The rumor mill has been pointing to an upgraded Nintendo Switch coming in 2021 for some time now. The latest detail to emerge about the purported handheld console is that it will sport mini-LED technology which should deliver improved contrast ratios and deeper blacks for more engaging gameplay.
https://www.notebookcheck.net/Rumored-Nintendo-Switch-Pro-could-pack-a-mini-LED-display.499938.0.html