Capacitive sensing device tuning

• US 7,479,788 B2
• Filed: 12/14/2006
• Issued: 01/20/2009
• Est. Priority Date: 12/14/2006
• Status: Expired due to Fees

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: Golovchenko, Mykola, Reynolds, Joseph K., Harvey, Tom, Srinivasan, Umha Mahesh, Tucholski, Adam, Pham, Sean D., Bolender, Robert J.
• Primary Examiner(s): Nguyen; Vincent Q
• Application Number:
  US11/639,626
• Publication Number:
  US 20080147362A1
• Time in Patent Office: 768 Days
• Field of Search: 324/658, 324/76.11
• US Class Current: 324/658
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment

Abstract

In one embodiment, the present invention receives sensitivity data corresponding to a plurality of first sensor channels of a respective plurality of capacitive sensing devices and utilizes the sensitivity data to determine a range of expected variation pertaining to the plurality of first sensor channels. The range of expected variation has an upper and a lower limit. The present embodiment also relates the range of expected variation to a sensitivity value corresponding to one of the plurality of first sensor channels. The present embodiment determines at least one performance characteristic of the one of the plurality of first sensor channels near at least one of the upper limit and the lower limit. In this embodiment, the at least one performance characteristic enables the tuning of the plurality of first sensor channels of the respective plurality of capacitive sensing devices.

Claims

1. A method for enabling the tuning of a capacitive sensing device, said method comprising:

receiving sensitivity data corresponding to a plurality of first sensor channels of a respective plurality of capacitive sensing devices;

receiving a range of expected variation pertaining to said plurality of first sensor channels, said range of expected variation pertaining to said plurality of first sensor channels having an upper limit and a lower limit;

relating said range of expected variation pertaining to said plurality of first sensor channels to a sensitivity value corresponding to one of said plurality of first sensor channels; and

determining at least one performance characteristic of said one of said plurality of first sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels, said at least one performance characteristic enabling the tuning of said plurality of first sensor channels of said respective plurality of capacitive sensing devices.

2. The method as recited in claim 1 wherein said relating said range of expected variation comprises relating said range of expected variation pertaining to said plurality of first sensor channels to a nominal sensitivity value corresponding to said plurality of first sensor channels.

3. The method as recited in claim 1 wherein said relating said range of expected variation comprises relating said range of expected variation pertaining to said plurality of first sensor channels to said sensitivity value corresponding to one of said plurality of first sensor channels based upon sensitivity value variation present in said sensitivity data.

4. The method as recited in claim 1 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises determining at least one performance characteristic of a first sensor channel having an operating value close to a nominal sensitivity value for said plurality of first sensor channels.

5. The method as recited in claim 1 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises determining at least one performance characteristic of a first sensor channel arbitrarily selected from said plurality of first sensor channels.

6. The method as recited in claim 1 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of first sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels by adjusting said sensitivity value of said one of said plurality of first sensor channels.

7. The method as recited in claim 1 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of first sensor channels iteratively at said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels and, provided said at least one performance characteristic is unsatisfactory at either of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels, adjusting an operating value for said one of said plurality of first sensor channels.

8. The method as recited in claim 1 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels further comprises:

utilizing said at least one performance characteristic of said one of said plurality of first sensor channels to tune operating values of remaining ones of said plurality of first sensor channels such that said remaining ones of said plurality of first sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of first sensor channels.

9. A method for enabling the tuning of capacitive sensing devices, said method comprising:

receiving sensitivity data corresponding to a plurality of first sensor channels of a respective plurality of capacitive sensing devices;

utilizing said sensitivity data to determine a nominal sensitivity value and receiving a range of expected variation pertaining to said plurality of first sensor channels, said range of expected variation having an upper limit and a lower limit; and

relating said nominal sensitivity value and said range of expected variation pertaining to said plurality of first channels; and

determining at least one performance characteristic of at least one of said plurality of first sensor channels near at least one of said upper limit and said lower limit of said range of expected variation when said at least one of said plurality of first channels is adjusted to exhibit an operating value approximately the same as said nominal sensitivity value, said at least one performance characteristic enabling the tuning of said plurality of first sensor channels of said respective plurality of capacitive sensing devices.

