Display device
First Claim
Patent Images
1. A display device comprising:
- a substrate;
a pixel portion including a single-gate transistor, the single-gate transistor comprising;
a first gate electrode over the substrate;
a gate insulating layer over the first gate electrode;
a first semiconductor layer over the gate insulating layer, the first semiconductor layer comprising;
a first microcrystalline semiconductor region over the gate insulating layer; and
a first amorphous semiconductor region over the first microcrystalline semiconductor region,a pair of first wirings over the first amorphous semiconductor region; and
an insulating layer over the pair of first wirings and the first amorphous semiconductor region,a driver circuit including a dual-gate transistor, the dual-gate transistor comprising;
a second gate electrode over the substrate;
the gate insulating layer over the second gate electrode;
a second semiconductor layer over the gate insulating layer, the second semiconductor layer comprising;
a second microcrystalline semiconductor region over the gate insulating layer; and
a pair of second amorphous semiconductor regions over the second microcrystalline semiconductor region,a pair of second wirings over the pair of second amorphous semiconductor regions;
the insulating layer over the pair of second wirings and the second microcrystalline semiconductor region; and
a back gate electrode over the insulating layer,wherein the insulating layer in the pixel portion is over and in contact with the first amorphous semiconductor region in a first region that overlaps with a region between the pair of the first wirings,wherein the insulating layer in the pixel portion is not in contact with the first microcrystalline semiconductor region in the first region, andwherein the insulating layer in the driver circuit is over and in contact with the first amorphous semiconductor region and the second microcrystalline semiconductor region in a second region that overlaps with a region between the pair of the second wirings.
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Abstract
An object is to provide a display device whose frame can be narrowed and whose display characteristics are excellent. The display device includes a driver circuit and a pixel portion. The driver circuit and the pixel portion are formed using a dual-gate thin film transistor and a single-gate thin film transistor, respectively. In the dual-gate thin film transistor in the display device, a semiconductor layer is formed using a microcrystalline semiconductor region and a pair of amorphous semiconductor regions, and a gate insulating layer and an insulating layer are in contact with the microcrystalline semiconductor region of the semiconductor layer.
51 Citations
18 Claims
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1. A display device comprising:
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a substrate; a pixel portion including a single-gate transistor, the single-gate transistor comprising; a first gate electrode over the substrate; a gate insulating layer over the first gate electrode; a first semiconductor layer over the gate insulating layer, the first semiconductor layer comprising; a first microcrystalline semiconductor region over the gate insulating layer; and a first amorphous semiconductor region over the first microcrystalline semiconductor region, a pair of first wirings over the first amorphous semiconductor region; and an insulating layer over the pair of first wirings and the first amorphous semiconductor region, a driver circuit including a dual-gate transistor, the dual-gate transistor comprising; a second gate electrode over the substrate; the gate insulating layer over the second gate electrode; a second semiconductor layer over the gate insulating layer, the second semiconductor layer comprising; a second microcrystalline semiconductor region over the gate insulating layer; and a pair of second amorphous semiconductor regions over the second microcrystalline semiconductor region, a pair of second wirings over the pair of second amorphous semiconductor regions; the insulating layer over the pair of second wirings and the second microcrystalline semiconductor region; and a back gate electrode over the insulating layer, wherein the insulating layer in the pixel portion is over and in contact with the first amorphous semiconductor region in a first region that overlaps with a region between the pair of the first wirings, wherein the insulating layer in the pixel portion is not in contact with the first microcrystalline semiconductor region in the first region, and wherein the insulating layer in the driver circuit is over and in contact with the first amorphous semiconductor region and the second microcrystalline semiconductor region in a second region that overlaps with a region between the pair of the second wirings. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device comprising:
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a substrate; a pixel portion including a single-gate transistor, the single-gate transistor comprising; a first gate electrode over the substrate; a gate insulating layer over the first gate electrode; a first semiconductor layer over the gate insulating layer, the first semiconductor layer comprising; a first microcrystalline semiconductor region over the gate insulating layer; and a first amorphous semiconductor region over the first microcrystalline semiconductor region, a pair of first wirings over the first amorphous semiconductor region; and an insulating layer over the pair of first wirings and the first amorphous semiconductor region, a driver circuit including a dual-gate transistor, the dual-gate transistor comprising; a second gate electrode over the substrate; the gate insulating layer over the second gate electrode; a second semiconductor layer over the gate insulating layer, the second semiconductor layer comprising; a second microcrystalline semiconductor region over the gate insulating layer; and a pair of second amorphous semiconductor regions over the second microcrystalline semiconductor region, a pair of second wirings over the pair of second amorphous semiconductor regions; the insulating layer over the pair of second wirings and the second microcrystalline semiconductor region; and a back gate electrode over the insulating layer, wherein the insulating layer in the pixel portion is over and in contact with the first amorphous semiconductor region in a first region that overlaps with a region between the pair of the first wirings, wherein the insulating layer in the pixel portion is not in contact with the first microcrystalline semiconductor region in the first region, wherein the insulating layer in the driver circuit is over and in contact with the first amorphous semiconductor region and the second microcrystalline semiconductor region in a second region that overlaps with a region between the pair of the second wirings, and wherein the first gate electrode is wider than the first microcrystalline semiconductor region and the first amorphous semiconductor region. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A display device comprising:
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a substrate; a pixel portion including a single-gate transistor, the single-gate transistor comprising; a first gate electrode over the substrate; a gate insulating layer over the first gate electrode; a first semiconductor layer over the gate insulating layer, the first semiconductor layer comprising; a first microcrystalline semiconductor region over the gate insulating layer; and a first amorphous semiconductor region over the first microcrystalline semiconductor region, a pair of first wirings over the first amorphous semiconductor region; and an insulating layer over the pair of first wirings and the first amorphous semiconductor region, a driver circuit including a dual-gate transistor, the dual-gate transistor comprising; a second gate electrode over the substrate; the gate insulating layer over the second gate electrode; a second semiconductor layer over the gate insulating layer, the second semiconductor layer comprising; a second microcrystalline semiconductor region over the gate insulating layer; and a pair of second amorphous semiconductor regions over the second microcrystalline semiconductor region, a pair of second wirings over the pair of second amorphous semiconductor regions; the insulating layer over the pair of second wirings and the second microcrystalline semiconductor region; and a back gate electrode over the insulating layer, wherein the insulating layer in the pixel portion is over and in contact with the first amorphous semiconductor region in a first region that overlaps with a region between the pair of the first wirings, wherein the insulating layer in the pixel portion is not in contact with the first microcrystalline semiconductor region in the first region, wherein the insulating layer in the driver circuit is over and in contact with the first amorphous semiconductor region and the second microcrystalline semiconductor region in a second region that overlaps with a region between the pair of the second wirings, and wherein the second gate electrode is electrically connected to the back gate electrode. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification