Touch sensitive displays
First Claim
1. A touch sensitive display comprising:
- a sensor having an input array of electrodes and an output array of electrodes, wherein the output array of electrodes is capacitively coupled to the input array of electrodes at a plurality of intersection points;
a controller operable to perform a scan operation at the plurality of intersection points of said input array using a plurality of base touch values and a predetermined proportional touch threshold, the plurality of base touch values reflecting touch-value variation at the plurality of intersection points when there is no touch event on the sensor;
wherein, for each intersection point of the plurality of intersection points, the scan operation comprises;
measuring a touch value for said intersection point;
determining a proportional difference between said touch value and a base touch value of the plurality of base touch values, wherein said proportional difference is determined based on the difference between said touch value and said base touch value as a proportion of said base touch value, wherein said base touch value is indicative of a touch-value measurement at said intersection point when there is no touch event on the sensor; and
comparing said proportional difference to said predetermined proportional touch threshold so as to determine whether there is a touch event at that point, wherein said predetermined proportional touch threshold is defined as the difference between a given touch value and a given base touch value, as a proportion of said given base touch value, indicative of there being a touch event.
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Accused Products
Abstract
Disclosed are a touch sensitive display and a method of operation thereof. The display comprises a sensor having an input put array of electrodes and, capacitively coupled thereto, an output array of electrodes and a controller operable to perform a scan operation at every intersection point of said input array. The scan operation comprises measuring a touch value for an intersection point; determining a proportional difference between said touch value and a base touch value for said intersection point as a proportion of said base touch value, wherein said base touch value is indicative of there being no touch event on the sensor; and comparing the proportional difference to a predetermined proportional touch threshold so as to determine whether there is a touch event at that point.
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Citations
19 Claims
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1. A touch sensitive display comprising:
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a sensor having an input array of electrodes and an output array of electrodes, wherein the output array of electrodes is capacitively coupled to the input array of electrodes at a plurality of intersection points; a controller operable to perform a scan operation at the plurality of intersection points of said input array using a plurality of base touch values and a predetermined proportional touch threshold, the plurality of base touch values reflecting touch-value variation at the plurality of intersection points when there is no touch event on the sensor; wherein, for each intersection point of the plurality of intersection points, the scan operation comprises; measuring a touch value for said intersection point; determining a proportional difference between said touch value and a base touch value of the plurality of base touch values, wherein said proportional difference is determined based on the difference between said touch value and said base touch value as a proportion of said base touch value, wherein said base touch value is indicative of a touch-value measurement at said intersection point when there is no touch event on the sensor; and comparing said proportional difference to said predetermined proportional touch threshold so as to determine whether there is a touch event at that point, wherein said predetermined proportional touch threshold is defined as the difference between a given touch value and a given base touch value, as a proportion of said given base touch value, indicative of there being a touch event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a touch sensitive display, said touch sensitive display comprising a sensor having an input array of electrodes and an output array of electrodes, wherein the output array of electrodes is capacitively coupled to the input array of electrodes at a plurality of intersection points, said method comprising:
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performing a scan operation at the plurality of intersection points of said input array using a plurality of base touch values and a predetermined proportional touch threshold, the plurality of base touch values reflecting touch-value variation at the plurality of intersection points when there is no touch event on the sensor; wherein, for each intersection point of the plurality of intersection points, the scan operation comprises; measuring a touch value for said intersection point; determining a proportional difference between said touch value and a base touch value of the plurality of base touch values, wherein said proportional difference is determined based on the difference between said touch value and said base touch value as a proportion of said base touch value, wherein said base touch value is indicative of there being no touch event on the sensor; and comparing said proportional difference to said predetermined proportional touch threshold so as to determine whether there is a touch event at that point, wherein said predetermined proportional touch threshold is defined as the difference between a given touch value and a given base touch value, as a proportion of said given base touch value, indicative of there being a touch event. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification