How Touch Screens Work
By Dhruv Shah
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
Resistive touch screens
These touch screens are the basic and common touch screens that are used at ATM's and most stores. These screens require an electronic signature with the small pen.
If you out enough pressure on the screen you can feel it slightly bend. Two electrically conductive layers bending to touch one another.
One of the yellow layers are conductive and one is resistive. They are separated by a thin layer of tiny dots called spacers to keep the two layers apart until you touch it. A thin scratch-resistant layer (blue layer) is there to protect the screen.
An electrical current runs through the yellow layers all the time, but when your finger touches the screen the two layers are pressed together and the electrical current changes at the point of contact. When contact is made on the screen, the X and Y coordinates of the touch is calculated based on the amount of resistance at the point of contact.