LIQUID CRYSTAL DISPLAY DEVICE

• US 20150098052A1
• Filed: 10/02/2014
• Published: 04/09/2015
• Est. Priority Date: 10/03/2013
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: HIROSAWA, Jin, MORITA, Yusuke
• Application Number:
  US14/504,532
• Publication Number:
  US 20150098052A1
• Time in Patent Office: Days
• US Class Current: 349/139
• 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 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates

Abstract

A liquid crystal display device includes a first substrate and a second substrate. The first substrate includes a pixel electrode having a contact portion and a main pixel electrode extending in a second direction from the contact portion so as to form one end opposite to the contact portion. The second substrate includes a pair of main common electrodes arranged on both sides sandwiching the main pixel electrode and extending in the second direction. The width of the contact portion in a first direction orthogonally crossing the second direction is larger than the width of the main pixel electrode in the first direction. The main common electrode includes a convex portion provided in a position more apart from the contact portion than the one end of the main pixel electrode and protruding in the first direction.

Claims

1. A liquid crystal display device, comprising:

a first substrate including a pixel electrode including a contact portion and a main pixel electrode extending in a second direction from the contact portion so as to form one end opposite to the contact portion;

a second substrate including a pair of main common electrodes arranged on both sides sandwiching the main pixel electrode and respectively having an end extending in the second direction; and

a liquid crystal layer held between the first substrate and the second substrate, wherein

the width of the contact portion in a first direction orthogonally crossing the second direction is larger than the width of the main pixel electrode in the first direction, and

the main common electrode includes a convex portion provided in a position more apart from the contact portion than the one end of the main pixel electrode and protruding in the first direction.

3. The liquid crystal display device according to claim 1, wherein the width of the concave portion in the first direction is set to become continuously larger as the concave portion is apart from the contact portion.

4. The liquid crystal display device according to claim 1, wherein the width of the concave portion in the first direction is set to become larger in a step-like shape as the concave portion is apart from the contact portion.

5. The liquid crystal display device according to claim 1, wherein the concave portion includes a first end having one end portion and extending in the first direction, and a second end connected with the one end portion of the first end and the end of the main common electrode extending in the second direction.

6. The liquid crystal display device according to claim 5, wherein the second end is formed in a line shape.

7. The liquid crystal display device according to claim 5, wherein the second end is formed in a curved shape.

8. The liquid crystal display device according to claim 1, wherein the concave portion is formed by being surrounded with one end extending in the first direction and another end extending in the second direction.

9. The liquid crystal display device according to claim 1, wherein

the concave portion includes a third end and a fourth end extending in the first direction, and

the third end is longer than the fourth end, and located more apart from the contact portion than the fourth end is apart from the contact portion.

10. The liquid crystal display device according to claim 1, wherein the main pixel electrode is provided in a pixel in which the length along the first direction is shorter than the length along the second direction.

2. A liquid crystal display device, comprising:

a first substrate including a pixel electrode including a contact portion and a main pixel electrode extending in a second direction from the contact portion so as to form one end opposite to the contact portion;

a second substrate including a pair of first main common electrodes arranged on both sides sandwiching the main pixel electrode and respectively having an end extending in the second direction; and

a liquid crystal layer held between the first substrate and the second substrate, wherein

the first substrate includes a pair of second main common electrodes facing the first main common electrodes,

the width of the contact portion in a first direction orthogonally crossing the second direction is larger than the width of the main pixel electrode in the first direction, and

the second main common electrode includes a convex portion provided in a position more apart from the contact portion than the one end of the main pixel electrode and protruding in the first direction.

11. A liquid crystal display device, comprising:

a first substrate including;

first and second gate lines extending in a first direction,

first and second source lines extending in a second direction orthogonally crossing the first direction, and

a pixel electrode including a contact portion and a main pixel electrode electrically coupled with the contact portion and extending in the second direction from the contact portion so as to form one end opposite to the contact portion;

a second substrate including a pair of main common electrodes arranged on both sides sandwiching the main pixel electrode and respectively having an end extending in the second direction; and

a liquid crystal layer held between the first substrate and the second substrate, wherein

the width of the contact portion in the first direction is larger than the width of the main pixel electrode in the first direction,

the main common electrode includes a convex portion provided adjacent to the second gate line in a region between the one end of the main pixel electrode and the second gate line, and

the convex portion protrudes from the end of the main common electrode in the first direction.

13. The liquid crystal display device according to claim 11, wherein the contact portion is arranged adjacent to the first gate line.

14. The liquid crystal display device according to claim 11, wherein the width of the concave portion in the first direction is set to become continuously larger as the concave portion closes to the second gate line.

15. The liquid crystal display device according to claim 11, wherein the width of the concave portion in the first direction is set to become larger in a step-like shape as the concave portion closes to the second gate line.

16. The liquid crystal display device according to claim 11, wherein the concave portion includes a first end having one end portion extending in the first direction and a second end connected with the one end portion of the first end and the end of the second main common electrode.

17. The liquid crystal display device according to claim 16, wherein the second end is formed in a line shape.

18. The liquid crystal display device according to claim 16, wherein the second end is formed in a curved shape.

19. The liquid crystal display device according to claim 11, wherein the concave portion is formed by being surrounded with one end extending in the first direction and another end extending in the second direction.

20. The liquid crystal display device according to claim 11, wherein

the concave portion includes a third end and a fourth end extending in the first direction in parallel each other, and

the third end is longer than the fourth end, and located adjacent to the second gate line.

12. A liquid crystal display device, comprising:

a first substrate including;

first and second gate lines extending in a first direction,

first and second source lines extending in a second direction orthogonally crossing the first direction, and

a pixel electrode including a contact portion and a main pixel electrode electrically coupled with the contact portion and extending in the second direction from the contact portion so as to form one end opposite to the contact portion;

a second substrate including a pair of first main common electrodes arranged on both sides sandwiching the main pixel electrode and extending in the second direction; and

a liquid crystal layer held between the first substrate and the second substrate, wherein

the first substrate includes a pair of second main common electrodes facing the first main common electrodes,

the width of the contact portion in the first direction is larger than the width of the main pixel electrode in the first direction,

the second main common electrode includes a convex portion provided adjacent to the second gate line in a region between the one end of the main pixel electrode and the second gate line, and

the second main common electrode includes an end extending along the second direction, and the convex portion protrudes from the end of the second main common electrode in the first direction.