Touch detection for a digitizer
First Claim
1. A detector for providing position detection of a first kind together with position detection of a second kind the detector comprising:
- a sensor, a patterned arrangement of sensing conductors extending within said sensor, and detection circuitry associated with said arrangement for detecting signals at same sensing conductors arising from said position detection of a first kind and signals arising from said position detection of a second kind, therefrom to detect positions at said sensor.
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Accused Products
Abstract
A detector for detecting touches by fingers or like body parts on a sensor comprises at least one sensing conductor, typically a grid of such conductors, extending into the sensor, a source of oscillating electrical energy at a predetermined frequency, and detection circuitry for detecting a capacitive influence on the sensing conductor when said oscillating electrical energy is applied, the capacitive influence being interpreted as a touch. The detector is advantageous in that the same sensing conductors can be used both for touch sensing and for detection of an electromagnetic stylus.
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Citations
49 Claims
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1. A detector for providing position detection of a first kind together with position detection of a second kind the detector comprising:
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a sensor, a patterned arrangement of sensing conductors extending within said sensor, and detection circuitry associated with said arrangement for detecting signals at same sensing conductors arising from said position detection of a first kind and signals arising from said position detection of a second kind, therefrom to detect positions at said sensor. - 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 detector for detecting touches by conductive objects making capacitive contact with a transparent sensor located over a display screen, the detector comprising:
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a patterned arrangement of sensing conductors extending into said sensor, a source of oscillating electrical energy at a predetermined frequency, and detection circuitry for detecting a capacitive influence on said at least one sensing conductor when said oscillating electrical energy is applied. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of touch sensing at a matrix of sensing conductors located in a transparent sensor over an electronic display screen, comprising:
providing an oscillating signal at a predetermined frequency, and measuring said conductors for capacitive effects on said conductors due to touch thereon. - View Dependent Claims (40, 41, 42, 43, 44)
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45. A method of manufacture of a touch detector for an electronic display screen, comprising:
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providing an oscillation signal source, embedding a grid of transparent conductors within at least one transparent foil, placing said transparent foil over said electronic display screen, and providing detection circuitry for detecting capacitive effects on said conductors. - View Dependent Claims (46)
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47. Touch detection apparatus comprising:
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a sensor comprising at least one sensing conductive element, an oscillator for providing an oscillation signal, a transmitter, associated with said oscillator, for transmitting said oscillation signal in the vicinity of said sensor, sensing circuitry for sensing a signal at said at least one sensing conductive element induced by a touch of a conductive object subjected to said transmitted oscillated signal.
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48. Touch detection apparatus comprising:
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a sensor comprising a grid array of conductors in a first sense and conductors in a second sense and having junctions therebetween, an oscillator for providing an oscillation signal to conductors in said first sense, detection circuitry for detecting said oscillation signal when transferred via said junctions to conductors in said second sense, said transference being indicative of capacitive coupling induced by a touch of a conductive object touching said sensor at a respective junction.
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49. Touch detection apparatus comprising:
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a sensor comprising at least one sensing conductive element, an oscillator for providing an oscillation signal, said oscillation signal being applied to at least part of said apparatus including said at least one sensing conductive element, and detection circuitry for detecting a.c. grounding of said at least one sensing conductive element due to a capacitive connection to a conductive object touching said sensor.
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Specification