Methods and apparatus for controlling touchscreen interference

• US 9,793,748 B2
• Filed: 08/31/2015
• Issued: 10/17/2017
• Est. Priority Date: 08/31/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Von Novak, III, William Henry, Wheeland, Cody Burton, Antar, Michael
• Primary Examiner(s): LIN, SUN J
• Application Number:
  US14/841,457
• Publication Number:
  US 20170063145A1
• Time in Patent Office: 778 Days
• Field of Search: 320108
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits

Abstract

This application describes methods and apparatus for controlling touchscreen interferences. In one aspect, a wireless power device for receiving charging power via a wireless charging field of a wireless charging device is provided. The wireless power device comprises a sensor circuit configured to detect at least one signal from a touchscreen, the detected at least one signal indicating an interaction with the touchscreen. The wireless power device further comprises a processor circuit configured to determine whether the detected at least one signal is a result of a false contact with the touchscreen resulting from the wireless charging field. The wireless power device further comprises a transmitter circuit configured to transmit, based on determining that the detected at least one signal is a result of the false contact with the touchscreen, a first message to the wireless charging device to lower a strength of the wireless charging field.

Claims

1. A wireless power device for receiving charging power via a wireless charging field of a wireless charging device, the wireless power device comprising:

a sensor circuit configured to detect at least one signal from a touchscreen, the detected at least one signal indicating an interaction with the touchscreen;

a processor circuit configured to determine whether the detected at least one signal is a result of a false contact with the touchscreen resulting from the wireless charging field; and

a transmitter circuit configured to transmit, based on determining that the detected at least one signal is a result of the false contact with the touchscreen, a first message to the wireless charging device to lower a strength of the wireless charging field.

2. The wireless power device of claim 1, wherein the processor circuit is further configured to determine that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined distance from each other.

3. The wireless power device of claim 1, wherein the processor circuit is further configured to determine that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined area.

4. The wireless power device of claim 1, wherein the processor circuit is further configured to determine that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a continuous contact that exceeds a threshold duration occurring on the touchscreen.

5. The wireless power device of claim 1, wherein:

the sensor circuit is further configured to measure a noise level of the touchscreen, and wherein

the processor circuit is further configured to determine whether the measured noise level exceeds a threshold.

6. The wireless power device of claim 5, wherein the transmitter circuit is further configured to transmit, based on whether the measured noise level exceeds the threshold, a second message to the wireless charging device to lower the strength of the wireless charging field.

7. The wireless power device of claim 1, wherein:

the processor circuit is further configured to estimate the strength of the wireless charging field, and wherein

the transmitter circuit is further configured to transmit, based on the estimated strength of the wireless charging field, a second message to the wireless charging device to lower the strength of the wireless charging field to a threshold level.

8. The wireless power device of claim 7, wherein the processor circuit is further configured to estimate the strength of the wireless charging field based at least in part on one or more of:

a voltage level received by a wireless power receiver,

a type of transmitter within the wireless charging device, and

a power drawn by the wireless power receiver.

9. The wireless power device of claim 1, wherein:

the sensor circuit is further configured to detect a change in a characteristic of the wireless charging field indicative of another wireless power device entering the wireless charging field, wherein

the processor circuit is further configured to estimate the strength of the wireless charging field, and wherein

the transmitter circuit is further configured to transmit, based on the estimated strength of the wireless charging field, a second message to the wireless charging device to increase the strength of the wireless charging field.

10. A method for receiving charging power via a wireless charging field of a wireless charging device, the method comprising:

detecting at least one signal from a touchscreen, the detected at least one signal indicating an interaction with the touchscreen;

determining whether the detected at least one signal is a result of a false contact with the touchscreen resulting from the wireless charging field; and

transmitting, based on determining that the detected at least one signal is a result of the false contact with the touchscreen, a first message to the wireless charging device to lower a strength of the wireless charging field.

11. The method of claim 10, further comprising:

determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined distance from each other.

