LIQUID CRYSTAL DISPLAY DEVICE

• US 20180356693A1
• Filed: 06/01/2018
• Published: 12/13/2018
• Est. Priority Date: 06/07/2017
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: ITOU, Osamu
• Application Number:
  US15/995,329
• Publication Number:
  US 20180356693A1
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

The purpose of the invention is to realize a liquid crystal display device of high definition and high response speed. The representative structure is: a liquid crystal display device comprising: a first substrate and a second substrate, which sandwiches a liquid crystal layer; the pixel includes: a thin film transistor, a first electrode, a second electrode formed over the first electrode sandwiching an insulating film, a contact hole that connects the second electrode and the thin film transistor, the second electrode has a first portion that extends in the second direction, and a second portion that is wider in the first direction than the first portion, a first projection extending in the second direction over the video signal line, and a second projection, which is wider than the first projection in the first direction, at the position aligned with the second portion in the first direction are formed.

Claims

1. A liquid crystal display device comprising:

a first substrate having a plurality of scan lines extending in a first direction, a plurality of video signal lines extending in a second direction, which crosses the first direction, a pixel formed in an area surrounded by the video signal lines and the scan lines,

a second substrate opposing to the first substrate sandwiching a liquid crystal layer;

wherein

the pixel includes a thin film transistor, a first electrode, a second electrode formed over the first electrode sandwiching an insulating film, a contact hole that connects the second electrode and the thin film transistor,

the second electrode has a first portion that extends in the second direction, and a second portion that is wider in the first direction than the first portion,

a first projection extending in the second direction is formed over the video signal line,

a second projection, which is wider than the first projection in the first direction, is formed over the video signal line, and

the second portion and the second projection are arranged in the first direction.

2. The liquid crystal display device according to claim 1,

wherein the second portion and the second projection are circle shaped in a plan view.

3. The liquid crystal display device according to claim 1,

wherein a center of the second portion and a center of the second projection are aligned in line in a plan view.

4. The liquid crystal display device according to claim 1,

wherein the second portion is a parallelogram in a plan view and having a first side that crosses in 45 degree with the first direction,

the second projection is a parallelogram in a plan view and having a second side that crosses in 45 degree with the first direction,

the second portion and the second projection are proximate at their vertexes.

5. The liquid crystal display device according to claim 1,

wherein the second electrode has a third portion that is opposite end to the second portion,

the third portion is arc in a plan view.

6. The liquid crystal display device according to claim 1,

wherein a width of the first portion of the second electrode in the first direction becomes wider in going from the third portion to the second portion.

7. The liquid crystal display device according to claim 1,

wherein the first projection and the second projection are formed by a light shielding film.

8. The liquid crystal display device according to claim 1,

wherein a color filter is formed between the first electrode and the second substrate.

19. The liquid crystal display device according to claim 1,

wherein the second projection has a side wall, the angle of the side wall is 30 degree to 60 degree.

20. The liquid crystal display device according to claim 1,

wherein an initial alignment direction of the liquid crystal is in the second direction.

9. A liquid crystal display device comprising:

a first substrate having a plurality of scan lines extending in a first direction, a plurality of video signal lines extending in a second direction, which crosses the first direction, a pixel formed in an area surrounded by the video signal lines and the scan lines,

a second substrate opposing to the first substrate sandwiching a liquid crystal layer;

wherein

the pixel includes a thin film transistor, a first electrode, a second electrode formed over the first electrode sandwiching an insulating film, a contact hole that connects the second electrode and the thin film transistor,

the first electrode is formed in plane shape, the second electrode has a slit,

the slit has a first portion that extends in the second direction, and a second portion that is wider in the first direction than the first portion,

a first projection extending in the second direction over the video signal line, and

a second projection, which is wider than the first projection in the first direction, at the position nearer to the contact hole are formed.

10. The liquid crystal display device according to claim 9,

wherein the second portion of the slit is circle in a plan view, the second projection is circle in a plan view.

11. The liquid crystal display device according to claim 9,

wherein the second portion of the slit has a first side that crosses in 45 degree with the first direction,

the second projection has a second side that crosses in 45 degree with the first direction,

the first side and the second side oppose to each other.

12. The liquid crystal display device according to claim 9,

wherein the second portion is a parallelogram in a plan view and having a first side that crosses in 45 degree with the first direction,

the second projection is a parallelogram in a plan view and having a second side that crosses in 45 degree with the first direction,

the second portion and the second projection are proximate at their vertexes.

13. The liquid crystal display device according to claim 9,

wherein the slit has a third portion that is opposite end to the second portion,

the third portion is arc in a plan view.

14. The liquid crystal display device according to claim 9,

wherein a width of the first portion of the slit in the first direction becomes wider in going from the third portion to the second portion.

15. The liquid crystal display device according to claim 9,

wherein the first projection and the second projection are formed by a light shielding film.

16. The liquid crystal display device according to claim 9,

wherein a color filter is formed between the first electrode and the second substrate.

17. The liquid crystal display device according to claim 9,

wherein the slit is continuously made into an adjacent pixel in a lateral direction.

18. The liquid crystal display device according to claim 9,

wherein a third electrode is formed under the second electrode via a second insulating film, the voltage of the third electrode is the same as the first electrode.