Touch detection for a digitizer
First Claim
Patent Images
1. A method of touch detection at a matrix of conductors located in a transparent sensor, the matrix of conductors including a first and a second sets of conductors forming a grid with a plurality of junctions at which the conductors do not contact, the method comprising:
- providing an oscillating signal to conductors from the first set of conductors, anddetecting said oscillation signal when transferred via said junctions to said conductors from second set of conductors, said transference being indicative of capacitive effects on said conductors due to touch of an object on the sensor at a respective junction.
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Abstract
A detector for detecting touches of at least one object on a transparent sensor located over a display screen, the detector comprising. a display screen; a patterned arrangement of conductors extending into said sensor situated over said display screen; and detection circuitry adapted to detect capacitive coupling of said at least one object with said at least one conductor.
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Citations
29 Claims
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1. A method of touch detection at a matrix of conductors located in a transparent sensor, the matrix of conductors including a first and a second sets of conductors forming a grid with a plurality of junctions at which the conductors do not contact, the method comprising:
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providing an oscillating signal to conductors from the first set of conductors, and detecting said oscillation signal when transferred via said junctions to said conductors from second set of conductors, said transference being indicative of capacitive effects on said conductors due to touch of an object on the sensor at a respective junction. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Touch detection apparatus comprising:
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a transparent sensor comprising a grid array of conductors in a first direction and conductors in a second direction, having plurality of junctions at which the conductors do not contact; and an oscillator capable of providing an oscillation signal to conductors in said first direction, detection circuitry adapted to detect said oscillation signal when transferred via said junctions to conductors in said second direction, said transference being indicative of capacitive coupling induced by a touch of an object touching said sensor at a respective junction. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A multi-touch detection apparatus comprising:
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a sensor including a first and second set of conductor lines forming a grid with a plurality of junctions therebetween; circuitry operative to apply signals to conductor lines from one of the first or second set of conductor lines; circuitry operative to detect outputs from conductor lines from the other set of conductor lines in response to a signal applied to at least one conductor line, wherein each of said outputs is indicative of a level of capacitive coupling formed between the at least one conductor line on which a signal is applied and conductor lines on which output is detected; and a detector operative to distinguish between more than one finger touch at the same time based on the outputs, wherein the sensor is substantially transparent and suitable for positioning over an electronic display. - View Dependent Claims (27)
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28. A method for multi-touch detection, the method comprising:
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providing a sensor including a first and second set of conductor lines forming a grid with a plurality of junctions therebetween, applying a signal to at least one conductor line from the first set of conductor lines; detecting outputs from conductor lines from the second set of conductor lines in response to the applied signal, wherein each of the outputs is responsive to a level of capacitive coupling formed between the at least one conductor line from the first set and a conductor line from the second set; and distinguishing more than one finger touch interacting with the sensor at the same time based on the outputs, wherein a detection area of the sensor is substantially transparent so as to be suitable for positioning over an electronic display. - View Dependent Claims (29)
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Specification