Liquid crystal display device and electronic appliance
First Claim
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1. A liquid crystal display device comprising:
- at least a first pixel and a second pixel;
the first pixel comprising;
a first field effect transistor over a substrate;
a first conductive film over the substrate;
a first insulating film 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;
a first source wiring over the first insulating film, the first source wiring electrically connected to the first field effect transistor;
a first electrode in contact with the second conductive film;
a second insulating film over the first electrode; and
a second electrode over the second insulating film,the second pixel comprising;
a second field effect transistor over the substrate;
the first conductive film over the substrate;
the first insulating film over the first conductive film;
a third conductive film over the first insulating film, the third conductive film being in contact with the first conductive film;
a second source wiring over the first insulating film, the second source wiring electrically connected to the second field effect transistor;
a third electrode in contact with the third conductive film;
the second insulating film over the third electrode; and
a fourth electrode over the second insulating film,wherein the first pixel and the second pixel are provided along a direction in which the first conductive film extends,wherein the first conductive film and a gate electrode of the first field effect transistor are formed from a same layer,wherein the second conductive film, the first source wiring, the third conductive film, and the second source wiring are formed from a same layer,wherein the first electrode is electrically connected to the first conductive film through the second conductive film,wherein the third electrode is electrically connected to the first conductive film through the third conductive film,wherein the first electrode is electrically connected to the third electrode through the first conductive film, the second conductive film, and the third conductive film,wherein the second electrode overlaps with the first electrode through the second insulating film,wherein the fourth electrode overlaps with the third electrode through the second insulating film, andwherein orientation of liquid crystals is controlled by an electric field between the first electrode and the second electrode, and an electric field between the third electrode and the fourth electrode.
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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.
142 Citations
4 Claims
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1. A liquid crystal display device comprising:
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at least a first pixel and a second pixel; the first pixel comprising; a first field effect transistor over a substrate; a first conductive film over the substrate; a first insulating film 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; a first source wiring over the first insulating film, the first source wiring electrically connected to the first field effect transistor; a first electrode in contact with the second conductive film; a second insulating film over the first electrode; and a second electrode over the second insulating film, the second pixel comprising; a second field effect transistor over the substrate; the first conductive film over the substrate; the first insulating film over the first conductive film; a third conductive film over the first insulating film, the third conductive film being in contact with the first conductive film; a second source wiring over the first insulating film, the second source wiring electrically connected to the second field effect transistor; a third electrode in contact with the third conductive film; the second insulating film over the third electrode; and a fourth electrode over the second insulating film, wherein the first pixel and the second pixel are provided along a direction in which the first conductive film extends, wherein the first conductive film and a gate electrode of the first field effect transistor are formed from a same layer, wherein the second conductive film, the first source wiring, the third conductive film, and the second source wiring are formed from a same layer, wherein the first electrode is electrically connected to the first conductive film through the second conductive film, wherein the third electrode is electrically connected to the first conductive film through the third conductive film, wherein the first electrode is electrically connected to the third electrode through the first conductive film, the second conductive film, and the third conductive film, wherein the second electrode overlaps with the first electrode through the second insulating film, wherein the fourth electrode overlaps with the third electrode through the second insulating film, and wherein orientation of liquid crystals is controlled by an electric field between the first electrode and the second electrode, and an electric field between the third electrode and the fourth electrode. - View Dependent Claims (2)
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3. A liquid crystal display device comprising:
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at least a first pixel and a second pixel; the first pixel comprising; a first field effect transistor over a substrate; a first conductive film over the substrate; a first insulating film 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; a first source wiring over the first insulating film, the first source wiring electrically connected to the first field effect transistor; a first electrode in contact with the second conductive film; a third conductive film over and in contact with the first electrode; a second insulating film over the third conductive film; and a second electrode over the second insulating film, the second pixel comprising; a second field effect transistor over the substrate; the first conductive film over the substrate; the first insulating film over the first conductive film; a fourth conductive film over the first insulating film, the fourth conductive film being in contact with the first conductive film; a second source wiring over the first insulating film, the second source wiring electrically connected to the second field effect transistor; a third electrode in contact with the fourth conductive film; a fifth conductive film over and in contact with the third electrode; the second insulating film over the fifth conductive film; and a fourth electrode over the second insulating film, wherein the first pixel and the second pixel are provided along a direction in which the first conductive film extends, wherein the first conductive film and a gate electrode of the first field effect transistor are formed from a same layer, wherein the second conductive film, the first source wiring, the fourth conductive film, and the second source wiring are formed from a same layer, wherein the first electrode is electrically connected to the first conductive film through the second conductive film, wherein the third electrode is electrically connected to the first conductive film through the fourth conductive film, wherein the first electrode is electrically connected to the third electrode through the first conductive film, the second conductive film, and the fourth conductive film, wherein the first to fourth electrodes each comprise a light-transmitting conductive film, wherein the third to fifth conductive films each comprise a reflective conductive film, wherein the second electrode overlaps with the first electrode through the second insulating film, wherein the fourth electrode overlaps with the third electrode through the second insulating film, and wherein orientation of liquid crystals is controlled by an electric field between the first electrode and the second electrode, and an electric field between the third electrode and the fourth electrode. - View Dependent Claims (4)
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Specification