QN80F is a representative of the Neo QLED series, which means it's a television with Mini LED backlighting. Unlike its cheaper cousin, the QN70F model, here the diodes are placed directly behind the panel (rather than at the edges), which gives a solid advantage in contrast control right from the start. In the 65-inch variant we tested, we counted 88 local dimming zones – a result that may not be particularly impressive, but as it turned out, sufficient to achieve quite decent results.
In tests based on scenes from movies like Oblivion and The Meg, the QN80F performed well – blacks were deep, and the overall image consistency was eye-catching. However, in more demanding moments (e.g., scenes with a lot of bright details on a dark background), a halo effect appeared. This is where the limitation of the number of zones shows – bright elements could bleed into each other, and some details in dark areas lost sharpness and contrast. In one of the helicopter scenes (The Meg), we even noticed a slight flicker in brightness, as if the television was trying its best to maintain visibility of details at the expense of black depth.
However, these are not problems exclusive to this model – the halo effect or contrast drops in very complex scenes are something most Mini LED televisions struggle with, even the more expensive ones. In its class, the QN80F still performs positively and offers clearly better contrast than the QN70F model with edge lighting. For most users, this will be a level more than sufficient – though not ideal.
If we compare the contrast results of this year's QN90F with last year's QN90D, it quickly becomes clear that the differences are minimal. In the best movie scenes, the contrast can reach values well above six digits, and sometimes even seven digits, which can be confidently considered as results nearly infinite. And indeed – in typical cinematic shots, the effect closely resembles that known from OLED TVs. Samsung deserves praise because despite a relatively "modest" number of dimming zones – 504 in the 55-inch variant (modest compared to Chinese competitors like Hisense U8Q or TCL C8K/C9K) – they managed to refine the local dimming algorithms. This is particularly noticeable in the most challenging scenes, where, compared to last year's model, the precision of dimming has nearly doubled. Of course, we still don't have perfectly separated bright objects from blacks, and we cannot speak of the absence of halo effects (slight glows around small bright objects) known from MINI-LED TVs, so QN90F still doesn't win against OLEDs. But it is definitely approaching them in a more mature and refined way than a year earlier.