Barging in with a vaguely related question here. Could anyone please illuminate a noob, briefly, as to what's the situation with open-source drivers for display

Barging in with a vaguely related question here. Could anyone please illuminate a noob, briefly, as to what's the situation with open-source drivers for displays? Because, judging by the practical unportability of Android on phones, it looks like a ‘piss off’ from big boys of the market. (Or is the Android's problem more with radio chips?)