Active matrix substrate, liquid crystal display device, and method of manufacturing liquid crystal display device
AssigneeNEC LCD Technologies, Ltd.
InventorsTaku Kawasaki, Shinichi Nishida, Takayuki Konno
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Abstract
A pixel electrode connected to a signal line through a switching element and a common electrode connected to a common wiring are disposed, as alternating with each other, within each pixel region. Common potential lines are disposed on level below the signal line with an insulating film in between and also on both sides of the signal line when seen in plan view. A floating electrode is disposed on level above the signal line with a protective film in between, as overlapping the signal line and the common potential lines on both sides of the signal line.
Claims19
An active matrix substrate comprising:
- a plurality of scan lines and a plurality of common wirings;
- a plurality of signal lines crossing the plurality of scan lines and the plurality of common wirings;
- and
- a switching element disposed in each of pixels surrounded by the scan lines and the signal lines,
- wherein common potential lines connected to the common wiring are formed on level below the signal line with a first insulating film in between and also on both sides of the signal line as viewed from the normal direction thereto, and
- a floating electrode is formed on level above the signal line with a second insulating film in between, as overlapping the signal line and at least a portion of each of the common potential lines on both sides of the signal line as viewed from the normal direction thereto.
A liquid crystal display device including an active matrix substrate, a counter substrate opposed to the active matrix substrate, and a liquid crystal layer sandwiched between the substrates,
- the active matrix substrate comprising:
- a plurality of scan lines and a plurality of common wirings;
- a plurality of signal lines crossing the plurality of scan lines and the plurality of common wirings;
- and
- a switching element disposed in each of pixels surrounded by the scan lines and the signal lines,
- wherein common potential lines connected to the common wiring are formed on level below the signal line with a first insulating film in between and also on both sides of the signal line as viewed from the normal direction to the substrate, and
- a floating electrode is formed on level above the signal line with a second insulating film in between, as overlapping the signal line and at least a portion of each of the common potential lines on both sides of the signal line as viewed from the normal direction to the substrate.
A method of manufacturing a liquid crystal display device, comprising:
- a first step of forming a plurality of scan lines and a plurality of common wirings on a substrate and forming a common electrode within a forming region for a pixel, the common electrode being connected to the common wiring;
- a second step of forming a first insulating film;
- a third step of forming a semiconductor layer to form a switching element;
- a fourth step of forming a plurality of signal lines and forming a pixel electrode, the signal lines crossing the scan lines and being each connected to one electrode of the switching element, the pixel electrode being connected to the other electrode of the switching element within each pixel;
- and
- a fifth step of forming a second insulating film,
- wherein the fourth step follows a step of forming common potential lines, to be connected to the common wiring, on both sides of the signal line as viewed from the normal direction to the substrate, and
- the fifth step is further followed by a sixth step of forming a floating electrode as overlapping the signal line and at least a portion of each of the common potential lines on both sides of the signal line as viewed from the normal direction to the substrate.
Dependencies are inferred from the claim text.