Systems and methods for improved touch screen response

• US 8,797,280 B2
• Filed: 05/26/2010
• Issued: 08/05/2014
• Est. Priority Date: 05/26/2010
• Status: Active Grant

• Current Assignee: Neodrón Limited (Atlantic IP Services Limited)
• Original Assignee: Atmel Corporation (Microchip Technology Incorporated)
• Inventors: Pedzisz, Maciej Sebastian, Simmons, Martin John
• Primary Examiner(s): CERULLO, LILIANA P
• Application Number:
  US12/787,732
• Publication Number:
  US 20110291944A1
• Time in Patent Office: 1,532 Days
• Field of Search: 345173-184, 178 1803- 2004
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04186 Touch location disambiguation

Abstract

This document discloses examples of systems, methods, and articles of manufacture that may provide one or more advantages relating to determining which touch on a touch screen is intended and which touch or touches are inadvertent.

Claims

1. A method, comprising:

sensing touch detections at a touch screen;

comparing the touch detections to a pattern of touch;

grouping, based at least in part on the comparing the touch detections to a pattern of touch detections, the touch detections into at least one detected object;

calculating the size of each detected object, the size of each detected object comprising a number of nodes associated with the detected object;

comparing the size of each detected object to a size threshold, the size threshold comprising a threshold number of nodes, comparing the size of each detected object to the size threshold comprising comparing the number of nodes associated with the detected object to the threshold number of nodes;

reporting the touch detections from each detected object that is less than the size threshold; and

suppressing a response to each detected object greater than the size threshold;

calculating the distance between each of the detected objects;

determining which two detected objects are the furthest from each other;

calculating a ratio of the sizes of the two detected objects furthest from each other; and

suppressing a response to the larger of the two detected objects furthest from each other based at least in part on the ratio.

2. The method of claim 1, further comprising determining that more than one physical object touched the touch screen.

3. The method of claim 2, wherein determining whether more than one physical objects touched the touch screen comprises determining whether touch detections occurred at adjacent nodes within the touch screen.

4. The method of claim 1, wherein calculating the size of each detected object comprises determining the number of adjacent nodes within a touch detection area of the touch screen.

5. The method of claim 1, wherein comparing the size of each detected object to a threshold comprises determining whether the larger of the two detected objects that are further from each other exceeds the threshold.

6. The method of claim 1, further comprising:

calculating a distance between two detected objects;

comparing the distance between the two detected objects to a distance threshold; and

determining that the two detected objects are part of the same detected object when the distance between the two detected objects is less than the distance threshold.

7. The method of claim 1, wherein:

sensing one or more touch detections comprises detecting a change in capacitance at a node exceeds either of a first detection threshold and a second detection threshold;

calculating the size of a detected object comprises determining the number of touch detections that exceed each of the first detection threshold and the second detection threshold;

comparing the size of the each detected object to a size threshold comprises comparing the number of touch detections that exceed the first detection threshold and the number of touch detections that exceed the second detection threshold to a respective size threshold; and

suppressing the response from each detected object greater than the size threshold comprises suppressing the response from the detected object when the number of touch detections that exceed the first detection threshold and the number of touch detections that exceed the second detection threshold exceeds either respective size threshold.

8. A touch panel, comprising:

a control unit having storage device, a drive unit, a sense unit, and a processor;

a storage device that, when operating, stores executable instructions for the processor; and

a touch screen having a plurality of sense nodes arranged in a pattern, wherein the sense nodes are operable to sense a physical object touching the node;

wherein, the instructions configure the processor so that the control unit is operable to perform operations comprising;

sensing touch detections at a touch screen;

comparing the touch detections to a pattern of touch detections;

grouping, based at least in part on the comparing the touch detections to a pattern of touch detections, the touch detections into at least one detected object;

calculating the size of each detected object, the size of each detected object comprising a number of nodes associated with the detected object;

comparing the size of each detected object to a size threshold, the size threshold comprising a threshold number of nodes, comparing the size of each detected object to the size threshold comprising comparing the number of nodes associated with the detected object to the threshold number of nodes;

reporting the touch detections from each detected object that is less than the size threshold; and

suppressing a response to each detected object greater than the size threshold;

calculating the distance between each of the detected objects and determining which two detected objects are the furthest from each other;

calculating a ratio of the sizes of the two detected objects furthest from each other; and

suppressing a response to the larger of the two detected objects furthest from each other based at least in part on the ratio.

