Unlike resistive touch technology, surface capacitive technology works completely without pressure. A light touch on the touchscreen is enough to activate a touch pulse.
The surface of a surface capacitive touch screen usually consists of a glass surface on which a transparent metal oxide coated film is laminated.
##Funktionsprinzip of a surface capacitive touch screen
Voltage is applied to the corners of the touchscreen, which forms a uniform electric field along the electrode structure on the conductive ITO surface.
If you touch the touchscreen with your finger, a certain amount of current is drawn from the surface.
The controller can now measure this charge loss and determine the exact position proportional to the distance from the contact points of the corners of the touchscreen using the X and Y coordinates.
ADVANTAGES of Surface Capacitive Touch Screen
An extremely fast response speed and very sensitive touch detection are among the advantages that particularly distinguish surface-capacitive touchscreens. A very light touch of the finger is enough to activate a touch pulse.
If you compare all touch technologies, you will find that the surface capacitive technology is the one with the fastest response time.
Surface capacitive touchscreens are preferred for PDAs or game consoles, as these are applications that benefit particularly from the fast response times.
DISADVANTAGES of Surface Capacitive Touch Screen
Various disadvantages of surface capacitive technology prevent it from being widely used for various industries or applications.
The disadvantages are:
- Operation is only possible with fingers or wired pens.
- A surface capacitive touch screen is not vandal-proof.
- Severe scratches may affect the function of the damaged area.
- Gesture recognition is limited to one point only, multi-touch is not possible.
In order to benefit from the advantages of capacitive technologies and at the same time maintain robustness comparable to resistive touchscreens, we recommend the use of projected capacitive technology.
