It's a shame SED never took off:
https://en.wikipedia.org/wiki/Surface-conduction_electron-emitter_display
FED is still experimental too:
https://en.wikipedia.org/wiki/Field_emission_display
Quite interesting really, I think Plasma TVs still have better picture quality and smoothness than LED TV's.
No matter how hard i try not to notice pixelated images on led and oled its still there along with the seemingly forced motion smoothing that looks fake imo.
I would love a newer tech to blow us all away but of course its all about cost.