Display device and manufacturing method thereof
First Claim
Patent Images
1. A display device comprising:
- a substrate;
a semiconductor layer over the substrate;
a gate electrode;
a gate insulating layer interposed between the gate electrode and the semiconductor layer;
a wiring over the semiconductor layer;
a first insulating layer over the wiring;
a second insulating layer comprising organic material over the first insulating layer;
a third insulating layer over the second insulating layer; and
a pixel electrode over the third insulating layer,wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper,wherein the second layer is over the first layer,wherein the second layer is narrower than the first layer, andwherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer.
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Abstract
It is an object of the present invention to prevent an influence of voltage drop due to wiring resistance, trouble in writing of a signal into a pixel, and trouble in gray scales, and provide a display device with higher definition, represented by an EL display device and a liquid crystal display device. In the present invention, a wiring including Cu is provided as an electrode or a wiring used for the display device represented by the EL display device and the liquid crystal display device. Besides, sputtering is performed with a mask to form the wiring including Cu. With such structure, it is possible to reduce the voltage drop and a deadened signal.
88 Citations
48 Claims
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1. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; a second insulating layer comprising organic material over the first insulating layer; a third insulating layer over the second insulating layer; and a pixel electrode over the third insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second layer is narrower than the first layer, and wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; a second insulating layer comprising organic material over the first insulating layer; a third insulating layer over the second insulating layer; and a pixel electrode over the third insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second layer is narrower than the first layer, wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer, and wherein a portion of a top surface of the first layer is in contact with the first insulating layer. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; a second insulating layer comprising organic material over the first insulating layer; a third insulating layer over the second insulating layer; and a pixel electrode over the third insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second layer is narrower than the first layer, wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer, wherein the gate electrode comprises a third layer comprising titanium and a fourth layer comprising copper, wherein the fourth layer is over the third layer, and wherein the fourth layer is narrower than the third layer. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; a second insulating layer comprising organic material over the first insulating layer; a third insulating layer over the second insulating layer; and a pixel electrode over the third insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second layer is narrower than the first layer, wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer, wherein a portion of a top surface of the first layer is in contact with the first insulating layer, wherein the gate electrode comprises a third layer comprising titanium and a fourth layer comprising copper, wherein the fourth layer is over the third layer, and wherein the fourth layer is narrower than the third layer. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; and a second insulating layer comprising organic material over the first insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second insulating layer comprises a rounded portion in a vertical cross-sectional view of the second insulating layer, wherein the second layer is narrower than the first layer, and wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer. - View Dependent Claims (28, 29, 30, 31)
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32. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; and a second insulating layer comprising organic material over the first insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second insulating layer comprises a rounded portion in a vertical cross-sectional view of the second insulating layer, wherein the second layer is narrower than the first layer, wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer, wherein a portion of a top surface of the first layer is in contact with the first insulating layer. - View Dependent Claims (33, 34, 35, 36)
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37. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; and a second insulating layer comprising organic material over the first insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second insulating layer comprises a rounded portion in a vertical cross-sectional view of the second insulating layer, wherein the second layer is narrower than the first layer, wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer, wherein the gate electrode comprises a third layer comprising titanium and a fourth layer comprising copper, wherein the fourth layer is over the third layer, and wherein the fourth layer is narrower than the third layer. - View Dependent Claims (38, 39, 40, 41, 42)
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43. A display device comprising:
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a substrate; a semiconductor layer over the substrate; a gate electrode; a gate insulating layer interposed between the gate electrode and the semiconductor layer; a wiring over the semiconductor layer; a first insulating layer over the wiring; and a second insulating layer comprising organic material over the first insulating layer, wherein the wiring comprises a first layer comprising titanium and a second layer comprising copper, wherein the second layer is over the first layer, wherein the second insulating layer comprises a rounded portion in a vertical cross-sectional view of the second insulating layer, wherein the second layer is narrower than the first layer, wherein a portion of a bottom surface of the first layer is in contact with the semiconductor layer, wherein a portion of a top surface of the first layer is in contact with the first insulating layer, wherein the gate electrode comprises a third layer comprising titanium and a fourth layer comprising copper, wherein the fourth layer is over the third layer, and wherein the fourth layer is narrower than the third layer. - View Dependent Claims (44, 45, 46, 47, 48)
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Specification