Methods and systems for detecting a position-based attribute of an object using digital codes
First Claim
1. A method of detecting a position-based attribute of an object with respect to a touch-sensitive region comprising a plurality of electrodes, the method comprising the steps of:
- producing a plurality of distinct digital codes used to create a plurality of modulation signals applied to an associated at least one of the plurality of electrodes to obtain a resultant signal that is electrically affected by the position of the object;
demodulating the resultant signal using the plurality of distinct digital codes to thereby discriminate electrical effects produced by the object; and
determining the position-based attribute of the object with respect to the plurality of electrodes from the electrical effects.
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Accused Products
Abstract
Methods, systems and devices are described for detecting a position-based attribute of a finger, stylus or other object with a touchpad or other sensor having a touch-sensitive region that includes a plurality of electrodes. Modulation signals for one or more electrodes are produced as a function of any number of distinct digital codes. The modulation signals are applied to an associated at least one of the plurality of electrodes to obtain a resultant signal that is electrically affected by the position of the object. The resultant signal is demodulated using the plurality of distinct digital codes to discriminate electrical effects produced by the object. The position-based attribute of the object is then determined with respect to the plurality of electrodes from the electrical effects.
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Citations
51 Claims
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1. A method of detecting a position-based attribute of an object with respect to a touch-sensitive region comprising a plurality of electrodes, the method comprising the steps of:
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producing a plurality of distinct digital codes used to create a plurality of modulation signals applied to an associated at least one of the plurality of electrodes to obtain a resultant signal that is electrically affected by the position of the object;
demodulating the resultant signal using the plurality of distinct digital codes to thereby discriminate electrical effects produced by the object; and
determining the position-based attribute of the object with respect to the plurality of electrodes from the electrical effects. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A touch-sensitive device for detecting a position-based attribute of an object, the device comprising:
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a touch-sensitive region comprising a plurality of electrodes having electrical characteristics configured to be affected by the proximity of the object;
drive circuitry associated with each of the electrodes;
a demodulator coupled to the touch-sensitive region; and
a processor coupled to the drive circuitry and to the demodulator, wherein the processor is configured to initiate production of a plurality of modulation signals as a function of a plurality of distinct digital codes, to initiate application of each of the plurality of modulation signals to said plurality of electrodes via the drive circuitry, to demodulate a sensed signal received from said sensing region using the digital codes to discriminate electrical effects produced by the object upon at least one sensing electrode, and to determine the position-based attribute of the object with respect to the plurality of electrodes from the electrical effects. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A device for detecting a position-based attribute of an object with respect to a touch-sensitive region comprising a plurality of electrodes, the device comprising:
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means for producing a plurality of distinct digital codes used to create a plurality of modulation signals applied to an associated at least one of the plurality of electrodes to obtain a resultant signal that is electrically affected by the position of the object;
means for demodulating the resultant signal using the plurality of distinct digital codes to thereby discriminate electrical effects produced by the object; and
means for determining the position-based attribute of the object with respect to the plurality of electrodes from the electrical effects.
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Specification