OPTIMIZED ADAPTIVE THRESHOLDING FOR TOUCH SENSING

• US 20140267104A1
• Filed: 03/03/2014
• Published: 09/18/2014
• Est. Priority Date: 03/18/2013
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tilak, Raghukul, Huang, William Y., Rabii, Khosro Mohammad, AHMED, Mohamed Imtiaz, Jalil, Suhail
• Application Number:
  US14/195,491
• Publication Number:
  US 20140267104A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/041661 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

Methods, systems, computer-readable media, and apparatuses for recognizing touch input for a touch panel are presented. In some embodiments, a method for recognizing touch input for a touch panel includes scanning the touch panel over a first frame including at least one touch panel blob resulting from a touch on the touch panel. The method also includes scanning the touch panel over a second frame including at least one touch panel blob resulting from a touch on the touch panel. The method additionally includes processing the touch panel blob within the first frame based at least in part on a first touch-reporting sensitivity and processing the touch panel blob within the second frame based at least in part on a second touch-reporting sensitivity. The method further includes determining whether a valid touch exists based at least in part on the processing step.

Claims

1. A method for recognizing touch input for a touch panel, comprising:

scanning the touch panel over a first frame including at least one touch panel blob resulting from a touch on the touch panel;

scanning the touch panel over a second frame including at least one touch panel blob resulting from a touch on the touch panel;

processing the touch panel blob within the first frame based at least in part on a first touch-reporting sensitivity and processing the touch panel blob within the second frame based at least in part on a second touch-reporting sensitivity; and

determining whether a valid touch exists based at least in part on the processing step.

2. The method of claim 1 further comprising:

scanning the touch panel over a third frame including at least one touch panel blob resulting from a touch on the touch panel;

processing the touch panel blob within the third frame based at least in part on a third touch-reporting sensitivity; and

determining whether a valid touch exists based at least in part on the processing step.

3. The method of claim 2 wherein processing the touch panel blob within the third frame comprises processing the touch panel blob with a false-touch rejection size of less than 2 millimeters and greater than 19 millimeters in diameter.

4. The method of claim 1 further comprising determining a position of the touch panel blob relative to the touch panel based at least in part on the processing step.

5. The method of claim 1 wherein the processing step further comprises adjusting a scan rate of the touch panel.

6. The method of claim 1 wherein the processing step further comprises filtering and interpolating the touch panel blob.

7. The method of claim 1 wherein processing the touch panel blob within the first frame comprises processing the touch panel blob with a false-touch rejection size of less than 19 millimeters in diameter.

8. The method of claim 1 wherein processing the touch panel blob within the second frame comprises processing the touch panel blob with a false-touch rejection size of greater than 2 millimeters in diameter.

9. An apparatus for recognizing touch input for a touch panel, comprising:

the touch panel;

a memory comprising touch positioning logic; and

a processor coupled to the touch panel and the memory, the processor operable, when the touch positioning logic is executed, to;

scan the touch panel over a first frame including at least one touch panel blob resulting from a touch on the touch panel;

scan the touch panel over a second frame including at least one touch panel blob resulting from a touch on the touch panel;

process the touch panel blob within the first frame based at least in part on a first touch-reporting sensitivity and processing the touch panel blob within the second frame based at least in part on a second touch-reporting sensitivity; and

determine whether a valid touch exists based at least in part on the processing step.

10. The apparatus of claim 9 wherein the processor is further operable, when the touch positioning logic is executed, to:

scan the touch panel over a third frame including at least one touch panel blob resulting from a touch on the touch panel;

process the touch panel blob within the third frame based at least in part on a third touch-reporting sensitivity; and

determine whether a valid touch exists based at least in part on the processing step.

11. The apparatus of claim 10 wherein processing the touch panel blob within the first frame comprises processing the touch panel blob with a false-touch rejection size of less than 2 millimeters and greater than 19 millimeters in diameter.

12. The apparatus of claim 9 wherein the processor is further operable, when the touch positioning logic is executed, to determine a position of the touch panel blob relative to the touch panel based at least in part on the processing step.

