Dell S2722QC, because it looks reasonable, fits nicely on my desk, and shows me the pixels my computer puts out, which is about all I expect a monitor to do. I don't know what "ideal" would mean.
I think he's referring to OLED, in which each LED can organically emit light without the glow of a backlight. But in terms of most productivity monitors today, your current one was likely a great value and works just fine.