Multi-purpose stylus antenna
First Claim
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1. An apparatus comprising:
- a capacitive sense array comprising a plurality of capacitive sense elements, the plurality of capacitive sense elements configured to detect a conductive object proximate to the capacitive sense array; and
a conductive element disposed adjacent to the capacitive sense array, wherein the conductive element is configured to operate as an antenna in a first mode and as an additional capacitive sense element in a second mode;
a capacitance sensor coupled to the capacitive sense array and selectively coupled to the conductive element in the second mode, wherein the capacitance sensor is configured to measure capacitances associated with the plurality of capacitive sense elements in the first mode and to measure an additional capacitance associated with the conductive element in the second mode; and
a transmitter selectively coupled to the conductive element in the first mode.
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Abstract
Methods and apparatuses of a multi-purpose stylus antenna are described. One device includes a processing device comprising a switch, an antenna circuit, and a capacitance sensor. The switch is configured to couple a conductive element between the antenna circuit and the capacitance sensor. The processing device is configured to communicate data to or from a stylus when the switch is coupled to the antenna circuit and to measure capacitance associated with the conductive element when the switch is coupled to the capacitance sensor.
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Citations
20 Claims
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1. An apparatus comprising:
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a capacitive sense array comprising a plurality of capacitive sense elements, the plurality of capacitive sense elements configured to detect a conductive object proximate to the capacitive sense array; and a conductive element disposed adjacent to the capacitive sense array, wherein the conductive element is configured to operate as an antenna in a first mode and as an additional capacitive sense element in a second mode; a capacitance sensor coupled to the capacitive sense array and selectively coupled to the conductive element in the second mode, wherein the capacitance sensor is configured to measure capacitances associated with the plurality of capacitive sense elements in the first mode and to measure an additional capacitance associated with the conductive element in the second mode; and a transmitter selectively coupled to the conductive element in the first mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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detecting a conductive object proximate to a capacitive sense array comprising a plurality of capacitive sense elements, wherein detecting the conductive object comprises measuring capacitances associated with the plurality of capacitive sense elements in a first mode; communicating data to or from another device using a conductive element disposed adjacent to the capacitive sense array in the first mode at a first time; and detecting the conductive object proximate to the conductive element in a second mode at a second time, wherein detecting the conductive object at the second time comprises measuring an additional capacitance associated with the conductive element in the second mode. - View Dependent Claims (15, 16, 17, 18)
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19. A device comprising
a processing device comprising a switch, an antenna circuit, and a capacitance sensor, wherein the switch is configured to couple a conductive element between the antenna circuit and the capacitance sensor, wherein the processing device is configured to communicate data to or from a stylus when the switch is coupled to the antenna circuit and to measure capacitance associated with the conductive element when the switch is coupled to the capacitance sensor.
Specification