Question: How are I pads touches made? I have herd that it is by butterflies wings but I'm not 100% that's true

Jess Wade answered on 17 Jun 2015:

iPad touches were likely not anything to do with butterflies. There are lots of different electronics going on in an iPad, like the camera and the switches and the light-up screen, but I think you mean ‘how do they make a touch screen’.

Touch screens work by electronic circuits and sensors. Screens on iPhones and iPad touchers work by measuring changes in electrical current when our fingers come near the conductive surface. The surface of the phone can conduct a tiny bit of electricity, and measures how that changes when we move our hands across it. It basically changes the state of the iPad or phone we are touching.
Some other sensors would by getting in the way of infrared beams or sound waves. When we get into lifts the doors don’t close on us because we break a little beam of light, and when we’re out of the way and safely inside the beam can tell the lift to close the doors.
Screens can do really clever things like respond to lots of touches on the same sceen at different times. they use grids of different materials to be able to locate just where on the surface you have changed the amount of charge that can move across it.