Touch panel and method of manufacturing the same

• US 7,696,987 B2
• Filed: 03/04/2005
• Issued: 04/13/2010
• Est. Priority Date: 03/04/2005
• Status: Active Grant

• Current Assignee: Smart Technologies ULC (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Smart Technologies ULC (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Popovich, David Gregory
• Primary Examiner(s): Awad; Amr
• Assistant Examiner(s): Sherman; Stephen G
• Application Number:
  US11/071,452
• Publication Number:
  US 20060197749A1
• Time in Patent Office: 1,866 Days
• Field of Search: 345/173, 345/179, 178 1801- 1809, 178 1901- 1906
• US Class Current: 345/179
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch panel includes an input registration structure comprising a biasable medium layer. A generally inflexible cover is disposed on the input registration structure and defines a touch surface. A pointer biases the biasable medium layer at a position adjacent the pointer when the pointer is positioned proximate the touch surface. The input registration structure generates a position signal corresponding to the position of the pointer in relation to the touch surface.

Claims

1. A touch panel system, comprising a touch panel and at least one magnetic pointer, said touch panel comprising:

an input registration structure comprising a generally planar, unitary flexible layer;

a generally inflexible cover disposed on said input registration structure and defining a touch surface; and

a display panel intermediate said generally inflexible cover and said input registration structure;

wherein when said pointer is positioned proximate said touch surface, said pointer magnetically attracts said flexible layer adjacent said pointer causing only a portion of said flexible layer adjacent said pointer to flex towards said pointer out of plane, flexing of said flexible layer portion towards said pointer causing said input registration structure to generate a position signal corresponding to said pointer position that is transmitted to a computing device.

2. The touch panel system of claim 1, wherein said input registration structure further comprises a pressure-sensitive layer arrangement adjacent said flexible layer, said pressure-sensitive layer arrangement sensing flexing of said flexible layer portion.

3. The touch panel system of claim 2, wherein said pressure-sensitive layer arrangement includes two spaced, conductive resist layers, said resist layers being brought into contact upon flexing of said flexible layer portion.

4. The touch panel system of claim 2, wherein said pressure-sensitive layer arrangement is positioned between said cover and said flexible layer.

5. The touch panel system of claim 4, wherein said flexible layer is ferromagnetic.

6. The touch panel system of claim 5, wherein said flexible layer comprises a layer of ferrous paint applied to a flexible substrate.

7. The touch panel system of claim 6, wherein said layer of ferrous paint is discontinuous across said substrate.

8. The touch panel system of claim 7, wherein said layer of ferrous paint is applied to said substrate in a repeating pattern.

9. The touch panel system of claim 6, wherein said flexible layer is disposed on a support panel.

10. The touch panel system of claim 2, wherein said pointer comprises a permanent magnet.

11. The touch panel system of claim 2, wherein said pointer comprises an electromagnet.

12. The touch panel system of claim 11, wherein said pointer comprises a circuit that, when closed, activates said electromagnet.

13. The touch panel system of claim 1, wherein said pointer comprises a tip switch.

14. The touch panel system of claim 13, wherein said touch panel is conditioned to a touch mode when said tip switch is activated.

15. The touch panel system of claim 14, wherein said touch panel is conditioned to a hover mode when said tip switch is unactivated.

16. The touch panel system of claim 1, wherein said display panel is a liquid crystal display (LCD) panel.

17. A touch panel, comprising:

an input registration structure comprising a generally planar, unitary flexible layer that flexes out of plane at discrete locations in response to magnetic forces applied to said flexible layer adjacent said discrete locations and a pair of spaced conductive resist layers adjacent said flexible layer, said resist layers being brought into contact upon flexing of said flexible layer;

a generally inflexible cover disposed on said input registration structure, a surface of said cover opposite said input registration structure defining a touch surface on which touch input using a magnetic pointer that applies said magnetic forces to said flexible layer can be made; and

a display panel intermediate said generally inflexible cover and said input registration structure;

wherein flexing of said flexible layer causes said input registration structure to generate a position signal corresponding to said pointer position that is transmitted to a computing device.

18. The touch panel of claim 17, wherein said flexible layer comprises a layer of ferrous paint applied to a flexible substrate.

19. A touch panel system, comprising a touch panel and at least one magnetic pointer, said touch panel comprising:

an input registration structure comprising a biasable layer comprising an array of movable magnetic objects, and a pair of spaced, conductive resist layers;

a generally inflexible cover disposed on said input registration structure and defining a touch surface; and

a display panel intermediate said generally inflexible cover and said input registration structure;

wherein when said pointer is positioned proximate said touch surface, said pointer biases magnetic objects of said biasable layer that are positioned adjacent said pointer thereby causing said biased magnetic objects to move and bring said resist layers into contact with one another, said input registration structure of said touch panel generating a position signal corresponding to said pointer position in response to contact of said resist layers that is transmitted to a computing device.

20. The touch panel system of claim 19, wherein said pointer magnetically attracts the magnetic objects.

21. The touch panel system of claim 20, wherein said magnetic objects are ferromagnetic.

22. The touch panel system of claim 21, wherein said magnetic objects are ball bearings.

23. The touch panel system of claim 20, wherein said biasable layer further comprises a separator for maintaining said magnetic objects in a desired distribution.

24. The touch panel system of claim 23, wherein said separator is a grid separator.

25. The touch panel system of claim 23, wherein said separator is a channel separator.

26. A touch panel, comprising:

an input registration structure comprising a magnetically biasable layer and a pair of spaced, conductive resist layers, said magnetically biasable layer comprising a plurality of distributed movable magnetic objects, said magnetic objects being moveable to bring said resist layers into contact in response to applied magnetic forces to generate a position signal that is transmitted to a computing device;

a display panel disposed on said input registration structure; and

a generally inflexible cover disposed on said display panel, a surface of said cover opposite said display panel defining a touch surface on which touch input using a magnetic pointer that applies said magnetic forces to said magnetic objects can be made.

27. The touch panel of claim 26, wherein said resist layers are intermediate said magnetically biasable layer and said display panel.

28. A touch panel system, comprising a touch panel and at least one magnetic pointer, said touch panel comprising:

an input registration structure comprising a generally planar, unitary pliable layer;

a generally inflexible cover disposed on said input registration structure and defining a touch surface; and

a display panel intermediate said generally inflexible cover and said input registration structure;

wherein when said pointer is positioned proximate said touch surface, said pointer magnetically biases said pliable layer towards said pointer and out plane at a position adjacent said pointer thereby causing deformation of said pliable layer only at said position and resulting in said input registration structure generating a position signal corresponding to said pointer position that is transmitted to a computing device.

29. The touch panel system of claim 28, wherein said input registration structure further comprises a pressure-sensitive layer arrangement adjacent said pliable layer, said pressure-sensitive layer arrangement detecting deformation of said pliable layer.

30. The touch panel system of claim 29, wherein said pressure-sensitive layer arrangement includes two spaced, conductive resist layers, said resist layers being brought into contact upon deformation of said pliable layer.

31. The touch panel system of claim 29, wherein said pressure-sensitive layer arrangement is positioned between said cover and said pliable layer.

32. The touch panel system of claim 31, wherein said pliable layer is ferromagnetic.

33. The touch panel system of claim 32, wherein said pliable layer comprises a layer of ferrous paint applied to a substrate.

34. The touch panel system of claim 33, wherein said layer of ferrous paint is discontinuous across said substrate.

35. The touch panel system of claim 34, wherein said layer of ferrous paint is applied to said substrate in a repeating pattern.

36. The touch panel system of claim 33, wherein said pliable layer is disposed on a support panel.

37. The touch panel system of claim 29, wherein said pointer comprises a permanent magnet.

38. The touch panel system of claim 29, wherein said pointer comprises an electromagnet.

39. The touch panel system of claim 38, wherein said pointer comprises a circuit that, when closed, activates said electromagnet.

40. The touch panel system of claim 28, wherein said pointer comprises a tip switch.

41. The touch panel system of claim 40, wherein said touch panel is conditioned to a touch mode when said tip switch is activated.

42. The touch panel system of claim 41, wherein said touch panel is conditioned to a hover mode when said tip switch is unactivated.

43. The touch panel system of claim 28, wherein said display panel is an LCD panel.