Piezoelectric sensing as user input means

• US 20090002199A1
• Filed: 07/17/2007
• Published: 01/01/2009
• Est. Priority Date: 06/28/2007
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Lainonen, Juhani, Karhiniemi, Marko
• Application Number:
  US11/879,739
• Publication Number:
  US 20090002199A1
• Time in Patent Office: Days
• US Class Current: 341/20
• CPC Class Codes: H03K 17/964 Piezoelectric touch switches

Abstract

The specification and drawings present a new apparatus and method for providing and using piezoelectric sensing with force detection as user input means possibly in combination with touch sensing methods in a user interface module (e.g., touch pad, keyboard, keymat, touch-screen, etc.).

Claims

1. An apparatus, comprising:

a user interface layer comprising a touch surface; and

a piezoelectric layer, configured to provide one or more levels of a force detection signal in response to an object touching said touch surface with one or more levels of a pressing force for applying a mechanical stress to said piezoelectric layer, wherein said one or more levels of the force detection signal correspond to said one or more levels of said pressing force and are for communicating one or more predetermined commands.

2. The apparatus of claim 1, wherein the level of said force detection signal is proportional to said level of a predetermined force.

3. The apparatus of claim 2, wherein said apparatus is configured to use said one or more predetermined commands for continuously scrolling information using varying said force detection signal as a function of said pressing force.

4. The apparatus of claim 1, further comprising:

a first electrode layer; and

a second electrode layer,

wherein said piezoelectric layer is between said first electrode layer and said second electrode layer for providing said force detection signal.

5. The apparatus of claim 4, wherein said first electrode layer is a touch sensor/electrode layer, configured to provide a sensor signal as a function of a location of an object on or near said non-flat touch surface when said object touches or in a close proximity of said touch surface, and

wherein said second electrode layer is a reference potential layer or a ground electrode layer.

6. The apparatus of claim 1, further comprising:

a touch sensor layer, configured to provide a sensor signal as a function of a location of an object on or near said touch surface when said object touches or is in a close proximity to said touch surface,

wherein said force detection signal and said sensor signal are used in combination to provide control information.

7. The apparatus of claim 6, wherein said user interface layer, said touch sensor layer and said piezoelectric layer are parts of a user interface module.

8. The apparatus of claim 6, wherein said touch sensor layer comprises a touch sensor for providing said sensor signal and said touch sensor is a capacitive sensor, a resistive-capacitive sensor or a resistive sensor.

9. The apparatus of claim 6, wherein said touch sensor layer is an impedance sensor conductive layer of a rectangular shape with four contact points at corners of said touch sensor.

10. The apparatus of claim 1, wherein said piezoelectric layer is made of a polymer or a polymer and ceramic mixture.

11. The apparatus of claim 1, further comprising:

a semi-soft polymer layer configured to provide a pre-selected bending level of said piezoelectric layer.

12. The apparatus of claim 1, wherein said apparatus is an electronic device configured for wireless communications.

13. A user interface module, comprising:

a user interface layer comprising a touch surface; and

a piezoelectric layer, configured to provide one or more levels of a force detection signal in response to an object touching said touch surface with one or more levels of a pressing force for applying a mechanical stress to said piezoelectric layer, wherein said one or more levels of the force detection signal correspond to said one or more levels of said pressing force and are for communicating one or more predetermined commands to an electronic device.

14. The user interface module of claim 13, wherein said user interface module is a part of said electronic device.

15. The user interface module of claim 13, wherein said user interface module is connected to said electronic device by an electrical or wireless connection.

16. The user interface module of claim 13, wherein the level of said force detection signal is proportional to said level of a predetermined force.

17. The user interface module of claim 16, wherein said user interface module is configured to use said one or more predetermined commands for continuously scrolling information using varying said force detection signal as a function of said pressing force.

18. The user interface module of claim 13, further comprising:

a first electrode layer; and

a second electrode layer,

wherein said piezoelectric layer is between said first electrode layer and said second electrode layer for providing said force detection signal.

19. The user interface module of claim 13, wherein said first electrode layer is a touch sensor/electrode layer, configured to provide a sensor signal as a function of a location of an object on or near said non-flat touch surface when said object touches or in a close proximity of said touch surface, and

wherein said second electrode layer is a reference potential layer or a ground electrode layer.

20. The user interface module of claim 13, further comprising:

a touch sensor layer, configured to provide a sensor signal as a function of a location of an object on or near said touch surface when said object touches or is in a close proximity to said touch surface,

wherein said force detection signal and said sensor signal are used in combination to provide control information.

21. The user interface module of claim 20, wherein said user interface layer, said touch sensor layer and said piezoelectric layer are parts of a user interface module.

22. The user interface module of claim 20, wherein said touch sensor layer comprises a touch sensor for providing said sensor signal and said touch sensor is a capacitive sensor, a resistive-capacitive sensor or a resistive sensor.

23. The user interface module of claim 20, wherein said touch sensor layer is an impedance sensor conductive layer of a rectangular shape with four contact points at corners of said touch sensor.

24. The user interface module of claim 13, wherein said piezoelectric layer is made of a polymer or a polymer and ceramic mixture.

25. The user interface module of claim 13, further comprising:

a semi-soft polymer layer configured to provide a pre-selected bending level of said piezoelectric layer.

26. A method, comprising:

pressing a touch surface of a user interface layer by an object with a pressing force for applying a mechanical stress to a piezoelectric layer; and

providing a force detection signal in response to said object touching said touch surface with the pressing force by said piezoelectric layer, wherein said piezoelectric layer is configured to provide one or more levels of the force detection signal in response to said object touching said touch surface with one or more levels of said pressing force, wherein said one or more levels of the force detection signal correspond to said one or more levels of said pressing force and are for communicating at least two predetermined commands to an electronic device.

27. The method of claim 26, wherein said pressing is for providing said force detection signal to wake up said electronic device.

28. The method of claim 26, further comprising:

further touching a touch surface of the user interface layer by said object; and

providing by a touch sensor layer a sensor signal as a function of a location of the object on said touch surface in response to said further touching,

wherein said force detection signal and said sensor signal are used in combination to provide control information to an electronic device.

29. The method of claim 28, wherein said user interface layer, said touch sensor layer and said piezoelectric layer are parts of a user interface module.

30. The method of claim 28, wherein said touch sensor layer comprises a touch sensor for providing said sensor signal and said touch sensor is a capacitive sensor, a resistive-capacitive sensor or a resistive sensor.

31. The method of claim 28, wherein said touch sensor layer is an impedance sensor conductive layer of a rectangular shape with four contact points at corners of said touch sensor.

32. The method of claim 26, wherein the level of said force detection signal is proportional to said level of a predetermined force.

33. The method of claim 26, wherein said one or more predetermined commands are for continuously scrolling information using varying said force detection signal as a function of said pressing force.

34. The method of claim 26, wherein said piezoelectric layer is made of a polymer or a polymer and ceramic mixture.