HIGH SPEED MULTI-TOUCH TOUCH DEVICE AND CONTROLLER THEREFOR
First Claim
1. A touch-sensitive apparatus, comprising:
- a panel comprising a touch surface and a plurality of electrodes defining an electrode matrix, the plurality of electrodes comprising a plurality of drive electrodes and a plurality of receive electrodes, each drive electrode being capacitively coupled to each receive electrode at a respective node of the matrix, the panel being configured such that a touch on the touch surface proximate a given one of the nodes changes a coupling capacitance between the drive electrode and the receive electrode associated with the given node;
a drive unit configured to generate a drive signal and to deliver the drive signal to the drive electrodes one at a time;
a sense unit configured to generate, for each drive signal delivered to each drive electrode, response signals for the plurality of receive electrodes, each of the response signals comprising a differentiated representation of the drive signal, an amplitude of each of the response signals being responsive to the coupling capacitance at the associated node; and
a measurement unit configured to measure the amplitude of each of the response signals for each of the nodes, and to determine therefrom the positions of multiple temporally overlapping touches, if present, on the touch surface.
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Accused Products
Abstract
A touch-sensitive device includes a touch panel, a drive unit, a sense unit, and a measurement unit. A touch applied to a node of the panel changes a capacitive coupling between two electrodes (a drive electrode and a sense electrode) of the touch panel. The drive unit delivers a drive signal, which may comprise one or more drive pulses, to the drive electrode. The sense unit couples to the sense electrode, and generates a response signal that includes a differentiated representation of the drive signal. The amplitude of the response signal is responsive to the capacitive coupling between the electrodes, and is measured to provide an indication of a touch at the node.
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Citations
20 Claims
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1. A touch-sensitive apparatus, comprising:
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a panel comprising a touch surface and a plurality of electrodes defining an electrode matrix, the plurality of electrodes comprising a plurality of drive electrodes and a plurality of receive electrodes, each drive electrode being capacitively coupled to each receive electrode at a respective node of the matrix, the panel being configured such that a touch on the touch surface proximate a given one of the nodes changes a coupling capacitance between the drive electrode and the receive electrode associated with the given node; a drive unit configured to generate a drive signal and to deliver the drive signal to the drive electrodes one at a time; a sense unit configured to generate, for each drive signal delivered to each drive electrode, response signals for the plurality of receive electrodes, each of the response signals comprising a differentiated representation of the drive signal, an amplitude of each of the response signals being responsive to the coupling capacitance at the associated node; and a measurement unit configured to measure the amplitude of each of the response signals for each of the nodes, and to determine therefrom the positions of multiple temporally overlapping touches, if present, on the touch surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A touch-sensitive apparatus, comprising:
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a panel comprising a touch surface and a plurality of electrodes defining an electrode matrix, the electrode matrix being configured such that a touch on the touch surface proximate a given node of the matrix changes a coupling capacitance between two of the electrodes; a drive unit coupled to the electrode matrix and configured to generate a drive signal comprising one or more ramped pulses; a sense unit coupled to the electrode matrix and configured to generate, in response to the drive signal, at least one response signal that includes one or more rectangle pulses, an amplitude of the at least one response signal being responsive to a touch on the touch surface.
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Specification