Surface Acoustic Wave (SAW)
Surface Acoustic Wave, The surface of the touch panel is made entirely of glass. The ultrasonic wave transmitter and receiver at the three corners form a uniform sound field in the middle area when the surface wave touches the finger and soft medium will be absorbed energy, that is, produce acoustic cut-off, in order to calculate the touch position.
Surface Acoustic Wave(SAW) touch is not easy to be damaged, suitable for a variety of occasions, but the disadvantage is the high cost of upstream and downstream integration is not easy, the screen surface if there are drops of water and dust will make the touch screen becomes slow or does not work and can not do more detection measurement.While SAW differs from both projected capacitive and surface capacitive in its ability to be activated by different touch inputs, it’s harder to integrate. Durability also is a concern due to the sauteed components.