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US 7,872,722 B2Granted
Liquid crystal display device and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
Estimating the term…
Abstract
To provide a semiconductor device, a liquid crystal display device, and an electronic device which have a wide viewing angle and in which the number of manufacturing steps, the number of masks, and manufacturing cost are reduced compared with a conventional one. The liquid crystal display device includes a first electrode formed over an entire surface of one side of a substrate; a first insulating film formed over the first electrode; a thin film transistor formed over the first insulating film; a second insulating film formed over the thin film transistor; a second electrode formed over the second insulating film and having a plurality of openings; and a liquid crystal over the second electrode. The liquid crystal is controlled by an electric field between the first electrode and the second electrode.
Claims27
A liquid crystal display device comprising:
- a first electrode formed over an entire surface of one side of a substrate;
- a first insulating film formed over the first electrode;
- a thin film transistor formed over the first insulating film;
- a second insulating film formed over the thin film transistor, wherein the second insulating film has an opening;
- a third insulating film formed over the second insulating film and in the opening of the second insulating film;
- a second electrode formed over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film and is electrically connected to the thin film transistor;
- and
- a liquid crystal over the second electrode,
- wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
6 more elements
A liquid crystal display device comprising:
- a first electrode formed over an entire surface of one side of a substrate;
- a first insulating film formed over the first electrode;
- a thin film transistor formed over the first insulating film;
- the thin film transistor comprising:
- a semiconductor film formed over the first electrode;
- a gate insulating film formed over the semiconductor film;
- a gate electrode formed over the gate insulating film;
- a second insulating film formed over the gate electrode, wherein the second insulating film has an opening;
- a third insulating film formed over the second insulating film and in the opening of the second insulating film;
- a second electrode formed over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film and is electrically connected to the thin film transistor;
- and
- a liquid crystal over the second electrode,
- wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
10 more elements
A liquid crystal display device comprising:
- a first electrode formed over an entire surface of one side of a substrate;
- a first insulating film formed over the first electrode;
- a thin film transistor formed over the first insulating film;
- the thin film transistor comprising:
- a gate electrode formed over the first electrode;
- a gate insulating film formed over the gate electrode;
- a semiconductor film formed over the gate insulating film;
- a second insulating film formed over the semiconductor film, wherein the second insulating film has an opening;
- a third insulating film formed over the second insulating film and in the opening of the second insulating film;
- a second electrode formed over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film and is electrically connected to the thin film transistor;
- and
- a liquid crystal over the second electrode,
- wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
10 more elements
A liquid crystal display device comprising:
- a first electrode formed over an entire surface of one side of a substrate;
- a first insulating film formed over the first electrode;
- a thin film transistor formed over the first insulating film, the thin film transistor comprising a semiconductor film;
- a second insulating film formed over the thin film transistor;
- a second electrode formed over the second insulating film, wherein the second electrode has a plurality of openings and is directly connected to the semiconductor film;
- and
- a liquid crystal over the second electrode,
- wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
5 more elements
A method for manufacturing a liquid crystal display device, comprising the steps of:
- forming a first electrode over a first substrate;
- forming a first insulating film over the first electrode without patterning the first electrode;
- forming a thin film transistor over the first insulating film;
- forming a second insulating film over the thin film transistor, wherein the second insulating film has an opening;
- forming a third insulating film over the second insulating film and in the opening of the second insulating film;
- forming a second electrode electrically connected to the thin film transistor over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film;
- and
- attaching a second substrate to the first substrate with a liquid crystal therebetween.
5 more elements
A liquid crystal display device comprising:
- a first electrode formed over an entire surface of one side of a substrate;
- a first insulating film formed over the first electrode;
- a thin film transistor formed over the first insulating film;
- a second insulating film formed over the thin film transistor;
- a second electrode formed over the second insulating film, wherein the second electrode has a plurality of openings and is electrically connected to the thin film transistor;
- and
- a liquid crystal over the second electrode,
- wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode, and
- wherein a distance between the first electrode and the second electrode in a first region is smaller than that in a second region.
6 more elements
Dependencies are inferred from the claim text.