10. The method as recited in claim 9 wherein said relating said nominal sensitivity value said range of expected variation comprises relating said range of expected variation pertaining to said plurality of first sensor channels to said sensitivity value corresponding to one of said plurality of sensor channels based upon sensitivity value variation present in said sensitivity data.

11. The method as recited in claim 9 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises determining at least one performance characteristic of a first sensor channel arbitrarily selected from said plurality of first sensor channels.

12. The method as recited in claim 9 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of first sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels by adjusting said sensitivity value of said one of said plurality of first sensor channels.

13. The method as recited in claim 9 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels further comprises:

utilizing said at least one performance characteristic of said one of said plurality of first sensor channels to tune operating values of remaining ones of said plurality of first sensor channels such that said remaining ones of said plurality of first sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of first sensor channels.

14. A system for enabling the tuning of a capacitive sensing device, said system comprising:

a sensitivity data receiver configured to receive sensitivity data corresponding to a plurality of first sensor channels of a respective plurality of capacitive sensing devices;

a range of expected variation receiver coupled to said sensitivity data receiver, said range of expected variation receiver configured to receive said range of expected variation pertaining to said plurality of first sensor channels, said range of expected variation having an upper limit and a lower limit;

a value relator coupled to said range of the expected variation receiver, said value relator configured to relate said range of expected variation pertaining to said plurality of first sensor channels to a sensitivity value corresponding to one of said plurality of first sensor channels; and

a performance characteristic determiner coupled to said value relator, said performance characteristic determiner configured to determine at least one performance characteristic of said one of said plurality of first sensor channels near at least one of said upper limit and said lower limit of said range of expected variation, said at least one performance characteristic enabling the tuning of said plurality of first sensor channels of said respective plurality of capacitive sensing devices.

15. The system of claim 14 further comprising:

a nominal sensitivity value determiner coupled to said sensitivity data receiver, said nominal sensitivity value determiner configured to utilize said sensitivity data to determine a nominal sensitivity value for said plurality of first sensor channels.

16. A method for enabling the tuning of a capacitive sensing device having multiple sensor channels, said method comprising:

receiving sensitivity data corresponding to a plurality of first sensor channels of a respective plurality of capacitive sensing devices;

receiving sensitivity data corresponding to a plurality of second sensor channels of said respective plurality of capacitive sensing devices;

receiving sensitivity data corresponding to a plurality of third sensor channels of said respective plurality of capacitive sensing devices;

receiving a range of expected variation pertaining to said plurality of first sensor channels, a range of expected variation pertaining to said plurality of second sensor channels, and a range of expected variation pertaining to said plurality of third sensor channels, wherein said range of expected variation pertaining to said plurality of first sensor channels, said range of expected variation pertaining to said plurality of second sensor channels, and said range of expected variation pertaining to said plurality of third sensor channels, each have an upper limit and a lower limit;

relating said range of expected variation pertaining to said plurality of first sensor channels to a sensitivity value corresponding to one of said plurality of first sensor channels;

determining at least one performance characteristic of said one of said plurality of first sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels, said at least one performance characteristic enabling the tuning of said plurality of first sensor channels of said respective plurality of capacitive sensing devices;

relating said range of expected variation pertaining to said plurality of second sensor channels to a sensitivity value corresponding to one of said plurality of second sensor channels;

determining at least one performance characteristic of said one of said plurality of second sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of second sensor channels, said at least one performance characteristic enabling the tuning of said plurality of second sensor channels of said respective plurality of capacitive sensing devices;

relating said range of expected variation pertaining to said plurality of third sensor channels to a sensitivity value corresponding to one of said plurality of third sensor channels; and

determining at least one performance characteristic of said one of said plurality of third sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of third sensor channels, said at least one performance characteristic enabling the tuning of said plurality of third sensor channels of said respective plurality of capacitive sensing devices.

17. The method as recited in claim 16 wherein said one of said plurality of first sensor channels, said one of said plurality of second sensor channels, and said one of said plurality of third sensor channels reside on the same capacitive sensing device.

18. The method as recited in claim 16 wherein said relating said range of expected variation pertaining to said plurality of first sensor channels comprises relating said range of expected variation pertaining to said plurality of first sensor channels to a nominal sensitivity value corresponding to said plurality of first sensor channels.

