Methods and systems for detecting a position-based attribute of an object using digital codes
DCFirst Claim
1. A controller for a capacitive position sensor, the controller comprising:
- drive circuitry configured to simultaneously transmit a first signal with a first transmitter electrode and a second signal with a second transmitter electrode, wherein the first and second signals are distinct signals based on distinct digital codes; and
receiver circuitry configured to receive resultant signals with a plurality of receiver electrodes proximate to and capacitively coupled with the first transmitter electrode and the second transmitter electrode;
wherein the controller is configured to adjust a frequency of the first and second signals based on observed noise in the resultant signals.
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Litigations
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Accused Products
Abstract
Methods, systems and devices are described for detecting a position-based attribute of a finger, stylus or other object with a touchpad or other sensor having a touch-sensitive region that includes a plurality of electrodes. Modulation signals for one or more electrodes are produced as a function of any number of distinct digital codes. The modulation signals are applied to an associated at least one of the plurality of electrodes to obtain a resultant signal that is electrically affected by the position of the object. The resultant signal is demodulated using the plurality of distinct digital codes to discriminate electrical effects produced by the object. The position-based attribute of the object is then determined with respect to the plurality of electrodes from the electrical effects.
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Citations
25 Claims
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1. A controller for a capacitive position sensor, the controller comprising:
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drive circuitry configured to simultaneously transmit a first signal with a first transmitter electrode and a second signal with a second transmitter electrode, wherein the first and second signals are distinct signals based on distinct digital codes; and receiver circuitry configured to receive resultant signals with a plurality of receiver electrodes proximate to and capacitively coupled with the first transmitter electrode and the second transmitter electrode;
wherein the controller is configured to adjust a frequency of the first and second signals based on observed noise in the resultant signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of capacitive sensing, the method comprising:
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simultaneously transmitting a first signal with a first transmitter electrode and a second signal with a second transmitter electrode, wherein the first and second signals are distinct signals based on distinct digital codes; receiving resultant signals with a plurality of receiver electrodes proximate to and capacitively coupled with the first transmitter electrode and the second transmitter electrode; and adjusting a frequency of the first and second signals based on observed noise in the resultant signals. - View Dependent Claims (13, 14, 15)
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16. A touch screen comprising,
a plurality of transmitter electrodes; -
a plurality of receiver electrodes; and a controller coupled to the plurality of transmitter electrodes and the plurality of receiver electrodes, the controller configured to; simultaneously transmit a first signal with a first transmitter electrode of the plurality of transmitter electrodes and a second signal with a second transmitter electrode of the plurality of transmitter electrodes, wherein the first and second signals are distinct signals based on distinct digital codes; receive resultant signals with a plurality of receiver electrodes proximate to and capacitively coupled with the first transmitter electrode and the second transmitter electrode; and adjust a frequency of the first and second signals based on observed noise in the resultant signals. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification