In this era of information flying everywhere, the way people transmit information has undergone tremendous changes, from the ancient trustee to send letters to flying pigeons to pass books, mail, and now in the Internet age... Mobile phones have become indispensable for people in this era. One of the things missing. It can be said that everyone’s daily life is inseparable from the mobile phone. Through the continuous sliding of our fingers, we can complete the exchange and acquisition of information.

The development of mobile phones is inseparable from the progress of touch screens, so what is the principle of touch screens? How did you get to today step by step? Not much to say, let's go and see~

At present, the mainstream touch screen is divided into two types, namely resistive touch screen and capacitive touch screen.

Resistive touch screen

Resistive touch screens are relatively simple and widely used in life, such as ATM cash machines, POS machines, etc.

The resistive touch screen is composed of two conductive layers, one is resistive, the other is conductive, and a spacer layer is sandwiched between the two layers, and the spacer layer is composed of some tiny dots.

Under normal circumstances, the current flows continuously in the two layers, but when the finger touches the screen, the screen will bend, and the two layers will be squeezed together, causing the current to change, and the position of the current change will be fed back to the device. software, the software will perform the function corresponding to the location. For example, when you click to withdraw 200 yuan at the ATM machine, the ATM machine will spit out 200 yuan.

capacitive touch screen

Although resistive touch screens are reliable and durable, due to their multi-layer structure, it is difficult to achieve reading functions and the screen will become blurred under strong light. Resistive touch screen, using capacitive touch screen.

The biggest difference between a capacitive touchscreen and a resistive touchscreen is that it doesn't require you to poke it with your finger, but just touch it with anything that has an electrical charge to change the current.

Because fingers are composed of atoms with positive and negative charges, as long as the fingers touch the screen lightly in daily life, they will transfer tiny charges to the fingers, and then form a complete circuit locally, causing the voltage at that location to drop, The mobile phone software performs the corresponding function of the voltage drop position.

It turns out that the touch screen realizes the different functions we want in this way. I have to say that the technological products in the Internet age are really awesome!