Fast multi-touch sensor
First Claim
1. A low-latency touch sensor for use in connection with a touch surface having a first and second plurality of conductors being arranged such that a touch event proximate to the low-latency touch sensor causes a change in coupling between at least one of the first plurality of conductors and at least one of the second plurality of conductors the low-latency touch sensor comprising:
- transmitter operatively connected to each of the first and second plurality of conductors, the transmitter adapted to;
transmit each of a first set of signals from a plurality of unique frequency orthogonal signals on each of the first plurality of conductors simultaneously, each unique frequency orthogonal signal in the plurality of unique frequency orthogonal signals being orthogonal to each of the other unique frequency orthogonal signals; and
transmit each of a second set of signals from the plurality of unique frequency orthogonal signals on each of the second plurality of conductors simultaneously;
receiver operatively connected to each of the first and second plurality of conductors the receiver adapted to receive signals from each of the first and second plurality of conductors; and
signal processor adapted to;
determine a measurement for each of the unique frequency orthogonal signals in the signals received by the receiver, anddetermine a touch event location using the measurement for a unique frequency orthogonal signal received from the first plurality of conductors and the corresponding measurement for a unique frequency orthogonal signal received from the second plurality of conductors.
2 Assignments
0 Petitions
Accused Products
Abstract
A low-latency touch sensor is disclosed for use in connection with a touch surface having first and second conductors sensitive to changes in coupling therebetween as a result of touch (and/or near-touch). A signal generator generates unique orthogonal signals, a transmitter transmits the orthogonal signals on each of the first conductors. Receivers connected to the second conductors receive signals during a measurement period. The signals measured during the measurement period are processed to determine, for each measurement period, and for each of the second conductors, a signal strength corresponding to each of the unique orthogonal signals. The signal strengths can be used as a basis to determine touch events.
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Citations
20 Claims
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1. A low-latency touch sensor for use in connection with a touch surface having a first and second plurality of conductors being arranged such that a touch event proximate to the low-latency touch sensor causes a change in coupling between at least one of the first plurality of conductors and at least one of the second plurality of conductors the low-latency touch sensor comprising:
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transmitter operatively connected to each of the first and second plurality of conductors, the transmitter adapted to; transmit each of a first set of signals from a plurality of unique frequency orthogonal signals on each of the first plurality of conductors simultaneously, each unique frequency orthogonal signal in the plurality of unique frequency orthogonal signals being orthogonal to each of the other unique frequency orthogonal signals; and transmit each of a second set of signals from the plurality of unique frequency orthogonal signals on each of the second plurality of conductors simultaneously; receiver operatively connected to each of the first and second plurality of conductors the receiver adapted to receive signals from each of the first and second plurality of conductors; and signal processor adapted to; determine a measurement for each of the unique frequency orthogonal signals in the signals received by the receiver, and determine a touch event location using the measurement for a unique frequency orthogonal signal received from the first plurality of conductors and the corresponding measurement for a unique frequency orthogonal signal received from the second plurality of conductors. - View Dependent Claims (2)
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3. A low-latency touch sensor for use in connection with a touch surface having a first and second plurality of conductors being arranged such that a touch event proximate to the low-latency touch sensor causes a change in coupling between at least one of the first plurality of conductors and at least one of the second plurality of conductors, and wherein when the touch surface is not being touched a first amount of signal is coupled between them, and when the touch surface is being touched a different amount of signal is coupled between them, the low-latency touch sensor comprising:
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signal generator adapted to generate a plurality of unique frequency orthogonal signals, each unique frequency orthogonal signal being orthogonal to each of the other unique frequency orthogonal signals and each unique frequency orthogonal signal being pre-selected so as to have a relationship with the other unique frequency orthogonal signals wherein the plurality of unique frequency orthogonal signals have a lowest frequency and a highest frequency, the highest frequency being less than twice the lowest frequency; transmitter operatively connected to the first and second plurality of conductors, the transmitter adapted to transmit each of a first set of signals from the plurality of unique frequency orthogonal signals on each of the first plurality of conductors simultaneously; and transmit each of a second set of signals from the plurality of unique frequency orthogonal signals on each of the second plurality of conductors; receiver operatively connected to the first and second plurality of conductors, the receiver adapted to receive signals from the first plurality of conductors during a measurement period (τ
), the receiver adapted to receive signals during the measurement period (τ
) from each of the second plurality of conductors; andsignal processor adapted to determine a measurement for each of the unique frequency orthogonal signals in the signals received by the receiver during the measurement period (τ
), such that for each measurement period (τ
) at least one measurement is determined for each of the plurality of unique frequency orthogonal signals for each of the first and second plurality of conductors, wherein the signal processor is further adapted to determine a touch event location using the measurement for a unique frequency orthogonal signal received from the first plurality of conductors and the corresponding measurement for a unique frequency orthogonal signal received from the second plurality of conductors. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A low-latency touch sensor for use in connection with a touch surface having a first and second plurality of conductors being arranged such that a touch event proximate to the low-latency touch sensor causes a change in coupling between at least one of the first plurality of conductors and at least one of the second plurality of conductors, and wherein when the touch surface is not being touched a first amount of signal is coupled between them, and when the touch surface is being touched a different amount of signal is coupled between them, the low-latency touch sensor comprising:
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signal generator adapted to generate a plurality of unique frequency orthogonal signals, each unique frequency orthogonal signal being orthogonal to each of the other unique frequency orthogonal signals and each unique frequency orthogonal signal being spaced apart from one-another by a spacing; transmitter operatively connected to the first plurality of conductors, the transmitter adapted to simultaneously transmit each of a first set of signals from the plurality of unique frequency orthogonal signals on each of the first plurality of conductors, respectively, wherein the transmitter is adapted to transmit each of a second set of signals from the plurality of unique frequency orthogonal signals on each of the second plurality of conductors; receiver operatively connected to the first and second plurality of conductors, the receiver adapted to receive signals during a measurement period from the first plurality of conductors, the receiver adapted to receive signals during the measurement period from each of the second plurality of conductors; and signal processor adapted to determine a measurement for each of the plurality of unique frequency orthogonal signals in the signals received by the receiver during the measurement period, such that for each measurement period one measurement is determined for each of the plurality of unique frequency orthogonal signals for each of the first and second plurality of conductors;
wherein the signal processor is further adapted to determine a touch event location using the measurement for a unique frequency orthogonal signal received from the first plurality of conductors and the corresponding measurement for a unique frequency orthogonal signal received from the second plurality of conductors. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification