How Touch Screens Work

By Dhruv Shah

Touch Screens

In the world of technology, we use touch screens everywhere. We use touch screens in our cars, phones, computers and many more devices.

We use touch screens for many reasons, such as;its easy to use, its faster, and its easy to look after it.

The two types of of touch screens are

1. Resistive touch screens

2. Capacitive touch screens

Capacitive touch screens

Capacitive touch screens do not use the pressure of your finger to make a flow of electric charge. Capacitive touch screens work with anything that has an electrical charge. Capacitive touch screens are made up of materials such as copper or indium ton oxide. These materials store electrical charges in an electrostatic grid of tiny wires, each smaller than a human hair.

There are two main types of capacitive touch screens. There is surface and projective screens. Surface screens use sensors at each corner of the screen and a thin layer of film over the display. Projective screens use a grid with a separate chip for sensing. When a finger touches the screen a tiny electric charge travels to your finger to complete a circuit.

This is also why you can not use gloves on a capacitive touch screen because, cloth does not conduct electricity.