Depends on usecase (how far away your eyes are) and how big the display is (again, how far away). TV is far away, has ideally 50 to 60" but low dpi. Computer display is good around 30 to 40", maxes out at around 4k. Notebook 10 to 15", high dpi, 2k is good enough. While a phone has very high dpi, but 5 to 7" and around 1k res.
Depends on usecase (how far away your eyes are) and how big the display is (again, how far away). TV is far away, has ideally 50 to 60" but low dpi. Computer display is good around 30 to 40", maxes out at around 4k. Notebook 10 to 15", high dpi, 2k is good enough. While a phone has very high dpi, but 5 to 7" and around 1k res.