The iPhone screen transformed the way we interact with our mobile phones. The multi touch interface and very quick screen response made the iPhone a very usable device. HowStuffWorks have created an interesting article which breaks down the iPhone multi touch screen and shows in detail how it all works.
When touching an iPhone screen it can sense exactly where and what needs to be done. Due to the screen being multi touch it also allows for even more interactivity such as zooming in to photos by placing a thumb and finger on to the screen.
Some touch screens use light, and when an object it placed in the way it detects where the object was placed. Another version of this uses a capacitive touch screen which detects where contact is made by the way of an electrical charge which changes and sends the signal back to the CPU. However, the iPhone is different as it can detect 2 fingers on the screen at the same time. I recommend reading the full article over at HSW as it goes in to very good detail on how the whole screen and touch system works and makes a very interesting read.
Via: Fosfor
