This is where big screens get slightly confusing and extremely expensive. It's also where TVs get much, much bigger than 75 inches. Although LED TVs are just LCD TVs with LED backlights, LED video walls are a completely different technology. They use clusters of colored light-emitting diodes to form each pixel and light it up, like OLED. The good news about LED video walls is that they can get very large. The bad news is that they have to be really big, and that's a limiting factor if you want to fit a 4K picture in a certain space. First, be aware that miniLED is not the same as LED video walls. The latter option uses those individual LEDs to form pixels. MiniLED arrays, which are becoming increasingly common on high-end LED TVs, simply consist of hundreds of white LEDs backlighting an LCD. Digital signage commonly uses LED video walls. If you see a huge light-up sign that plays video on the side of a building, it's probably an LED array. If you get close to it, like within 10 feet, you can probably see the individual pixels from each relatively large LED cluster. They're great for stadiums but not for home theaters. That's changing with miniaturized LEDs, like Samsung's microLED video wall and Sony's Crystal LED wall. These newer video walls have pixel pitches of 0.8 to 1.2mm, which means the pixels are small enough that you can sit comfortably back and not notice the individual lights. They're still huge pixels compared with LCD and OLED TVs (a 4K 80-inch TV has pixels less than 0.5mm across), but they're much smaller than the big commercial signs with lights as big as your fist. These new video walls are also rare and wildly expensive. You won't find them on Amazon or at Best Buy. They're largely designed for commercial installations, which means being a business that needs and can afford to put up a massive video wall. They're supposedly available (or will eventually be available) for consumer use, but the consumers in these cases probably own mansions.