METHOD OF DETECTING FLOATING MODE OF A TOUCH PANEL

• US 20130176280A1
• Filed: 12/18/2012
• Published: 07/11/2013
• Est. Priority Date: 01/06/2012
• Status: Active Grant

• Current Assignee: Elan Microelectronics Corporation
• Original Assignee: Elan Microelectronics Corporation
• Inventors: WU, Chia-Mu, HUNG, Tse-Lun, CHEN, Shun-Yi, HUANG, Jung-Shou
• Granted Patent: US 8,866,778 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A method of detecting floating mode of a touch panel has steps of reading a sensing cluster and presetting a detection window; taking each sensing point of the sensing cluster as a center point of the detection window; after determining that the center point has a negative sensing value qualifying to be generated under a floating mode, further determining a count of the sensing points other than the center point having the sensing values generated under a grounding mode and incrementing an accumulative number by one if the count exceeds a first critical value; keeping incrementing the accumulative number until each sensing point in the sensing cluster has been taken as the center point of the detection window for scanning; and determining if the accumulative number exceeds a second critical value, and if positive, further determining that the current sensing cluster is generated under the floating mode.

Claims

1. A method of detecting floating mode of a touch panel, comprising steps of:

(a) reading a sensing cluster having multiple sensing points and presetting a detection window;

(b) taking each sensing point of the sensing cluster as a center point of the detection window to perform scanning;

(c) after determining that the center point has a negative sensing value qualifying to be generated under a floating mode, further determining a count of other sensing points in the detection window having the sensing values generated under a grounding mode and incrementing an accumulative number by one if the count exceeds a first critical value;

(d) keeping incrementing the accumulative number until all the sensing points in the sensing cluster have been taken as the center point of the detection window for scanning; and

(e) determining if the accumulative number is greater than a second critical value, and if positive, further determining that the current sensing cluster is generated under the floating mode.

2. The method as claimed in claim 1, wherein in step (c), a first floating margin is set up for determining if a sensing value is less than the first floating margin, and if positive, the sensing value is considered as one sensing value generated under the floating mode.

3. The method as claimed in claim 1, wherein in step (c), a first floating margin and a second floating margin being less than the first floating margin are set up for determining if a sensing value falls within the second floating margin and the first floating margin, and if positive, the sensing value is considered as one sensing value generated under the floating mode.

4. The method as claimed in claim 1, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

5. The method as claimed in claim 2, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

6. The method as claimed in claim 3, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

7. The method as claimed in claim 1, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

8. The method as claimed in claim 2, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

9. The method as claimed in claim 3, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

10. The method as claimed in claim 2, wherein the first floating margin is less than a negative noise threshold.

11. The method as claimed in claim 3, wherein the first floating margin is less than a negative noise threshold.

12. The method as claimed in claim 4, wherein the first grounding margin is greater than a positive noise threshold.

13. The method as claimed in claim 5, wherein the first grounding margin is greater than a positive noise threshold.

14. The method as claimed in claim 6, wherein the first grounding margin is greater than a positive noise threshold.

15. The method as claimed in claim 7, wherein the first grounding margin is greater than a positive noise threshold.

16. The method as claimed in claim 8, wherein the first grounding margin is greater than a positive noise threshold.

17. The method as claimed in claim 9, wherein the first grounding margin is greater than a positive noise threshold.

18. The method as claimed in claim 1, wherein the first critical value is not less than two, and the second critical value is not less than two.

19. The method as claimed in claim 2, wherein the first critical value is not less than two, and the second critical value is not less than two.

20. The method as claimed in claim 3, wherein the first critical value is not less than two, and the second critical value is not less than two.

21. The method as claimed in claim 4, wherein the first critical value is not less than two, and the second critical value is not less than two.

22. The method as claimed in claim 5, wherein the first critical value is not less than two, and the second critical value is not less than two.

23. The method as claimed in claim 6, wherein the first critical value is not less than two, and the second critical value is not less than two.

24. The method as claimed in claim 7, wherein the first critical value is not less than two, and the second critical value is not less than two.

25. The method as claimed in claim 8, wherein the first critical value is not less than two, and the second critical value is not less than two.

26. The method as claimed in claim 9, wherein the first critical value is not less than two, and the second critical value is not less than two.

27. A method of detecting floating mode of a touch panel, comprising steps of:

(a) reading a sensing frame and presetting a detection window;

(b) taking each of multiple sensing points selected from the sensing frame as a center point of the detection window to perform scanning;

(c) after determining that the center point has a negative sensing value qualifying to be generated under a floating mode, further determining a count of other sensing points in the detection window having the sensing values generated under a grounding mode and incrementing an accumulative number by one if the count exceeds a first critical value;

(d) keeping incrementing the accumulative number until all the selected sensing points in the sensing frame have been taken as the center point of the detection window for scanning; and

(e) determining if the accumulative number is greater than a second critical value, and if positive, further determining that the selected sensing points of the current sensing frame are generated under the floating mode.

28. The method as claimed in claim 27, wherein

in step (b), each of entire sensing points of the sensing frame is taken as a center point of the detection window for scanning;

and

in step (d), the accumulative number is kept incrementing until entire sensing points in the sensing frame have been taken as the center point of the detection window for scanning.

29. The method as claimed in claim 27, wherein in step (c), a first floating margin is set up for determining if a sensing value is less than the first floating margin, and if positive, the sensing value is considered as one sensing value generated under the floating mode.

30. The method as claimed in claim 28, wherein in step (c), a first floating margin is set up for determining if a sensing value is less than the first floating margin, and if positive, the sensing value is considered as one sensing value generated under the floating mode.

31. The method as claimed in claim 27, wherein in step (c), a first floating margin and a second floating margin being less than the first floating margin are set up for determining if a sensing value falls within the second floating margin and the first floating margin, and if positive, the sensing value is considered as one sensing value generated under the floating mode.

32. The method as claimed in claim 28, wherein in step (c), a first floating margin and a second floating margin being less than the first floating margin are set up for determining if a sensing value falls within the second floating margin and the first floating margin, and if positive, the sensing value is considered as one sensing value generated under the floating mode.

33. The method as claimed in claim 27, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

34. The method as claimed in claim 28, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

35. The method as claimed in claim 29, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

36. The method as claimed in claim 30, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

37. The method as claimed in claim 31, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

38. The method as claimed in claim 32, wherein in step (c), a first grounding margin is set up for determining if a sensing value is greater than the first grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

39. The method as claimed in claim 27, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

40. The method as claimed in claim 28, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

41. The method as claimed in claim 29, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

42. The method as claimed in claim 30, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

43. The method as claimed in claim 31, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

44. The method as claimed in claim 32, wherein in step (c), a first grounding margin and a second grounding margin being greater than the first grounding margin are set up for determining if a sensing value falls within the first grounding margin and the second grounding margin, and if positive, the sensing value is considered as one sensing value generated under the grounding mode.

45. The method as claimed in claim 29, wherein the first floating margin is less than a negative noise threshold.

46. The method as claimed in claim 30, wherein the first floating margin is less than a negative noise threshold.

47. The method as claimed in claim 31, wherein the first floating margin is less than a negative noise threshold.

48. The method as claimed in claim 32, wherein the first floating margin is less than a negative noise threshold.

49. The method as claimed in claim 33, wherein the first grounding margin is greater than a positive noise threshold.

50. The method as claimed in claim 34, wherein the first grounding margin is greater than a positive noise threshold.

51. The method as claimed in claim 39, wherein the first grounding margin is greater than a positive noise threshold.

52. The method as claimed in claim 40, wherein the first grounding margin is greater than a positive noise threshold.

53. The method as claimed in claim 27, wherein the first critical value is not less than two, and the second critical value is not less than two.

54. The method as claimed in claim 28, wherein the first critical value is not less than two, and the second critical value is not less than two.

55. The method as claimed in claim 29, wherein the first critical value is not less than two, and the second critical value is not less than two.

56. The method as claimed in claim 30, wherein the first critical value is not less than two, and the second critical value is not less than two.

57. The method as claimed in claim 31, wherein the first critical value is not less than two, and the second critical value is not less than two.

58. The method as claimed in claim 32, wherein the first critical value is not less than two, and the second critical value is not less than two.

59. The method as claimed in claim 33, wherein the first critical value is not less than two, and the second critical value is not less than two.

60. The method as claimed in claim 34, wherein the first critical value is not less than two, and the second critical value is not less than two.

61. The method as claimed in claim 39, wherein the first critical value is not less than two, and the second critical value is not less than two.

62. The method as claimed in claim 40, wherein the first critical value is not less than two, and the second critical value is not less than two.