Touch and force sensing for input devices

• US 8,421,483 B2
• Filed: 06/13/2008
• Issued: 04/16/2013
• Est. Priority Date: 06/13/2008
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications USA Incorporated (Sony Group Corp.)
• Inventors: Klinghult, Gunnar, Kleverman, Mats
• Primary Examiner(s): He, Amy
• Application Number:
  US12/138,782
• Publication Number:
  US 20090309616A1
• Time in Patent Office: 1,768 Days
• Field of Search: 324/686, 324/658, 345/173, 345/174
• US Class Current: 324/686
• 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 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A device may include a first layer, a second layer, a third layer, a capacitive sensing component coupled to the first layer, and a force sensing component coupled to the first layer and the third layer and configured to detect the amount of force applied to the second layer. A method may include monitoring capacitance and voltage at one or more input sensors configured to detect changes in capacitance and to detect changes in applied force, detecting a change in capacitance, activating a capacitance response in response to detecting a change in capacitance, detecting a change in voltage, and activating a force response in response to detecting a change in voltage.

Claims

1. A device, comprising:

a touch screen configured to sense at least capacitance, force, or a combination of capacitance and force; and

wherein the touch screen comprise;

a plurality of sensors located at a plurality of locations;

a first layer, wherein the first layer is configured as a conductive layer or a screening layer;

a second layer coupled to the first layer, wherein the second layer is configured to sense force, and

a third layer configured as a conductive layer or a screening layer;

a capacitance sensing component coupled to the first layer and the plurality of sensors;

a force sensing component coupled to the plurality of sensors, the first layer and the third layer,

wherein the force sensing component is configured to determine which particular sensor of the plurality of sensors has been activated and to detect an amount of force applied to the second layer, and

wherein the force sensing component generates one of a plurality of force responses, from a set of force responses in response to the force exerted on the particular sensor associated with one of the plurality of locations,

wherein the force response is based on at least one of a detected amount of force sensed or a duration of force exerted on the particular sensor, and

wherein different areas of the touch screen are configured to have different sensitivities to touch, and wherein the different sensitivities to touch are adjustable.

2. The device of claim 1, where the second layer comprises a piezoelectric, optically transparent material.

3. The device of claim 2, where the second layer comprises one of polyvinylidene fluoride, poly(vinylidene-trifluoroethylene), poly(vinylidene-tetrafluoroethylene), or two or more of polyvinylidene fluoride, poly(vinylidene-trifluoroethylene), and poly(vinylidene-tetrafluoroethylene).

4. The device of claim 1, where the first and third layer comprise a conductive, optically transparent material.

5. The device of claim 4, where the first and third layers comprise one of indium tin oxide, aluminum-doped zinc oxide, carbon nanotubes, Poly(3,4-ethylenedioxythiophene), or Poly((3,4-ethylenedioxythiophene)-poly(styrenesulfonate).

6. The device of claim 1, where the force sensing component is configured to execute a plurality of actions, where each of the plurality of actions is different and is executed in response to a different amount of force detected.

7. The device of claim 6, where each of the plurality of actions corresponds to a different degree of the same action.

8. The device of claim 1, where the force sensing component is configured to control an intensity of an action or the number of objects to include in the action.

9. An input device comprising an array of devices according to claim 1.

10. A mobile terminal comprising an input device according to claim 9.

11. The input device of claim 9, where the input device is a button, a touch screen, a keyboard, a key pad, or a scroll wheel.

12. The device of claim 1, wherein the capacitance sensing component is configured to execute an action or series of actions selected by a user based on the different areas and different sensitivities.

13. The device of claim 1, comprising

a user interface, wherein a user configures via the user interface the sensitivities to touch of the device.