Acoustic Touch Apparatus And Methods Using Touch Sensitive Lamb Waves
First Claim
1. A touch apparatus, comprising:
- a substrate having a front surface with a touch region and a back surface, the touch apparatus configured to propagate surface acoustic waves on at least a portion of the back surface and near-longitudinal-resonance Lamb waves in at least a portion of the touch region of the substrate.
4 Assignments
0 Petitions
Accused Products
Abstract
Systems and related methods providing for touch sensors using high sensitivity Lamb waves are disclosed herein. A touch apparatus may include a substrate having a front surface and a back surface, where the touch region is on the front surface. The touch apparatus may be configured to propagate surface acoustic waves on at least a portion of the back surface and high sensitivity lamb waves, such as near-longitudinal-resonance Lamb waves, in at least a portion of the touch region of the substrate. The touch system may further include circuitry configured to determine a location of a touch on the front surface based on received attenuations in the high sensitivity Lamb waves. Some embodiments may provide for bezel-less touch sensor designs and anti-dispersion techniques that enhance touch sensor reliability.
-
Citations
53 Claims
-
1. A touch apparatus, comprising:
a substrate having a front surface with a touch region and a back surface, the touch apparatus configured to propagate surface acoustic waves on at least a portion of the back surface and near-longitudinal-resonance Lamb waves in at least a portion of the touch region of the substrate. - View Dependent Claims (2, 3, 4, 5, 7, 8, 17)
-
6. (canceled)
-
9-16. -16. (canceled)
-
18-30. -30. (canceled)
-
31. A method of detecting a location of a touch on an acoustic touch apparatus, comprising:
-
generating an electrical excitation signal; sending the electrical excitation signal to a transmitting transducer disposed on a back surface of a substrate, the transmitting transducer configured to transform the electrical excitation signal to an acoustic wave that couples to the substrate as a surface acoustic wave; receiving an electrical return signal from a receiving transducer disposed on the back surface of the substrate, the receiving transducer configured to transform the acoustic wave into the electrical return signal, wherein the electrical return signal represents the acoustic wave including an attenuation that occurs from a touch on a front surface of the substrate while propagating through a touch region of the substrate as a near-longitudinal-resonance Lamb wave; and determining a location of the touch based on the electrical return signal. - View Dependent Claims (32, 33, 34, 35, 37, 38, 48)
-
-
36. (canceled)
-
39-47. -47. (canceled)
-
49. A touch apparatus, comprising:
-
a substrate having a front surface and a back surface, the substrate configured to propagate near-longitudinal-resonance Lamb waves; and one or more mode conversion arrays disposed on the back surface of the substrate configured to coherently scatter surface acoustic waves into the near-longitudinal-resonance Lamb waves. - View Dependent Claims (50, 51, 52)
-
-
53. (canceled)
Specification