Capacitive Touch Screen : Brief Details

Capacitive Touch Screen work on the principle of Capacitive sensors which work based on the change in the capacity of a single capacitor or an entire condenser system. Capacitive Touch Screen can be effected in various ways, which are mostly done at hardware level. Previous to this article on Capacitive Touch Screen, we published another article on Touch Screen in general.

Technology behind Capacitive Touch Screen

Capacitive Touch Screen works on the principle of Capacitive sensors which work based on the change in the capacity of a single capacitor or an entire condenser system. Capacitive Screen can be effected in various ways, which are mostly done at hardware level.

The basic principle of a capacitive sensor as well as Capacitive Touch Screen is based on the principle that the two plates form an electrical capacitor whose capacitance can be influenced on touch.
First plate of the Capacitive Touch Screen, that is the surface of Capacitive Touch Screen which we actually touch when touched, the effect can be measured. Touch or gesture changes electrically measurable capacitance of Capacitive Touch Screen. The panels of Capacitive Touch Screen is rigid and the capacitance changes, either because the electrically conductive material or dielectric material is placed in the immediate vicinity.

By the capacitive pressure sensor if present on a Capacitive Touch Screen, the capacitance changed is evaluated as a result of bending of a membrane and the resulting change in plate separation as a sensor effect. The membrane is designed here as a capacitor plate. The capacitance changes are fairly small, so that a suitable processing electronics must be integrated with high sensitivity.

Usages of  Capacitive Touch Screen

The most common usage of Capacitive Touch Screen today is for the Tablet PC which runs either Android Operating System or iOS (Apple’s iPad Series). Similar small devices with similar Operating Systems like  a Touch enabled SmartPhone is usually also uses a Capacitive Touch Screen. Many industry specific devices like a device that is to be operated inside an Operation Theater can also have Capacitive Touch Screen.