Pressure-sensitive touch panels can measure pressure and location information simultaneously and  provide an intuitive and natural method to sketch and write with new levels of control and interactivity.
However, they have been generally realized by a simple combination of separate pressure sensor and location sensor or a stylus-based interface to identify 3D signals, which limit their implementation in a wide spectrum of applications.
Here, we report a first demonstration (to our knowledge) of a transparent and flexible 3D touch which can sense the pressure and location information simultaneously in a single device with the assistance of functionally designed self-generated multiscale structures and a nanowire percolation network.
The developed flexible 3D touch device could assign functionalities to objects without reference to any varying surfaces. As a proof of concept, the single 3D flexible touch system was demonstrated to draw a complex 3D structured object by utilizing the pressure information as a third coordinate information, and large area 10×10 sensor array also was demonstrated.
Furthermore, rigorous theoretical analysis was carried out to achieve the target pressure sensitivity in a wide measurment range and successful 3D data acquisition in wireless and wearable conditions, which in turn, paves the way for future wearable devices.