13. The apparatus of claim 9 wherein the processing step further comprises adjusting a scan rate of the touch panel.

14. The apparatus of claim 9 wherein the processing step further comprises filtering and interpolating the touch panel blob.

15. The apparatus of claim 9 wherein processing the touch panel blob within the first frame comprises processing the touch panel blob with a false-touch rejection size of less than 19 millimeters in diameter.

16. The apparatus of claim 9 wherein processing the touch panel blob within the second frame comprises processing the touch panel blob with a false-touch rejection size of greater than 2 millimeters in diameter.

17. An apparatus for recognizing touch input for a touch panel, comprising:

means for scanning the touch panel over a first frame including at least one touch panel blob resulting from a touch on the touch panel;

means for scanning the touch panel over a second frame including at least one touch panel blob resulting from a touch on the touch panel;

means for processing the touch panel blob within the first frame based at least in part on a first touch-reporting sensitivity and processing the touch panel blob within the second frame based at least in part on a second touch-reporting sensitivity; and

means for determining whether a valid touch exists based at least in part on the processing step.

18. The apparatus of claim 17 further comprising:

means for scanning the touch panel over a third frame including at least one touch panel blob resulting from a touch on the touch panel;

means for processing the touch panel blob within the third frame based at least in part on a third touch-reporting sensitivity; and

means for determining whether a valid touch exists based at least in part on the processing step.

19. The apparatus of claim 18 wherein processing the touch panel blob within the third frame comprises processing the touch panel blob with a false-touch rejection size of less than 2 millimeters and greater than 19 millimeters in diameter.

20. The apparatus of claim 17 further comprising means for determining a position of the touch panel blob relative to the touch panel based at least in part on the processing step.

21. The apparatus of claim 17 wherein the processing step further comprises adjusting a scan rate of the touch panel.

22. The apparatus of claim 17 wherein processing the touch panel blob within the first frame comprises processing the touch panel blob with a false-touch rejection size of less than 19 millimeters in diameter.

23. The apparatus of claim 17 wherein processing the touch panel blob within the second frame comprises processing the touch panel blob with a false-touch rejection size of greater than 2 millimeters in diameter.

24. A processor-readable non-transitory medium comprising processor readable instructions configured to cause a processor to:

scan a touch panel over a first frame including at least one touch panel blob resulting from a touch on the touch panel;

scan the touch panel over a second frame including at least one touch panel blob resulting from a touch on the touch panel;

process the touch panel blob within the first frame based at least in part on a first touch-reporting sensitivity and processing the touch panel blob within the second frame based at least in part on a second touch-reporting sensitivity; and

determine whether a valid touch exists based at least in part on the processing step.

25. The processor-readable non-transitory medium of claim 24 wherein the processor readable instructions are further configured to cause the processor to:

scan the touch panel over a third frame including at least one touch panel blob resulting from a touch on the touch panel;

process the touch panel blob within the third frame based at least in part on a third touch-reporting sensitivity; and

determine whether a valid touch exists based at least in part on the processing step.

26. The processor-readable non-transitory medium of claim 25 wherein processing the touch panel blob within the third frame comprises processing the touch panel blob with a false-touch rejection size of less than 2 millimeters and greater than 19 millimeters in diameter.

27. The processor-readable non-transitory medium of claim 24 wherein the processor readable instructions are further configured to cause the processor to determine a position of the touch panel blob relative to the touch panel based at least in part on the processing step.

28. The processor-readable non-transitory medium of claim 24 wherein the processing step further comprises adjusting a scan rate of the touch panel.

29. The processor-readable non-transitory medium of claim 24 wherein processing the touch panel blob within the first frame comprises processing the touch panel blob with a false-touch rejection size of less than 19 millimeters in diameter.

30. The processor-readable non-transitory medium of claim 24 wherein processing the touch panel blob within the second frame comprises processing the touch panel blob with a false-touch rejection size of greater than 2 millimeters in diameter.