Touchscreen

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A touchscreen is a touch sensitive display, which allows electronic devices such as laptops or iPhone with your finger can be controlled. Besides the simple tapping icons on the screen with many devices a more detailed control possible using certain finger movements or gestures. In the multi-touch multiple simultaneous touches can also be converted to various commands.

A touchscreen is…

Especially since the release of the iPhone and touchscreen TV everyone knows what a touchscreen is. Increasingly popular are the touch-sensitive display that allows electronic devices such as laptops, smartphones and cameras through touching, are operated. The highly successful mini - game console DS ( i ) Nintendo uses the touch screen even to control the game .

Besides the simple tapping icons are in many touchscreens and multitouch gestures even more complicated as possible, with multiple simultaneous touches are converted . Certain tasks Thus, the display format can be changed by spreading or contraction of the thumb and index finger on the touchscreen.

The technology behind the touchscreen

The process of the different touch screens varies . In modern electronic devices such as the iPhone is usually a capacitive touchscreen . This relates to a glass substrate which is coated with a translucent layer of metal oxide. Using one of the edges of the applied voltage is low and a precisely uniform electric field with which a controller receives information and converts it into commands arises. Capacitive touch screens can be operated either with a finger or a pen (also called stylus ) .

Inductive touchscreens can only be used with special pens ( with integrated coil) . They are among others used in drawing tablets and especially appreciated because of their robustness - there is no pressure on the screen is required , the position is determined through the coil . As a result, a very solid surface material can be used .

In contrast, resistive touchscreens screen only responds to pressure which two electrically conductive layers make contact . On the basis of the electrical resistance , the position of the pressure point is determined . Rather outdated and very simple four-/five-/six-/seven-/eight-wire the touchscreens . They also operate with electrical power, which will be put. Via a different number of terminals ( wires ) in the vertical , respectively horizontal direction on the two conductive layers