Touchpad with capacitive force sensing

• US 10,068,728 B2
• Filed: 04/07/2011
• Issued: 09/04/2018
• Est. Priority Date: 10/15/2009
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: Huska, Andrew P., Krumpelman, Douglas M., Peterson, Cody G.
• Primary Examiner(s): Edwards, Carolyn R
• Assistant Examiner(s): PARKER, JEFFREY ALAN
• Application Number:
  US13/082,293
• Publication Number:
  US 20110227872A1
• Time in Patent Office: 2,707 Days
• Field of Search: 345174, 345173, 345157, 345156
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: H01H 13/85 characterised by tactile feedback features
• CPC Class Codes: H01H 2003/008 with a haptic or a tactile feedback controlled by electrical means, e.g. a motor or magnetofriction
• CPC Class Codes: H01H 2215/05 electromechanical

Abstract

Described herein are techniques related to a touchpad with capacitive force sensing. The described techniques may determine the point or region of a user-engagement surface contacted by a user. In addition, the described techniques may also determine a force of the user'"'"'s finger press on the user-engagement surface using one or more capacitance force-sensors. Furthermore, the described techniques may offer active tactile feedback (i.e., haptics) to the user'"'"'s finger touching the user-engagement surface. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Claims

1. A haptic force-sensing touchpad comprising:

a user-engagement surface presented for contact by a user;

a first spring plate operably associated with the user-engagement surface, wherein the first spring plate comprises a conductive layer;

a second spring plate operably associated with the first spring plate, wherein the second spring plate comprises;

a first capacitive force sensing strip disposed proximate a first edge of the second spring plate,

a second capacitive force sensing strip disposed proximate a second edge of the second spring plate, and

a conductive interior region disposed between the first capacitive force sensing strip and the second capacitive force sensing strip,

wherein the first spring plate and the second spring plate are spaced-apart with a defined gap therebetween;

a return mechanism operably associated with the first spring plate or the second spring plate;

a touch-sensing module operably associated with the user-engagement surface, the touch-sensing module being configured to determine an X/Y position of contact by the user with the user-engagement surface;

a capacitive force-sensing module operably associated with the user engagement surface, the capacitive force-sensing module being configured to determine a force applied to the user-engagement surface in response to a change in a variable capacitance between the first capacitive force sensing strip and the conductive layer; and

an active-feedback actuation mechanism operably associated with the user-engagement surface, the actuation mechanism configured to provide tactile feedback to the user in response to the force applied to the user engagement surface,

wherein the conductive interior region is configured to generate a haptic movement, when activated by the active-feedback actuation mechanism, between the first spring plate and the second spring plate, and

wherein the return mechanism is configured to restore, after the haptic movement, the defined gap between the first spring plate and the second spring plate.

2. A haptic force-sensing touchpad as recited in claim 1, wherein the capacitive force-sensing module determines the force applied to the user engagement surface by the user'"'"'s contact therewith by determining a z direction deflection of the user-engagement surface caused by the force applied to the user-engagement surface.

3. A haptic force-sensing touchpad as recited in claim 1, wherein the touch-sensing module determines the X/Y position of the user'"'"'s contact with the user-engagement surface by determining the force applied to the user-engagement surface by the user'"'"'s contact therewith.

4. A haptic force-sensing touchpad as recited in claim 1, further comprising a resistance mechanism operably associated with the user engagement surface and configured to resist a movement of the user engagement surface in at least one direction of Z.

5. A force-sensing apparatus comprising:

a user-engagement surface presented for contact by a user;

a first spring plate operably associated with the user-engagement surface, wherein the first spring plate comprises a conductive layer;

a second spring plate operably associated with the first spring plate, wherein the second spring plate comprises;

a first capacitive force sensing strip disposed proximate a first edge of the second spring plate,

a second capacitive force sensing strip disposed proximate a second edge of the second spring plate, and

a conductive interior region disposed between the first capacitive force sensing strip and the second capacitive force sensing strip,

wherein the first spring plate and the second spring plate are spaced-apart with a defined gap therebetween;

a capacitive force-sensing module operably associated with the user-engagement surface,

the capacitive force-sensing module being configured to determine a force applied to the user-engagement surface in response to a change in a variable capacitance between the first capacitive force sensing strip and the conductive layer; and

an active-feedback actuation mechanism operably associated with the user-engagement surface, the actuation mechanism configured to provide tactile feedback to the user in response to the force applied to the user-engagement surface by the user, wherein the conductive interior region is configured to generate haptic movement, when activated by the active-feedback actuation mechanism, between the first spring plate and the second spring plate.

6. A force-sensing apparatus as recited in claim 5, further comprising a touch-sensing module operably associated with the user engagement surface and configured to determine an X/Y position of a contact by the user with the user-engagement surface.

7. A force-sensing apparatus as recited in claim 5, wherein the capacitive force-sensing module is further configured to move the first spring plate or the second spring plate corresponding to a Z direction deflection of the user-engagement surface, the deflection being caused, at least in part, by the force applied to the user-engagement surface.

8. A force-sensing apparatus as recited in claim 5, further comprising a resistance mechanism operably associated with the user engagement surface and configured to resist a movement of the user engagement surface in at least one direction of Z.

9. A force-sensing apparatus as recited in claim 5, wherein the active-feedback actuation mechanism further comprises:

a return mechanism operably associated with the first spring plate or the second spring plate, wherein the return mechanism is configured to restore, after the haptic movement, the defined gap between the first spring plate and the second spring plate.

10. A force-sensing apparatus as recited in claim 5, wherein the active-feedback actuation mechanism is further configured to provide the tactile feedback to the user in response to an increase in the force applied to the user-engagement surface by the user.

11. A method comprising:

receiving X/Y data from one or more touch sensors regarding a contact by a user on a user-engagement surface of an input apparatus;

based upon the received X/Y data, determining an X/Y position of the contact by the user on the user-engagement surface;

receiving Z data from one or more force sensors regarding deflection of a first spring plate from a second spring plate in a Z direction caused by a force applied to the user-engagement surface by the user'"'"'s contact therewith, wherein the user engagement surface is operably associated with the first spring plate and the second spring plate;

based upon the received Z data, determining the force applied to the user-engagement surface by the user'"'"'s contact therewith, wherein the force is determined from a change in a variable capacitance between a conductive layer in the first spring plate and a first capacitive force sensing strip proximate a first edge of the second spring plate;

triggering an active-feedback actuation mechanism of the input apparatus to provide tactile feedback to the user, wherein the triggering is performed in response to, at least in part, the determined force; and

generating, in response to triggering the active-feedback actuation mechanism and using a conductive interior region, haptic movement between the first spring plate and the second spring plate,

wherein the conductive interior region is disposed between the first capacitive force sensing strip and a second capacitive force sensing strip proximate a second edge of the second spring plate.

12. A method as recited in claim 11, further comprising reporting the determined X/Y position and determined force to a host device of the input apparatus.

13. A method as recited in claim 11, wherein the active-feedback actuation mechanism further includes:

a return mechanism operably associated with the first spring plate or the second spring plate, wherein the return mechanism is configured to restore, after the haptic movement, a defined gap between the first spring plate and the second spring plate.

14. A method comprising:

receiving position and force input data from an input device with a user-engagement surface, the position input data indicating an X/Y position of a contact by a user on the user-engagement surface and the force input data indicating a force applied to the user-engagement surface by the user'"'"'s contact therewith, wherein the force input data corresponds to a change in a variable capacitance between a conductive layer in a first spring plate and a first capacitive force sensing strip in a second spring plate, and wherein the user engagement surface is operably associated with the first spring plate and the second spring plate;

ascertaining whether position input data corresponds with an active area of the displayed user interface;

ascertaining a location of an on-screen cursor based upon the position input data;

moving an on-screen cursor of a displayed user interface in accordance with the position input data;

based, at least in part, upon the ascertained location of the on-screen cursor and the force input data, determining whether to provide an active tactile feedback to the user using a feedback actuation mechanism; and

in response to the determining and using the feedback actuation mechanism, facilitating haptic movement between the first spring plate and the second spring plate,

wherein the haptic movement is facilitated using electrostatic forces generated by a conductive interior region in the second spring plate, and

wherein the conductive interior region is disposed between the first capacitive force sensing strip and a second capacitive force sensing strip in the second spring plate.

15. A method as recited in claim 14, further comprising:

based, at least in part, upon the ascertained location of the on-screen cursor and the force input data, determining whether to perform one or more cursor-position associated functions;

in response to the determining whether to perform, initiating the one or more cursor;

position associated functions.

16. A method as recited in claim 15, wherein the one or more cursor-position associated functions is selected from a group consisting of accessing a file, menu pull down, menu selection, icon or button selection, program execution, properties access, cursor positioning, character or image selection, single-click type function, double-click type function, and right-click type function, viewing and/or selecting balloons, viewing and/or selecting check boxes, selecting a command button, selecting a command link, dropping down drop-down lists and/or combo boxes, opening a link, viewing and/or selecting list boxes, viewing and/or selecting list views, viewing and/or selecting notifications, viewing and/or selecting progress bars, viewing and/or selecting progressive disclosure controls, viewing and/or selecting radio buttons, viewing and/or selecting search boxes, viewing and/or selecting sliders, viewing and/or selecting spin control, viewing and/or selecting status bars, viewing and/or selecting tabs, viewing and/or selecting text boxes, viewing and/or selecting tooltips, viewing and/or selecting infotips, viewing and/or selecting tree views, viewing and/or selecting windows, viewing and/or selecting menus, viewing and/or selecting toolbars, viewing and/or selecting ribbons, dragging and/or dropping functions, copying functions, cutting function, pasting function, and cut-and-pasting function.