Digital resistive type touch panel and fabrication method thereof

• US 20050190161A1
• Filed: 10/08/2003
• Published: 09/01/2005
• Est. Priority Date: 12/24/2002
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Hong, Hee Jung, Park, Hee Jeong
• Granted Patent: US 7,355,592 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners
• 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

Abstract

A display device integrated with a touch panel is disclosed, which can use various types of input devices. Thus, in addition to conductive devices, a gloved hand or a non-conductive stylus pen can be used as an input. The touch panel includes a supporting substrate; a first transparent conductive layer having a first electrode for applying a voltage to the supporting substrate; a second transparent conductive layer having a second electrode and facing the first transparent conductive layer; an adhesive for attaching the first and second transparent conductive layers to each other; and a passivation film on an outer surface of the second transparent conductive layer.

Claims

1. A touch panel comprising:

a supporting substrate;

a first transparent conductive layer having a first electrode for applying a voltage to the supporting substrate;

a second transparent conductive layer having a second electrode and facing the first transparent conductive layer;

an adhesive between the first and second transparent conductive layers; and

a passivation film on an outer surface of the second transparent conductive layer.

2. The touch panel of claim 1, further comprising a plurality of dot spacers formed at fixed intervals on the first transparent conductive layer.

3. The touch panel of claim 1, further comprising a transparent conductive layer formed below the supporting substrate.

4. The touch panel of claim 1, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

5. The touch panel of claim 4, wherein the adhesive includes an insulating material.

6. The touch panel of claim 1, wherein the supporting substrate includes a glass.

7. The touch panel of claim 1, wherein the supporting substrate is a transparent film.

8. The touch panel of claim 1, wherein the first electrode is metal and is formed at each of four corners of the first transparent conductive layer.

9. The touch panel of claim 1, wherein the second electrode is metal and is formed at one side of the second transparent conductive layer.

10. The touch panel of claim 1, wherein the passivation film is formed of a transparent plastic material.

11. The touch panel of claim 10, wherein the passivation film is a Polyethylene Terephtalate film.

12. The touch panel of claim 1, further comprising a current sensor connected to the first electrode.

13. The touch panel of claim 1, wherein the second electrode is formed on the inner surface of the second transparent conductive layer and is connected to an external ground voltage or a metal shielding plate.

14. A fabrication method of a touch panel comprising:

providing a supporting substrate;

forming a first transparent conductive layer having a first electrode for applying a voltage to the supporting substrate;

forming a second transparent conductive layer having a second electrode and facing the first transparent conductive layer;

attaching the first and second transparent conductive layers to each other using an adhesive; and

forming a passivation film on an outer surface of the second transparent conductive layer.

15. The method of claim 14, further comprising, forming a plurality of dot spacers at fixed intervals on the first transparent conductive layer.

16. The method of claim 14, further comprising, forming a transparent conductive layer below the supporting substrate.

17. The method of claim 14, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

18. The method of claim 14, wherein the supporting substrate is a glass or a film.

19. The method of claim 14, wherein the first metal electrode is formed at each of four corners of the first transparent conductive layer.

20. The method of claim 14, wherein the passivation film is a Polyethylene Terephtalate film.

21. The method of claim 14, further comprising a current sensor connected to the first electrode.

22. The method of claim 14, wherein the second electrode is formed on the inner surface of the second transparent conductive layer and is connected to an external ground voltage or a metal shielding plate.

23. A liquid crystal display device integrated with a touch panel comprising:

the touch panel comprising;

a supporting substrate having first and second surfaces,

a first transparent conductive layer on the first surface of the supporting substrate, the first transparent conductive layer having a first electrode for applying a voltage to the supporting substrate,

a second transparent conductive layer having a second electrode and facing the first transparent conductive layer,

an adhesive between the first and second transparent conductive layers, and

a passivation film on an outer surface of the second transparent conductive layer; and

the liquid crystal display device on the second surface of the supporting substrate of the touch panel, the liquid crystal display device comprising;

a first substrate having a plurality of thin film transistors,

a second substrate having a color filter and facing the first substrate, and

a liquid crystal layer between the first and second substrates.

24. The device of claim 23, further comprising a plurality of dot spacers formed at fixed intervals on the first transparent conductive layer.

25. The device of claim 23, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

26. The device of claim 25, wherein the adhesive includes an insulating material.

27. The device of claim 23, wherein the supporting substrate includes a glass.

28. The device of claim 23, wherein the first electrode is metal and is formed at each of four corners of the first transparent conductive layer.

29. The device of claim 23, wherein the second electrode is metal and is formed at one side of the second transparent conductive layer.

30. The device of claim 23, wherein the passivation film is formed of a transparent plastic material.

31. The device of claim 30, wherein the passivation film is a Polyethylene Terephtalate film.

32. The device of claim 23, further comprising a current sensor connected to the first electrode.

33. The device of claim 23, wherein the second electrode is formed on the inner surface of the second transparent conductive layer and is connected to an external ground voltage or a metal shielding plate.

34. A method for fabricating a liquid crystal display device integrated with a touch panel comprising:

providing a supporting substrate having first and second surfaces;

forming a first transparent conductive layer on the first surface of the supporting substrate, the first transparent conductive layer having a first electrode for applying a voltage to the supporting substrate;

forming a second transparent conductive layer having a second electrode and facing the first transparent conductive layer;

attaching the first and second transparent conductive layers to each other using an adhesive;

forming a passivation film on an outer surface of the second transparent conductive layer; and

forming the liquid crystal display device on the second surface of the supporting substrate of the touch panel, the method for fabricating the liquid crystal display device comprising;

preparing a first substrate having a plurality of thin film transistors,

preparing a second substrate having a color filter and facing the first substrate, and

providing a liquid crystal layer between the first and second substrates.

35. The method of claim 34, further comprising, forming a plurality of dot spacers at fixed intervals on the first transparent conductive layer.

36. The method of claim 34, further comprising, forming a transparent conductive layer below the supporting substrate.

37. The method of claim 34, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

38. The method of claim 34, wherein supporting substrate is a glass or a film.

39. The method of claim 34, wherein the first metal electrode is formed at each of four corners of the first transparent conductive layer.

40. The method of claim 34, wherein the passivation film is a Polyethylene Terephtalate film.

41. The method of claim 34, further comprising a current sensor connected to the first electrode.

42. The method of claim 34, wherein the second electrode is formed on the inner surface of the second transparent conductive layer and is connected to an external ground voltage or a metal shielding plate.