Unintentional Touch Rejection

• US 20130044070A1
• Filed: 10/22/2012
• Published: 02/21/2013
• Est. Priority Date: 12/30/2005
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Townsend, Reed L., Kolmykov-Zotov, Alexander J., Dodge, Steven P., Scott, Bryan D.
• Granted Patent: US 8,659,570 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/0381 Multimodal input, i.e. interface arrangements enabling the user to issue commands by simultaneous use of input devices of different nature, e.g. voice plus gesture on digitizer
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/038 Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0414 using force sensing means to determine a position
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A method for rejecting an unintentional palm touch is disclosed. In at least some embodiments, a touch is detected by a touch-sensitive surface associated with a display. Characteristics of the touch may be used to generate a set of parameters related to the touch. In an embodiment, firmware is used to determine a reliability value for the touch. The reliability value and the location of the touch is provided to a software module. The software module uses the reliability value and an activity context to determine a confidence level of the touch. In an embodiment, the confidence level may include an evaluation of changes in the reliability value over time. If the confidence level for the touch is too low, it may be rejected.

Claims

1. A method comprising:

receiving a touch on a touch-sensitive device;

determining whether the touch exceeds a confidence level;

in response to determining that the touch does not meet the confidence level, determining if the touch exceeds a threshold level; and

in response to determining that the touch exceeds the threshold level, providing a visual feedback on a graphical user interface (GUI).

2. The method of claim 1, wherein the receiving comprises:

detecting the touch on an area of the touch-sensitive device; and

generating a set of parameters characterizing the touch.

3. The method of claim 2, wherein the set of parameters comprises at least one of:

an area of the touch, a shape of the touch, an area bounded by the touch, a location of the touch, or a number of points of contact in the touch, a velocity of the touch, a rate of change in area of the touch, and a rate of change in shape of the touch.

4. The method of claim 1, wherein the visual feedback includes moving a GUI indicator to a location where the touch is located.

5. The method of claim 1, wherein the GUI indicator is a cursor or a widget.

6. The method of claim 1, wherein the confidence level of the touch is based at least in part on a reliability value and an activity context.

7. The method of claim 6, wherein the touch-sensitive device is a touch-sensitive display.

8. The method of claim 7, wherein the activity context includes at least one of:

a determination of whether the location of the touch is in a window associated with an application, a determination of an active application, a determination of a state of the application, a determination of an active region in the window, a determination of whether multiple inputs are being provided, a determination of whether the multiple inputs are expected to be provided substantially simultaneously, a determination of whether a profile of the touch matches a known gesture, or a determination of whether another valid touch is being made in a different location on the touch-sensitive display.

9. The method of claim 1, further comprising in response to determining that the touch fails to meet the threshold level, rejecting the touch as being an inadvertent contact.

10. A computer readable storage medium including computer executable instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

receiving a touch input from a touch-sensitive display;

determining a confidence level associated with the touch input;

determining a predetermined level associated with the confidence level;

determining a threshold level associated with the confidence level; and

providing a visual feedback on a graphical user interface (GUI) in response to determining that the confidence level is between the predetermined level and the threshold level.

11. The computer readable medium of claim 10, wherein the touch input comprises a location of a touch on the touch-sensitive display.

12. The computer readable medium of claim 11, wherein the operations further comprise determining a reliability value and an activity context for the touch.

13. The computer readable medium of claim 12, wherein the operations further comprise determining the confidence level for the touch based at least in part on the reliability value and the activity context.

14. The computer readable medium of claim 12, wherein the activity context includes at least one of:

a determination of whether the location of the touch is in a window associated with an application, a determination of an active application, a determination of a state of the application, a determination of an active region in the window, a determination of whether multiple inputs are being provided, a determination of whether the multiple inputs are expected to be provide substantially simultaneously, a determination of whether a profile of the touch matches a known gesture, or a determination of whether another valid touch is being made in a different location on the touch-sensitive display.

15. The computer readable medium of claim 11, wherein the visual feedback includes moving a GUI indicator to a location where the touch is located.

16. The computer readable medium of claim 15, wherein the GUI indicator is a cursor or a widget.

17. The computer readable medium of claim 10, wherein the operations further comprise:

transmitting the touch input in response to determining that the confidence level exceeds the predetermined level; and

rejecting the touch input in response to determining that the confidence level is below the threshold level.

18. A display device comprising:

a touch sensitive display to receive a touch input; and

a device driver to process the touch input to determine a confidence level, wherein a visual feedback is provided on a graphical user interface (GUI) in response to determining that the confidence level is between a predetermined level and a threshold level.

19. The display device of claim 18, wherein the visual feedback corresponds to moving a GUI indicator to a location where the touch input is located.

20. The display device of claim 18, wherein the GUI indicator is a cursor or a widget.