Smart-phones are one of the biggest boon to people in today’s modern world. These smart-phones contain favored features for humans, which reduces time, saves money and energy in the latest electronic technology.
These smart-phones are enabled with touch-screen, which responds only to electric impulses like fingers or toes.
The reason why smart-phone touch-screens don’t respond to gloves, plastic material, pen, etc.. is because these touch-screens are “Capacitive” in nature.
Two kinds of touch-screens are “Resistive” and “Capacitive”.
Resistive type touch-screens require a force of pushing (example: ATMs touch-screen, automated supermarket checkouts) to function.
In resistive touch-screens, two thin flexible layers separated by a minor space is located before the actual LCD display and works when current is passed after a force touch on them.
Capacitive type touch-screens require electric impulse (example: fingers, toes) for functioning.
In capacitive touch-screens, 2 conductive layers (vertical and horizontal array wires)are separated by an insulator, where tiny electric current is passed through always.
In contact with the conductive layer, the electric current passed is shortened at the intersection, thus capacitor is loaded and corresponding signals are send to the software system to process the required output.
These capacitive touch-screens will never respond to pressure .
Thus, requiring electrical conductivity, smart-phones don’t respond with gloves or any plastic materials.