SAW---Surface Acoustic Wave Techonology
SAW touch is slowly being replaced by other touch technology , it's harder to integrate , need clean on time .
There are transducer on corner of glass , and relfect arrays on egdes . 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.
It should be touched by finger or soft touch pen .