Surface Acoustic Wave Technology (SAW)

SURFACE ACOUSTIC WAVE TECHNOLOGY (SAW)

Surface Acoustic Wave (SAW) touch technology is slowly being replaced by other touch technologies. 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 sautered components.

How Surface Acoustic Wave (SAW) Works:

SAW touchscreens rely upon sound waves; thus, “sound wave reflectors” are placed along the edges of the glass. Two transducers are placed in two of the corners, and two receivers are mounted in the opposite corners. A sound wave travels parallel to the edges of the glass. When the sound wave encounters the reflectors, the wave is transmitted from the transducers to the receivers. A touch point is detected when a drop in the amplitude of the sound wave occurs.

ADVANTAGES
DISADVANTAGES
High Transmission and Optical Clarity Longevity – the sensor won’t outlast the display
Durable Glass Construction Vulnerable to Surface Contaminants and Water
Pressure Sensitive Requires Periodic Calibration
Requires Soft-Touch Inputs
USES/APPLICATIONS
Point-Of-Information Kiosks
Electronic Catalogs
Gaming, Lottery, & Amusement
Multimedia Marketing
Banking/Financial Transactions
Ticket Sales/Transportation
Multimedia Pay Phones
Industrial Control Rooms