Semiconductor device including oxide semiconductor layer
First Claim
1. A semiconductor device comprising:
- a first transistor including a first oxide semiconductor layer; and
a second transistor including a second oxide semiconductor layer,wherein the second transistor includes a first gate electrode below the second oxide semiconductor layer and a second gate electrode above the second oxide semiconductor layer,wherein the second oxide semiconductor layer includes a first region and a second region,wherein the second region overlaps with a source or a drain electrode of the second transistor,wherein a thickness of the first region is smaller than a thickness of the second region, andwherein the first transistor is electrically connected to a pixel electrode, and the pixel electrode is formed using the same material as the second gate electrode.
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Accused Products
Abstract
As a display device has a higher definition, the number of pixels, gate lines, and signal lines are increased. When the number of the gate lines and the signal lines are increased, a problem of higher manufacturing cost, because it is difficult to mount an IC chip including a driver circuit for driving of the gate and signal lines by bonding or the like. A pixel portion and a driver circuit for driving the pixel portion are provided over the same substrate, and at least part of the driver circuit includes a thin film transistor using an oxide semiconductor interposed between gate electrodes provided above and below the oxide semiconductor. Therefore, when the pixel portion and the driver portion are provided over the same substrate, manufacturing cost can be reduced.
271 Citations
10 Claims
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1. A semiconductor device comprising:
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a first transistor including a first oxide semiconductor layer; and a second transistor including a second oxide semiconductor layer, wherein the second transistor includes a first gate electrode below the second oxide semiconductor layer and a second gate electrode above the second oxide semiconductor layer, wherein the second oxide semiconductor layer includes a first region and a second region, wherein the second region overlaps with a source or a drain electrode of the second transistor, wherein a thickness of the first region is smaller than a thickness of the second region, and wherein the first transistor is electrically connected to a pixel electrode, and the pixel electrode is formed using the same material as the second gate electrode. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor device comprising:
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a first transistor including a first oxide semiconductor layer; and a second transistor including a second oxide semiconductor layer, wherein the second transistor includes a first gate electrode below the second oxide semiconductor layer and a second gate electrode above the second oxide semiconductor layer, wherein the second oxide semiconductor layer includes a first region and a second region, wherein the second region overlaps with a source or a drain electrode of the second transistor, wherein a thickness of the first region is smaller than a thickness of the second region, and wherein the first transistor is electrically connected to a pixel electrode, and the pixel electrode is formed using a different material from the second gate electrode. - View Dependent Claims (7, 8, 9, 10)
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Specification