Touch sensing with touch down and lift off sensitivity
First Claim
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1. A touch sensing device, comprising:
- a touch panel;
a transducer coupled to the touch panel and configured to induce bending waves in the touch panel;
a plurality of sensors coupled to the touch panel, the plurality of sensors configured to sense the induced bending waves and generate an untouched condition signal responsive to the induced bending waves, the plurality of sensors further configured to sense bending waves modified by a touch on the touch panel and to generate a bending wave signal responsive to the bending waves modified by the touch; and
a controller coupled to the plurality of sensors, the controller configured to compare the untouched condition signal to the bending wave signal after the signals are corrected for frequency dispersion, and to detect a touch on the touch panel based on the comparison.
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Abstract
A touch sensing device includes a plurality of sensors and an emitting transducer coupled to a touch panel. The transducer induces bending waves in the touch panel. The sensors sense bending waves in the touch panel and generate a bending wave signal responsive to the sensed bending waves. A controller identifies an untouched condition signal responsive to the induced bending waves. The controller compares the untouched condition signal to the bending wave signal, and detects a touch on the touch panel based on the comparison.
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Citations
19 Claims
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1. A touch sensing device, comprising:
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a touch panel; a transducer coupled to the touch panel and configured to induce bending waves in the touch panel; a plurality of sensors coupled to the touch panel, the plurality of sensors configured to sense the induced bending waves and generate an untouched condition signal responsive to the induced bending waves, the plurality of sensors further configured to sense bending waves modified by a touch on the touch panel and to generate a bending wave signal responsive to the bending waves modified by the touch; and a controller coupled to the plurality of sensors, the controller configured to compare the untouched condition signal to the bending wave signal after the signals are corrected for frequency dispersion, and to detect a touch on the touch panel based on the comparison. - View Dependent Claims (6)
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2. A touch sensing device, comprising:
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a touch panel; a transducer coupled to the touch panel and configured to induce bending waves in the touch panel, the transducer being configured to induce bending waves in the touch panel at a frequency greater than or equal to half the sampling frequency used by the controller; a plurality of sensors coupled to the touch panel, the plurality of sensors configured to sense the induced bending waves and generate an untouched condition signal responsive to the induced bending waves, the plurality of sensors further configured to sense bending waves modified by a touch on the touch panel and to generate a bending wave signal responsive to the bending waves modified by the touch; and a controller coupled to the plurality of sensors, the controller configured to compare the untouched condition signal to the bending wave signal after the signals are corrected for frequency dispersion, and to detect a touch on the touch panel based on the comparison.
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3. A touch sensing device, comprising:
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a touch panel; a transducer coupled to the touch panel and configured to induce bending waves in the touch panel, the transducer being configured to induce bending waves in the touch panel at a frequency associated with an aliased untouched condition signal; a plurality of sensors coupled to the touch panel, the plurality of sensors configured to sense the induced bending waves and generate an untouched condition signal responsive to the induced bending waves, the plurality of sensors further configured to sense bending waves modified by a touch on the touch panel and to generate a bending wave signal responsive to the bending waves modified by the touch; and a controller coupled to the plurality of sensors, the controller configured to compare the untouched condition signal to the bending wave signal after the signals are corrected for frequency dispersion, and to detect a touch on the touch panel based on the comparison. - View Dependent Claims (4, 5)
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7. A touch system, comprising:
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a touch screen, comprising; a touch panel; a transducer coupled to the touch panel and configured to induce bending waves in the touch panel; a plurality of sensors coupled to the touch panel, the plurality of sensors configured to sense the induced bending waves and generate an untouched condition signal responsive to the induced bending waves, the plurality of sensors further configured to sense bending waves modified by a touch on the touch panel and to generate a bending wave signal responsive to the bending waves modified by the touch; and a controller coupled to the plurality of sensors, the controller configured to compare the untouched condition signal to the bending wave signal after correcting the signals for frequency dispersion, and detect a touch on the touch panel based on the comparison; a display viewable through the touch screen and configured to display information; and a processor coupled to the display and configured to process the information to be displayed on the display. - View Dependent Claims (8)
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9. A method for determining touch information, comprising:
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inducing bending waves in a touch panel using a driving signal; generating an untouched condition signal associated with the induced bending waves; generating a bending wave signal modified by a touch on the touch panel; comparing the bending wave signal and the untouched condition signal after the signals are corrected for frequency dispersion; and detecting the touch on the touch panel based on the comparison. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A touch sensing method, comprising:
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detecting a touch on a touch panel by one or more of a plurality of touch detection processes, at least one of the plurality of touch detection processes based on a signal generated in response to a bending wave induced in the touch panel by a driving signal and corrected for frequency dispersion; and initiating a touch location process after detecting the touch; wherein the at least one touch detection process comprises; generating a bending wave signal modified by a touch on the touch panel; comparing the bending wave signal and the signal generated by the induced bending wave after the signals are corrected for frequency dispersion; and detecting the touch on the touch panel based on the comparison. - View Dependent Claims (18, 19)
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Specification