Semiconductor device comprising a pixel portion and a driver circuit
First Claim
1. A semiconductor device comprising:
- a pixel portion comprising a first transistor, and a driver circuit comprising a second transistor over a substrate,wherein each of the first transistor and the second transistor comprises;
a gate electrode layer;
a gate insulating layer adjacent to the gate electrode layer;
an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer comprising a first region and a second region;
an oxide insulating layer in contact with the oxide semiconductor layer; and
a conductive layer over the oxide insulating layer, the conductive layer at least overlapping with the gate electrode layer,wherein the oxide semiconductor layer is located between the gate insulating layer and the oxide insulating layer,wherein the second region includes an edge portion of the oxide semiconductor layer, andwherein a thickness of the second region is smaller than a thickness of the first region.
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Accused Products
Abstract
An object is to improve the aperture ratio of a semiconductor device. The semiconductor device includes a driver circuit portion and a display portion (also referred to as a pixel portion) over the same substrate. The driver circuit includes a channel-etched thin film transistor for driver circuit and a driver circuit wiring formed using metal. Source and drain electrodes of the thin film transistor for the driver circuit are formed using a metal. A channel layer of the thin film transistor for the driver circuit is formed using an oxide semiconductor. The display portion includes a bottom-contact thin film transistor for a pixel and a display portion wiring formed using an oxide conductor. Source and drain electrode layers of the thin film transistor for the pixel are formed using an oxide conductor. A semiconductor layer of the thin film transistor for the pixel is formed using an oxide semiconductor.
213 Citations
14 Claims
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1. A semiconductor device comprising:
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a pixel portion comprising a first transistor, and a driver circuit comprising a second transistor over a substrate, wherein each of the first transistor and the second transistor comprises; a gate electrode layer; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer comprising a first region and a second region; an oxide insulating layer in contact with the oxide semiconductor layer; and a conductive layer over the oxide insulating layer, the conductive layer at least overlapping with the gate electrode layer, wherein the oxide semiconductor layer is located between the gate insulating layer and the oxide insulating layer, wherein the second region includes an edge portion of the oxide semiconductor layer, and wherein a thickness of the second region is smaller than a thickness of the first region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising:
a transistor comprising; a first electrode over a substrate; a gate insulating layer adjacent to the first electrode; a first oxide semiconductor layer adjacent to the first electrode with the gate insulating layer therebetween, the first oxide semiconductor layer comprising a first region and a second region; an oxide insulating layer in contact with the first oxide semiconductor layer; and a light-transmitting conductive layer over the oxide insulating layer, the light-transmitting conductive layer at least overlapping with the first electrode, wherein the first oxide semiconductor layer is located between the gate insulating layer and the oxide insulating layer, wherein the second region includes an edge portion of the first oxide semiconductor layer, and wherein a thickness of the second region is smaller than a thickness of the first region, and a capacitor comprising; a second oxide semiconductor layer over the substrate, wherein the light-transmitting conductive layer overlaps with the second oxide semiconductor layer, and wherein the capacitor has a light-transmitting property. - View Dependent Claims (9, 10, 11, 12, 13, 14)
Specification