TWO-DIMENSIONAL POSITION SENSOR
First Claim
1. A device comprising:
- a plurality of bar shaped drive electrodes formed in a first layer of a capacitive sensor;
a plurality of bar shaped sense electrodes adjacent the drive electrodes in the first layer of the capacitive sensor, wherein at least two of the drive or sense electrodes are each separated into at least three segments; and
a plurality of tracks adjacent the drive and sense electrodes to selectively couple segments from the at least two segmented drive or sense electrodes.
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Accused Products
Abstract
A capacitive position sensor is provided having a touch-sensitive area defined by a single-layer of electrodes arranged in a pattern along two axes. The electrode pattern includes a plurality of units each occupying a portion of the touch sensitive area along one axis. Each unit has at least three lines of elongate electrodes spaced apart in the one axis and extending for a length parallel to the other axis. The three lines of elongate electrodes in each unit comprise at least one line of drive electrodes and two lines of sense electrodes or at least one line of sense electrodes and two lines of drive electrodes. Selected electrodes of each unit are arranged in interconnected groups, each group having electrodes from more than one line which have partially overlapping extents along their length.
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Citations
23 Claims
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1. A device comprising:
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a plurality of bar shaped drive electrodes formed in a first layer of a capacitive sensor; a plurality of bar shaped sense electrodes adjacent the drive electrodes in the first layer of the capacitive sensor, wherein at least two of the drive or sense electrodes are each separated into at least three segments; and a plurality of tracks adjacent the drive and sense electrodes to selectively couple segments from the at least two segmented drive or sense electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A capacitive position sensor having a touch-sensitive area defined by a single-layer of electrodes arranged in a pattern along first and second axes, the pattern comprising a plurality of units each occupying a portion of the touch sensitive area along the second axis, and each unit comprising at least three lines of elongate electrodes extending parallel to the first axis and spaced apart in the second axis, there being at least one line of drive electrodes and two lines of sense electrodes per unit, wherein the sense electrodes of each unit are arranged in interconnected groups, each group having sense electrodes from more than one line which have partially overlapping extents along the first axis.
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16. A method comprising:
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applying drive signals to longitudinal drive electrodes in a first layer of a capacitive sensor; measuring sense signals received from each group of a plurality of longitudinal segmented sense electrodes adjacent the drive electrodes, the sense signals representing a degree of capacitive coupling of the drive signals between the drive electrodes and each group of the sense electrodes; determining position in the first axis by an interpolation between sense signals obtained from the sense electrodes of each group of sense electrodes; and determining position in the second axis by an interpolation between sense signals obtained by sequentially driving the drive electrodes with respective drive signals.
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- 17. A capacitive position sensor having a touch-sensitive area defined by a single-layer of electrodes arranged in a pattern along first and second axes, the pattern comprising a plurality of units each occupying a portion of the touch sensitive area along the first axis, and each unit comprising at least three lines of elongate electrodes extending parallel to the second axis and spaced apart in the first axis, there being at least one line of sense electrodes and two lines of drive electrodes per unit, wherein the drive electrodes of each unit are arranged in interconnected groups, each group having at least two drive electrodes from more than one line which have the same extents along the second axis and are co-terminus.
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23. A method of sensing position of an actuation on a capacitive position sensor having a touch-sensitive area defined by a single-layer of electrodes arranged in a pattern along first and second axes, the pattern comprising a plurality of units each occupying a portion of the touch sensitive area along the first axis, and each unit comprising at least three lines of elongate electrodes extending parallel to the second axis and spaced apart in the first axis, there being at least one line of sense electrodes and two lines of drive electrodes per unit, wherein the drive electrodes of each unit are arranged in interconnected groups, each group having at least two drive electrodes from more than one line which have the same extents along the second axis and are co-terminus, the method comprising:
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applying drive signals to the drive electrodes; measuring sense signals received from each sense electrode representing a degree of capacitive coupling of the drive signals between the drive electrodes and each of the sense electrodes; determining position in the first axis by an interpolation between sense signals obtained from the sense electrodes of each sense electrode; and determining position in the second axis by an interpolation between sense signals obtained by sequentially driving the groups of drive electrodes with respective drive signals.
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Specification