Liquid crystal display device comprising first and second touch electrodes and method of manufacturing the same

• US 9,495,047 B2
• Filed: 01/22/2014
• Issued: 11/15/2016
• Est. Priority Date: 05/06/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: In, Yun-Kyeong, Kim, Hyun-Young
• Primary Examiner(s): Arendt, Paisley L
• Application Number:
  US14/161,161
• Publication Number:
  US 20140327840A1
• Time in Patent Office: 1,028 Days
• Field of Search: 349/139, 349/141, 349/143
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer disposed between the first and second substrates, a pixel electrode, a common electrode facing the pixel electrode, a plurality of first touch electrodes, and a plurality of second touch electrodes. Each first touch electrode includes a main body portion extending in a first direction and a plurality of branching portions extending from the main body portion in a second direction. The plurality of second touch electrodes cross the main body portion of each first touch electrode.

Claims

1. A liquid crystal display device, comprising:

a first substrate;

a second substrate facing the first substrate;

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

a pixel electrode;

a common electrode facing the pixel electrode;

a plurality of scan lines extending in a first direction;

a plurality of data lines;

a plurality of first touch electrodes, wherein each first touch electrode comprises a main body portion extending in the first direction and overlapping one of the plurality of scan lines, and a plurality of branching portions extending from the main body portion in a second direction, different from the first direction; and

a plurality of second touch electrodes crossing the main body portion of each first touch electrode from among the plurality of first touch electrodes,

wherein each of the plurality of second touch electrodes is disposed between adjacent data lines of the plurality of data lines, and

wherein the plurality of branching portions of each first touch electrode overlap at least one data line from among the plurality of data lines.

2. The liquid crystal display device of claim 1, wherein the plurality of branching portions of each first touch electrode are spaced apart from each other.

3. The liquid crystal display device of claim 1, wherein the plurality of branching portions of one first touch electrode from among the plurality of first touch electrodes are spaced apart from the main body portion of an adjacent first touch electrode.

4. The liquid crystal display device of claim 1, wherein the common electrode is formed on the plurality of first touch electrodes.

5. The liquid crystal display device of claim 1, wherein the common electrode contacts the plurality of first touch electrodes.

6. The liquid crystal display device of claim 1, further comprising:

a plurality of common electrodes,

wherein the common electrode is one of the plurality of common electrodes, and the plurality of common electrodes longitudinally extend and correspond to the plurality of first touch electrodes.

7. The liquid crystal display device of claim 1, further comprising:

a plurality of common electrodes,

wherein the common electrode is one of the plurality of common electrodes, and the plurality of common electrodes are spaced apart from each other.

8. The liquid crystal display device of claim 1, further comprising:

an active layer;

a gate electrode;

a source electrode disposed between the first substrate and the pixel electrode;

a drain electrode disposed between the first substrate and the pixel electrode; and

at least one insulating layer disposed between the pixel electrode and the source and drain electrodes,

wherein the pixel electrode is connected to the source electrode or the drain electrode through a via-hole formed in the at least one insulating layer.

9. The liquid crystal display device of claim 8, further comprising:

a plurality of common electrodes, wherein the common electrode is one of the plurality of common electrodes; and

a plurality of via-holes, wherein the via-hole is one of the plurality of via-holes,

wherein the plurality of common electrodes correspond to the plurality of first touch electrodes, and each common electrode from among the plurality of common electrodes comprises a concave portion corresponding to a via-hole from among the plurality of via-holes.

10. The liquid crystal display device of claim 9, wherein each common electrode from among the plurality of common electrodes does not overlap a corresponding via-hole.

11. The liquid crystal display device of claim 9, wherein each concave portion is formed in one side of a corresponding common electrode from among the plurality of common electrodes.

12. The liquid crystal display device of claim 8, further comprising:

a plurality of via-holes, wherein the via-hole is one of the plurality of via-holes,

wherein the main body portion of each first touch electrode from among the plurality of first touch electrodes comprises a concave portion corresponding to a via-hole from among the plurality of via-holes.

13. The liquid crystal display device of claim 12, wherein each concave portion faces the corresponding via-hole.

14. The liquid crystal display device of claim 12, wherein each concave portion has a width greater than a width of the corresponding via-hole.

15. The liquid crystal display device of claim 1, wherein each first touch electrode from among the plurality of first touch electrodes further comprises a connecting portion connecting two adjacent branching portions from among the plurality of branching portions of each of the plurality of first touch electrodes.

16. The liquid crystal display device of claim 1, further comprising:

a plurality of color filters disposed between the first substrate and the second substrate,

wherein side surfaces of color filters disposed at both sides of each of the plurality of branching portions from among the plurality of color filters contact each other.

17. The liquid crystal display device of claim 1, wherein the plurality of second touch electrodes are formed on the second substrate.

18. The liquid crystal display device of claim 1, wherein the plurality of first touch electrodes are formed of an opaque metal material.

19. A method of manufacturing a liquid crystal display device, comprising:

forming a first substrate;

forming a second substrate that faces the first substrate;

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

forming a pixel electrode;

forming a common electrode that faces the pixel electrode;

forming a plurality of scan lines extending in a first direction;

forming a plurality of data lines;

forming a plurality of first touch electrodes disposed between the first substrate and the second substrate, wherein each first touch electrode comprises a main body portion extending in the first direction and overlapping one of the plurality of scan lines, and a plurality of branching portions extending from the main body portion in a second direction, different from the first direction; and

forming a plurality of second touch electrodes that cross the main body portion of each first touch electrode from among the plurality of first touch electrodes,

wherein each of the plurality of second touch electrodes is disposed between adjacent data lines of the plurality of data lines, and

wherein the plurality of branching portions of each first touch electrode overlap at least one data line from among the plurality of data lines.

20. A liquid crystal display device, comprising:

a first substrate;

a second substrate facing the first substrate;

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

a pixel electrode disposed on the first substrate;

a first touch electrode disposed on the first substrate, wherein the first touch electrode comprises a main body portion extending in a first direction and a plurality of branching portions extending from the main body portion in a second direction, substantially perpendicular to the first direction;

a common electrode disposed on and contacting the first touch electrode;

a second touch electrode disposed on the second substrate and crossing the main body portion of the first touch electrode;

a plurality of scan lines extending in the first direction, wherein the main body portion of the first touch electrode overlaps a scan line from among the plurality of scan lines; and

a plurality of data lines extending in the second direction, wherein each branching portion from among the plurality of branching portions overlaps a data line from among the plurality of data lines,

wherein the second touch electrode is disposed between adjacent data lines of the plurality of data lines.

21. The liquid crystal display device of claim 20, wherein the common electrode comprises a concave portion formed in one side of the common electrode and corresponding to a via-hole, and the common electrode does not overlap the via-hole.

22. The liquid crystal display device of claim 20, wherein the main body portion of the first touch electrode comprises a concave portion corresponding to a via-hole and having a width greater than a width of the via-hole.

23. The liquid crystal display device of claim 20, wherein the first touch electrode further comprises a connecting portion connecting two adjacent branching portions from among the plurality of branching portions of the first touch electrode.