TOUCH LOCATION SENSING SYSTEM AND METHOD EMPLOYING SENSOR DATA FITTING TO A PREDEFINED CURVE
First Claim
1. A detection method for use in a touch location sensing device comprising a capacitive touch sensor having a touch surface, the method comprising:
- developing touch signals at the touch sensor in response to a touch implement on or near the touch surface;
fitting data associated with the touch signals to a predefined curve, the predefined curve defined by a charged sphere near a conducting plane, the charged sphere representative of an end of the touch implement and the conducting plane representative of the touch surface; and
determining a location of the touch implement relative to the touch surface using the predefined curve to which the data is fitted.
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Accused Products
Abstract
Methods and devices for determining the location of a touch implement relative to a touch locating sensing device involve developing touch signals at a touch sensor in response to a touch implement on or near the touch surface. Data associated with the touch signals is fitted to a predefined curve. The predefined curve is preferably defined by a charged sphere near a conducting plane, the charged sphere representative of an end of the touch implement and the conducting plane representative of the touch surface. A location of the touch implement is determined relative to the touch surface using the predefined curve to which the data is fitted.
192 Citations
34 Claims
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1. A detection method for use in a touch location sensing device comprising a capacitive touch sensor having a touch surface, the method comprising:
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developing touch signals at the touch sensor in response to a touch implement on or near the touch surface; fitting data associated with the touch signals to a predefined curve, the predefined curve defined by a charged sphere near a conducting plane, the charged sphere representative of an end of the touch implement and the conducting plane representative of the touch surface; and determining a location of the touch implement relative to the touch surface using the predefined curve to which the data is fitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. The method of claim I, wherein the touch implement comprises an untethered battery-less stylus, the method further comprising:
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generating a drive signal at the touch location sensing device; energizing the stylus using the drive signal; transmitting a stylus signal from the energized stylus to the touch sensor; developing stylus touch signals at the touch sensor in response to the stylus signal; and determining a location of the stylus relative to the touch surface using the predefined curve to which data associated with the stylus touch signals is fitted. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A touch location sensing device, comprising:
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a touch sensor comprising a touch surface and one or more transducers configured to generate touch signals responsive to a touch implement on or near the touch surface; and a processor coupled to the touch sensor, the processor configured to fit data associated with the touch signals with a predefined curve, the predefined curve defined by a charged sphere near a conducting plane, the charged sphere representative of an end of the touch implement and the conducting plane representative of the touch surface, the processor further configured to determine a location of the touch implement relative to the touch surface using the predefined curve to which the data is fitted. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A touch location sensing device, comprising:
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means for developing touch signals at the touch sensor in response to a touch implement on or near the touch surface; means for fitting data associated with the touch signals to a predefined curve, the predefined curve defined by a charged sphere near a conducting plane, the charged sphere representative of an end of the touch implement and the conducting plane representative of the touch surface; and means for determining a location of the touch implement relative to the touch surface using the predefined curve to which the data is fitted. - View Dependent Claims (33, 34)
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Specification