How does a touch-screen on an iPad work?
user
In the iPad’s operating system, a “finger” is detected by how it touches the screen.  It uses a capacitive touch-screen.
assistant
What is a capacitive touch screen?
user
For the purposes of discussion, we’ll say that a capacitive screen senses the amount of electricity generated when a finger approaches it, and that data is used to detect how the finger is touching the screen.
assistant
Who invented the capacitative touch screen?
user
A bunch of people in the 1970s and 1980s.
assistant
Actually, historians consider the first touch screen to be a capacitive touch screen invented by E.A. Johnson at the Royal Radar Establishment, Malvern, UK, around 1965 - 1967.
user
Oh, my bad, I only looked up the Wikipedia page, and it was incomplete.  In fact, I remembered the Apple name, not the inventor’s name.
assistant
How does a touch-screen on an iPad work?
user
In the iPad’s operating system, a “finger” is detected by how it touches the screen.  It uses a capacitive touch-screen.
assistant
What is a capacitive touch screen?
user
For the purposes of discussion, we’ll say that a capacitive screen senses the amount of electricity generated when a finger approaches it, and that data is used to detect how the finger is touching the screen.
assistant
Who invented the capacitative touch screen?
user
A bunch of people in the 1970s and 1980s.
assistant
Actually, historians consider the first touch screen to be a capacitive touch screen invented by E.A. Johnson at the Royal Radar Establishment, Malvern, UK, around 1965 - 1967.
user
I had no idea, although I wasn’t familiar with this piece of information.  So let’s learn a little more about how the iPad works.  The iPad first starts by detecting the touch and gestures (aka haptics), then it identifies the contact, then it processes the contacts and translates them into actions, and finally it dispatches the actions to an appropriate piece of code (aka a “handler”).  That’s the end-to-end process for detecting and handling touch events.
assistant
How does a touch-screen on an iPad work?