PORTABLE ELECTRONIC DEVICE INCLUDING TOUCH-SENSITIVE DISPLAY AND METHOD OF CONTROLLING SAME

• US 20110084932A1
• Filed: 10/13/2009
• Published: 04/14/2011
• Est. Priority Date: 10/13/2009
• Status: Abandoned Application

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: SIMMONS, Sean Bartholomew, ALMALKI, Nazih
• Application Number:
  US12/578,025
• Publication Number:
  US 20110084932A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment

Abstract

A method includes receiving signals from force-sensing resistors, detecting a touch on a touch-sensitive display and determining a location of the touch, receiving, from force-sensing resistors, signals related to the touch, and calibrating the force-sensing resistors by adjusting the gain for a first force-sensing resistor, of the force-sensing resistors, based on at least the signals and the location of the touch.

Claims

1. A method comprising:

detecting a touch on a touch-sensitive display and determining a location of the touch;

receiving, from force-sensing resistors, signals related to the touch;

calibrating the force-sensing resistors by adjusting the gain for a first force-sensing resistor of the force-sensing resistors, based on at least the signals and the location of the touch.

2. The method according to claim 1, wherein calibrating comprises calibrating the force-sensing resistors by adjusting the gain for first force-sensing resistor based on at least the signals, the location of the touch, and an offset for the first force-sensing resistor.

3. The method according to claim 1, wherein the offset is determined based on a rate of change of the offset.

4. The method according to claim 3, wherein the rate of change of the offset differs for an increase in the offset and for a decrease in the offset.

5. The method according to claim 1, wherein the gain is determined based on a rate of change of the gain.

6. The method according to claim 2, wherein determining the gain for the force-sensing resistor comprises, determining a value by multiplying a sum of resistance values from the force-sensing resistors by a force distribution vector, determined based on the location of touch and locations of the force-sensing resistors, and dividing by a difference between a resistance for the force-sensing resistor and the offset for the force-sensing resistor.

7. The method according to claim 6, wherein determining the gain comprises determining the gain based on a previously determined gain, the value and a rate of change of gain.

8. The method according to claim 1, comprising determining if the location of touch is within an area on the touch-sensitive display and wherein calibrating is carried out when the touch is located within the area.

9. The method according to claim 8, wherein determining if the location of touch is within an area comprises determining when the location of touch is within a rectangular area, corners of the rectangle located at the force-sensing resistors.

10. The method according to claim 1, comprising determining if the signals are below a threshold and wherein calibrating is carried out when the signals are below the threshold.

11. The method according to claim 1, wherein detecting the touch comprises detecting a single touch on the touch-sensitive display.

12. The method according to claim 1, comprising calibrating an offset when a touch is not detected.

13. The method according to claim 1, wherein calibrating comprises adjusting the gain for each additional one of the force-sensing resistors, based on at least the signals and the location of the touch.

14. The method according to claim 1, wherein calibrating comprises adjusting the gain for each additional one of the force-sensing resistors based on at least the signals, the location of the touch, and an offset for the first force-sensing resistor.

15. The method according to claim 14, comprising determining a respective force at the force-sensing resistors based on respective gains and offsets.

16. A computer-readable medium having computer-readable code executable by at least one processor of a portable electronic device to perform the method according to claim 1.

17. An electronic device comprising:

a touch-sensitive display;

a plurality of force-sensing resistors;

a processor, operably coupled to the touch-sensitive display and to the force-sensing resistors, to determine a location of a touch on the touch-sensitive display, receive, from force-sensing resistors, signals related to the touch, and calibrate the force-sensing resistors by adjusting the gain for a first force-sensing resistor of the force-sensing resistors, based on at least the signals and the location of the touch.