Touch screen!
Its one of the most amazing technology developed which we are attracted with. The first mobile with touchscreen i.e., IBM Simon,was launched in 1992.
How does it work?
Variety of technologies are present to detect your finger on the screen. They are some kind of sensors usually capacitive or resistive which detect it. Recent advancements are on inductive technology which is acquiring its prominence.
Resistive Touch
It has some layers for functionality. But two layers which are facing each other, one beneath the screen and on the substrate with a thin gap between, makes the heart of tech. One is excited by voltage and other senses it. So your finger pressure connects them at that point for sensing.
It is advantageous because of its low price, but at the cost of needing to press down a bit more.
Capacitive Touch
The lower layer of screen is coated with some conducting transparent material such as Indium Tin Oxide(ITO), and insulator screen acts as Di-electric. Known that your finger conducts. So the touch changes the capacitance, which senses the finger.
There are more variations of this, but the change in capacitance plays a major role.
Inductive Touch
Here a layer coated below the screen and PCB trace coils beneath create magnetic field. upon touch the the field strength varies which is measurable, this provides the required sensing mechanism.
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