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Guided acoustic wave is based on transmitting acoustic waves through a glass overlay placed over the display surface. A transducer mounted on the edge of the glass emits an acoustic wave. The wave packet travels along the reflector array, is redirected across the overlay to the reflecting edge, and returns to the array where it is reflected back to the transducer. The first reflector will send a signal back first, then the second, and so on.
When a stylus such as a finger comes into contact with the wave, it attenuates the wave motion by absorbing part of the wave. Control electronics detect the location of the dip in the wave amplitude, thus determining the touch position.
|Comparison of the Touch Technologies|
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