TIME-REVERSAL-BASED IMPACT-LOCALIZATION AND HAPTIC-FEEDBACK METHOD FOR TOUCH PANELS

20120113020

13/030322

February 18, 2011

The present invention provides a time-reversal-based impact-localization and haptic-feedback method for touch panels. Firstly, a plate model for an elastic plate and the impulse responses thereof are constructed according a plate theory. Next, a mathematical model is established according to the impulse responses and a time-reversal approach. When an impact force hits the elastic plate, the touched point on the elastic plate generates a touch signal, and the touch signal is received by at least a sensor at the corner of the elastic plate. The touch signal is converted into a time-reversal signal according to the mathematical model by a simulator. The time-reversal signal is reversed to the touched point for simulating reversal vibration waves of the time-reversal signal on the elastic plate, and locating the touched point.

BAI, MINGSIAN R. (HSINCHU, TW); TSAI, YAO KUN (TAOYUAN COUNTY, TW)

NATIONAL CHIAO TUNG UNIVERSITY (HSINCHU CITY, TW)

1. A time-reversal-based impact-localization and haptic-feedback method for touch panels, comprising steps: constructing a plate model of an elastic plate according a plate theory; calculating an impulse response of an arbitrary point of said elastic plate; using a time-reversal approach to construct a mathematic model according to said impulse response; using at least one sensor at corner of said elastic plate to receive a touch signal generated via applying an external force to a touched point of said elastic plate; and using a simulator to convert said touch signal into a time-reversal signal according to said time-reversal approach and retransmit said time-reversal signal to said touched point to simulate a waveform of backward-propagation vibration and position said touched point.

2. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein said plate model is constructed according to a plurality of material parameters of said elastic plate, including thickness, unit impulse, density, and bending stiffness.

3. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 2, wherein said material parameters include a Young's modulus and a Poisson ratio of said elastic plate.

4. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein said plate model is an equation describing transverse displacement of said elastic plate receiving external force.

5. A time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein a convolution operation is used to work out said impulse response according to a count of said sensors and a count of said touched points on said elastic plate.

6. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein a position having a maximum transverse displacement in said waveform of backward-propagation vibration is said touched point.

7. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein retransmitting said time-reversal signal to said touched point generates a haptic feedback that induces said waveform of backward-propagation vibration.

8. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein said sensor is a piezoelectric sensor or a voice-coil sensor.

9. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein said elastic plate is made of glass, iron, copper or another material.

10. The time-reversal-based impact-localization and haptic-feedback method for touch panels according to claim 1, wherein said plate theory is the Kirchoff plate theory.

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edspap.20120113020