9. The touch panel of claim 8, wherein calculating the size of each detected object comprises determining the number of adjacent nodes within a touch detection area of the panel.

10. The touch panel of claim 8, wherein comparing the size of each detected object to a threshold comprises determining whether the larger of the two detected objects that are further from each other exceeds the threshold.

11. The touch panel of claim 8, wherein the operations further comprise determining whether two detected objects are part of the same detected object by comparing a distance between the two detected objects to a distance threshold.

12. A touch sensitive computing device comprising:

a processing unit;

a touch panel, the touch panel having a control unit configured to control the touch panel and report a touch to the processing unit, the control unit having a processor operable to execute instructions that cause the control unit to suppress one or more touch detections associated with a detected object, the instructions causing the processor to perform operations comprising;

sensing touch detections at a touch screen;

comparing the touch detections to a pattern of touch detections;

grouping, based at least in part on the comparing the touch detections to a pattern of touch detections, the touch detections into at least one detected object;

calculating the size of each detected object, the size of each detected object comprising a number of nodes associated with the detected object;

comparing the size of each detected object to a size threshold, the size threshold comprising a threshold number of nodes, comparing the size of each detected object to the size threshold comprising comparing the number of nodes associated with the detected object to the threshold number of nodes;

reporting the touch detections from each detected object that is less than the size threshold; and

suppressing a response to each detected object greater than the size threshold;

calculating the distance between each of the detected objects and determining which two detected objects are the furthest from each other;

calculating a ratio of the sizes of the two detected objects furthest from each other; and

suppressing a response to the larger of the two detected objects furthest from each other based at least in part on the ratio.

13. The touch sensitive computing device of claim 12, wherein calculating the size of each detected object comprises determining the number of adjacent nodes within a touch detection area of the panel.

14. The touch sensitive computing device of claim 12, wherein comparing the size of each detected object to a threshold comprises determining whether the larger of the two detected objects that are further from each other exceeds the threshold.

15. The touch sensitive computing device of claim 12, wherein the operations further comprise determining whether two detected objects are part of the same detected object by comparing a distance between the two detected objects to a distance threshold.

16. An article of manufacture comprising:

a machine readable storage medium; and

executable program instructions embodied in the machine readable storage medium that when executed by a processor of a programmable computing device configures the programmable computing device having a touch panel to perform operations comprising;

sensing touch detections at a touch screen of the touch panel;

comparing the touch detections to a pattern of touch detections;

grouping, based at least in part on the comparing the touch detections to a pattern of touch detections, the touch detections into at least one detected object;

calculating the size of each detected object, the size of each detected object comprising a number of nodes associated with the detected object;

comparing the size of each detected object to a size threshold, the size threshold comprising a threshold number of nodes, comparing the size of each detected object to the size threshold comprising comparing the number of nodes associated with the detected object to the threshold number of nodes;

reporting the touch detections from each detected object that is less than the size threshold; and

suppressing a response to each detected object greater than the threshold;

calculating the distance between each of the detected objects and determining which two detected objects are the furthest from each other;

calculating a ratio of the sizes of the two detected objects furthest from each other; and

suppressing a response to the larger of the two detected objects furthest from each other based at least in part on the ratio.

17. The article of claim 16, wherein calculating the size of each detected object comprises determining the number of adjacent nodes within a touch detection area of the panel.

18. The article of claim 16, wherein comparing the size of each detected object to a size threshold comprises determining whether the larger of the two detected objects that are further from each other exceeds the size threshold.

19. The article of claim 16, wherein the operations further comprise determining whether two detected objects are part of the same detected object by comparing a distance between the two detected objects to a distance threshold.