Calibration of force based touch panel systems
First Claim
1. A method for determining a touch location on a touch screen, the touch screen incorporating a plurality of touch sensors disposed to measure a signal indicative of a touch force component that is perpendicular to a touch surface, comprising:
- providing calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with torsion of the touch screen;
detecting a force responsive touch signal having the error; and
determining the touch location using the calibration parameters to compensate for the error in the touch signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system are provided to correct inaccuracies in touch location determination associated with mechanical distortion of the touch screen. Calibration parameters are provided for a touch screen characterizing an error in an expected touch signal associated with mechanical distortion of the touch screen. A force responsive touch signal having the error is detected and the touch location determined using the calibration parameters to correct the error in the touch signal. The calibration parameters are determined by applying mechanical distortion to the touch screen and characterizing the touch signal error associated with the mechanical distortion. The calibration parameters are produced using the characterization of the touch signal error
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Citations
49 Claims
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1. A method for determining a touch location on a touch screen, the touch screen incorporating a plurality of touch sensors disposed to measure a signal indicative of a touch force component that is perpendicular to a touch surface, comprising:
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providing calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with torsion of the touch screen; detecting a force responsive touch signal having the error; and determining the touch location using the calibration parameters to compensate for the error in the touch signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A touch screen system, comprising:
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a touch surface; a plurality of force responsive touch sensors, each of the touch sensors mechanically coupled to the touch surface and producing a sensor signal in response to a touch applied to the touch surface; and a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to provide calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with torsion of the touch screen, detect a force responsive touch signal having the error, and determine a touch location using the calibration parameters to compensate for the error in the touch signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A touch screen display system, comprising:
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a touch screen system, including;
a touch surface;a plurality of force responsive touch sensors, each of the touch sensors mechanically coupled to the touch surface and producing a sensor signal in response to a touch applied to the touch surface; and a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to provide calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with torsion of the touch screen, detect a force responsive touch signal having the error, and determine a touch location using the calibration parameters to compensate for the error in the touch signal; and a display for displaying information through the touch screen system. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A display system, comprising:
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a touch screen system, including a touch surface; a plurality of touch sensors, each of the touch sensors mechanically coupled to the touch surface and producing a sensor signal in response to a touch applied to the touch surface; and a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to provide calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with torsion of the touch screen, detect a force responsive touch signal having the error, and determine a touch location using the calibration parameters to compensate for the error in the touch signal; a display for displaying information; and a processor coupled to the display and the touch screen system for processing data to be displayed on the display and information received from the touch screen system. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A system for determining touch location on a touch screen, the touch screen defined by a plurality of touch sensors mechanically coupled to a touch surface, comprising:
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means for providing touch screen calibration parameters acquired using the touch surface and the touch sensors, the touch screen calibration parameters characterizing touch signal error associated with a mechanical distortion of the touch screen; means for detecting a touch signal having the touch signal error; means for correcting the touch signal using the touch screen calibration; and means for determining the touch location using the corrected touch signal; wherein means for providing the touch screen calibration parameters comprises means for providing a characterization of an effect of torsion on the touch screen. - View Dependent Claims (34, 35)
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36. A computer-readable medium configured with executable instructions for causing one or more computers to perform a method for determining a touch location on a touch screen, the touch screen defined by a plurality of touch sensors disposed to measure a signal indicative of a touch force component that is perpendicular to the touch screen, comprising:
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providing calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with torsion of the touch screen; detecting a force responsive touch signal having the error; and determining the touch location using the calibration parameters to compensate for the error in the touch signal.
