Multiple touch location in a three dimensional touch screen sensor
First Claim
1. A touch pad or touch screen capable of correctly identifying dual-touch inputs comprising:
- a first array of active lines for capacitance measurement;
a second array of active lines for capacitance measurement wherein the first array and the second array intersect forming a plurality of intersections; and
a third array of active lines for capacitance measurement wherein active lines of the third array are oriented so as to traverse the plurality of intersections distinct from active lines from the first array and from active lines from the second array,wherein correct coordinates of possible combinations from a dual-touch input are identified by comparing coordinate combinations from an expression wherein a first array coordinate is an additive function of a second array coordinate and a third array coordinate.
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Abstract
A touch screen capable of correctly identifying multiple touches employs multiple active line arrays oriented to provide multi-dimensional data. Three arrays of capacitance based active lines are each distinctly oriented to form a plurality of intersections. A first and second array are generally oriented perpendicularly while a third array is oriented to bisect the resulting matrix such that the active lines of the third array also intersect the existing vertices. As a result of a touch each active line array identifies the location of the touch from three distinct directions. Ambiguity from dual touch scenarios existing in dual array systems is removed by providing an additional reference.
18 Citations
22 Claims
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1. A touch pad or touch screen capable of correctly identifying dual-touch inputs comprising:
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a first array of active lines for capacitance measurement; a second array of active lines for capacitance measurement wherein the first array and the second array intersect forming a plurality of intersections; and a third array of active lines for capacitance measurement wherein active lines of the third array are oriented so as to traverse the plurality of intersections distinct from active lines from the first array and from active lines from the second array, wherein correct coordinates of possible combinations from a dual-touch input are identified by comparing coordinate combinations from an expression wherein a first array coordinate is an additive function of a second array coordinate and a third array coordinate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for multi-touch location identification in a touch pad or touch screen, the method comprising:
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monitoring capacitance of each of a plurality of active lines in three or more active line arrays; measuring raised active line capacitance levels indicative of at least one touch; identifying one or more possible touch point coordinate combinations based on raised active line capacitance levels from each active line array; and determining valid touch point coordinate combinations, wherein correct coordinates of possible combinations from a dual-touch input are identified by comparing coordinate combinations from an expression wherein a first array coordinate is an additive function of a second array coordinate and a third array coordinate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. In a touch pad or touch screen, a method of correctly identifying dual-touch inputs comprising:
- providing a first array of active lines for capacitance measurement;
providing a second array of active lines for capacitance measurement wherein the first array and the second array intersect forming a plurality of intersections;
providing a third array of active lines for capacitance measurement wherein active lines of the third array are oriented so as to traverse the plurality of intersections distinct from active lines from the first array and from active lines from the second array; and
identifying correct coordinates of possible combinations from a dual-touch input by comparing coordinate combinations from an expression wherein a first array coordinate is an additive function of a second array coordinate and a third array coordinate.
- providing a first array of active lines for capacitance measurement;
Specification