Proximity edge sensing
First Claim
1. A combined proximity and force sensor, comprising:
- a first electrode;
a second electrode;
a compressible material separating the first and the second electrodes; and
a third electrode coupled to the first electrode and positioned so that the first electrode is between the second electrode and the third electrode;
wherein the combined proximity and force sensor is operable to;
produce a first change in capacitance between the first and the second electrodes related to compression of the compressible material while the third electrode functions as a force sensing ground shield, the first change in capacitance usable by a processing unit to determine an applied force; and
produce a second change in capacitance of the third electrode while the first electrode functions as a proximity ground shield, the second change in capacitance usable by the processing unit to sense proximity of an object.
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Accused Products
Abstract
In various implementations, a sensor operates in a force sensing mode by determining an applied force based on a first change in capacitance between first and second electrodes related to compression of a compressible material positioned between while the third electrode functions as a shield and in a proximity sensing mode by sensing proximity of an object based on a second change in capacitance of the third electrode while the first and/or second electrodes function as a shield. In some implementations, a device has a cover glass including a surface having a display area, an edge surface, and a cavity; a touch sensing electrode oriented toward the surface; an electrode positioned in the cavity oriented toward the edge surface; and a processing unit operable to detect touch or proximity of an object to the edge surface based on a change in capacitance between the electrode and the object.
127 Citations
20 Claims
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1. A combined proximity and force sensor, comprising:
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a first electrode; a second electrode; a compressible material separating the first and the second electrodes; and a third electrode coupled to the first electrode and positioned so that the first electrode is between the second electrode and the third electrode; wherein the combined proximity and force sensor is operable to; produce a first change in capacitance between the first and the second electrodes related to compression of the compressible material while the third electrode functions as a force sensing ground shield, the first change in capacitance usable by a processing unit to determine an applied force; and produce a second change in capacitance of the third electrode while the first electrode functions as a proximity ground shield, the second change in capacitance usable by the processing unit to sense proximity of an object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic device, comprising:
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a housing; a cover glass positioned adjacent to the housing, the cover glass including; a cover glass surface having a display area; a cover glass edge surface; and a cavity formed partially into the cover glass opposite the cover glass surface apart from the display area; a capacitive touch sensing electrode positioned on the cover glass opposite the cover glass surface in the display area, oriented toward the cover glass surface; an additional electrode positioned in the cavity, oriented toward the cover glass edge surface; and a processing unit connected to the additional electrode that is operable to detect touch or proximity of an object to the cover glass edge surface based on a change in capacitance between the additional electrode and the object. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of controlling a combined proximity and force sensor, comprising:
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operating the combined proximity and force sensor in a force sensing mode by determining an applied force based on a first change in capacitance between a first electrode and a second electrode of the combined proximity and force sensor while using a third electrode of the combined proximity and force sensor as a force sensing ground shield; operating the combined proximity and force sensor in a proximity sensing mode by sensing proximity of an object based on a second change in capacitance of the third electrode while using the first electrode as a proximity sensing ground shield; and switching the combined proximity and force sensor between the proximity sensing mode and the force sensing mode. - View Dependent Claims (17, 18, 19, 20)
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Specification