Display device with bidirectional shift register and set-reset flip flops with capacitors that use scanning direction control signals as setting and resetting potentials
First Claim
1. A display device comprising:
- a plurality of pixels; and
a driving circuit for driving the plurality of pixels;
wherein;
the driving circuit includes a single channel bidirectional shift register adapted for bidirectional scanning in a first direction and a second direction;
the single channel bidirectional shift register includes an “
n”
number of basic circuits tandem-connected in multiple stages (wherein “
n”
is equal to or greater than
2);
the basic circuits each include a first circuit and a second circuit;
the first circuit of each basic circuit includes a first transistor having a first electrode connected to a first node, a second electrode connected to a second scanning control line to which a second scanning direction control signal is supplied, and a control electrode connected to a first output terminal of a first basic circuit on a side of a preceding stage in the first scanning direction, and a second transistor having a first electrode connected to the first node, a second electrode connected to a first scanning control line to which a first scanning direction control signal is supplied, and a control electrode connected to a second output terminal of a second basic circuit on a side of a following stage in the first scanning direction;
the second circuit of each basic circuit includes a third transistor having a first electrode connected to a second node, a second electrode connected to the second scanning control line, and a control electrode connected to a third output terminal of a third basic circuit on the side of the following stage in the first scanning direction, and a fourth transistor having a first electrode connected to the second node, a second electrode connected to the first scanning control line, and a control electrode connected to a fourth output terminal of a fourth basic circuit on the side of the preceding stage in the first scanning direction; and
wherein each of the basic circuits further includes;
a fifth transistor having a control electrode connected to the first node, a second electrode connected to the second node, and a first electrode connected to a reference potential line to which a reference potential is supplied;
a sixth transistor having a control electrode connected to the second electrode of the fifth transistor, a first electrode connected to a clock terminal, and a second electrode connected to an output terminal of the basic circuit; and
a first capacitive element connected between the second node and the output terminal of the basic circuit.
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Accused Products
Abstract
The present invention provides a display device that has a driving circuit including a single channel bidirectional shift register with which the circuit scale can be reduced without increasing the number of elements.
The driving circuit includes a single channel bidirectional shift register. This single channel bidirectional shift register has an RS flip-flop circuit. The RS flip-flop circuit includes a first transistor having a first electrode connected to an output terminal and having a second electrode to which a second scanning direction control signal is applied and a second transistor having a first electrode connected to an output terminal and having a second electrode to which a first scanning direction control signal is applied. In this circuit configuration, a resetting signal is applied to a control electrode of the first transistor in a first scanning direction, a setting signal is applied to the control electrode of the first transistor in a second scanning direction which is a direction opposite to the first scanning direction. The setting signal is also applied to a control electrode of the second transistor in the first scanning direction, and the resetting signal is also applied to the control electrode of the second transistor in the second scanning direction.
17 Citations
32 Claims
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1. A display device comprising:
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a plurality of pixels; and a driving circuit for driving the plurality of pixels; wherein; the driving circuit includes a single channel bidirectional shift register adapted for bidirectional scanning in a first direction and a second direction; the single channel bidirectional shift register includes an “
n”
number of basic circuits tandem-connected in multiple stages (wherein “
n”
is equal to or greater than
2);the basic circuits each include a first circuit and a second circuit; the first circuit of each basic circuit includes a first transistor having a first electrode connected to a first node, a second electrode connected to a second scanning control line to which a second scanning direction control signal is supplied, and a control electrode connected to a first output terminal of a first basic circuit on a side of a preceding stage in the first scanning direction, and a second transistor having a first electrode connected to the first node, a second electrode connected to a first scanning control line to which a first scanning direction control signal is supplied, and a control electrode connected to a second output terminal of a second basic circuit on a side of a following stage in the first scanning direction; the second circuit of each basic circuit includes a third transistor having a first electrode connected to a second node, a second electrode connected to the second scanning control line, and a control electrode connected to a third output terminal of a third basic circuit on the side of the following stage in the first scanning direction, and a fourth transistor having a first electrode connected to the second node, a second electrode connected to the first scanning control line, and a control electrode connected to a fourth output terminal of a fourth basic circuit on the side of the preceding stage in the first scanning direction; and wherein each of the basic circuits further includes; a fifth transistor having a control electrode connected to the first node, a second electrode connected to the second node, and a first electrode connected to a reference potential line to which a reference potential is supplied; a sixth transistor having a control electrode connected to the second electrode of the fifth transistor, a first electrode connected to a clock terminal, and a second electrode connected to an output terminal of the basic circuit; and a first capacitive element connected between the second node and the output terminal of the basic circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32)
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29. A display device comprising:
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a plurality of pixels; and a driving circuit for driving the plurality of pixels; wherein; the driving circuit includes a single channel bidirectional shift register adapted for bidirectional scanning in a first direction and a second direction; the single channel bidirectional shift register includes a flip-flop circuit; the flip-flop circuit includes a first transistor having a first electrode connected to a first node and a second electrode to which a second scanning direction control signal is applied, and a second transistor having a first electrode connected to the first node and a second electrode to which a first scanning direction control signal is applied; the first transistor includes a control electrode to which a resetting signal is applied in a first scanning direction and to which a setting signal is applied in a second scanning direction which is a reverse direction to the first scanning direction; the second transistor includes a control electrode to which the setting signal is applied in the first scanning direction and to which the resetting signal is applied in the second scanning direction; each of the transistors is an n-type of transistor; and where the reference potential is defined as an L-level, and an H-level is defined as a voltage level of a potential higher than the reference potential, in the first scanning direction, a voltage level of a first scanning direction control signal is the H-level and a voltage level of a second scanning direction control signal is the L-level, and in the second scanning direction, a voltage level of a first scanning direction control signal is the L-level and a voltage level of a second scanning direction control signal is the H-level.
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30. A display device comprising:
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a plurality of pixels; and a driving circuit for driving the plurality of pixels; wherein; the driving circuit includes a single channel bidirectional shift register adapted for bidirectional scanning in a first direction and a second direction; the single channel bidirectional shift register includes a flip-flop circuit; the flip-flop circuit includes a first transistor having a first electrode connected to a first node and a second electrode to which a second scanning direction control signal is applied, and a second transistor having a first electrode connected to the first node and a second electrode to which a first scanning direction control signal is applied; the first transistor includes a control electrode to which a resetting signal is applied in a first scanning direction and to which a setting signal is applied in a second scanning direction which is a reverse direction to the first scanning direction; the second transistor includes a control electrode to which the setting signal is applied in the first scanning direction and to which the resetting signal is applied in the second scanning direction; each of the transistors is a p-type of transistor; and where the reference potential is defined as an H-level, and an L-level is defined as a voltage level of a potential lower than the reference potential, in the first scanning direction, a voltage level of a first scanning direction control signal is the L-level and a voltage level of a second scanning direction control signal is the H-level, and in the second scanning direction, a voltage level of a first scanning direction control signal is the H-level and a voltage level of a second scanning direction control signal is the L-level.
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Specification