Liquid crystal display device
First Claim
Patent Images
1. A liquid crystal display device comprising:
- a thin film transistor comprising;
a gate electrode;
a semiconductor layer comprising polycrystalline silicon;
a gate insulating layer separating the gate electrode and the semiconductor layer;
a first insulating layer over the thin film transistor;
a first conductive layer over the first insulating layer and in direct contact with the semiconductor layer through an opening in the first insulating layer;
a second insulating layer over the first conductive layer;
a common electrode over the second insulating layer;
a third insulating layer over the common electrode; and
a pixel electrode over the third insulating layer,wherein the pixel electrode is in electrical contact with the first conductive layer through an opening in the third insulating layer and a first opening in the second insulating layer;
wherein the common electrode is in electrical contact with a second conductive layer made from a same film as the first conductive layer through a second opening in the second insulating layer;
wherein the second conductive layer is in electrical contact with a third conductive layer made of the same film as the gate electrode through an opening in the first insulating layer; and
wherein the common electrode substantially overlaps with the pixel electrode in an optically active region of a pixel;
wherein the opening in the third insulating layer and the first opening in the second insulating layer overlap each other at least partially;
wherein the opening in the first insulating layer and the second opening in the second insulating layer do not overlap each other.
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Abstract
It is an object of the present invention to provide a liquid crystal display device which has a wide viewing angle and less color-shift depending on an angle at which a display screen is seen and can display an image favorably recognized both outdoors in sunlight and dark indoors (or outdoors at night). The liquid crystal display device includes a first portion where display is performed by transmission of light and a second portion where display is performed by reflection of light. Further, a liquid crystal layer includes a liquid crystal molecule which rotates parallel to an electrode plane when a potential difference is generated between two electrodes of a liquid crystal element provided below the liquid crystal layer.
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Citations
65 Claims
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1. A liquid crystal display device comprising:
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a thin film transistor comprising; a gate electrode; a semiconductor layer comprising polycrystalline silicon; a gate insulating layer separating the gate electrode and the semiconductor layer; a first insulating layer over the thin film transistor; a first conductive layer over the first insulating layer and in direct contact with the semiconductor layer through an opening in the first insulating layer; a second insulating layer over the first conductive layer; a common electrode over the second insulating layer; a third insulating layer over the common electrode; and a pixel electrode over the third insulating layer, wherein the pixel electrode is in electrical contact with the first conductive layer through an opening in the third insulating layer and a first opening in the second insulating layer; wherein the common electrode is in electrical contact with a second conductive layer made from a same film as the first conductive layer through a second opening in the second insulating layer; wherein the second conductive layer is in electrical contact with a third conductive layer made of the same film as the gate electrode through an opening in the first insulating layer; and wherein the common electrode substantially overlaps with the pixel electrode in an optically active region of a pixel; wherein the opening in the third insulating layer and the first opening in the second insulating layer overlap each other at least partially; wherein the opening in the first insulating layer and the second opening in the second insulating layer do not overlap each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A liquid crystal display device comprising:
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a thin film transistor comprising; a gate electrode; a semiconductor layer comprising polycrystalline silicon; a gate insulating layer separating the gate electrode and the semiconductor layer; a first insulating layer over the thin film transistor; a first conductive layer over the first insulating layer and in direct contact with the semiconductor layer through an opening in the first insulating layer; a second insulating layer including an organic material over the first conductive layer; a common electrode over the second insulating layer; a third insulating layer containing nitride over the common electrode; and a pixel electrode over the third insulating layer, wherein the pixel electrode is in electrical contact with the first conductive layer through an opening in the third insulating layer and a first opening in the second insulating layer; wherein the common electrode is in electrical contact with a second conductive layer made from a same film as the first conductive layer through a second opening in the second insulating layer; wherein the second conductive layer is in electrical contact with a third conductive layer made of the same film as the gate electrode through an opening in the first insulating layer; and wherein the common electrode substantially overlaps with the pixel electrode in an optically active region of a pixel; wherein the opening in the third insulating layer and the first opening in the second insulating layer overlap each other at least partially; wherein the opening in the first insulating layer and the second opening in the second insulating layer do not overlap each other. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A liquid crystal display device comprising:
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a thin film transistor comprising; a gate electrode; a semiconductor layer comprising polycrystalline silicon; a gate insulating layer separating the gate electrode and the semiconductor layer; a first insulating layer comprising nitride over the thin film transistor; a first conductive layer over the first insulating layer and in direct contact with the semiconductor layer through an opening in the first insulating layer; a second insulating layer over the first conductive layer; a common electrode over the second insulating layer; a third insulating layer over the common electrode; and a pixel electrode over the third insulating layer, wherein the pixel electrode is in electrical contact with the first conductive layer through an opening in the third insulating layer and a first opening in the second insulating layer; wherein the common electrode is in electrical contact with a second conductive layer made from a same film as the first conductive layer through a second opening in the second insulating layer; wherein the second conductive layer is in electrical contact with a third conductive layer made of the same film as the gate electrode through an opening in the first insulating layer; and wherein the common electrode substantially overlaps with the pixel electrode in an optically active region of a pixel; wherein the opening in the third insulating layer and the first opening in the second insulating layer overlap each other at least partially; wherein the opening in the first insulating layer and the second opening in the second insulating layer do not overlap each other. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A liquid crystal display device comprising:
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a thin film transistor comprising; a gate electrode; a semiconductor layer comprising polycrystalline silicon; a gate insulating layer separating the gate electrode and the semiconductor layer; a first insulating layer over the thin film transistor; a first conductive layer over the first insulating layer and in direct contact with the semiconductor layer through an opening in the first insulating layer; a second insulating layer over the first conductive layer; a common electrode over the second insulating layer; a third insulating layer over the common electrode; and a pixel electrode comprising indium tin oxide over the third insulating layer, wherein the pixel electrode is in electrical contact with the first conductive layer through an opening in the third insulating layer and a first opening in the second insulating layer; wherein the common electrode is in electrical contact with a second conductive layer made from a same film as the first conductive layer through a second opening in the second insulating layer; wherein the second conductive layer is in electrical contact with a third conductive layer made of the same film as the gate electrode through an opening in the first insulating layer; and wherein the common electrode substantially overlaps with the pixel electrode in an optically active region of a pixel; wherein the opening in the third insulating layer and the first opening in the second insulating layer overlap each other at least partially; wherein the opening in the first insulating layer and the second opening in the second insulating layer do not overlap each other. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsKimura, Hajime, Uochi, Hideki
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Primary Examiner(s)Wong, Tina
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Application NumberUS13/195,956Publication NumberTime in Patent Office742 DaysField of SearchNoneUS Class Current349/114CPC Class CodesG02F 1/133345 Insulating layers G02F1/133...G02F 1/133371 Cells with varying thicknes...G02F 1/133553 Reflecting elements associa...G02F 1/133555 TransflectorsG02F 1/134309 characterised by their geom...G02F 1/134363 for applying an electric fi...G02F 1/134372 for fringe field switching ...G02F 1/134381 Hybrid switching mode, i.e....G02F 1/136227 Through-hole connection of ...G02F 1/136286 Wiring, e.g. gate line, dra...G02F 1/1368 in which the switching elem...G02F 2201/121 common or backgroundG02F 2201/123 pixelG02F 2203/01 transmissiveH01L 27/12 the substrate being other t...
