DISPLAY DEVICE AND METHOD FOR MANUFACTURING THE SAME
First Claim
1. A display device comprising:
- a pixel portion comprising a first thin film transistor including a first oxide semiconductor layer; and
a driver circuit comprising a second thin film transistor including a second oxide semiconductor layer and a third thin film transistor including a third oxide semiconductor layer, the second thin film transistor including a gate electrode below the second oxide semiconductor layer,wherein a wiring is directly connected to the gate electrode of the second thin film transistor, andwherein the third oxide semiconductor layer is directly connected to the wiring.
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Accused Products
Abstract
With an increase in the definition of a display device, the number of pixels is increased, and thus the numbers of gate lines and signal lines are increased. The increase in the numbers of gate lines and signal lines makes it difficult to mount an IC chip having a driver circuit for driving the gate line and the signal line by bonding or the like, which causes an increase in manufacturing costs. A pixel portion and a driver circuit driving the pixel portion are provided over the same substrate. The pixel portion and at least a part of the driver circuit are formed using thin film transistors in each of which an oxide semiconductor is used. Both the pixel portion and the driver circuit are provided over the same substrate, whereby manufacturing costs are reduced.
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Citations
13 Claims
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1. A display device comprising:
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a pixel portion comprising a first thin film transistor including a first oxide semiconductor layer; and a driver circuit comprising a second thin film transistor including a second oxide semiconductor layer and a third thin film transistor including a third oxide semiconductor layer, the second thin film transistor including a gate electrode below the second oxide semiconductor layer, wherein a wiring is directly connected to the gate electrode of the second thin film transistor, and wherein the third oxide semiconductor layer is directly connected to the wiring. - View Dependent Claims (2, 3, 4)
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5. A display device comprising:
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a pixel portion over a substrate, the pixel portion comprising; a first thin film transistor including a first gate electrode and a first oxide semiconductor layer over the first gate electrode with a gate insulating layer between the first gate electrode and the first oxide semiconductor layer; and a driver circuit over the substrate, the driver circuit comprising; a wiring over the gate insulating layer; and a second thin film transistor including a second gate electrode and a second oxide semiconductor layer over the second gate electrode with the gate insulating layer between the second gate electrode and the second oxide semiconductor layer, wherein the second oxide semiconductor layer overlaps the wiring, wherein the wiring is in contact with the second oxide semiconductor layer and the second gate electrode. - View Dependent Claims (6, 7)
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8. A display device comprising:
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a pixel portion over a substrate, the pixel portion comprising; a first thin film transistor including a first gate electrode and a first oxide semiconductor layer over the first gate electrode with a gate insulating layer between the first gate electrode and the first oxide semiconductor layer; and a driver circuit over the substrate, the driver circuit comprising; a wiring over the gate insulating layer; a second thin film transistor including a second gate electrode and a second oxide semiconductor layer over the second gate electrode with the gate insulating layer between the second gate electrode and the second oxide semiconductor layer, wherein the second oxide semiconductor layer overlaps the wiring; and a third thin film transistor including a third gate electrode and a third oxide semiconductor layer over the third gate electrode with the gate insulating layer between the third gate electrode and the third oxide semiconductor layer, wherein the third oxide semiconductor layer overlaps the wiring, wherein the wiring is in contact with the second oxide semiconductor layer, the third oxide semiconductor layer, and the third gate electrode. - View Dependent Claims (9, 10)
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11. A method for manufacturing a display device, comprising the steps of:
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forming a first gate electrode and a second gate electrode over a substrate; forming a gate insulating layer over the first gate electrode and the second gate electrode; forming a contact hole in the gate insulating layer; forming a first wiring directly connected to the second gate electrode through the contact hole and a second wiring overlapping with both the first gate electrode and the second gate electrode with the first gate insulating layer interposed therebetween; and forming a first oxide semiconductor layer overlapping with the first gate electrode over the gate insulating layer and the second wiring and a second oxide semiconductor layer overlapping with the first gate electrode over the gate insulating layer, the first wiring and the second wiring, wherein the second oxide semiconductor layer is in direct contact with the first wiring and the second wiring. - View Dependent Claims (12, 13)
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Specification