19. The method as recited in claim 16 wherein said relating said range of expected variation pertaining to said plurality of first sensor channels comprises relating said range of expected variation pertaining to said plurality of first sensor channels to said sensitivity value corresponding to one of said plurality of first sensor channels based upon sensitivity value variation present in said sensitivity data corresponding to said plurality of first sensor channels.

20. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises determining at least one performance characteristic of a first sensor channel having an operating value close to a nominal sensitivity value for said plurality of first sensor channels.

21. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises determining at least one performance characteristic of a first sensor channel arbitrarily selected from said plurality of first sensor channels.

22. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of first sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels by adjusting said sensitivity value of said one of said plurality of first sensor channels.

23. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of first sensor channels iteratively at said upper limit and said lower limit of said range of expected variation pertaining to said plurality of first sensor channels and, provided said at least one performance characteristic is unsatisfactory at either of said upper limit and said lower limit of said range of expected variation, adjusting an operating value for said one of said plurality of first sensor channels.

24. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels further comprises:

utilizing said at least one performance characteristic of said one of said plurality of first sensor channels to tune operating values of remaining ones of said plurality of first sensor channels such that said remaining ones of said plurality of first sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of first sensor channels.

25. The method as recited in claim 16 wherein said relating said range of expected variation pertaining to said plurality of second sensor channels comprises relating said range of expected variation pertaining to said plurality of second sensor channels to a nominal sensitivity value corresponding to said plurality of second sensor channels.

26. The method as recited in claim 16 wherein said relating said range of expected variation pertaining to said plurality of second sensor channels comprises relating said range of expected variation pertaining to said plurality of second sensor channels to said sensitivity value corresponding to one of said plurality of second sensor channels based upon sensitivity value variation present in said sensitivity data corresponding to said plurality of second sensor channels.

27. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of second sensor channels comprises determining at least one performance characteristic of a second sensor channel having an operating value close to a nominal sensitivity value for said plurality of second sensor channels.

28. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of second sensor channels comprises determining at least one performance characteristic of a second sensor channel arbitrarily selected from said plurality of sensor channels.

29. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of second sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of second sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of second sensor channels by adjusting said sensitivity value of said one of said plurality of second sensor channels.

30. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of second sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of second sensor channels iteratively at said upper limit and said lower limit of said range of expected variation pertaining to said plurality of second sensor channels and, provided said at least one performance characteristic is unsatisfactory at either of said upper limit and said lower limit of said range of expected variation, adjusting an operating value for said one of said plurality of second sensor channels.

31. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of second sensor channels further comprises:

utilizing said at least one performance characteristic of said one of said plurality of second sensor channels to tune operating values of remaining ones of said plurality of second sensor channels such that said remaining ones of said plurality of second sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of second sensor channels.

32. The method as recited in claim 16 wherein said relating said range of expected variation pertaining to said plurality of third sensor channels comprises relating said range of expected variation pertaining to said plurality of third sensor channels to a nominal sensitivity value corresponding to said plurality of third sensor channels.

33. The method as recited in claim 16 wherein said relating said range of expected variation pertaining to said plurality of third sensor channels comprises relating said range of expected variation pertaining to said plurality of third sensor channels to said sensitivity value corresponding to one of said plurality of third sensor channels based upon sensitivity value variation present in said sensitivity data corresponding to said plurality of third sensor channels.

34. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of third sensor channels comprises determining at least one performance characteristic of a third sensor channel having an operating value close to a nominal sensitivity value for said plurality of third sensor channels.

35. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of third sensor channels comprises determining at least one performance characteristic of a third sensor channel arbitrarily selected from said plurality of third sensor channels.

36. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of third sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of third sensor channels near at least one of said upper limit and said lower limit of said range of expected variation pertaining to said plurality of third sensor channels by adjusting said sensitivity value of said one of said plurality of third sensor channels.

37. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of third sensor channels comprises:

determining at least one performance characteristic of said one of said plurality of third sensor channels iteratively at said upper limit and said lower limit of said range of expected variation pertaining to said plurality of third sensor channels and, provided said at least one performance characteristic is unsatisfactory at either of said upper limit and said lower limit of said range of expected variation, adjusting an operating value for said one of said plurality of third sensor channels.