12. The method of claim 10, further comprising:

determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined area.

13. The method of claim 10, further comprising:

determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a continuous contact that exceeds a threshold duration occurring on the touchscreen.

14. The method of claim 10, further comprising:

measuring a noise level of the touchscreen; and

determining whether the measured noise level exceeds a threshold.

15. The method of claim 14, further comprising:

transmitting, based on whether the measured noise level exceeds the threshold, a second message to the wireless charging device to lower the strength of the wireless charging field.

16. The method of claim 10, further comprising:

estimating the strength of the wireless charging field; and

transmitting, based on the estimated strength of the wireless charging field, a second message to the wireless charging device to lower the strength of the wireless charging field to a threshold level.

17. The method of claim 16, further comprising:

estimating the strength of the wireless charging field based at least in part on one or more of;

a voltage level received by a wireless power receiver,

a type of transmitter within the wireless charging device, and

a power drawn by the wireless power receiver.

18. The method of claim 10, further comprising:

detecting a change in a characteristic of the wireless charging field indicative of another wireless power device entering the wireless charging field;

estimating the strength of the wireless charging field; and

transmitting, based on the estimated strength of the wireless charging field, a second message to the wireless charging device to increase the strength of the wireless charging field.

19. A wireless power device for receiving charging power via a wireless charging field of a wireless charging device, the wireless power device comprising:

means for detecting at least one signal from a touchscreen, the detected at least one signal indicating an interaction with the touchscreen;

means for determining whether the detected at least one signal is a result of a false contact with the touchscreen resulting from the wireless charging field; and

means for transmitting, based on determining that the detected at least one signal is a result of the false contact with the touchscreen, a first message to the wireless charging device to lower a strength of the wireless charging field.

20. The wireless power device of claim 19, further comprising:

means for determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined distance from each other.

21. The wireless power device of claim 19, further comprising:

means for determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined area.

22. The wireless power device of claim 19, further comprising:

means for determining that the detected at least one signal is indicative of a continuous contact that exceeds a threshold duration occurring on the touchscreen.

23. The wireless power device of claim 19, further comprising:

means for measuring a noise level of the touchscreen; and

means for determining whether the measured noise level exceeds a threshold.

24. The wireless power device of claim 19, further comprising:

means for estimating the strength of the wireless charging field; and

means for transmitting, based on the estimated strength of the wireless charging field, a second message to the wireless charging device to lower the strength of the wireless charging field to a threshold level.

25. A non-transitory computer-readable medium comprising code that, when executed by a processor, causes the processor to perform a method for receiving charging power via a wireless charging field of a wireless charging device, the method comprising:

detecting at least one signal from a touchscreen, the detected at least one signal indicating an interaction with the touchscreen;

determining whether the detected at least one signal is a result of a false contact with the touchscreen resulting from the wireless charging field; and

transmitting, based on determining that the detected at least one signal is a result of the false contact with the touchscreen, a first message to the wireless charging device to lower a strength of the wireless charging field.

26. The non-transitory computer-readable medium of claim 25, wherein the method further comprises:

determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined distance from each other.

27. The non-transitory computer-readable medium of claim 25, wherein the method further comprises:

determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a series of successive contacts occurring on the touchscreen within a predetermined area.

28. The non-transitory computer-readable medium of claim 25, wherein the method further comprises:

determining that the detected at least one signal is the result of the false contact in response to determining that the detected at least one signal is indicative of a continuous contact that exceeds a threshold duration occurring on the touchscreen.

29. The non-transitory computer-readable medium of claim 25, wherein the method further comprises:

measuring a noise level of the touchscreen; and

determining whether the measured noise level exceeds a threshold.

30. The non-transitory computer-readable medium of claim 25, wherein the method further comprises:

estimating the strength of the wireless charging field; and

transmitting, based on the estimated strength of the wireless charging field, a second message to the wireless charging device to lower the strength of the wireless charging field to a threshold level.