Liquid crystal display device

• US 10,642,115 B2
• Filed: 03/30/2018
• Issued: 05/05/2020
• Est. Priority Date: 03/30/2018
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakagawa, Teruhisa
• Primary Examiner(s): Nguyen, Hoan C
• Application Number:
  US15/942,021
• Publication Number:
  US 20190302549A1
• Time in Patent Office: 767 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 1/133519 Overcoatings
• CPC Class Codes: G02F 1/133723 Polyimide, polyamide-imide
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134336 Matrix
• 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 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• 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
• CPC Class Codes: G02F 2201/122 having a particular pattern
• CPC Class Codes: G02F 2201/123 pixel

Abstract

Examples of liquid crystal display devices are described herein. In an example, a liquid crystal display device comprises a first substrate, a second substrate, and a liquid crystal layer therebetween. The second substrate comprises a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, and a plurality of pixels in a matrix arrangement. A pixel from the plurality of pixels being defined by two adjacent source lines and two adjacent gate lines. A pixel electrode formed in the pixel comprises a plurality of slits. The plurality of slits includes a first set of slit segments extending in a first direction, and a second set of slit segments extending in a second direction. Further, a first light blocking member extends along a common boundary area of the first set of slit segments and the second set of slit segments.

Claims

1. A liquid crystal display device comprising:

a first substrate including a black matrix;

a second substrate opposite to the first substrate; and

a liquid crystal layer between the first substrate and the second substrate;

wherein the second substrate comprises;

a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, and a plurality of pixels in a matrix arrangement, a pixel from the plurality of pixels being defined by two adjacent source lines from the plurality of source lines and two adjacent gate lines from the plurality of gate lines, wherein a pixel electrode formed in the pixel comprises a plurality of slits, the plurality of slits including a first set of slit segments extending in a first direction, and a second set of slit segments extending in a second direction, a first light blocking member for blocking light through the pixel, the first light blocking member extending directly from a first of the two adjacent source lines towards a second of the two adjacent source lines and along a common boundary area of the first set of slit segments and the second set of slit segments, the first light blocking member being spaced apart from the second of the two adjacent source lines in plan-view, and a common electrode opposite to the pixel electrode, wherein the first light blocking member is formed in a different layer than the common electrode and the plurality of gate lines.

2. The liquid crystal display device as claimed in claim 1, wherein the plurality of slits further includes a third set of slit segments extending in a third direction and a fourth set of slit segments extending in a fourth direction, the third set of slit segments and the fourth set of slit segments being formed in the common boundary area.

3. The liquid crystal display device as claimed in claim 2, wherein the first set of slit segments and the second set of slit segments are connected through the third set of slit segments and the fourth set of slit segments.

4. The liquid crystal display device as claimed in claim 2, the first light blocking member entirely overlaps the third set of slit segments and the fourth set of slit segments in plan view.

5. The liquid crystal display device as claimed in claim 1, wherein the second substrate further comprises:

a plurality of common metal lines electrically connecting to the common electrode, wherein the first light blocking member is a part of the plurality of common metal lines.

6. The liquid crystal display device as claimed in claim 1, wherein the plurality of source lines and the first light blocking member are formed in a same layer.

7. The liquid crystal display device as claimed in claim 6, wherein the first light blocking member is integrated with the first of the two adjacent source lines and is electrically isolated from the second of the two adjacent source lines.

8. The liquid crystal display device as claimed in claim 6, wherein the first light blocking member is electrically isolated from the two adjacent source lines.

9. The liquid crystal display device as claimed in claim 1, wherein the second substrate further comprises a second light blocking member for blocking light through the pixel, the second light blocking member overlapping edge portions of the plurality of slits, and being made of a metal.

10. The liquid crystal display device as claimed in claim 9, wherein the edge portions of the plurality of slits extend in a fifth direction different from the first direction and the second direction.

11. The liquid crystal display device as claimed in claim 9, wherein the second substrate comprises:

a plurality of common metal lines electrically connecting to the common electrode, wherein the plurality of common metal lines and the second light blocking member are formed in a same layer.

12. The liquid crystal display device as claimed in claim 9, wherein the plurality of source lines and the second light blocking member are formed in a same layer.

13. The liquid crystal display device as claimed in claim 9, wherein the plurality of gate lines is integrated with the second light blocking member.

14. The liquid crystal display device as claimed in claim 13, wherein at least a part of the second light blocking member is exposed from the black matrix in plan view.

15. The liquid crystal display device as claimed in claim 1, wherein the first light blocking member is formed on the common electrode.

16. A liquid crystal display device comprising:

a first substrate including a black matrix;

a second substrate opposite to the first substrate; and

a liquid crystal layer between the first substrate and the second substrate;

wherein the second substrate comprises;

a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, and a plurality of pixels in a matrix arrangement, a pixel from the plurality of pixels being defined by two adjacent source lines from the plurality of source lines and two adjacent gate lines from the plurality of gate lines, wherein a pixel electrode formed in the pixel comprises a plurality of slits, a slit-edge light blocking member overlapping an edge portion of each of the plurality of slits in plan-view, the slit-edge light blocking member extending directly from a first of the two adjacent source lines towards a second of the two adjacent source lines, the slit-edge light blocking member being spaced apart from the second of the two adjacent source lines in plan-view, and the slit-edge light blocking member being made of a metal, and a common electrode opposite to the pixel electrode, the slit-edge light blocking member being formed in a different layer than the common electrode and the plurality of gate lines.

17. The liquid crystal display device as claimed in claim 16, wherein each of the plurality of slits includes a main portion, the main portion continuously connecting with the edge portion, and wherein the main portion extends in a direction different from an extending direction of the edge portion in each of the plurality of slits.

18. The liquid crystal display device as claimed in claim 16, wherein the second substrate further comprises:

a plurality of common metal lines electrically connecting to the common electrode, wherein the plurality of common metal lines and the slit-edge light blocking member are formed in a same layer.

19. The liquid crystal display device as claimed in claim 16, wherein the plurality of source lines and the slit-edge light blocking member are formed in a same layer.

20. The liquid crystal display device as claimed in claim 16, wherein the plurality of gate lines and the slit-edge light blocking member are formed in a same layer, and wherein the slit-edge light blocking member is integrated with one of the plurality of gate lines.

21. The liquid crystal display device as claimed in claim 20, wherein at least a part of the slit-edge light blocking member is exposed from the black matrix in plan view.