To me mini-LED isn't a game changer, it's more of a stop-gap. I don't think that TCL will achieve anything with mini-LED that Sony, for example, didn't achieve with "regular" LED's on sets such as the Z9D. Sure, mini-LED's *could* be used to make nicer FALD sets, but I personally think that self-emissive technology is the (near) future and so that is what the big dogs are R&D'ing right now.
To me mini-LED's mostly give you less banding (better uniformity), maybe wider viewing angles (at least in theory), and a thinner set. For the most part, uniformity is fine these days. Thin is nice if it matters to you.
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