TouchScreen LCD from Advantech

There are several different touchscreen technologies, that determine the pressure points in different ways:

Resistive Touchscreens:

This type works by using two special foils. By touching the display, a weak electrical impulse is being generated, because the foil underneath is conductive.

Capacitive Touchscreens:

Capacitive touchscreens work by a weak electric field that is generated through electrodes. When touching parts of the charges are diverted and the electric field shifts.

Optic Touchscreens:

Optical systems work by lamps and light-sensitive sensors. These are embedded in the frame of the touchscreens and generate a grid of light barriers.

Inductive Touchscreens:

This touchscreens can only be operated by a special pen. That is why this technology can almost only be found in graphic tablets, because the positioning is extremely exact.

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