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US 2015/0145897 A1Published application
Liquid Crystal Display Device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei Yamazaki, Jun Koyama
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Abstract
An object of the present invention is to provide a small-sized active matrix type liquid crystal display device that may achieve large-sized display, high precision, high resolution and multi-gray scales. According to the present invention, gray scale display is performed by combining time ratio gray scale and voltage gray scale in a liquid crystal display device which performs display in OCB mode. In doing so, one frame is divided into subframes corresponding to the number of bit for the time ratio gray scale. Initialize voltage is applied onto the liquid crystal upon display of a subframe.
Claims38
(canceled)
A display device comprising:
- a substrate;
- a semiconductor layer over the substrate;
- a source electrode electrically connected to the semiconductor layer;
- a drain electrode electrically connected to the semiconductor layer;
- a first insulating film over the source electrode and the drain electrode, the first insulating film with an opening;
- a conductive layer over the first insulating film;
- a second insulating film over the conductive layer;
- and
- a pixel electrode over the second insulating film,
- wherein the pixel electrode is electrically connected to the drain electrode,
- wherein the pixel electrode comprises a first portion, a second portion, a third portion, and a fourth portion,
- wherein the fourth portion is above the third portion, the third portion is above the second portion, and the second portion is above the first portion,
- wherein the first portion comprises a surface along the first insulating film,
- wherein an undersurface of the second portion is approximately parallel to the surface of the substrate,
- wherein the third portion comprises a surface along the second insulating film, and
- wherein an undersurface of the fourth portion is approximately parallel to the surface of the substrate.
13 more elements
A display device comprising:
- a substrate;
- a semiconductor layer over the substrate;
- a source electrode electrically connected to the semiconductor layer;
- a drain electrode electrically connected to the semiconductor layer;
- a first insulating film over the source electrode and the drain electrode, the first insulating film with an opening;
- a conductive layer over the first insulating film;
- a second insulating film over the conductive layer;
- and
- a pixel electrode over the second insulating film,
- wherein the pixel electrode is electrically connected to the drain electrode,
- wherein the pixel electrode comprises a first portion, a second portion, a third portion, and a fourth portion,
- wherein the fourth portion is above the third portion, the third portion is above the second portion, and the second portion is above the first portion,
- wherein the first portion comprises a surface along the first insulating film and is in contact with the first insulating film,
- wherein an undersurface of the second portion is approximately parallel to the surface of the substrate,
- wherein the third portion comprises a surface along the second insulating film and is in contact with the second insulating film, and
- wherein an undersurface of the fourth portion is approximately parallel to the surface of the substrate.
13 more elements
A display device comprising:
- a substrate;
- a semiconductor layer over the substrate;
- a source electrode electrically connected to the semiconductor layer;
- a drain electrode electrically connected to the semiconductor layer;
- a first insulating film over the source electrode and the drain electrode, the first insulating film with an opening;
- a conductive layer over the first insulating film,
- a second insulating film over the conductive layer;
- and
- a pixel electrode over the second insulating film,
- wherein the pixel electrode is electrically connected to the drain electrode,
- wherein the pixel electrode comprises a first portion, a second portion, a third portion, and a fourth portion,
- wherein the first portion is above the second portion, the second portion is above the third portion, the third portion is above the fourth portion,
- wherein the first portion comprises a surface along the second insulating film,
- wherein an undersurface of the second portion is approximately parallel to the surface of the substrate,
- wherein the third portion comprises a surface to be inclined with respect to the surface of the substrate, and
- wherein an undersurface of the fourth portion is approximately parallel to the surface of the substrate.
13 more elements
A display device comprising:
- a substrate;
- a semiconductor layer over the substrate;
- a source electrode electrically connected to the semiconductor layer;
- a drain electrode electrically connected to the semiconductor layer;
- a first insulating film over the source electrode and the drain electrode, the first insulating film with an opening;
- a conductive layer over the first insulating film;
- a second insulating film over the conductive layer;
- and
- a pixel electrode over the second insulating film;
- wherein the pixel electrode is electrically connected to the drain electrode,
- wherein the pixel electrode comprises a first portion, a second portion, a third portion, and a fourth portion,
- wherein the first portion is above the second portion, the second portion is above the third portion, the third portion is above the fourth portion,
- wherein the first portion comprises a surface along the second insulating film and is in contact with the second insulating film,
- wherein an undersurface of the second portion is approximately parallel to the surface of the substrate,
- wherein the third portion comprises a surface to be inclined with respect to the surface of the substrate and is in contact with the first insulating film, and
- wherein an undersurface of the fourth portion is approximately parallel to the surface of the substrate.
13 more elements
Dependencies are inferred from the claim text.