Carrol Touch Modular Flat Panel Specifications download pdf (Page 27)

Chapter 2 - Introduction to Guided Wave Touch Systems CARROLL TOUCH

2-2 Touch System Programmer’s Guide

Overview

A Carroll Touch guided wave touch system consists of a touch

controller and touch screen. The touch system uses guided acoustic

wave (GW) technology to detect operator input for a variety of

applications. Generating invisible acoustic waves, the touch system

reports touch input when the wave motion is attenuated by a stylus

(typically a finger). This input can be used by a touch application just as

similar applications use input from pointing devices such as a mouse,

light pen or trackball.

Touch Screens

Guided acoustic wave technology 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 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, as shown in Figure 2-1.

Figure 2-1. Guided Wave Touch Screen

Touch Controllers

The touch controller is the circuitry required to create and monitor the

acoustic waves. A sequence of electrical pulses is sent to the transducer

located in the upper left of the glass overlay to generate the acoustic

waves. The area covered by the acoustic waves is the touch active area.

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Carrol Touch Modular Flat Panel Specifications Page 27