38. The method as recited in claim 16 wherein said determining at least one performance characteristic of said one of said plurality of third sensor channels further comprises:

utilizing said at least one performance characteristic of said one of said plurality of third sensor channels to tune operating values of remaining ones of said plurality of third sensor channels such that said remaining ones of said plurality of third sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of third sensor channels.

39. A method for enabling the tuning of a capacitive sensing device, said method comprising:

receiving sensitivity data corresponding to a plurality of first sensor channels of a respective plurality of capacitive sensing devices;

determining at least one performance characteristic of said one of said plurality of first sensor channels corresponding to said one of said plurality of first sensor channels, near a first performance extreme; and

relating a sensitivity value corresponding to said one of said plurality of first sensor channels to a distribution corresponding to said plurality of first sensor channels and to said at least one performance characteristic, thereby enabling the tuning of said plurality of first sensor channels.

40. The method as recited in claim 39 wherein the determining at least one performance characteristic of said one of said plurality of first sensor channels corresponding to said one of said plurality of first sensor channels includes determining a second performance extreme corresponding to said one of said plurality of first sensor channels.

41. The method as recited in claim 39 wherein said relating a sensitivity value corresponding to said one of said plurality of first sensor channels to a distribution corresponding to said plurality of first sensor channels and to said at least one performance characteristic is based upon sensitivity value variation present in said sensitivity data.

42. The method as recited in claim 39 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises determining at least one performance characteristic of a first sensor channel arbitrarily selected from said plurality of first sensor channels.

43. A method for enabling the tuning of a capacitive sensing device, said method comprising:

receiving sensitivity data corresponding to a plurality of first sensor channels of a respective plurality of capacitive sensing devices;

receiving sensitivity data corresponding to a plurality of second sensor channels of a respective plurality of capacitive sensing devices;

receiving sensitivity data corresponding to a plurality of third sensor channels of a respective plurality of capacitive sensing devices;

determining at least one performance characteristic of said one of said plurality of first sensor channels corresponding to said one of said plurality of first sensor channels, near a first performance extreme corresponding to said one of said plurality of first sensor channels;

determining at least one performance characteristic of said one of said plurality of second sensor channels corresponding to said one of said plurality of second sensor channels, near a first performance extreme corresponding to said one of said plurality of second sensor channels;

determining at least one performance characteristic of said one of said plurality of third sensor channels corresponding to said one of said plurality of third sensor channels, near a first performance extreme corresponding to said one of said plurality of third sensor channels; and

relating a sensitivity value corresponding to said one of said plurality of first sensor channels and to said one of said plurality of second sensor channels and to said one of said plurality of third sensor channels to a distribution corresponding to said one of said plurality of each of the respective sensor channels and to said performance characteristic, thereby enabling the tuning of said plurality of first sensor channels, said plurality of second sensor channels, and said plurality of third sensor channels of said respective plurality of capacitive sensing devices.

44. The method as recited in claim 43 wherein said one of said plurality of first sensor channels, said one of said plurality of second sensor channels, and said one of said plurality of third sensor channels reside on the same capacitive sensing device.

45. The method as recited in claim 43 wherein said determining at least one performance characteristic of said one of said plurality of first sensor channels comprises determining at least one performance characteristic of a first sensor channel arbitrarily selected from said plurality of first sensor channels.

46. The method as recited in claim 43 remaining ones of said plurality of first sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of first sensor channels.

47. The method as recited in claim 43 wherein said determining at least one performance characteristic of said one of said plurality of second sensor channels comprises determining at least one performance characteristic of a second sensor channel arbitrarily selected from said plurality of second sensor channels.

48. The method as recited in claim 43 remaining ones of said plurality of second sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of second sensor channels.

49. The method as recited in claim 43 wherein said determining at least one performance characteristic of said one of said plurality of third sensor channels comprises determining at least one performance characteristic of a third sensor channel arbitrarily selected from said plurality of third sensor channels.

50. The method as recited in claim 43 remaining ones of said plurality of third sensor channels can be tuned without requiring additional testing of said remaining ones of said plurality of third sensor channels.