Liquid crystal display device and method of manufacturing thereof

• US 8,300,029 B2
• Filed: 01/05/2012
• Issued: 10/30/2012
• Est. Priority Date: 09/12/2008
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Deuk Su, Song, In Hyuk, Park, Hyung Seok
• Primary Examiner(s): Edun, Muhammad N
• Application Number:
  US13/344,360
• Publication Number:
  US 20120105350A1
• Time in Patent Office: 299 Days
• Field of Search: None
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A liquid crystal display device includes: a liquid crystal panel including first and second substrates facing each other and a liquid crystal layer between the first and second substrates, each of the first and second substrates defining a central display region and a peripheral non-display regions; a cover glass integrated touch sensor on the liquid crystal panel, the touch sensor including a plurality of transparent first electrodes and second electrodes formed on a surface of the cover glass facing the liquid crystal panel, wherein the first electrodes and second electrodes cross each other; and a touch signal applicator at a side of the cover glass away from the display region of the liquid crystal panel.

Claims

1. A display device comprising:

a display element including a central display region and a peripheral non-display region;

a substrate integrated with a touch sensor, the touch sensor including a plurality of transparent first electrodes and second electrodes, at least one of the first electrodes and the second electrodes formed on a surface of the substrate, wherein the first electrodes and the second electrodes cross each other; and

a touch signal applicator at a side of the substrate away from the display region of the display element,

wherein the substrate protrudes from the display element, and the touch signal applicator is on a region of the substrate protruding from the display element.

2. The display device according to claim 1, wherein the display element and the substrate are attached to each other using an adhesive layer.

3. The display device according to claim 1, wherein the region of the substrate protruding from the display element includes a plurality of pads electrically connected to the respective first and second electrodes.

4. The display device according to claim 3, wherein the plurality of pads are also electrically connected to the touch signal applicator that is made of a soft Flexible Printed Cable (FPC).

5. The display device according to claim 3, wherein the first electrodes have an island shape and the second electrodes have a bar shape.

6. The display device according to claim 5, wherein the first electrodes and the second electrodes are arranged in the same layer.

7. The display device according to claim 6, wherein the first electrodes in a row or column direction are electrically connected to each other through a signal applying line and a plurality of contact holes in the insulating layer.

8. The display device according to claim 7, wherein the signal applying line is electrically connected to one of the pads through a pad contact hole.

9. The display device according to claim 7, wherein the signal applying line is made of a metal and is arranged at a location corresponding to a black matrix of the display element.

10. The display device according to claim 6, wherein the insulating layer has a thickness in a range of about 0.1 to about 5 μ

m.

11. The display device according to claim 6, wherein the insulating layer is formed of photo-acryl, Benzo Cyclo Butene (BCB), a gate dielectric film, or nitride film.

12. The display device according to claim 5, wherein the first electrodes and second electrodes includes any one of Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO) and Indium Tin Zinc Oxide (ITZO).

13. The display device according to claim 5, further comprising an insulating layer on the first and second electrodes.

14. The display device according to claim 5, further comprising an insulating layer below the first and second electrodes.

15. The display device according to claim 14, wherein the first electrodes in a row or column direction are electrically connected to each other through a signal applying line and a plurality of contact holes in the insulating layer.

16. The display device according to claim 5, wherein each of the second electrodes has a diamond shape.

17. The display device according to claim 5, wherein the second electrodes in a row or column direction are continuously connected to one another.

18. The display device according to claim 3, wherein voltages are sequentially applied to the first electrodes on a row or column basis.

19. The display device according to claim 1, wherein at least one of the first electrodes and second electrodes are reduced in width where the first electrodes and the second electrodes cross each other.

20. The display device according to claim 19, wherein the first electrodes and the second electrodes have substantially the same area with a diamond shape.

21. The display device according to claim 1, further comprising an image signal applicator electrically connected to the display element.

22. The display device according to claim 21, wherein the touch signal applicator and the image signal applicator are disposed at opposite sides of the display device.

23. The display device according to claim 21, wherein the touch signal applicator and the image signal applicator are disposed at two different sides of the display device.

24. The display device according to claim 21, wherein the touch signal applicator and the image signal applicator are disposed at the same side of the display device.

25. The display device according to claim 24, wherein lines of the touch signal applicator and lines of the image signal applicator are located at opposite surfaces.

26. The display device according to claim 1, wherein the first electrodes and the second electrodes have a bar shape.