Display device
First Claim
1. A semiconductor device comprising:
- a pixel portion over a substrate;
a protective circuit over the substrate, wherein the protective circuit is placed on an outside of the pixel portion;
a scan line electrically connected to the protective circuit; and
a common wiring electrically connected to the protective circuit,wherein the protective circuit comprises a first transistor and a second transistor,wherein one of a source and a drain of the first transistor is electrically connected to the scan line, a gate of the first transistor, and one of a source and a drain of the second transistor,wherein the other of the source and the drain of the first transistor is electrically connected to the common wiring, a gate of the second transistor, and the other of the source and the drain of the second transistor,wherein each of the first transistor and the second transistor comprises an oxide semiconductor layer comprising a channel region, andwherein the oxide semiconductor layer comprises indium, gallium, and zinc.
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Accused Products
Abstract
A display device including an oxide semiconductor, a protective circuit and the like having appropriate structures and a small occupied area is necessary. The protective circuit is formed using a non-linear element which includes a gate insulating film covering a gate electrode; a first oxide semiconductor layer which is over the gate insulating layer and overlaps with the gate electrode; and a first wiring layer and a second wiring layer each of which is formed by stacking a conductive layer and a second oxide semiconductor layer and whose end portions are over the first oxide semiconductor layer and overlap with the gate electrode. The gate electrode of the non-linear element is connected to a scan line or a signal line, the first wiring layer or the second wiring layer of the non-linear element is directly connected to the gate electrode layer so as to apply potential of the gate electrode.
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Citations
26 Claims
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1. A semiconductor device comprising:
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a pixel portion over a substrate; a protective circuit over the substrate, wherein the protective circuit is placed on an outside of the pixel portion; a scan line electrically connected to the protective circuit; and a common wiring electrically connected to the protective circuit, wherein the protective circuit comprises a first transistor and a second transistor, wherein one of a source and a drain of the first transistor is electrically connected to the scan line, a gate of the first transistor, and one of a source and a drain of the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to the common wiring, a gate of the second transistor, and the other of the source and the drain of the second transistor, wherein each of the first transistor and the second transistor comprises an oxide semiconductor layer comprising a channel region, and wherein the oxide semiconductor layer comprises indium, gallium, and zinc. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor device comprising:
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a pixel portion over a substrate; a protective circuit over the substrate, wherein the protective circuit is placed on an outside of the pixel portion; a scan line electrically connected to the protective circuit; and a common wiring electrically connected to the protective circuit, wherein the protective circuit comprises a first transistor, a second transistor, and a third transistor, wherein one of a source and a drain of the first transistor is electrically connected to the scan line and a gate of the first transistor, wherein one of a source and a drain of the second transistor is electrically connected to the common wiring and a gate of the second transistor, wherein one of a source and a drain of the third transistor is electrically connected to the scan line, wherein the other of the source and the drain of the third transistor is electrically connected to the common wiring, wherein a gate of the third transistor is electrically connected to the other of the source and the drain of the first transistor and the other of the source and the drain of the second transistor, wherein each of the first transistor, the second transistor, and the third transistor comprises an oxide semiconductor layer comprising a channel region, and wherein the oxide semiconductor layer comprises indium, gallium, and zinc. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A semiconductor device comprising:
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a pixel portion over a substrate; a protective circuit over the substrate, wherein the protective circuit is placed on an outside of the pixel portion; a scan line electrically connected to the protective circuit; and a common wiring electrically connected to the protective circuit, wherein the protective circuit comprises a first transistor, a second transistor, a third transistor, and a fourth transistor, wherein one of a source and a drain of the first transistor is electrically connected to the common wiring, a gate of the second transistor, and one of a source and a drain of the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to the scan line, a gate of the first transistor, and the other of the source and the drain of the second transistor, wherein one of a source and a drain of the third transistor is electrically connected to the common wiring, a gate of the fourth transistor, and one of a source and a drain of the fourth transistor, wherein the other of the source and the drain of the third transistor is electrically connected to the scan line, a gate of the third transistor, and the other of the source and the drain of the fourth transistor, wherein each of the first transistor, the second transistor, the third transistor, and the fourth transistor comprises an oxide semiconductor layer comprising a channel region, and wherein the oxide semiconductor layer comprises indium, gallium, and zinc. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A semiconductor device comprising:
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a pixel portion over a substrate; a protective circuit over the substrate, wherein the protective circuit is placed on an outside of the pixel portion; a scan line electrically connected to the protective circuit; and a common wiring electrically connected to the protective circuit, wherein the protective circuit comprises a first transistor and a second transistor, wherein one of a source and a drain of the first transistor is electrically connected to the scan line, a gate of the first transistor, and one of a source and a drain of the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to the common wiring, a gate of the second transistor, and the other of the source and the drain of the second transistor, wherein each of the first transistor and the second transistor comprises a first oxide semiconductor layer and a second oxide semiconductor layer, wherein the second oxide semiconductor layer has higher electrical conductivity than the first oxide semiconductor layer, and wherein each of the first oxide semiconductor layer and the second oxide semiconductor layer comprises indium, gallium, and zinc. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification