System and method for host-augmented touch processing

• US 9,791,959 B2
• Filed: 01/07/2014
• Issued: 10/17/2017
• Est. Priority Date: 01/07/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tilak, Raghukul, Jalil, Suhail, Oliveira, Louis Dominic, Pourbigharaz, Fariborz
• Primary Examiner(s): McLoone, Peter D
• Application Number:
  US14/149,458
• Publication Number:
  US 20150193070A1
• Time in Patent Office: 1,379 Days
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment

Abstract

Systems and methods for host-augmented touch-sensing are disclosed. The energy-efficiency of a touch sensitive device may be improved by dynamically adjusting the scanning sensitivity of the touch sensor based on host-augmented environmental information such as temperature, pressure, position, orientation, humidity, force, or battery charging mode.

Claims

1. A touch-sensitive system for an electronic device, comprising:

a touch-sensitive surface;

an environmental sensor; and

a control module configured to;

determine a charging mode of the electronic device while a battery of the electronic device is charged, the charging mode being a mode by which the battery is charged;

continuously acquire data regarding an environmental condition from the environmental sensor; and

reconfigure a sensing infrastructure of the electronic device by dynamically adjusting a scan rate, a scan region, a position update rate, and a touch sensor excitation signal of the touch sensitive surface based on (i) the sensed changes in the environmental condition and (ii) the charging mode of the electronic device to improve a signal-to-noise ratio of the touch-sensitive system.

2. The system of claim 1, wherein the control module is further configured to:

characterize a frequency of electromagnetic noise generated by the charging mode; and

dynamically adjust the scan rate and a touch sensor excitation signal of the touch sensitive surface based on the characterized noise frequency.

3. The system of claim 1, wherein the environmental sensor comprises at least one of one or more capacitive sensors, resistive sensors, pressure sensors, positional sensors, thermal sensors, optical sensors, gyroscopic sensors, electromagnetic sensors, vibration sensors, acoustic sensors, or accelerometers.

4. The system of claim 3, wherein the control module is further configured to suppress a false positive touch event based on a lack of vibration information from the vibration sensor.

5. The system of claim 1, wherein the environmental condition is one of temperature, humidity, orientation of the electronic device, and acceleration.

6. The system of claim 1, wherein the sensing infrastructure comprises an ultrasound sensing infrastructure.

7. The system of claim 1, wherein the control module is further configured to corroborate a weak ground coupling event based on a sensed position of the electronic device and dynamically reconfigure an analog front-end of the electronic device to counteract the weak ground coupling event.

8. The system of claim 1, wherein the charging mode comprises at least one of a trickle-charge mode, a constant-voltage mode, a constant-current mode, and a top-off mode.

9. A method for improving the energy efficiency of a touch-sensing system for an electronic device, comprising:

determining a charging mode of the electronic device while a battery of the electronic device is charged, the charging mode being a mode by which the battery is charged;

sensing one or more environmental conditions with an environmental sensor of the touch-sensing device;

analyzing information provided by the environmental sensor;

corroborating a touch sensing function using the information provided by the environmental sensor; and

reconfigure a sensing infrastructure of the electronic device by dynamically adjusting a scan rate, a scan region, a position update rate, and a touch sensor excitation signal of a touch sensitive surface of the touch-sensing device based on (i) the sensed one or more environmental conditions and (ii) the charging mode of the electronic device to improve a signal-to-noise ratio of the touch-sensing device.

10. The method of claim 9, wherein sensing one or more environmental conditions further comprises sensing at least one of pressure, resistance, temperature, orientation, position, vibration, ambient light, sound, and electromagnetic interference.

11. The method of claim 10 further comprising determining a charging mode of the electronic device;

characterizing a frequency of electromagnetic noise generated by the charging mode; and

adjusting the sensitivity of the touch sensitive surface based on the characterized noise frequency.

12. The method of claim 9, wherein the sensitivity is a scanning sensitivity or a resolution sensitivity.

13. The method of claim 9, wherein sensing the environmental conditions comprising sensing vibration conditions and wherein corroborating the touch sensing conditions comprises corroborating a touch event on the touch sensitive surface with a detected vibration.

14. A non-transitory computer-readable medium comprising instructions that, when executed, causes a processor to perform the method of:

sensing one or more environmental conditions with an environmental sensor of an electronic device;

determining a charging mode of the electronic device while a battery of the electronic device is charged, the charging mode being a mode by which the battery is charged;

characterizing a frequency of electromagnetic noise generated by the charging mode; and

reconfiguring a sensing infrastructure of the electronic device by dynamically adjusting a scan rate, a scan region, a position update rate, and a touch sensor excitation signal of a touch sensitive surface of the electronic device based on (i) the sensed environmental condition and (ii) the characterized electromagnetic noise frequency to improve a signal-to-noise ratio of the electronic device.

15. The non-transitory computer-readable medium of claim 14, wherein the sensitivity is a scanning sensitivity or a resolution sensitivity.

16. The non-transitory computer-readable medium of claim 14, wherein sensing one or more environmental conditions further comprises sensing at least one or more of pressure, resistance, temperature, pressure, orientation, vibration, ambient light, sound, and electromagnetic interference.

17. An apparatus for energy efficient touch processing, comprising:

a touch sensitive surface of an electronic device;

means for determining a charging mode of the apparatus while a battery of the apparatus is charged, the charging mode being a mode by which the battery is charged;

means for sensing one or more environmental conditions of the touch-sensitive surface;

means for analyzing information provided by an environmental sensor;

means for corroborating a touch sensing function using the information provided by the environmental sensor; and

means for reconfiguring a sensing infrastructure of the electronic device by dynamically adjusting a scan rate, a scan region, a position update rate, and a touch sensor excitation signal of the touch sensitive surface based on (i) the sensed one or more environmental conditions and (ii) the charging mode of the electronic device to improve a signal-to-noise ratio of the touch sensitive surface of the electronic device.

18. The apparatus of claim 17 further comprising means for determining a charging mode of the electronic device;

means for characterizing a frequency of electromagnetic noise generated by a charging mode of the electronic device; and

means for dynamically adjusting a scan rate and a sensor excitation signal of the touch sensitive surface based on the characterized electromagnetic noise frequency.

19. The apparatus of claim 17, wherein the sensitivity is a scanning sensitivity or a resolution sensitivity.

20. The apparatus of claim 17, wherein the means for sensing comprises a capacitive sensor, resistive sensor, pressure sensor, positional sensor, thermal sensor, optical sensor, gyroscopic sensor, electromagnetic sensor, vibration sensor, acoustic sensor, or accelerometer.

21. The apparatus of claim 17, wherein the apparatus is a mobile telephone.

22. The apparatus of claim 17, wherein the means for dynamically adjusting the sensitivity of the touch sensitive surface comprises a processor configured to adjust the scan rate of the touch sensitive surface.