Touch Screens

By: Filip Jarzembowski

How do the touch screen recognise persons touch

Touch-screen monitors have become more and more commonplace as their price has steadily dropped over the past decade. There are three basic systems that are used to recognize a person's touch:

  • Resistive
  • Capacitive
  • Surface acoustic wave
  • Electronic devices can use lots of different methods to detect a person's input on a touch screen. Most of them use sensors and circuitry to monitor changes in a particular state. Many, including the iPhone, monitor changes in electrical current. Others monitor changes in the reflection of waves.