Conceit, as far as TVs go, it has to do with the blurring that occurs since color are projected through/by tubes (I'd have to ask my father about the technicalities, he repaired them back in the day). The colors meld...since they aren't quite as focused when compared to a digital monitor. You can't 'emulate' the effect directly unless you used an extremely high res monitor and setup some weird blending algorithims (and stretched the image).... even then it probably wouldn't look right.
