Display device
First Claim
1. A display device comprising:
- a pixel portion including a plurality of pixels; and
a driver circuit electrically connected to the pixel portion,wherein the driver circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, and a seventh transistor,wherein a first electrode of the first transistor is electrically connected to a fourth wiring, and a second electrode of the first transistor is electrically connected to a third wiring,wherein a first electrode of the second transistor is electrically connected to a sixth wiring, and a second electrode of the second transistor is electrically connected to the third wiring,wherein a first electrode of the third transistor is electrically connected to a fifth wiring, a second electrode of the third transistor is electrically connected to a gate electrode of the second transistor, and a gate electrode of the third transistor is electrically connected to a seventh wiring,wherein a first electrode of the fourth transistor is electrically connected to the sixth wiring, a second electrode of the fourth transistor is electrically connected to the gate electrode of the second transistor, and a gate electrode of the fourth transistor is electrically connected to a gate electrode of the first transistor,wherein a first electrode of the fifth transistor is electrically connected to the seventh wiring, a second electrode of the fifth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the fifth transistor is electrically connected to a first wiring,wherein a first electrode of the sixth transistor is electrically connected to the sixth wiring, a second electrode of the sixth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the sixth transistor is electrically connected to the gate electrode of the second transistor, andwherein a first electrode of the seventh transistor is electrically connected to the sixth wiring, a second electrode of the seventh transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the seventh transistor is electrically connected to a second wiring.
1 Assignment
0 Petitions
Accused Products
Abstract
By applying an AC pulse to a gate of a transistor which easily deteriorates, a shift in threshold voltage of the transistor is suppressed. However, in a case where amorphous silicon is used for a semiconductor layer of a transistor, the occurrence of a shift in threshold voltage naturally becomes a problem for a transistor which constitutes a part of circuit that generates an AC pulse. A shift in threshold voltage of a transistor which easily deteriorates and a shift in threshold voltage of a turned-on transistor are suppressed by signal input to a gate electrode of the transistor which easily deteriorates through the turned-on transistor. In other words, a structure for applying an AC pulse to a gate electrode of a transistor which easily deteriorates through a transistor to a gate electrode of which a high potential (VDD) is applied, is included.
179 Citations
25 Claims
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1. A display device comprising:
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a pixel portion including a plurality of pixels; and a driver circuit electrically connected to the pixel portion, wherein the driver circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, and a seventh transistor, wherein a first electrode of the first transistor is electrically connected to a fourth wiring, and a second electrode of the first transistor is electrically connected to a third wiring, wherein a first electrode of the second transistor is electrically connected to a sixth wiring, and a second electrode of the second transistor is electrically connected to the third wiring, wherein a first electrode of the third transistor is electrically connected to a fifth wiring, a second electrode of the third transistor is electrically connected to a gate electrode of the second transistor, and a gate electrode of the third transistor is electrically connected to a seventh wiring, wherein a first electrode of the fourth transistor is electrically connected to the sixth wiring, a second electrode of the fourth transistor is electrically connected to the gate electrode of the second transistor, and a gate electrode of the fourth transistor is electrically connected to a gate electrode of the first transistor, wherein a first electrode of the fifth transistor is electrically connected to the seventh wiring, a second electrode of the fifth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the fifth transistor is electrically connected to a first wiring, wherein a first electrode of the sixth transistor is electrically connected to the sixth wiring, a second electrode of the sixth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the sixth transistor is electrically connected to the gate electrode of the second transistor, and wherein a first electrode of the seventh transistor is electrically connected to the sixth wiring, a second electrode of the seventh transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the seventh transistor is electrically connected to a second wiring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A display device comprising:
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a pixel portion including a plurality of pixels; and a first driver circuit and a second driver circuit which are electrically connected to the pixel portion, wherein the first driver circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, and a seventh transistor, wherein a first electrode of the first transistor is electrically connected to a fourth wiring, and a second electrode of the first transistor is electrically connected to a third wiring, wherein a first electrode of the second transistor is electrically connected to a sixth wiring, and a second electrode of the second transistor is electrically connected to the third wiring, wherein a first electrode of the third transistor is electrically connected to a fifth wiring, a second electrode of the third transistor is electrically connected to a gate electrode of the second transistor, and a gate electrode of the third transistor is electrically connected to a seventh wiring, wherein a first electrode of the fourth transistor is electrically connected to the sixth wiring, a second electrode of the fourth transistor is electrically connected to the gate electrode of the second transistor, and a gate electrode of the fourth transistor is electrically connected to a gate electrode of the first transistor, wherein a first electrode of the fifth transistor is electrically connected to the seventh wiring, a second electrode of the fifth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the fifth transistor is electrically connected to a first wiring, wherein a first electrode of the sixth transistor is electrically connected to the sixth wiring, a second electrode of the sixth transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the sixth transistor is electrically connected to the gate electrode of the second transistor, wherein a first electrode of the seventh transistor is electrically connected to the sixth wiring, a second electrode of the seventh transistor is electrically connected to the gate electrode of the first transistor, and a gate electrode of the seventh transistor is electrically connected to a second wiring, wherein the second driver circuit includes an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, a twelfth transistor, a thirteenth transistor, and a fourteenth transistor, wherein a first electrode of the eighth transistor is electrically connected to an eleventh wiring, and a second electrode of the eighth transistor is electrically connected to a tenth wiring, wherein a first electrode of the ninth transistor is electrically connected to a thirteenth wiring, and a second electrode of the ninth transistor is electrically connected to the tenth wiring, wherein a first electrode of the tenth transistor is electrically connected to a twelfth wiring, a second electrode of the tenth transistor is electrically connected to a gate electrode of the ninth transistor, and a gate electrode of the tenth transistor is electrically connected to a fourteenth wiring, wherein a first electrode of the eleventh transistor is electrically connected to the thirteenth wiring, a second electrode of the eleventh transistor is electrically connected to the gate electrode of the ninth transistor, and a gate electrode of the eleventh transistor is electrically connected to a gate electrode of the eighth transistor, wherein a first electrode of the twelfth transistor is electrically connected to the fourteenth wiring, a second electrode of the twelfth transistor is electrically connected to the gate electrode of the eighth transistor, and a gate electrode of the twelfth transistor is electrically connected to an eighth wiring, wherein a first electrode of the thirteenth transistor is electrically connected to the thirteenth wiring, a second electrode of the thirteenth transistor is electrically connected to the gate electrode of the eighth transistor, and a gate electrode of the thirteenth transistor is electrically connected to the gate electrode of the ninth transistor, and wherein a first electrode of the fourteenth transistor is electrically connected to the thirteenth wiring, a second electrode of the fourteenth transistor is electrically connected to the gate electrode of the eighth transistor, and a gate electrode of the fourteenth transistor is electrically connected to a ninth wiring. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A semiconductor device comprising:
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a first transistor; a second transistor; a third transistor; a first clock wiring; a second clock wiring; a first power supply line; a second power supply line; an output node, wherein the first transistor and the second transistor are connected in series between the first clock signal and the first power supply line, wherein a first electrode of the third transistor is connected to a gate electrode of the second transistor, a second electrode of the third transistor is connected to the second clock wiring, and a gate electrode of the third transistor is connected to the second power supply line, and wherein the first transistor and the second transistor are connected to the output node. - View Dependent Claims (24, 25)
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Specification