Circular Touch Sensor
First Claim
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1. A method for determining a location of a contact to a touch sensor comprising:
- detecting the contact to the touch sensor, the touch sensor comprising a plurality of sensor pads arranged about a center point in an iris pattern, each sensor pad having at least one edge that spirals about the center point to an outer boundary;
measuring a capacitance change in one or more of the sensor pads resulting from the contact;
determining a contact ratio for one or more of the sensor pads based on the capacitance change; and
assigning a positional location in accordance with the contact ratio.
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Abstract
A circular touch sensor has three or more sensors arranged in an iris pattern. Each pad is defined by continuous edges that spiral outward about a center point. The unique geometric shape allows measurement of relative amounts of contact on adjoining sensors. In one implementation, the sensors measure relative capacitance of two or more sensors, thereby enabling high precision identification of the point of contact. With as few as three pads, the circular touch sensor is less expensive than traditional 12-pad to 16-pad circular sensors.
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Citations
20 Claims
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1. A method for determining a location of a contact to a touch sensor comprising:
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detecting the contact to the touch sensor, the touch sensor comprising a plurality of sensor pads arranged about a center point in an iris pattern, each sensor pad having at least one edge that spirals about the center point to an outer boundary;
measuring a capacitance change in one or more of the sensor pads resulting from the contact;
determining a contact ratio for one or more of the sensor pads based on the capacitance change; and
assigning a positional location in accordance with the contact ratio. - View Dependent Claims (2, 3, 4, 5)
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6. One or more computer readable storage media containing computer-executable instructions that, when executed by a processor, perform the following:
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detect a contact to a touch sensor, the touch sensor comprising multiple sensor pads arranged about a center point in an iris pattern, each sensor pad having at least one edge that spirals about the center point to an outer boundary;
generate values indicative of the contact to one or more of the sensor pads; and
determine a contact ratio based on the generated values, the contact ratio being used to determine the positional location of the contact. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A device comprising:
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a touch sensor for detecting a contact, the touch sensor comprising multiple sensor pads arranged about a center point in an iris pattern, each sensor pad having at least one edge that spirals about the center point to an outer boundary; and
a processor for generating values indicative of the contact to one or more of the sensor pads, and calculating a contact ratio based on the generated values, the contact ratio being used to determine a positional location of the contact. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification