TOUCHSCREEN CONTROLLER WITH ADJUSTABLE PARAMETERS

• US 20120249449A1
• Filed: 01/24/2012
• Published: 10/04/2012
• Est. Priority Date: 04/01/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tseng, Ryan, Mudrick, Adam A.
• Granted Patent: US 9,030,421 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Systems, devices, and methods for adjusting characteristics of a touch sensing device in the presence of a wireless power field are disclosed. According to one aspect, the presence of a wireless power field may be detected, and a characteristic of a touch sensing device may be adjusted to reduce interference of the wireless power field with the touch sensing device.

Claims

1. A device comprising:

a touch sensor;

a detector configured to receive information indicative of the presence of a wireless power field; and

a controller configured to adjust at least one characteristic of the touch sensor based at least in part on the received information.

2. The device of claim 1, wherein the touch sensor is configured to sense a touch based on the received information.

3. The device of claim 1, wherein the controller is configured to increase the at least one sensing characteristic.

4. The device of claim 1, wherein the at least one sensing characteristic includes a signal-to-noise ratio.

5. The device of claim 1, wherein the at least one sensing characteristic includes a sensitivity threshold.

6. The device of claim 1, wherein the at least one sensing characteristic includes a driving frequency of the touch sensor.

7. The device of claim 6, wherein the received information includes a frequency of the wireless power field, and wherein the controller is configured to adjust the driving frequency of the touch sensor based on the frequency of the wireless power field.

8. The device of claim 1, wherein the at least one sensing characteristic includes a post-processing method.

9. The device of claim 1, wherein the touch sensor includes a plurality of sensing elements, and wherein the detector is configured to receive the information indicative of the presence of a wireless power field based on a change in at least one of the plurality of sensing elements.

10. The device of claim 1, further comprising a lookup table stored in one or more storage devices coupled to the sensing circuit, wherein the lookup table includes the at least one addressing characteristic and the at least one sensing characteristic.

11. A method of operating a touch sensor, the method comprising:

detecting the presence of a wireless power field; and

adjusting a sensing characteristic of the touch sensor based on the detection.

12. The method of claim 11, wherein adjusting a sensing characteristic comprises increasing a drive strength of a driving waveform.

13. The method of claim 11, wherein adjusting a sensing characteristic comprises increasing a detection threshold.

14. The method of claim 11, wherein adjusting a sensing characteristic includes adjusting a driving frequency of the touch sensor.

15. The method of claim 14, further comprising determining a frequency of the wireless power field;

and adjusting the driving frequency of the touch sensor based on the frequency of the wireless power field.

16. The method of claim 11, wherein the at least one sensing characteristic includes a post-processing method.

17. The method of claim 11, wherein the touch sensor includes a plurality of sensing elements, and wherein detecting the presence of the wireless power field includes detecting based on a change in at least one of the sensing elements.

18. The method of claim 11, wherein adjusting a sensing characteristic includes correlating information regarding the wireless power field with a sensing characteristic based on information in a lookup table.

19. A device for operating a touch sensor, the device comprising:

means for detecting the presence of a wireless power field; and

means for adjusting a sensing characteristic of the touch sensor based on the detection.

20. The device of claim 19, wherein the means for detecting the presence or absence of a wireless power field comprises a detecting circuit, and wherein the means for adjusting a sensing characteristic of the touch sensor comprises a controller.

21. The device of claim 19, wherein the means for adjusting a sensing characteristic includes means for increasing a drive strength of a driving waveform.

22. The device of claim 19, wherein the means for adjusting a sensing characteristic includes means for increasing a detection threshold.

23. The device of claim 19, wherein the means for adjusting a sensing characteristic includes means for adjusting a driving frequency of the touch sensor.

24. The device of claim 23, further comprising means for determining a frequency of the wireless power field;

and means for adjusting the driving frequency of the touch sensor based on the frequency of the wireless power field.

25. The device of claim 19, wherein the at least one sensing characteristic includes a post-processing method.

26. The device of claim 19, wherein the touch sensor includes a plurality of sensing elements, and wherein detecting the presence of the wireless power field includes detecting based on a change in at least one of the sensing elements.

27. The device of claim 19, wherein adjusting a sensing characteristic includes correlating information regarding the wireless power field with a sensing characteristic based on information in a lookup table.

28. A computer program product for processing data for a program configured to operate a touch sensor, the computer program product comprising:

a non-transitory computer-readable medium having stored thereon code for causing processing circuitry to;

detect the presence of a wireless power field; and

adjust a sensing characteristic of the touch sensor based on the detection.

29. The computer program product of claim 28 further comprising code for causing processing circuitry to:

determine a frequency of a wireless power field; and

adjust the driving frequency of the touch sensor based on the determined frequency of the wireless power field.