Today Apple was granted a patent titled “Ultrasonic touch detection through display” Apple’s granted patent relates to system architectures, apparatus and methods for acoustic touch detection and exemplary applications of the system architectures, apparatus and methods. The technology will allow touch commands on an iDevice under water and more.
Apple notes in their patent filing that the position of an object touching a surface can be determined using time of flight (TOF) bounding box techniques, acoustic image reconstruction techniques, acoustic tomography techniques, attenuation of reflections from an array of barriers, or a two-dimensional piezoelectric receiving array, for example.
Acoustic touch sensing can utilize transducers, such as piezoelectric transducers, to transmit ultrasonic waves along a surface and/or through the thickness of an electronic device to the surface.
As the ultrasonic wave propagates, one or more objects (e.g., fingers, styli – Apple Pencil) in contact with the surface can interact with the