TACTILE FEEDBACK GENERATED BY NON-LINEAR INTERACTION OF SURFACE ACOUSTIC WAVES

摘要

Described embodiments include a system and a method. A system includes a first ultrasound transmitter acoustically coupled to a conducting layer of a display surface and configured to deliver a first ultrasound wave to a selected delineated area. The first ultrasonic wave has parameters sufficient to induce a non-linear vibrational response in the conducting layer. A second ultrasound transmitter is acoustically coupled to the conducting layer and configured to deliver a second ultrasound wave to the selected delineated area. The second ultrasonic wave has parameters sufficient to induce a non-linear vibrational response in the conducting layer. A controller selects a delineated area in response to an indication of a touch to the display surface, and initiates delivery of the first and second ultrasonic waves. A convergence of the first and second ultrasonic waves at the selected delineated area produces a stress pattern perceivable or discernible by the human appendage.

主权项

1. A system comprising:
a first ultrasound transmitter acoustically coupled to an ultrasound-conducting layer of a display surface and configured to deliver a first ultrasound wave to a delineated area selected from at least two delineated areas of the display surface, the first ultrasonic wave having a first carrier frequency and amplitude sufficient to induce a non-linear vibrational response of the ultrasound-conducting layer; a second ultrasound transmitter acoustically coupled to the ultrasound-conducting layer and configured to deliver a second ultrasound wave to the selected delineated area, the second ultrasonic wave having a second carrier frequency and amplitude sufficient to induce a non-linear vibrational response of the ultrasound-conducting layer; and a controller configured to select a delineated area from the at least two delineated areas in response to an indication of a location of a detected touch by a human appendage to the display surface, and to initiate a delivery of the first ultrasonic wave by the first ultrasound transmitter and a delivery of the second ultrasonic wave by the second ultrasound transmitter to the selected delineated area, the parameters of the first carrier frequency and amplitude and second carrier frequency and amplitude are such that a non-linear interaction of the first ultrasound wave and the second ultrasound wave at the selected delineated area produces a stress pattern having a different frequency, the different frequency being directly perceivable or discernible by the human appendage.