Display device and electronic device including the same
It is an object to decrease the number of transistors connected to a capacitor. In a structure, a capacitor and one transistor are included, one electrode of the capacitor is connected to a wiring, and the other electrode of the capacitor is connected to a gate of the transistor. Since a clock signal is input to the wiring, the clock signal is input to the gate of the transistor through the capacitor. Then, on/off of the transistor is controlled by a signal which synchronizes with the clock signal, so that a period when the transistor is on and a period when the transistor is off are repeated. In this manner, deterioration of the transistor can be suppressed.
1. A semiconductor device comprising:
a first transistor, a second transistor, and a third transistor each including a gate, a first terminal, and a second terminal;
a first conductive layer including the gate of the first transistor;
a second conductive layer including the gate of the second transistor;
a third conductive layer including the gate of the third transistor;
a fourth conductive layer including the first terminal of the first transistor;
a fifth conductive layer including the first terminal of the second transistor, the fifth conductive layer including the first terminal of the third transistor; and
a sixth conductive layer including the second terminal of the first transistor, the sixth conductive layer including the second terminal of the second transistor, and the sixth conductive layer including the second terminal of the third transistor,
wherein the first conductive layer and the sixth conductive layer overlap with each other in a first region,
wherein the first conductive layer and the fourth conductive layer overlap with each other in a second region,
wherein the second conductive layer and the sixth conductive layer overlap with each other in a third region,
wherein the second conductive layer and the fifth conductive layer overlap with each other in a fourth region,
wherein the third conductive layer and the sixth conductive layer overlap with each other in a fifth region,
wherein the third conductive layer and the fifth conductive layer overlap with each other in a sixth region,
wherein area of the first region is larger than area of the second region,
wherein area of the third region is smaller than area of the fourth region, and
wherein area of the fifth region is smaller than area of the sixth region.
2. The semiconductor device according to claim 1 , further comprising:
a fourth transistor, a fifth transistor, a sixth transistor, and seventh transistor each including a gate, a first terminal, and a second terminal,
wherein the gate of the fourth transistor is electrically connected to the first terminal of the first transistor, the first terminal of the fourth transistor is electrically connected to the gate of the first transistor, and the second terminal of the fourth transistor is electrically connected to the second terminal of the first transistor,
wherein the first terminal of the fifth transistor is electrically connected to the gate of the first transistor,
wherein the gate of the sixth transistor is electrically connected to the gate of the first transistor, the first terminal of the sixth transistor is electrically connected to the first terminal of the fifth transistor, and the second terminal of the sixth transistor is electrically connected to the first terminal of the second transistor, and
wherein the gate of the seventh transistor is electrically connected to the gate of the third transistor, the first terminal of the seventh transistor is electrically connected to the gate of the first transistor, and the second terminal of the seventh transistor is electrically connected to the first terminal of the second transistor.
3. The semiconductor device according to claim 1 , further comprising:
a capacitor including a first electrode and a second electrode,
wherein the first electrode is electrically connected to the gate of the first transistor, and
wherein the second electrode is electrically connected to the second terminal of the first transistor.
4. The semiconductor device according to claim 1 , further comprising:
a capacitor including a first electrode and a second electrode, wherein the first electrode is electrically connected to the first terminal of the first transistor.
5. The semiconductor device according to claim 1 , wherein a channel region of one of the first transistor, the second transistor and the third transistor comprises an oxide semiconductor.
6. The semiconductor device according to claim 1 , wherein a channel region of one of the first transistor, the second transistor and the third transistor comprises amorphous silicon.
7. The semiconductor device according to claim 1 , wherein a channel region of one of the first transistor, the second transistor and the third transistor comprises polycrystalline silicon.
8. A display module comprising:
the semiconductor device according to claim 1 ; and
an FPC.
9. An electric apparatus comprising:
the semiconductor device according to claim 1 ; and
at least one of an antenna, a microphone, a speaker, and a sensor.
10. A shift register comprising:
a first transistor, a second transistor, and a third transistor each including a gate, a first terminal, and a second terminal;
a first conductive layer including the gate of the first transistor;
a second conductive layer including the gate of the second transistor;
a third conductive layer including the gate of the third transistor;
a fourth conductive layer including the first terminal of the first transistor;
a fifth conductive layer including the first terminal of the second transistor, the fifth conductive layer including the first terminal of the third transistor; and
a sixth conductive layer including the second terminal of the first transistor, the sixth conductive layer including the second terminal of the second transistor, and the sixth conductive layer including the second terminal of the third transistor,
wherein the first conductive layer and the sixth conductive layer overlap with each other in a first region,
wherein the first conductive layer and the fourth conductive layer overlap with each other in a second region,
wherein the second conductive layer and the sixth conductive layer overlap with each other in a third region,
wherein the second conductive layer and the fifth conductive layer overlap with each other in a fourth region,
wherein the third conductive layer and the sixth conductive layer overlap with each other in a fifth region,
wherein the third conductive layer and the fifth conductive layer overlap with each other in a sixth region,
wherein area of the first region is larger than area of the second region,
wherein area of the third region is smaller than area of the fourth region, and
wherein area of the fifth region is smaller than area of the sixth region.
11. The shift register according to claim 10 , further comprising:
a fourth transistor, a fifth transistor, a sixth transistor, and seventh transistor each including a gate, a first terminal, and a second terminal,
wherein the gate of the fourth transistor is electrically connected to the first terminal of the first transistor, the first terminal of the fourth transistor is electrically connected to the gate of the first transistor, and the second terminal of the fourth transistor is electrically connected to the second terminal of the first transistor,
wherein the first terminal of the fifth transistor is electrically connected to the gate of the first transistor,
wherein the gate of the sixth transistor is electrically connected to the gate of the first transistor, the first terminal of the sixth transistor is electrically connected to the first terminal of the fifth transistor, and the second terminal of the sixth transistor is electrically connected to the first terminal of the second transistor, and
wherein the gate of the seventh transistor is electrically connected to the gate of the third transistor, the first terminal of the seventh transistor is electrically connected to the gate of the first transistor, and the second terminal of the seventh transistor is electrically connected to the first terminal of the second transistor.
12. The shift register according to claim 10 , further comprising:
a capacitor including a first electrode and a second electrode,
wherein the first electrode is electrically connected to the gate of the first transistor, and
wherein the second electrode is electrically connected to the second terminal of the first transistor.
13. The shift register according to claim 10 , further comprising:
a capacitor including a first electrode and a second electrode, wherein the first electrode is electrically connected to the first terminal of the first transistor.
14. The shift register according to claim 10 , wherein a channel region of one of the first transistor, the second transistor and the third transistor comprises an oxide semiconductor.
15. The shift register according to claim 10 , wherein a channel region of one of the first transistor, the second transistor and the third transistor comprises amorphous silicon.
16. The shift register according to claim 10 , wherein a channel region of one of the first transistor, the second transistor and the third transistor comprises polycrystalline silicon.
17. A display module comprising:
the shift register according to claim 10 ; and
an FPC.
18. An electric apparatus comprising:
the shift register according to claim 10 ; and
at least one of an antenna, a microphone, a speaker, and a sensor.