Touch screens are everywhere around us. How do they work?
There are many technologies. The two main ones are:
Every technology has its advantages and disadvantages. For example, capacitive technology does not allow for the use of gloves or any stylus. It is also not suitable for large formats. Resistive technology is less expensive but wears out over time and the multilayers degrade image quality.
In both cases a rare metal, indium, is used. It is classified as a critical raw material. For this reason, we need to control our consumption of digital devices.