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US 11,960,174 B2Granted
Liquid crystal display device and electronic appliance
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
Estimating the term…
Abstract
A pixel electrode or a common electrode is a light-transmissive conductive film; therefore, it is formed of ITO conventionally. Accordingly, the number of manufacturing steps and masks, and manufacturing cost have been increased. An object of the present invention is to provide a semiconductor device, a liquid crystal display device, and an electronic appliance each having a wide viewing angle, less numbers of manufacturing steps and masks, and low manufacturing cost compared with a conventional device. A semiconductor layer of a transistor, a pixel electrode, and a common electrode of a liquid crystal element are formed in the same step.
Claims7
A semiconductor device comprising:
- a transistor comprising a first semiconductor film;
- a first wiring;
- a second wiring functioning as an electrode of a capacitor, the second wiring comprising a metal;
- and
- a third wiring electrically connected to the second wiring,
- wherein the transistor, the capacitor, and a display element are included in a pixel,
- wherein the first semiconductor film comprises indium, gallium, zinc, and oxygen,
- wherein the first wiring and a channel formation region of the transistor overlap each other,
- wherein the second wiring and the first semiconductor film overlap each other,
- wherein, when seen from above, each of the first wiring and the third wiring has a region extending in a first direction,
- wherein, when seen from above, the second wiring has a region extending in a second direction which is different from the first direction,
- wherein, in the first direction, a length of a region where the first semiconductor film and the second wiring overlap each other is larger than a length of a region where the first semiconductor film and the first wiring overlap each other, and
- wherein, when seen from above, the first semiconductor film has a region overlapping with an electrode of the display element.
10 more elements
A semiconductor device comprising:
- a transistor comprising a first semiconductor film;
- a first wiring;
- a second wiring functioning as an electrode of a capacitor, the second wiring comprising a metal;
- and
- a third wiring electrically connected to the second wiring,
- wherein the transistor, the capacitor, and a display element are included in a pixel,
- wherein the first semiconductor film comprises indium, gallium, zinc, and oxygen,
- wherein the first wiring and a channel formation region of the transistor overlap each other,
- wherein the second wiring and the first semiconductor film overlap each other,
- wherein, when seen from above, each of the first wiring and the third wiring has a region extending in a first direction,
- wherein, when seen from above, the second wiring has a region extending in a second direction which is different from the first direction,
- wherein, in the first direction, a length of a region where the first semiconductor film and the second wiring overlap each other is larger than a length of a region where the first semiconductor film and the first wiring overlap each other,
- wherein, when seen from above, the first semiconductor film has a region overlapping with an electrode of the display element,
- wherein the first wiring intersects with the second wiring, and
- wherein the third wiring intersects with the second wiring.
12 more elements
A semiconductor device comprising:
- a transistor comprising a first semiconductor film;
- a first wiring;
- a second wiring functioning as an electrode of a capacitor, the second wiring comprising a metal;
- and
- a third wiring electrically connected to the second wiring,
- wherein the transistor, the capacitor, and a display element are included in a pixel,
- wherein the first semiconductor film comprises indium, gallium, zinc, and oxygen,
- wherein the first wiring and a channel formation region of the transistor overlap each other,
- wherein the second wiring and the first semiconductor film overlap each other,
- wherein, when seen from above, each of the first wiring and the third wiring has a region extending in a first direction,
- wherein, when seen from above, the second wiring has a region extending in a second direction which is different from the first direction,
- wherein, in the first direction, a length of a region where the first semiconductor film and the second wiring overlap each other is larger than a length of a region where the first semiconductor film and the first wiring overlap each other,
- wherein, when seen from above, the first semiconductor film has a region overlapping with an electrode of the display element,
- wherein the first wiring is positioned below the first semiconductor film through a first insulating film,
- wherein the second wiring is positioned over the first semiconductor film through a second insulating film,
- wherein the third wiring is positioned below the second wiring through the first insulating film and the second insulating film, and
- wherein the first insulating film is in contact with a top surface of the first wiring and a top surface of the third wiring.
14 more elements
Dependencies are inferred from the claim text.