Preventing unintentional activation of a sensor element of a sensing device

• US 20080196945A1
• Filed: 02/21/2007
• Published: 08/21/2008
• Est. Priority Date: 02/21/2007
• Status: Abandoned Application

• Current Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Original Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Inventors: Konstas, Jason
• Application Number:
  US11/709,897
• Publication Number:
  US 20080196945A1
• Time in Patent Office: Days
• US Class Current: 178/18.03
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/03547 Touch pads, in which fingers can move on a surface
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard

Abstract

An apparatus and method for preventing unintentional activations of one or more sensor elements caused by a conductive object using all the sensor elements, using an additional sensor element, or using recessed sensor elements.

Claims

1. A method, comprising:

detecting a presence of a conductive object on a sensing device having one or more sensor elements; and

preventing unintentional activation of the one or more sensor elements caused by the conductive object using an additional sensor element.

2. The method of claim 1, wherein preventing the unintentional activation comprises:

coupling each of the one or more sensor elements to the additional sensor element;

measuring a capacitance on the one or more sensor elements and the additional sensor element; and

determining whether the capacitance is greater than a rejection threshold.

3. The method of claim 2, wherein preventing the unintentional activation further comprises preventing the unintentional activation of the one or more sensor elements when the capacitance is greater than the rejection threshold.

4. The method of claim 1, wherein preventing the unintentional activation comprises:

measuring a capacitance on the additional sensor element; and

determining whether the capacitance is greater than a rejection threshold.

5. The method of claim 4, wherein preventing the unintentional activation further comprises preventing the unintentional activation of the one or more sensor elements when the capacitance is greater than the rejection threshold.

6. The method of claim 1, wherein the sensing device is a touch panel having a first touch-sensor button and a second touch-sensor button, each touch-sensor button comprising a sensor element, and wherein preventing the unintentional activation comprises:

determining whether a first sensor element of the first touch-sensor button is activated;

determining whether a second sensor element of the second touch-sensor button is activated; and

determining whether the additional sensor element is activated.

7. The method of claim 6, wherein preventing the unintentional activation further comprises:

determining that the one or more sensor elements have been activated when the first and second sensor elements are not activated, regardless of whether the additional sensor element is activated;

determining that the first touch-sensor button has been activated when the first sensor element is activated and the additional sensor element is not activated;

determining that the second touch-sensor button has been activated when the second sensor element is activated and the additional sensor element is not activated;

determining that the first touch-sensor button and the second touch-sensor button have been activated when the first and second sensor elements are activated and the additional sensor element is not activated; and

determining that neither the first or second sensor elements have been activated when the additional sensor element is activated, regardless of whether the first sensor element has been activated and regardless of whether the second sensor element has been activated.

8. An apparatus, comprising:

a first sensor element of a sensing device;

one or more additional sensor elements of the sensing device; and

a processing device coupled to the sensing device, wherein the processing device is configured to prevent unintentional activations of the one or more sensor elements by a conductive object using the first sensor element.

9. The apparatus of claim 8, wherein the processing device is configured to detect a presence of the conductive object on the sensing device.

10. The apparatus of claim 9, wherein the processing device is configured to measure the capacitance on the first sensor element to detect the presence of the conductive object on the sensing device.

11. The apparatus of claim 9, wherein the processing device is configured to couple the first sensor element and the one or more additional sensor elements and to measure the capacitance on the first sensor element and the one or more additional sensor elements to detect the presence of the conductive object.

12. The apparatus of claim 8, wherein the unintentional activations is caused by the conductive object, wherein the conductive object is larger than a finger.

13. The apparatus of claim 12, wherein the conductive object is a disc (DVD or CD).

14. The apparatus of claim 12, wherein the conductive object is a hand.

15. The apparatus of claim 12, wherein the conductive object has a surface area that is approximately four to six times a surface area of one of the one or more additional sensor elements.

16. The apparatus of claim 8, wherein the first sensor element is disposed between the one or more additional sensor elements.

17. The apparatus of claim 8, wherein the first sensor element is disposed to substantially surround the one or more additional sensor elements.

18. The apparatus of claim 12, wherein the first sensor element and the one or more additional sensor elements reside in a control panel.

19. The apparatus of claim 12, wherein the first sensor element and the one or more additional sensor elements reside in a mobile handset.

20. The apparatus of claim 8, wherein the sensing device is a touch panel having a first touch-sensor button and a second touch-sensor button, each touch-sensor button comprising a sensor element of the one or more additional sensor elements, wherein the processing device is configured to determine whether the first touch-sensor button has been activated, whether the second touch-sensor button has been activated, and whether the first sensor element has been activated, and wherein the processing device is configured to reject the activations of either the first or second touch-sensor buttons when the first sensor element has been activated.

21. The apparatus of claim 8, wherein the sensing device is a radial slider having the one or more additional sensor elements disposed in an arc and the first sensor element disposed outside the arc, wherein the processing device is configured to determine whether the one or more additional sensor elements have been activated, and whether the first sensor element has been activated, and wherein the processing device is configured to reject the activations of the one or more sensor element when the first sensor element has been activated.

22. The apparatus of claim 8, wherein the sensing device is a circular slider having the one or more additional sensor elements disposed within a ring of the circular slider and the first sensor element disposed outside the ring, wherein the processing device is configured to determine whether the one or more additional sensor elements have been activated, and whether the first sensor element has been activated, and wherein the processing device is configured to reject the activations of the one or more sensor element when the first sensor element has been activated.

23. An apparatus, comprising:

means for detecting a presence of a conductive object on a sensing device having one or more sensor elements; and

means for preventing unintentional activation of the sensing device.

24. The apparatus of claim 23, wherein the means for preventing unintentional activation of the sensing device comprises means for measuring a capacitance on an additional sensor element of the sensing device.

25. The apparatus of claim 24, wherein the means for preventing unintentional activation of the sensing device comprises:

means for coupling each of the one or more sensor elements of the sensing device to the additional sensor element; and

measuring a capacitance on the one or more sensor elements and the additional sensor element.

26. An apparatus, comprising:

a touch-sensor button, wherein the touch-sensor button comprises a sensor element; and

a button housing, wherein the sensor elements is recessed from a surface of the button housing, and wherein the recessed sensor element is disposed to prevent unintentional activation of the touch-sensor button by a conductive object.

27. The apparatus of claim 26, further comprising a processing device to detect the presence of the conductive object on the touch-sensor button.

28. The apparatus of claim 26, wherein the processing device is configured to measure a capacitance on the sensor element of the touch-sensor button.