Touch Screens

Now a day’s having a touch screen device like mobile, tablet PC, desktop, laptop etc, is usual thing. In simple words we can say, touch screen device is a combo of ease and style. But how many people know about biology of touch screen? So let’s see how touch screen works.....

The touch screen recognizes the location of the contact and responds according to the software program it contains. Interaction is made directly with a standalone computer or through a display connected to a larger network. There are three basic components to a touch screen system. The monitor can be an integrative monitor with a touch sensor built in or a touch sensor panel can be added, which sits over the monitor screen and detects movement on the screen. The second component is a controller card that translates the touch from the screen to computer language and sends it to the third component, a software driver that allows the screen and computer to work together.

How do touch screens work?

Touch screens are activated by the insertion or removal of the fingertip or by pressing the controls, active areas or targets with a mouth stick, head stick, or other similar device (stylus). Some touch screens support stylus input and others do not. The difference is in the device's touch sensor technology, of which there are several common types:

Resistive touch screens are pressure sensitive, so they can be operated with any input device, including a gloved hand or stylus. However, resistive screens can be easily damaged by sharp objects and they offer only 75% clarity, which may create additional problems for people with low vision.

Capacitive touch screens offer higher clarity and are more durable, but they do not respond to gloved hands or most styluses (the pointing device must be grounded).