Plasma TVs can control individual pixels independently. That means that black is shown as true black, since the pixel is fully turned off.
LCD TVs can’t control individual pixels, only groups of pixels, called zones. The more zones an LCD TV has, the better the picture will look but blooming will always be a problem around black areas in the image.
OLED TVs are the “new” Plasma TVs, since they also control individual pixels independently. If you want a new TV that has perfect blacks like your old Plasma TV, go for an OLED.
Edit: Guys, this is ELI5. To everyone trying to correct me talking about backlighting and all, yes, this is an oversimplification but it gets the point across.
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