Liquid crystal display device
First Claim
Patent Images
1. A liquid crystal display device comprising:
- a transistor comprising;
a gate electrode;
a semiconductor layer overlapping with the gate electrode; and
a gate insulating layer between the gate electrode and the semiconductor layer;
a first conductive layer on and in electrical contact with the semiconductor layer;
a second conductive layer on a same plane and of a same material as the first conductive layer;
a first insulating layer over the transistor and over the first and the second conductive layers;
a transmitting common electrode overlapping the second conductive layer;
a third conductive layer on and in direct contact with the transmitting common electrode, the third conductive layer overlapping the second conductive layer and the first insulating layer;
a second insulating layer on and in direct contact with the first insulating layer and with the third conductive layer; and
a transmitting pixel electrode on and in direct contact with the second insulating layer, overlapping the transmitting common electrode, and in electrical contact with the first conductive layer via a second contact hole in the second insulating layer and a first contact hole in the first insulating layer,wherein the first contact hole and the second contact hole overlap.
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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
30 Claims
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1. A liquid crystal display device comprising:
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a transistor comprising; a gate electrode; a semiconductor layer overlapping with the gate electrode; and a gate insulating layer between the gate electrode and the semiconductor layer; a first conductive layer on and in electrical contact with the semiconductor layer; a second conductive layer on a same plane and of a same material as the first conductive layer; a first insulating layer over the transistor and over the first and the second conductive layers; a transmitting common electrode overlapping the second conductive layer; a third conductive layer on and in direct contact with the transmitting common electrode, the third conductive layer overlapping the second conductive layer and the first insulating layer; a second insulating layer on and in direct contact with the first insulating layer and with the third conductive layer; and a transmitting pixel electrode on and in direct contact with the second insulating layer, overlapping the transmitting common electrode, and in electrical contact with the first conductive layer via a second contact hole in the second insulating layer and a first contact hole in the first insulating layer, wherein the first contact hole and the second contact hole overlap. - View Dependent Claims (4, 7, 10, 13, 16, 19, 22, 25, 28)
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2. A liquid crystal display device comprising:
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a transistor comprising; a gate electrode; a semiconductor layer overlapping with the gate electrode; and a gate insulating layer between the gate electrode and the semiconductor layer; a first conductive layer on and in electrical contact with the semiconductor layer; a second conductive layer on a same plane and of a same material as the first conductive layer; a first insulating layer over the transistor and on and in direct contact with the first and the second conductive layers; a transmitting common electrode overlapping the second conductive layer; a third conductive layer on and in direct contact with the transmitting common electrode, the third conductive layer overlapping the second conductive layer and the first insulating layer; a second insulating layer on and in direct contact with the first insulating layer and with the third conductive layer; and a transmitting pixel electrode on and in direct contact with the second insulating layer, overlapping the transmitting common electrode, and in electrical contact with the first conductive layer via a second contact hole in the second insulating layer and a first contact hole in the first insulating layer, wherein the first contact hole and the second contact hole overlap. - View Dependent Claims (5, 8, 11, 14, 17, 20, 23, 26, 29)
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3. A liquid crystal display device comprising:
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a transistor comprising; a gate electrode; a semiconductor layer overlapping with the gate electrode; and a gate insulating layer between the gate electrode and the semiconductor layer; a first conductive layer on and in electrical contact with the semiconductor layer; a second conductive layer on a same plane and of a same material as the first conductive layer; a first insulating layer over the transistor and over the first and the second conductive layers; a transmitting common electrode overlapping the second conductive layer; a third conductive layer on and in direct contact with the transmitting common electrode, the third conductive layer overlapping the second conductive layer and the first insulating layer; a second insulating layer on and in direct contact with the first insulating layer and with the third conductive layer; and a transmitting pixel electrode on and in direct contact with the second insulating layer, overlapping the transmitting common electrode, and in electrical contact with the first conductive layer via a second contact hole in the second insulating layer and a first contact hole in the first insulating layer, wherein the first contact hole and the second contact hole overlap, and wherein a bottom portion of the second contact hole is narrower than a top portion of the first contact hole when seen in a cross-section view. - View Dependent Claims (6, 9, 12, 15, 18, 21, 24, 27, 30)
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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 NumberUS14/614,552Publication NumberTime in Patent Office558 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...
