Liquid crystal display device
First Claim
Patent Images
1. A liquid crystal display device comprising:
- a first wiring;
a transistor comprising;
a gate electrode of same structure and composition as the first wiring;
a semiconductor layer comprising polycrystalline silicon overlapping the gate electrode; and
a gate insulating layer interposed between the gate electrode and the semiconductor layer;
a first insulating layer over the transistor and the first wiring;
a second wiring on the first insulating layer, in direct contact with the semiconductor layer through a first opening in the first insulating layer;
a third wiring on the first insulating layer, in direct contact with the first wiring through a second opening in the first insulating layer, the third wiring having a same composition and structure as the second wiring;
a second insulating layer over the first insulating layer, the second wiring, and the third wiring;
a common electrode on the second insulating layer, in electrical contact with the first wiring through the third wiring;
an island-shaped conductive layer having a same composition and structure as a portion of the common electrode;
a third insulating layer over the second insulating layer, the common electrode, and the island-shaped conductive layer; and
a pixel electrode on the third insulating layer, overlapping the common electrode and in electrical contact with the semiconductor layer through the second wiring and the island-shaped conductive layer,wherein an area of contact between the second wiring and the island-shaped conductive layer does not overlap the first wiring, andwherein an area of contact between the pixel electrode and the island-shaped conductive layer does not overlap the first wiring.
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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
21 Claims
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1. A liquid crystal display device comprising:
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a first wiring; a transistor comprising; a gate electrode of same structure and composition as the first wiring; a semiconductor layer comprising polycrystalline silicon overlapping the gate electrode; and a gate insulating layer interposed between the gate electrode and the semiconductor layer; a first insulating layer over the transistor and the first wiring; a second wiring on the first insulating layer, in direct contact with the semiconductor layer through a first opening in the first insulating layer; a third wiring on the first insulating layer, in direct contact with the first wiring through a second opening in the first insulating layer, the third wiring having a same composition and structure as the second wiring; a second insulating layer over the first insulating layer, the second wiring, and the third wiring; a common electrode on the second insulating layer, in electrical contact with the first wiring through the third wiring; an island-shaped conductive layer having a same composition and structure as a portion of the common electrode; a third insulating layer over the second insulating layer, the common electrode, and the island-shaped conductive layer; and a pixel electrode on the third insulating layer, overlapping the common electrode and in electrical contact with the semiconductor layer through the second wiring and the island-shaped conductive layer, wherein an area of contact between the second wiring and the island-shaped conductive layer does not overlap the first wiring, and wherein an area of contact between the pixel electrode and the island-shaped conductive layer does not overlap the first wiring. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A liquid crystal display device comprising:
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a first wiring; a transistor comprising; a gate electrode of same structure and composition as the first wiring; a semiconductor layer comprising polycrystalline silicon overlapping the gate electrode; and a gate insulating layer interposed between the gate electrode and the semiconductor layer; a first insulating layer over the transistor and the first wiring; a second wiring on the first insulating layer, in direct contact with the semiconductor layer through a first opening in the first insulating layer; a third wiring on the first insulating layer, in direct contact with the first wiring through a second opening in the first insulating layer, the third wiring having a same composition and structure as the second wiring; a second insulating layer over the first insulating layer, the second wiring, and the third wiring; a common electrode on the second insulating layer, in electrical contact with the first wiring through the third wiring; an island-shaped conductive layer having a same composition and structure as a portion of the common electrode; a third insulating layer over the second insulating layer, the common electrode, and the island-shaped conductive layer; a pixel electrode on the third insulating layer, overlapping the common electrode and in electrical contact with the semiconductor layer through the second wiring and the island-shaped conductive layer, wherein the common electrode is in electrical contact with the third wiring through an opening in the second insulating layer, wherein the pixel electrode overlaps a portion of the common electrode formed in the opening in the second insulating layer, wherein an area of contact between the second wiring and the island-shaped conductive layer does not overlap the first wiring, and wherein an area of contact between the pixel electrode and the island-shaped conductive layer does not overlap the first wiring. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A liquid crystal display device comprising:
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a first wiring; a transistor comprising; a gate electrode of same structure and composition as the first wiring; a semiconductor layer comprising polycrystalline silicon overlapping the gate electrode; and a gate insulating layer interposed between the gate electrode and the semiconductor layer; a first insulating layer over the transistor and the first wiring; a second wiring on the first insulating layer, in direct contact with the semiconductor layer through a first opening in the first insulating layer; a third wiring on the first insulating layer, in direct contact with the first wiring through a second opening in the first insulating layer, the third wiring having a same composition and structure as the second wiring; a second insulating layer over the first insulating layer, the second wiring, and the third wiring; a common electrode on the second insulating layer, in electrical contact with the first wiring through the third wiring; an island-shaped conductive layer having a same composition and structure as a portion of the common electrode; a third insulating layer over the second insulating layer, the common electrode, and the island-shaped conductive layer; a pixel electrode on the third insulating layer, overlapping the common electrode and in electrical contact with the semiconductor layer through the second wiring and the island-shaped conductive layer, wherein the pixel electrode is in direct contact with the island-shaped conductive layer through an opening in the third insulating layer, wherein the island-shaped conductive layer is in direct contact with the second wiring through an opening in the second insulating layer, wherein the island-shaped conductive layer overlaps with the pixel electrode, the opening in the third insulating layer, the opening in the second insulating layer, the second wiring, and the first opening in the first insulating layer, wherein an area of contact between the second wiring and the island-shaped conductive layer does not overlap the first wiring, and wherein an area of contact between the pixel electrode and the island-shaped conductive layer does not overlap the first wiring. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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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 NumberUS14/198,825Publication NumberTime in Patent Office551 DaysField of SearchNoneUS Class Current1/1CPC 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...
