With our projected capacitive films, two sensor layers with conductive strips are used.
The isolated strips serve as transmitting and receiving units.
If a finger is placed at the intersection of two strips the exact position can be determined by a charge surplus.
The projective capacitive technology differs in some aspects from optical methods for touch detection:
- Ultra low latency
In optical methods, a signal is recorded with (infrared) cameras and must be processed afterwards. The capacitive technology processes signals faster and provides lag-free operation.
- Daylight independence
Infrared-based systems are sensitive to light, optical filters may reduce the problems, yet the use in very bright environments or outdoors is not recommended. Capacitive systems are completely insensitive to daylight.
- Superior image quality
The projective capacitive method does not affect the image quality of the underlying display.
- Frameless design with no image shift
Since capacitive touch screens can be placed in minimal distance to the display, there is no offset between the image information and the touch point. Furthermore frameless designs are possible, because no sensors are attached to the edge of the display.