Liquid crystal display device
First Claim
Patent Images
1. A liquid crystal display device comprising:
- a transistor over a substrate, the transistor comprising;
a semiconductor layer;
a gate insulating film over the semiconductor layer; and
a gate electrode over the gate insulating film;
a first insulating layer over the transistor;
a first wiring over the first insulating layer, the first wiring in contact with the semiconductor layer through an opening of the first insulating layer;
a second wiring over the first insulating layer;
a second insulating layer over the first wiring and the second wiring;
a common electrode over the second insulating layer, the common electrode electrically connected to the second wiring;
a third insulating layer over the common electrode;
a pixel electrode over the third insulating layer, the pixel electrode electrically connected to one of a source and a drain of the transistor;
a liquid crystal layer overlapping the pixel electrode and the common electrode,wherein the first wiring and the second wiring comprise the same material, andwherein the pixel electrode includes a slit.
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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.
84 Citations
18 Claims
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1. A liquid crystal display device comprising:
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a transistor over a substrate, the transistor comprising; a semiconductor layer; a gate insulating film over the semiconductor layer; and a gate electrode over the gate insulating film; a first insulating layer over the transistor; a first wiring over the first insulating layer, the first wiring in contact with the semiconductor layer through an opening of the first insulating layer; a second wiring over the first insulating layer; a second insulating layer over the first wiring and the second wiring; a common electrode over the second insulating layer, the common electrode electrically connected to the second wiring; a third insulating layer over the common electrode; a pixel electrode over the third insulating layer, the pixel electrode electrically connected to one of a source and a drain of the transistor; a liquid crystal layer overlapping the pixel electrode and the common electrode, wherein the first wiring and the second wiring comprise the same material, and wherein the pixel electrode includes a slit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A liquid crystal display device comprising:
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a transistor over a substrate, the transistor comprising; a semiconductor layer; a gate electrode; and a gate insulating film between the semiconductor layer and the gate electrode, a first insulating layer over the transistor; a first wiring over the first insulating layer, the first wiring in contact with the semiconductor layer through an opening of the first insulating layer; a second wiring over the first insulating layer; a second insulating layer over the first wiring and the second wiring; a common electrode over the second insulating layer, the common electrode electrically connected to the second wiring; a third insulating layer over the common electrode; a pixel electrode over the third insulating layer, the pixel electrode electrically connected to one of a source and a drain of the transistor; a liquid crystal layer overlapping the pixel electrode and the common electrode, wherein the first wiring and the second wiring comprise the same material, and wherein the pixel electrode includes a slit. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A liquid crystal display device comprising:
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a transistor over a substrate, the transistor comprising; a semiconductor layer; a gate insulating film over the semiconductor layer; and a gate electrode over the gate insulating film; a first insulating layer over the transistor; a first wiring over the first insulating layer, the first wiring in contact with the semiconductor layer through an opening of the first insulating layer; a second wiring over the first insulating layer; a second insulating layer over the first wiring and the second wiring; a common electrode over the second insulating layer, the common electrode electrically connected to the second wiring; a third insulating layer over the common electrode; a pixel electrode over the third insulating layer, the pixel electrode electrically connected to one of a source and a drain of the transistor; a liquid crystal layer overlapping the pixel electrode and the common electrode, wherein the first wiring and the second wiring comprise the same material, wherein the pixel electrode includes a slit, and wherein the liquid crystal display device is configured to display an image by an FFS mode. - View Dependent Claims (14, 15, 16, 17, 18)
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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 M
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Application NumberUS15/826,776Publication NumberTime in Patent Office439 DaysField of SearchNoneUS Class CurrentCPC 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...
