LOCALIZING AN ELECTROSTATIC STYLUS WITHIN A CAPACITIVE TOUCH SENSOR
3 Assignments
0 Petitions
Accused Products
Abstract
Methods, systems, and apparatus relate to capacitive touch sensors with a fine-pointed, active stylus. The active stylus is configured to receive a signal from the capacitive touch sensor for synchronizing a time base of the stylus with the capacitive touch sensor. The active stylus is configured to receive a signal from a matrix of the capacitive touch sensor to measure a first position along one axis, and transmit a signal from the single electrode of the stylus to the matrix to indicate a second position of the stylus along another axis of the matrix. The stylus can transmit the received signal to report the first position of the stylus.
6 Citations
64 Claims
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1-44. -44. (canceled)
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45. An active stylus configured to operate with a capacitive touch sensor, the active stylus comprising:
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an electrode configured to both receive and transmit signals, and configured to electrostatically couple with the capacitive touch sensor; a switch, coupled with the electrode, that is configured to multiplex a relatively large voltage and a relatively small current, wherein the switch is configured to transmit a voltage to the electrode in a transmission mode, and to receive a current from the electrode in a receiving mode; a conductive tip for receiving current from the electrode through the switch, and for transmitting voltage that is coupled through the switch to the electrode; a microcontroller coupled to the receiver and the transmitter circuits and configured to determine at least one position of the active stylus with respect to locations on the capacitive touch sensor; and an internal power source to provide power to at least the microcontroller. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. An active stylus configured to operate with a capacitive touch sensor, the active stylus comprising:
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an electrode configured to both receive and transmit signals, and configured to electrostatically couple with the capacitive touch sensor; a switch, coupled with the electrode, that is configured to multiplex a relatively large voltage and a relatively small current, wherein the switch is configured to transmit a voltage to the electrode in a transmission mode, and to receive a current from the electrode in a receiving mode; a receiver circuit for receiving current from the electrode through the switch; a transmitter circuit for transmitting voltage that is coupled through the switch to the electrode; a microcontroller coupled to the receiver and the transmitter circuits and configured to determine at least one position of the active stylus with respect to locations on the capacitive touch sensor; and an internal power source to provide power to at least the microcontroller. - View Dependent Claims (59, 60, 61, 62, 63)
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64. An active stylus configured to operate with a capacitive touch sensor, the active stylus comprising:
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an electrode configured to both receive and transmit signals, and configured to electrostatically couple with the capacitive touch sensor; a circuit comprising; a switch, coupled with the electrode, that is configured to multiplex a relatively large voltage and a relatively small current, wherein the switch is configured to transmit a voltage to the electrode in a transmission mode, and to receive a current from the electrode in a receiving mode; a receiver circuit for receiving current from the electrode through the switch; and a transmitter circuit for transmitting voltage that is coupled through the switch to the electrode; a microcontroller coupled to the receiver and the transmitter circuits and configured to determine at least one position of the active stylus with respect to locations on the capacitive touch sensor; and an internal power source to provide power to at least the microcontroller.
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Specification