Fast multi-touch sensor with user identification techniques
First Claim
1. A method for distinguishing between sources of simultaneous touch events on a touch sensitive device, the touch sensitive device comprising:
- plurality of row conductors and a plurality of column conductors, the path of each of the row conductors crossing the path of each of the column conductors,signal transmitter operatively connected to each of the plurality of row conductors, the signal transmitter adapted to simultaneously transmit a plurality of signals on each of the plurality of row conductors, respectively;
receiver operatively connected to each of the plurality of column conductors, the receiver adapted to receive signals from each column during a plurality of sequential measurement periods,wherein the touch sensitive device is adapted to identify a location of each of a plurality of simultaneous touch events,the method comprising;
providing a plurality of frequency orthogonal signals to the signal transmitter, thereby causing each one of the plurality of frequency orthogonal signals to be simultaneously transmitted on respective ones of the plurality of row conductors;
processing column signals received by the receiver during a plurality of measurement periods to determine a strength of each of the plurality of frequency orthogonal signals in the column signals received by the receiver during that measurement period, such that for each measurement period a signal strength is determined for each of the plurality of frequency orthogonal signals for each column conductor; and
associating at least two of a plurality of simultaneous touch events with a discrete source based on the identification of body-transmitted cross-talk therebetween as reflected by the determined signal strength for the locations of each of the at least two of the plurality of simultaneous touch events.
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Accused Products
Abstract
A method and system for distinguishing between sources of simultaneous touch events on a touch sensitive device with row conductors and column conductors, the path of each of the row conductors crossing the path of each of the column conductors. Orthogonal signals are simultaneously transmitted on a respective one of the rows. Each column is processed to determine strength of each of the orthogonal signals present thereon. Simultaneous touch locations are associated with a discrete source based on the presence of body-transmitted cross-talk therebetween, as reflected by the determined signal strength corresponding to the touch locations. Alternatively or additionally, a user-coupled signal generator generating another orthogonal signal provides a user-unique signal to the receivers. The signal strength of the user-unique signal is used to associate one or more touch locations with the user coupled to the user-coupled signal generator.
10 Citations
5 Claims
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1. A method for distinguishing between sources of simultaneous touch events on a touch sensitive device, the touch sensitive device comprising:
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plurality of row conductors and a plurality of column conductors, the path of each of the row conductors crossing the path of each of the column conductors, signal transmitter operatively connected to each of the plurality of row conductors, the signal transmitter adapted to simultaneously transmit a plurality of signals on each of the plurality of row conductors, respectively; receiver operatively connected to each of the plurality of column conductors, the receiver adapted to receive signals from each column during a plurality of sequential measurement periods, wherein the touch sensitive device is adapted to identify a location of each of a plurality of simultaneous touch events, the method comprising; providing a plurality of frequency orthogonal signals to the signal transmitter, thereby causing each one of the plurality of frequency orthogonal signals to be simultaneously transmitted on respective ones of the plurality of row conductors; processing column signals received by the receiver during a plurality of measurement periods to determine a strength of each of the plurality of frequency orthogonal signals in the column signals received by the receiver during that measurement period, such that for each measurement period a signal strength is determined for each of the plurality of frequency orthogonal signals for each column conductor; and associating at least two of a plurality of simultaneous touch events with a discrete source based on the identification of body-transmitted cross-talk therebetween as reflected by the determined signal strength for the locations of each of the at least two of the plurality of simultaneous touch events. - View Dependent Claims (2, 3, 4, 5)
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Specification