transistor,
a reset circuit having a fifth transistor having a fifth conductive path between a second clock terminal and the control electrode of the second transistor, and a sixth transistor having a sixth conductive path between the control electrode of the first transistor and the control electrode of the second transistor,
an anti-reversal circuit configured to prevent a voltage level at the control electrode of the second transistor from being reversed when a voltage level of a first clock signal inputted to the first clock terminal is reversed in the state where the first transistor is turned on and the second transistor is turned off; and
a plurality of output lines to output the output signals to the exterior of the shift registers,
wherein the first drive circuits is a scan line drive circuit of a display device, and outputs an output signal from each of the shift registers to each of the pixel transistors through each of the output lines.
4. A electrode substrate comprising:
two drive circuits;
a plurality of pixel transistors provided on intersections of output lines from one of the drive circuits and output lines of the other drive circuit; and
a plurality of pixel electrodes provided on each of the pixel transistors,
wherein at least any one of the two drive circuits is a first drive circuit that includes:
a plurality of shift registers electrically cascaded in a manner whereby an output signal from an output terminal of each of the shift registers is inputted to an input terminal of another one of the shift registers, each of the shift registers having
an output circuit having a first transistor haying a first conductive path between a first clock terminal and an output terminal, and a second transistor having a second conductive path between the output terminal and a voltage electrode,
an input circuit having a third transistor having a third conductive path between an input terminal and a control electrode of the first transistor, and a fourth transistor having a fourth conductive path between the input terminal and a control electrode of the second transistor,
a reset circuit having a fifth transistor having a fifth conductive path between a second clock terminal and the control electrode of the second transistor, and a sixth transistor having a sixth conductive path between the control electrode of the first transistor and the control electrode of the second transistor,
an anti-reversal circuit configured to prevent a voltage level at the control electrode of the second transistor from being reversed when a voltage level of a first clock signal inputted to the first clock terminal is reversed in the state where the first transistor is turned on and the second transistor is turned off; and
a plurality of output lines to output the output signals to the exterior of the shift registers,
wherein the first drive circuit is a signal line drive circuit of a display device, and includes a plurality of analog switches provided on the output lines,
the first drive circuit outputs the output signal from each of the shift registers with respect to each of the analog switches, and outputs an image signal to each of the pixel transistors through each of the analog switches.