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US 8,619,227 B2Granted
Liquid crystal display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHajime Kimura, Hideki Uochi
Life of this patent
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Abstract
It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode.
Claims43
A liquid crystal display device, comprising:
- a substrate;
- a gate electrode and a semiconductor layer over the substrate;
- a source electrode and a drain electrode over the semiconductor layer;
- a first insulating layer over the gate electrode;
- a first common electrode over the first insulating layer;
- a second insulating layer over the first common electrode;
- a second common electrode over the second insulating layer;
- a pixel electrode over the second insulating layer, the pixel electrode being electrically connected to one of the source electrode and the drain electrode;
- and
- a liquid crystal material over the pixel electrode and the second common electrode,
- wherein a part of the first common electrode overlaps with the second common electrode.
8 more elements
A liquid crystal display device, comprising:
- a substrate;
- a gate electrode and a semiconductor layer over the substrate;
- a source electrode and a drain electrode over the semiconductor layer;
- a first insulating layer over the gate electrode;
- a first common electrode over the first insulating layer;
- a second insulating layer over the first common electrode;
- a second common electrode over the second insulating layer;
- a pixel electrode over the second insulating layer, the pixel electrode being electrically connected to one of the source electrode and the drain electrode;
- and
- a liquid crystal material over the pixel electrode and the second common electrode,
- wherein a part of the first common electrode overlaps with the second common electrode, and
- wherein the first common electrode is a transmissive electrode.
9 more elements
A liquid crystal display device, comprising:
- a substrate;
- a gate electrode and a semiconductor layer over the substrate;
- a source electrode and a drain electrode over the semiconductor layer;
- a first insulating layer over the gate electrode;
- a first common electrode over the first insulating layer;
- a second insulating layer over the first common electrode;
- a second common electrode over the second insulating layer;
- a pixel electrode over the second insulating layer, the pixel electrode being electrically connected to one of the source electrode and the drain electrode;
- and
- a liquid crystal material over the pixel electrode and the second common electrode,
- wherein a part of the first common electrode overlaps with the second common electrode, and
- wherein the second common electrode is comb-shaped.
9 more elements
A liquid crystal display device, comprising:
- a substrate;
- a gate electrode and a semiconductor layer over the substrate;
- a source electrode and a drain electrode over the semiconductor layer;
- a first insulating layer over the gate electrode;
- a first common electrode over the first insulating layer;
- a second insulating layer over the first common electrode;
- a second common electrode over the second insulating layer;
- a pixel electrode over the second insulating layer, the pixel electrode being electrically connected to one of the source electrode and the drain electrode;
- and
- a liquid crystal material over the pixel electrode and the second common electrode,
- wherein a part of the first common electrode overlaps with the second common electrode, and
- wherein the first common electrode is a transmissive electrode, and
- wherein the second common electrode is comb-shaped.
10 more elements
A liquid crystal display device comprising:
- a substrate;
- a gate electrode and a semiconductor layer over the substrate;
- a first insulating layer over the gate electrode;
- a source electrode and a drain electrode over and electrically connected to the semiconductor layer, wherein each of the source electrode and the drain electrode comprises a first metal;
- a conductive layer comprising a second metal over and in contact with the first insulating layer, wherein the second metal is the same as the first metal;
- a first transparent conductive layer under and in contact with the conductive layer, wherein the first transparent conductive layer is over and in contact with the first insulating layer;
- a second insulating layer over the first transparent conductive layer;
- a second transparent conductive layer over the second insulating layer, the second transparent conductive layer having a slit;
- and
- a liquid crystal layer over the second transparent conductive layer, wherein the first transparent conductive layer and the second transparent conductive layer overlap with each other.
7 more elements
A liquid crystal display device comprising:
- a gate electrode;
- a first insulating layer over the gate electrode;
- a conductive layer comprising a metal over and in contact with the first insulating layer;
- a first transparent conductive layer under and in contact with the conductive layer, wherein the first transparent conductive layer is over and in contact with the first insulating layer;
- a second insulating layer over the first transparent conductive layer;
- a second transparent conductive layer over the second insulating layer, the second transparent conductive layer having a slit;
- and
- a liquid crystal layer over the second transparent conductive layer, wherein the first transparent conductive layer and the second transparent conductive layer overlap with each other.
5 more elements
Dependencies are inferred from the claim text.