Input Devices : Touch Sensitive Screen

A touch sensitive screen is a special type of visual display unit. In front of the display a grid of light beams or fine wires criss-cross the screen. When you touch the screen the computer senses where you have pressed. Touch screens can be used to choose options which are displayed on the screen.

The main application for which touch screens are used is the provision of public information systems. Touch screen operated computers can be found in places such as travel agents and airports. Here a touch screen is being used to provide information to tourists :

The grid in front of the screen can not be seen by the user. The screen is located behind the glass in the tourist office's window so that visitors can obtain information even if the office is closed.

Touch screens are not used very often as they are not very accurate, tiring to use for a long period and are more expensive than alternatives like a mouse. The main advantage of the touch screen is that anyone can use it without having to be trained.

GCSE ICT Companion 04 - (C) P Meakin 2004