Usage of weighting matrices in multi-phase scanning modes
First Claim
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1. A method comprising:
- driving concurrently a plurality of transmit (TX) signals in different sensing stages on a plurality of TX electrodes of a capacitance sense array, wherein each transmit (TX) signal has a different transmit phase and the different transmit TX phases are defined by an excitation matrix, wherein the excitation matrix is a weighting matrix and wherein the excitation matrix is a square matrix defined by the number of TX electrodes in the plurality of TX electrodes;
measuring receive (RX) signals on a plurality of RX electrodes of the capacitance sense array; and
determining if an object is proximate to the capacitance sense array based on the measured RX signals.
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Abstract
Apparatuses and methods of driving different transmit (TX) phase sequences of a TX signal on TX electrodes in different sensing stages according to a weighting matrix as the excitation matrix. One method drives the TX signals according to the weighting matrix and measures receive (RX) signals on the RX electrodes to determine if an object is proximate to the electrodes.
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Citations
20 Claims
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1. A method comprising:
driving concurrently a plurality of transmit (TX) signals in different sensing stages on a plurality of TX electrodes of a capacitance sense array, wherein each transmit (TX) signal has a different transmit phase and the different transmit TX phases are defined by an excitation matrix, wherein the excitation matrix is a weighting matrix and wherein the excitation matrix is a square matrix defined by the number of TX electrodes in the plurality of TX electrodes;
measuring receive (RX) signals on a plurality of RX electrodes of the capacitance sense array; and
determining if an object is proximate to the capacitance sense array based on the measured RX signals.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A capacitance sensing system, comprising:
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a memory device; and a controller coupled to the memory device, wherein the controller is configured to; drive concurrently a plurality of transmit (TX) signals in different sensing stages on a plurality of TX electrodes of a capacitance sense array to be coupled to the controller, wherein each transmit (TX) signal has a different transmit phase and the different transmit TX phases are defined by an excitation matrix, wherein the excitation matrix is a weighting matrix and wherein the excitation matrix is a square matrix defined by the number of TX electrodes in the plurality of TX electrodes; measure receive (RX) signals on a plurality of RX electrodes of the capacitance sense array; and
determine if an object is proximate to the capacitance sense array based on the measured RX signals. - View Dependent Claims (16, 17)
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18. A host device, comprising:
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a display; a capacitance sensing array disposed in connection with the display, the capacitance sensing array comprises a plurality of transmit (TX) electrodes and a plurality of receive (RX) electrodes; a touchscreen controller coupled to the capacitance sensing array, wherein the touch screen controller is configured to; drive concurrently a plurality of transmit (TX) signals in different sensing stages on a plurality of TX electrodes of a capacitance sense array to be coupled to the controller, wherein each transmit (TX) signal has a different transmit phase and the different transmit TX phases are defined by an excitation matrix, wherein the excitation matrix is a weighting matrix and wherein the excitation matrix is a square matrix defined by the number of TX electrodes in the plurality of TX electrodes; measure receive (RX) signals on a plurality of RX electrodes of the capacitance sense array; and determine if an object is proximate to the capacitance sense array based on the measured RX signals. - View Dependent Claims (19, 20)
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Specification