Method of detecting floating mode of a touch panel

• US 8,866,778 B2
• Filed: 12/18/2012
• Issued: 10/21/2014
• 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
• Primary Examiner(s): CERULLO, LILIANA P
• Application Number:
  US13/718,963
• Publication Number:
  US 20130176280A1
• Time in Patent Office: 672 Days
• Field of Search: 345173-178
• US Class Current: 345/173
• 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;

(c1) determining whether the center point has a negative sensing value less than a first floating margin, when positive, proceeding step (c2)

(c2) determining a count of other sensing points in the detection window having the sensing values greater than a first grounding margin, incrementing an accumulative number by one when the count exceeds a first critical value;

(d) repeating step (c1) until all the sensing points in the sensing cluster have been taken as the center point of the detection window for scanning; and

(e) when the accumulative number is greater than a second critical value, determining the current sensing cluster is generated under a floating mode.

2. The method as claimed in claim 1 further setting up a second floating margin being less than the first floating margin before proceeding step (c1), wherein in step (c1) determining whether a negative sensing value falls within the second floating margin and the first floating margin, and when positive, proceeding step (c2).

3. The method as claimed in claim 1 further setting up a second grounding margin being greater than the first grounding margin, wherein in step (c2) determining a count of other sensing points in the detection window having the sensing values fall within the first grounding margin and the second grounding margin.

4. The method as claimed in claim 2 further setting up a second grounding margin being greater than the first grounding margin, wherein in step (c2) determining a count of other sensing points in the detection window having the sensing values fall within the first grounding margin and the second grounding margin.

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

6. The method as claimed in claim 3, wherein the first grounding margin is greater than a positive noise threshold.

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

8. 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.

9. 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.

10. 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.

11. 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.

12. 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;

(c1) determining whether the center point has a negative sensing value less than a first floating margin, when positive, proceeding step (c2)

(c2) determining a count of other sensing points in the detection window having the sensing values greater than a first grounding margin and incrementing an accumulative number by one when the count exceeds a first critical value;

(d) repeating step (c1) 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) when the accumulative number is greater than a second critical value, determining the selected sensing points of the current sensing frame are generated under a floating mode.

13. The method as claimed in claim 12, 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 step (c1) is kept repeating until entire sensing points in the sensing frame have been taken as the center point of the detection window for scanning.

14. The method as claimed in claim 12 further setting up a second floating margin being less than the first floating margin before proceeding step (c1), wherein in step (c1) determining whether a negative sensing value falls within the second floating margin and the first floating margin, and when positive, proceeding step (c2).

15. The method as claimed in claim 13 further setting up a second floating margin being less than the first floating margin before proceeding step (c1), wherein in step (c1) determining whether a negative sensing value falls within the second floating margin and the first floating margin, and when positive, proceeding step (c2).

16. The method as claimed in claim 12 further setting up a second grounding margin being greater than the first grounding margin, wherein in step (c2) determining a count of other sensing points in the detection window having the sensing values fall within the first grounding margin and the second grounding margin.

17. The method as claimed in claim 13 further setting up a second grounding margin being greater than the first grounding margin, wherein in step (c2) determining a count of other sensing points in the detection window having the sensing values fall within the first grounding margin and the second grounding margin.

18. The method as claimed in claim 14 further setting up a second grounding margin being greater than the first grounding margin, wherein in step (c2) determining a count of other sensing points in the detection window having the sensing values fall within the first grounding margin and the second grounding margin.

19. The method as claimed in claim 15 further setting up a second grounding margin being greater than the first grounding margin, wherein in step (c2) determining a count of other sensing points in the detection window having the sensing values fall within the first grounding margin and the second grounding margin.

20. The method as claimed in claim 14, wherein the first floating margin is less than a negative noise threshold.

21. The method as claimed in claim 15, wherein the first floating margin is less than a negative noise threshold.

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

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

24. The method as claimed in claim 12, 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 13, 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 14, wherein the first critical value is not less than two, and the second critical value is not less than two.

27. The method as claimed in claim 15, wherein the first critical value is not less than two, and the second critical value is not less than two.

28. The method as claimed in claim 16, wherein the first critical value is not less than two, and the second critical value is not less than two.

29. The method as claimed in claim 17, wherein the first critical value is not less than two, and the second critical value is not less than two.