Multiple electrode touch sensitive device
First Claim
1. A controller comprising:
- a driver to provide signals to drive electrodes of a touch sensitive device, wherein the driver provides multiple sets of drive signals to at least four different drive lines to separately couple to both ends of two sets of electrodes having electric field gradients and wherein the sets of electrodes are arranged generally perpendicular to each other and to exchange signals;
a receiver to receive multiple sets of exchanged signals from both sets of electrodes responsive to the signals provided by the driver; and
wherein the driver provides drive signals in the form of bursts of pulses and the pulses are provided in at least six different sets bursts corresponding to at least six different measurements.
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Accused Products
Abstract
Two different sets of electrodes in a touch sensitive device are formed to produce an electric field gradient from one end of the electrodes to the other end when opposite ends of the electrodes are driven with different voltages. A signal measuring cycle is performed by alternately driving the ends of one set of electrodes, while using the other set of electrodes to receive signals. The roles of the sets of electrodes are then reversed, such that the set that that was driven is now used to receive signals from the other set of electrodes. Reference signals may be obtained by driving both sides of one set of electrodes, and then both sides of the other set of electrodes. The signals obtained are then used to determine the touch position on the touch sensitive device.
33 Citations
10 Claims
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1. A controller comprising:
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a driver to provide signals to drive electrodes of a touch sensitive device, wherein the driver provides multiple sets of drive signals to at least four different drive lines to separately couple to both ends of two sets of electrodes having electric field gradients and wherein the sets of electrodes are arranged generally perpendicular to each other and to exchange signals; a receiver to receive multiple sets of exchanged signals from both sets of electrodes responsive to the signals provided by the driver; and wherein the driver provides drive signals in the form of bursts of pulses and the pulses are provided in at least six different sets bursts corresponding to at least six different measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification