Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9632370-B2
Application number	US-201414310635-A
Country	US
Kind code	B2
Filing date	Jun 20, 2014
Priority date	Sep 7, 1999
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A liquid crystal display includes a first substrate and a second substrate opposed to each other with a liquid crystal layer between the first substrate and the second substrate. The first substrate has a plurality of drain signal lines and a plurality of gate signal lines, and a plurality of pixel regions are defined by the drain signal lines and the gate signal lines. Each of the pixel regions includes a first electrode having a plurality of strip-like portions extending in an extension direction of the drain signal lines, the strip-like portions having at least one bent portion so that extension directions of each two parts of the strip-like portions separated by the at least one bent portion are different from each other, and a second electrode formed between the first substrate and the first electrode, and being overlapped with the strip-like portions in plan view.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first substrate and a second substrate opposed to each other with a liquid crystal layer between the first substrate and the second substrate, the first substrate having a plurality of drain signal lines and a plurality of gate signal lines; and
a plurality of pixel regions defined by the drain signal lines and the gate signal lines;
wherein each of the pixel regions includes:
a first electrode having a plurality of strip-like portions extending in an extension direction of the drain signal lines, the strip-like portions having a plurality of bent portions so that extension directions of each two parts of the strip-like portions separated by each bent portion are different from each other; and
a second electrode, which is a transparent electrode, formed between the first substrate and the first electrode, and being overlapped with the strip-like portions in plan view,
wherein
each of the bent portions of the strip-like portions is overlapped with the second electrode in plan view, and
the strip-like portions are extended so that after being inclined with respect to the extension direction of the drain signal lines by an angle θ, said strip-like portions are bent by an angle (−2θ), and the angle θ is in a range of 5 degrees to 40 degrees.

2. The liquid crystal display according to claim 1 ,
wherein the strip-like portions are formed in each of the pixel regions and overlapped with the second electrode in plan view.

3. The liquid crystal display according to the claim 1 ,
wherein the strip-like portions are arranged so as to extend in an extension direction of the gate signal lines in each of the pixel regions.

4. The liquid crystal display according to claim 1 ,
wherein all of the strip-like portions which extend in the extension direction of the drain signal lines are overlapped with the second electrode in plan view.

5. The liquid crystal display according to claim 1 ,
wherein all of the strip-like portions are formed in each of the pixel regions and are overlapped with the second electrode in plan view.

6. The liquid crystal display according to claim 1 ,
wherein the first electrode has a plurality of slits extending in the extension direction of the strip-like portions; and
wherein the slits are overlapped with the second electrode in plan view.

7. The liquid crystal display according to claim 1 ,
wherein the first electrode has at least three of the strip-like portions.

8. The liquid crystal display according to claim 1 ,
wherein said bent portions of the strip-like portions have same inclined angles.

9. The liquid crystal display according to claim 1 ,
wherein the strip-like portions are formed in a symmetric fashion with respect to a line drawn in an extension direction of the gate signal lines through a center of each of the pixel regions.

10. The liquid crystal display according to claim 1 ,
further comprising thin film transistors connected to the drain signal lines;
wherein the gate signal lines are overlapped with the thin film transistors in plan view.

11. The liquid crystal display according to claim 1 ,
wherein the first electrode is a transparent electrode.

12. The liquid crystal display according to claim 1 ,
wherein the second electrode is not overlapped with the drain signal lines or the gate signal lines in plan view.

13. The liquid crystal display according to claim 1 ,
wherein the drain signal line is arranged in a layer between a layer having the first electrode and a layer having the second electrode.

14. The liquid crystal display according to claim 1 ,
wherein the second electrode is closer to the first substrate than a position of the first electrode to the first substrate.

15. The liquid crystal display according to claim 1 ,
wherein the liquid crystal layer is a P-type liquid crystal layer.

16. The liquid crystal display according to claim 15 ,
wherein the extension direction of the drain signal lines is aligned with a direction in which the liquid crystal molecules are oriented in the state that the electric field is not applied to the liquid crystal molecules.

17. A liquid crystal display comprising:
a first substrate and a second substrate opposed to each other with a liquid crystal layer between the first substrate and the second substrate, the first substrate having a plurality of drain signal lines and a plurality of gate signal lines; and
a plurality of pixel regions defined by the drain signal lines and the gate signal lines;
wherein each of the pixel regions includes:
a pixel electrode having a plurality of strip-like portions, the strip-like portions having a plurality of bent portions so that extension directions of each two parts of the strip-like portions separated by each bent portion are different from each other; and
a common electrode, which is a transparent electrode, formed between the first substrate and a portion of the pixel electrode, and being overlapped with the strip-like portions in plan view,
wherein each of the bent portions of the strip-like portions is overlapped with the common electrode in plan view, and
the strip-like portions are extended so that after being inclined with respect to the extension direction of the drain signal lines by an angle θ, said strip-like portions are bent by an angle (−2θ), and the angle θ is in a range of 5 degrees to 40 degrees.

18. The liquid crystal display according to claim 17 ,
wherein the common electrode is closer to the first substrate than a position of the pixel electrode to the first substrate.

19. The liquid crystal display according to claim 17 ,
wherein the liquid crystal layer is a P-type liquid crystal layer, and
wherein the extension direction of the drain signal lines is aligned with a direction in which the liquid crystal molecules are oriented in the state that the electric field is not applied to the liquid crystal molecules.

Assignees

• Japan Display Inc
• Panasonic Liquid Crystal Displ

Inventors

• Ono Kikuo
• Yoneya Makoto
• Yamamoto Tsunenori
• Hirakata Junichi
• Nakayoshi Yoshiaki

Classifications

• G02F2201/40

  Arrangements for improving the aperture ratio · CPC title

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• G02F1/13458

  Terminal pads · CPC title

• G02F1/13394

  spacers regularly patterned on the cell subtrate, e.g. walls, pillars (G02F1/133377 takes precedence) · CPC title

• G02F1/1393

  the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence) · CPC title