LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPLIANCE
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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.
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Citations
10 Claims
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1. (canceled)
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2. A display device comprising:
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a field effect transistor over a substrate; a first conductive film over the substrate; an insulating film including a contact hole over the first conductive film; a second conductive film over the insulating film, the second conductive film being in contact with the first conductive film through the contact hole; and a third conductive film in contact with the second conductive film. - View Dependent Claims (3, 4)
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5. A display device comprising:
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a field effect transistor over a substrate, the field effect transistor comprising a semiconductor film, a gate electrode, and a gate insulating film between the semiconductor film and the gate electrode; a first conductive film over the substrate; an insulating film including a contact hole over the first conductive film; a second conductive film over the insulating film, the second conductive film being in contact with the first conductive film through the contact hole; and a third conductive film in contact with the second conductive film, wherein the first conductive film is formed from a same layer as the gate electrode. - View Dependent Claims (6, 7)
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8. A display device comprising:
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a field effect transistor over a substrate; a first conductive film over the substrate; a first insulating film including a contact hole over the first conductive film; a second conductive film over the first insulating film, the second conductive film being in contact with the first conductive film through the contact hole; a third conductive film in contact with the second conductive film; a fourth conductive film over and in contact with the third conductive film; a second insulating film over the fourth conductive film; and a pixel electrode over the second insulating film. - View Dependent Claims (9, 10)
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Specification