Liquid crystal display device comprising a semiconductor film having a channel formation region overlapping with a conductive film in a floating state
First Claim
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1. A liquid crystal display device comprising:
- a first substrate;
a conductive film over the first substrate;
a first insulating film over the conductive film;
a semiconductor film comprising a channel formation region over the first insulating film;
a gate insulating film over the semiconductor film;
a gate electrode over the semiconductor film with the gate insulating film therebetween;
a source wiring electrically connected to the semiconductor film,a common electrode over the first substrate;
a wiring over and electrically connected to the common electrode;
a second insulating film over the common electrode;
a pixel electrode over the second insulating film;
a liquid crystal over the pixel electrode; and
a second substrate over the liquid crystal,wherein the conductive film is in a floating state,wherein the channel formation region overlaps with the conductive film,wherein the source wiring overlaps with the conductive film,wherein the common electrode has light-transmitting property,wherein the pixel electrode and the common electrode overlaps with each other at least partly, andwherein the common electrode is shared by a plurality of pixels aligned in a source wiring direction.
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Abstract
By increasing an interval between electrodes which drives liquid crystals, a gradient of an electric field applied between the electrodes can be controlled and an optimal electric field can be applied between the electrodes. The invention includes a first electrode formed over a substrate, an insulating film formed over the substrate and the first electrode, a thin film transistor including a semiconductor film in which a source, a channel region, and a drain are formed over the insulating film, a second electrode located over the semiconductor film and the first electrode and including first opening patterns, and liquid crystals provided over the second electrode.
225 Citations
16 Claims
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1. A liquid crystal display device comprising:
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a first substrate; a conductive film over the first substrate; a first insulating film over the conductive film; a semiconductor film comprising a channel formation region over the first insulating film; a gate insulating film over the semiconductor film; a gate electrode over the semiconductor film with the gate insulating film therebetween; a source wiring electrically connected to the semiconductor film, a common electrode over the first substrate; a wiring over and electrically connected to the common electrode; a second insulating film over the common electrode; a pixel electrode over the second insulating film; a liquid crystal over the pixel electrode; and a second substrate over the liquid crystal, wherein the conductive film is in a floating state, wherein the channel formation region overlaps with the conductive film, wherein the source wiring overlaps with the conductive film, wherein the common electrode has light-transmitting property, wherein the pixel electrode and the common electrode overlaps with each other at least partly, and wherein the common electrode is shared by a plurality of pixels aligned in a source wiring direction. - View Dependent Claims (2, 3, 4, 5)
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6. A liquid crystal display device comprising:
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a first substrate; a conductive film over the first substrate; a first insulating film over the conductive film; a semiconductor film comprising a channel formation region over the first insulating film; a gate insulating film over the semiconductor film; a gate electrode over the semiconductor film with the gate insulating film therebetween; a source wiring electrically connected to the semiconductor film, an electrode in contact with a region of the semiconductor film through a first opening in the gate insulating film, a common electrode over the first substrate; a wiring over and electrically connected to the common electrode; a second insulating film over the common electrode; a pixel electrode in contact with a region of the electrode through an opening in the second insulating film; a liquid crystal over the pixel electrode; and a second substrate over the liquid crystal, wherein the region of the electrode does not overlap with the region of the semiconductor film, wherein the conductive film is in a floating state, wherein the channel formation region overlaps with the conductive film, wherein the source wiring overlaps with the conductive film, wherein the common electrode has light-transmitting property, wherein the pixel electrode and the common electrode overlaps with each other at least partly, and wherein the common electrode is shared by a plurality of pixels aligned in a source wiring direction. - View Dependent Claims (7, 8, 9, 10)
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11. A liquid crystal display device comprising:
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a first substrate; a conductive film over the first substrate; a first insulating film over the conductive film; a semiconductor film comprising a channel formation region over the first insulating film; a gate insulating film over the semiconductor film; a gate electrode over the semiconductor film with the gate insulating film therebetween; a source wiring in contact with the semiconductor film through an opening in the gate insulating film, a common electrode over the first substrate; a wiring over and electrically connected to the common electrode; a second insulating film over the common electrode; a pixel electrode over the second insulating film; a liquid crystal over the pixel electrode; and a second substrate over the liquid crystal, wherein the conductive film is in a floating state, wherein the opening in the gate insulating film overlaps with the conductive film, wherein the common electrode has light-transmitting property, wherein the pixel electrode and the common electrode overlaps with each other at least partly, and wherein the common electrode is shared by a plurality of pixels aligned in a source wiring direction. - View Dependent Claims (12, 13, 14, 15, 16)
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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
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Primary Examiner(s)Lee, Paul C
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Application NumberUS16/520,560Publication NumberTime in Patent Office146 DaysField of SearchUS Class CurrentCPC Class CodesG02F 1/133345 Insulating layers G02F1/133...G02F 1/1337 Surface-induced orientation...G02F 1/133707 Structures for producing di...G02F 1/134309 characterised by their geom...G02F 1/134318 having a patterned common e...G02F 1/134363 for applying an electric fi...G02F 1/134372 for fringe field switching ...G02F 1/13439 characterised by their elec...G02F 1/136 Liquid crystal cells struct...G02F 1/136227 Through-hole connection of ...G02F 1/136277 formed on a semiconductor s...G02F 1/136286 Wiring, e.g. gate line, dra...G02F 1/1368 in which the switching elem...G02F 1/13685 Top gatesG02F 2201/121 common or background
