Display device and electronic device
View Patent ↗It is an object to provide a display device which can favorably display a image without delayed or distorted signals. The display device includes a first gate driver and a second gate driver. The first gate driver and the second gate driver each include a plurality of flip flop circuits and a plurality of transfer signal generation circuits. Both the flip flop circuit and the transfer signal generation circuit are circuits which output a signal inputted to a first input terminal with a half clock cycle delay. In addition, an output terminal of the transfer signal generation circuit is directly connected to a first input terminal of the flip flop circuit in the next stage. Therefore, delay and distortion of the signal which is inputted from the transfer signal generation circuit to the flip flop circuit can be reduced.
1. A display device comprising:
a pixel portion comprising a plurality of gate lines; and
a first gate driver adjacent to the pixel portion, the first gate driver comprising:
a first circuit comprising a first transistor, a second transistor, a third transistor, and a fourth transistor; and
a second circuit comprising a fifth transistor, a sixth transistor, a seventh transistor, and an eighth transistor,
wherein:
one of a source and a drain of the first transistor is directly connected to a first wiring;
the other of the source and the drain of the first transistor is directly connected to a second wiring configured to be supplied with a first clock signal;
one of a source and a drain of the second transistor is directly connected to the first wiring;
the other of the source and the drain of the second transistor is directly connected to a third wiring;
one of a source and a drain of the third transistor is directly connected to a gate of the first transistor;
the other of the source and the drain of the third transistor is directly connected to a fourth wiring;
a gate of the third transistor is directly connected to the fourth wiring;
one of a source and a drain of the fourth transistor is directly connected to the gate of the first transistor;
a gate of the fourth transistor is directly connected to a fifth wiring;
one of a source and a drain of the fifth transistor is directly connected to the fifth wiring;
the other of the source and the drain of the fifth transistor is directly connected to a sixth wiring configured to be supplied with a second clock signal;
one of a source and a drain of the sixth transistor is directly connected to the fifth wiring;
the other of the source and the drain of the sixth transistor is directly connected to the third wiring;
a gate of the sixth transistor is directly connected to a seventh wiring;
one of a source and a drain of the seventh transistor is directly connected to a gate of the fifth transistor;
the other of the source and the drain of the seventh transistor is directly connected to the first wiring;
a gate of the seventh transistor is directly connected to the first wiring;
one of a source and a drain of the eighth transistor is directly connected to the gate of the fifth transistor;
the other of the source and the drain of the eighth transistor is directly connected to the third wiring;
a gate of the eighth transistor is directly connected to the seventh wiring; and
a ratio of a channel width to a channel length of the fourth transistor is larger than a ratio of a channel width to a channel length of the eighth transistor.
2. The display device according to claim 1 , wherein the first circuit is configured to output a signal to at least one of the plurality of gate lines and the second circuit is configured not to output a signal to any of the plurality of gate lines.
3. The display device according to claim 1 ,
wherein the second circuit is configured to output a first stop pulse signal to the gate of the fourth transistor through the fifth wiring, and
wherein the seventh wiring is configured to be supplied with a second stop pulse signal.
4. A display device comprising:
a pixel portion comprising a plurality of gate lines; and
a first gate driver adjacent to the pixel portion, the first gate driver comprising:
a first circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, and a seventh transistor; and
a second circuit comprising a eighth transistor, an ninth transistor, and a tenth transistor,
wherein:
one of a source and a drain of the first transistor is directly connected to a first wiring;
the other of the source and the drain of the first transistor is directly connected to a second wiring configured to be supplied with a first clock signal;
one of a source and a drain of the second transistor is directly connected to the first wiring;
the other of the source and the drain of the second transistor is directly connected to a third wiring;
one of a source and a drain of the third transistor is directly connected to a gate of the first transistor;
the other of the source and the drain of the third transistor is directly connected to a fourth wiring;
a gate of the third transistor is directly connected to the fourth wiring;
one of a source and a drain of the fourth transistor is directly connected to the gate of the first transistor;
the other of the source and the drain of the fourth transistor is directly connected to the third wiring;
one of a source and a drain of the fifth transistor is directly connected to the gate of the first transistor;
a gate of the fifth transistor is directly connected to a fifth wiring;
one of a source and a drain of the sixth transistor is directly connected to a gate of the second transistor and a gate of the fourth transistor;
the other of the source and the drain of the sixth transistor is directly connected to a sixth wiring;
a gate of the sixth transistor is directly connected to the sixth wiring;
one of a source and a drain of the seventh transistor is directly connected to the gate of the second transistor and the gate of the fourth transistor;
the other of the source and the drain of the seventh transistor is directly connected to the third wiring;
a gate of the seventh transistor is directly connected to the gate of the first transistor;
one of a source and a drain of the eighth transistor is directly connected to the fifth wiring;
the other of the source and the drain of the eighth transistor is directly connected to a seventh wiring configured to be supplied with a second clock signal;
one of a source and a drain of the ninth transistor is directly connected to a gate of the eighth transistor;
the other of the source and the drain of the ninth transistor is directly connected to the first wiring;
a gate of the ninth transistor is directly connected to the first wiring;
one of a source and a drain of the tenth transistor is directly connected to the gate of the eighth transistor;
the other of the source and the drain of the tenth transistor is directly connected to the third wiring;
a gate of the tenth transistor is directly connected to an eighth wiring; and
a ratio of a channel width to a channel length of the fifth transistor is larger than a ratio of a channel width to a channel length of the tenth transistor.
5. The display device according to claim 4 , wherein the first circuit is configured to output a signal to at least one of the plurality of gate lines and the second circuit is configured not to output a signal to any of the plurality of gate lines.
6. The display device according to claim 4 ,
wherein the second circuit is configured to output a first stop pulse signal to the gate of the fifth transistor through the fifth wiring, and
wherein the eighth wiring is configured to be supplied with a second stop pulse signal.