Liquid crystal display device
First Claim
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1. A liquid crystal display device comprising:
- a semiconductor layer;
a gate electrode overlapping with the semiconductor layer;
an electrode electrically connected to the semiconductor layer, wherein the electrode is one of a source electrode and a drain electrode;
a pixel electrode electrically connected to the electrode;
a common wiring;
a conductive layer over and electrically connected to the common wiring;
a common electrode over and electrically connected to the conductive layer; and
a liquid crystal layer over the pixel electrode and the common electrode,wherein the electrode comprises a first material,wherein the conductive layer comprises a second material which is the same as the first material,wherein the pixel electrode comprises a material selected from the group consisting of indium tin oxide, indium zinc oxide, indium tin oxide containing silicon oxide, and zinc oxide, andwherein the common electrode comprises a material selected from the group consisting of indium tin oxide, indium zinc oxide, indium tin oxide containing silicon oxide, and zinc oxide.
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Abstract
It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode.
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Citations
29 Claims
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1. A liquid crystal display device comprising:
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a semiconductor layer; a gate electrode overlapping with the semiconductor layer; an electrode electrically connected to the semiconductor layer, wherein the electrode is one of a source electrode and a drain electrode; a pixel electrode electrically connected to the electrode; a common wiring; a conductive layer over and electrically connected to the common wiring; a common electrode over and electrically connected to the conductive layer; and a liquid crystal layer over the pixel electrode and the common electrode, wherein the electrode comprises a first material, wherein the conductive layer comprises a second material which is the same as the first material, wherein the pixel electrode comprises a material selected from the group consisting of indium tin oxide, indium zinc oxide, indium tin oxide containing silicon oxide, and zinc oxide, and wherein the common electrode comprises a material selected from the group consisting of indium tin oxide, indium zinc oxide, indium tin oxide containing silicon oxide, and zinc oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A liquid crystal display device comprising:
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a semiconductor layer; a gate electrode overlapping with the semiconductor layer; a first insulating layer over the semiconductor layer and the gate electrode; an electrode electrically connected to the semiconductor layer, wherein the electrode is one of a source electrode and a drain electrode and wherein the electrode is located over the first insulating layer; a pixel electrode electrically connected to the electrode; a common wiring, wherein the first insulating layer is located over the common wiring; a conductive layer over and electrically connected to the common wiring, wherein the conductive layer is located over the first insulating layer and a part of the conductive layer is located in a contact hole of the first insulating layer; a common electrode over and electrically connected to the conductive layer; and a liquid crystal layer over the pixel electrode and the common electrode, wherein the electrode comprises a first material, wherein the conductive layer comprises a second material which is the same as the first material, wherein the gate electrode comprises a third material, wherein the common wiring comprises a fourth material which is the same as the third material, wherein the pixel electrode comprises a material selected from the group consisting of indium tin oxide, indium zinc oxide, indium tin oxide containing silicon oxide, and zinc oxide, and wherein the common electrode comprises a material selected from the group consisting of indium tin oxide, indium zinc oxide, indium tin oxide containing silicon oxide, and zinc oxide. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification