system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how come modern phones and tablets don't require touch screen calibration the way older Touch devices used to.

I remember on my old pda I would have to calibrate it once a week by touching targets on different parts of the screen.
gpt
They use different technologies.

Older touch screens measured the electric resistance at various points around the screen to check if you were touching them. This method requires calibration so that the software knows what resistances measured at which points correspond to specific parts of the screen being touched.

But modern touch screens measure the capacitance, rather than the resistance. This type of screen does not need calibrating. It's also better at detecting more than one finger, and it can respond to "touches", rather than having to be pressed.