Multiple electrode touch sensitive device
First Claim
1. A touch sensor comprising:
- a plurality of drive electrodes each coupled to an adjacent drive electrode; and
a plurality of sense electrodes each coupled to an adjacent sense electrode;
a microcontroller configured to alternately reverse the roles of the plurality of drive electrodes and the plurality of sense electrodes by;
applying a signal at one end of the plurality of drive electrodes to drive the plurality of drive electrodes while the plurality of sense electrodes receive signals; and
applying a signal at one end of the plurality of sense electrodes to drive the plurality of sense electrodes while the plurality of drive electrodes receive signals.
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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.
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Citations
21 Claims
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1. A touch sensor comprising:
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a plurality of drive electrodes each coupled to an adjacent drive electrode; and a plurality of sense electrodes each coupled to an adjacent sense electrode; a microcontroller configured to alternately reverse the roles of the plurality of drive electrodes and the plurality of sense electrodes by; applying a signal at one end of the plurality of drive electrodes to drive the plurality of drive electrodes while the plurality of sense electrodes receive signals; and applying a signal at one end of the plurality of sense electrodes to drive the plurality of sense electrodes while the plurality of drive electrodes receive signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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a touch sensor comprising; a plurality of drive electrodes each coupled to an adjacent drive electrode; and a plurality of sense electrodes each coupled to an adjacent sense electrode; and a computer-readable non-transitory storage medium embodying logic that is configured when executed to control the touch sensor; and a microcontroller configured to alternately reverse the roles of the plurality of drive electrodes and the plurality of sense electrodes by; applying a signal at one end of the plurality of drive electrodes to drive the plurality of drive electrodes while the plurality of sense electrodes receive signals; and applying a signal at one end of the plurality of sense electrodes to drive the plurality of sense electrodes while the plurality of drive electrodes receive signals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for controlling a touch screen, comprising:
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coupling each of a plurality of drive electrodes formed on a first layer of the touch screen to at least one adjacent drive electrode; and coupling each of a plurality of sense electrodes formed on the first layer of the touch screen to at least one adjacent sense electrode; and alternately reversing, by a microcontroller, the roles of the plurality of drive electrodes and the plurality of sense electrodes by; applying a first signal at one end of a plurality of drive electrodes to drive the plurality of drive electrodes while the plurality of sense electrodes receive signals; and applying a second signal at one end of the plurality of sense electrodes to drive the plurality of sense electrodes while the plurality of drive electrodes receive signals. - View Dependent Claims (18, 19, 20, 21)
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Specification