Integrated Touch Sensor and Force Sensor for an Electronic Device
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Abstract
Systems and method of performing touch and force sensing in an electronic device. The device includes a cover and an array of touch-sensor electrodes disposed below the cover. The first array of electrodes may be configured to sense a touch on the cover using a capacitive sensing scheme. The device also includes a force-sensor drive electrode disposed below the first array of electrodes and a force-sensor sense electrode disposed below the force-sensor drive electrode. The force-sensor drive and sense electrode may be configured to sense a force on the cover. The device also includes a shared drive circuit having an output that is operatively coupled to the array of touch-sensor electrodes and the force-sensor drive electrode.
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Citations
40 Claims
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1-20. -20. (canceled)
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21. A touch and force sensing device comprising:
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a cover; a layer of touch-sensor electrodes disposed below the cover, the layer of touch-sensor electrodes being configured to sense a touch on the cover; a force-sensor drive electrode layer disposed below the cover; a force-sensor sense electrode layer disposed below the cover, wherein the force-sensor drive electrode layer and the force-sensor sense electrode layer are configured to sense a force on the cover; and a shared voltage source operatively coupled to the layer of touch-sensor electrodes and the force-sensor drive electrode later. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. An electronic device comprising:
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a housing; a display disposed within an opening of the housing; a cover disposed over the display; an array of touch-sensor electrodes disposed below the cover, the array of touch-sensor electrodes being configured to sense a touch on the cover; a force-sensor drive electrode disposed in a first layer below the cover; a force-sensor sense electrode disposed in a second layer, wherein the force-sensor drive electrode and force-sensor sense electrode are configured to sense a force on the cover; and a shared voltage source operatively coupled to the array of touch-sensor electrodes and the force-sensor drive electrodes. - View Dependent Claims (31, 32, 33, 34, 35)
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36. A method of performing touch and force sensing on a cover of a device, the method comprising:
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transmitting a drive signal to an array of touch-sensor electrodes using a common voltage source, the array of touch-sensor electrodes being disposed below the cover; transmitting the drive signal to a force-sensor drive electrode using the common voltage source; sensing a response from the array of touch-sensor electrodes; determining if an object is touching the cover based on the sensed response from the array of touch sensor electrodes; sensing a response from a force-sensor sense electrode; and determining a force associated with the object touching the cover based on the sensed response from the force-sensor sense electrode. - View Dependent Claims (37, 38, 39, 40)
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Specification