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37. A method for determining a touch location on a touch screen, the touch screen incorporating a plurality of touch sensors disposed to measure a signal indicative of a touch force component that is perpendicular to a touch surface, comprising:
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providing calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with mechanical distortion of the touch screen, the calibration parameters determined by; applying two or more distortion conditions to the touch screen; detecting sensor signals corresponding to each distortion condition; and characterizing the error in the expected touch signal using the sensor signals corresponding to each distortion condition; detecting a force responsive touch signal having the error; and determining the touch location using the calibration parameters to compensate for the error in the touch signal. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. A touch screen system, comprising:
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a touch surface; a plurality of force responsive touch sensors, each of the touch sensors mechanically coupled to the touch surface and producing a sensor signal in response to a touch applied to the touch surface; and a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to provide calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with mechanical distortion of the touch screen, detect a force responsive touch signal having the error, and determine a touch location using the calibration parameters to compensate for the error in the touch signal, the calibration parameters determined by; applying two or more distortion conditions to the touch screen; detecting sensor signals corresponding to each distortion condition; and characterizing the error in the expected touch signal suing the sensor signals corresponding to each distortion condition.
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45. A touch screen system, comprising:
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a touch surface; a plurality of force responsive touch sensors, each of the touch sensors mechanically coupled to the touch surface and producing a sensor signal in response to a touch applied to the touch surface; and a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to provide calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with mechanical distortion of the touch screen, detect a force responsive touch signal having the error, and determine a touch location using the calibration parameters to compensate for the error in the touch signal, the calibration parameters comprising one or more distortion corrected calibration vectors.
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46. A touch screen display system, comprising:
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a touch screen system, including;
a touch surface;a plurality of force responsive touch sensors, each of the touch sensors mechanically coupled to the touch surface and producing a sensor signal in response to a touch applied to the touch surface; and a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to provide calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with mechanical distortion of the touch screen, detect a force responsive touch signal having the error, and determine a touch location using the calibration parameters to compensate for the error in the touch signal, the calibration parameters determined by; applying two or more distortion conditions to the touch screen; detecting sensor signals corresponding to each distortion condition; and characterizing the error in the expected touch signal suing the sensor signals corresponding to each distortion condition; and a display for displaying information through the touch screen system.
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47. A display system, comprising:
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a touch screen system, including a touch surface; a plurality of touch sensors, each of the touch sensors mechanically coupled to the touch surface and producing a sensor signal in response to a touch applied to the touch surface; and a control system, coupled to the touch sensors and receiving the sensor signals, the control system configured to provide calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with mechanical distortion of the touch screen, detect a force responsive touch signal having the error, and determine a touch location using the calibration parameters to compensate for the error in the touch signal, the calibration parameters determined by; applying two or more distortion conditions to the touch screen; detecting sensor signals corresponding to each distortion condition; and characterizing the error in the expected touch signal using the sensor signals corresponding to each distortion condition; a display for displaying information; and a processor coupled to the display and the touch screen system for processing data to be displayed on the display and information received from the touch screen system.
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48. A system for determining touch location on a touch screen, the touch screen defined by a plurality of touch sensors mechanically coupled to a touch surface, comprising:
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means for providing touch screen calibration parameters acquired using the touch surface and the touch sensors, the touch screen calibration parameters characterizing touch signal error associated with a mechanical distortion of the touch screen; means for detecting a touch signal having the touch signal error; means for correcting the touch signal using the touch screen calibration; and means for determining the touch location using the corrected touch signal; wherein means for providing the touch screen calibration parameters comprises means for providing one or more torsion corrected calibration vectors.
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49. A computer-readable medium configured with executable instructions for causing one or more computers to perform a method for determining a touch location on a touch screen, the touch screen defined by a plurality of touch sensors disposed to measure a signal indicative of a touch force component that is perpendicular to the touch screen, comprising:
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providing calibration parameters for the touch screen acquired using the touch sensors and the touch surface, the calibration parameters characterizing an error in an expected touch signal associated with mechanical distortion of the touch screen, the calibration parameters determined by; applying two or more distortion conditions to the touch screen; detecting sensor signals corresponding to each distortion condition; and characterizing the error in the expected touch signal using the sensor signals corresponding to each distortion condition; detecting a force responsive touch signal having the error; and determining the touch location using the calibration parameters to compensate for the error in the touch signal.
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Specification