ADAPTIVE TOUCH SCANNING

• US 20150084872A1
• Filed: 09/20/2013
• Published: 03/26/2015
• Est. Priority Date: 09/20/2013
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Alexander Min, Dongho Hong, Kyungtae Han, Mohamed A. Abdelmoneum, Yong-Joon Park
• Inventors: Han, Kyungtae, Min, Alexander, Abdelmoneum, Mohamed A., Hong, Dongho, Park, Yong-Joon
• Granted Patent: US 9,244,551 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• 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

Abstract

An apparatus, touch controller, and system for adaptive touch scanning is described herein. The apparatus includes logic to calculate a distance traveled between two consecutive touch samples, and logic to compare the distance traveled with a target distance to find an actual error. The apparatus also includes logic to update the scan rate based on the actual error.

Claims

1. An apparatus for adaptive touch scanning, comprising:

logic to calculate a distance traveled between two consecutive touch samples;

logic to compare the distance traveled with a target distance to find an actual error; and

logic to update the scan rate based on the actual error.

2. The apparatus of claim 1, wherein the actual error is determined using proportional (P) gain, integral (I) gain, and derivative (D) gain coefficients.

3. The apparatus of claim 2, wherein the proportional (P) gain, integral (I) gain, and derivative (D) gain coefficients are optimized with respect to a touch controller.

4. The apparatus of claim 1, wherein the scan rate is adjusted on the fly based on a speed of touch motion.

5. The apparatus of claim 1, wherein the predefined target distance is a distance between two consecutive touch inputs.

6. The apparatus of claim 1, wherein the scan rate is updated while touch inputs are generated.

7. The apparatus of claim 1, wherein an initial scan rate is 10 milliseconds.

8. A touch controller for adaptive touch scanning, comprising:

a distance estimator;

a comparator; and

a scan interval updater.

9. The touch controller of claim 8, wherein the distance estimator calculates the traveled distance between two consecutive touch samples.

10. The touch controller of claim 8, wherein comparator calculates an actual error.

11. The touch controller of claim 8, wherein the scan interval updater updates a touch scan rate of the touch controller.

12. The touch controller of claim 8, wherein the touch controller is a proportional, integral, and derivative (PID) controller.

13. The touch controller of claim 12, wherein the PID controller is optimized using proportional (P) gain, integral (I) gain, and derivative (D) gain coefficients.

14. The touch controller of claim 8, wherein the scan interval updater maintains a distance traveled between consecutive touch events within a certain range by adjusting a next scan interval.

15. The touch controller of claim 14, wherein the scan interval is increased if the traveled distance is less than a low threshold, and the scan interval is decreased if the traveled distance is larger than a high threshold.

16. A system that performs adaptive touch scanning, comprising:

a display;

a radio;

a memory that is to store instructions and that is communicatively coupled to the display; and

a processor communicatively coupled to the radio and the memory, wherein when the processor is to execute the instructions, the processor is to;

calculate a distance traveled between two consecutive touch samples;

compare the distance traveled with a target distance to find an actual error; and

update the scan rate based on the actual error.

17. The system of claim 16, wherein the actual error is determined using proportional (P) gain, integral (I) gain, and derivative (D) gain coefficients.

18. The system of claim 17, wherein the proportional (P) gain, integral (I) gain, and derivative (D) gain coefficients are optimized with respect to a touch controller.

19. The system of claim 16, wherein the scan rate is adjusted on the fly based on a speed of touch motion.

20. The system of claim 16, wherein the scan rate is updated while touch inputs are generated.