TOUCH DETECTION FOR TOUCH INPUT DEVICES
First Claim
1. A touch sensor panel adapted to compensate for received electromagnetic noise, the touch sensor panel comprising:
- a plurality of drive elements;
a plurality of sense elements in proximity to one or more of the drive elements and adapted to capacitively couple to one or more of the drive elements and detect touch events; and
one or more reference elements in proximity to one or more of the sense elements, the reference elements adapted for capacitively coupling electromagnetic noise.
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Accused Products
Abstract
Methods and apparatus for correcting electrical noise coupling from a liquid crystal module to a plurality of sense elements disposed within a touch sensor panel, and for reducing errors in touch detection algorithms. Erroneous signal values detected by the sense elements may be corrected by utilizing a set of reference elements for detecting noise common to both the sense elements and the reference elements, and a correction module for effectively subtracting out the noise from the sensed values. Errors in touch detection algorithms may be reduced by providing a more uniform spacing between successive sense elements. In some embodiments, one or more dummy ground elements may be inserted between adjacent sense elements in order to reduce signal interference.
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Citations
35 Claims
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1. A touch sensor panel adapted to compensate for received electromagnetic noise, the touch sensor panel comprising:
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a plurality of drive elements; a plurality of sense elements in proximity to one or more of the drive elements and adapted to capacitively couple to one or more of the drive elements and detect touch events; and one or more reference elements in proximity to one or more of the sense elements, the reference elements adapted for capacitively coupling electromagnetic noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of compensating for common mode noise in a touch sensor panel comprising a plurality of sense elements, the method comprising:
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providing one or more reference elements in a touch sensor panel, the one or more reference elements adapted for sensing the common mode noise; detecting a set of signals from said reference elements; and creating a correction value based at least in part upon the set of signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A touch sensor panel adapted to reduce errors in centroid detection, the touch sensor panel comprising:
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a plurality of sets of drive elements; and a sense element in proximity to each set of drive elements, wherein at least one sense element is adjacent to another sense element, and wherein each of the sense elements are evenly spaced. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A method for forming a touch sensor panel capable of reducing errors in centroid detection, comprising:
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arranging a plurality of sense elements in proximity to a plurality of drive elements on the touch sensor panel, the sense elements grouped in pairs and having even spacing with respect to each other; and forming a reference element between each pair of sense elements. - View Dependent Claims (30, 31, 32)
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33. A mobile telephone including a touch sensor panel adapted to compensate for received electromagnetic noise, the touch sensor panel comprising:
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a plurality of drive elements; a plurality of sense elements in proximity to one or more of the drive elements and adapted to capacitively couple to one or more of the drive elements and detect touch events; and one or more reference elements in proximity to one or more of the sense elements, the reference elements adapted for capacitively coupling electromagnetic noise.
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34. A digital media player including a touch sensor panel adapted to compensate for received electromagnetic noise, the touch sensor panel comprising:
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a plurality of drive elements; a plurality of sense elements in proximity to one or more of the drive elements and adapted to capacitively couple to one or more of the drive elements and detect touch events; and one or more reference elements in proximity to one or more of the sense elements, the reference elements adapted for capacitively coupling electromagnetic noise.
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35. A personal computer including a touch sensor panel adapted to compensate for received electromagnetic noise, the touch sensor panel comprising:
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a plurality of drive elements; a plurality of sense elements in proximity to one or more of the drive elements and adapted to capacitively couple to one or more of the drive elements and detect touch events; and one or more reference elements in proximity to one or more of the sense elements, the reference elements adapted for capacitively coupling electromagnetic noise.
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Specification