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.
The U7S Pro in the tested variant of 65" uses a VA panel and has as many as 960 local dimming zones. Thanks to the combination of such a panel (which has a high native contrast) and a large number of zones, the blacks are really very good here. In dark scenes, viewed with dim lighting, the effect can even resemble OLED TVs – as beautifully demonstrated by our first test scene from the movie Oblivion. Unfortunately, when more small, bright elements appear on a dark background, the local dimming algorithm starts to show its weaknesses. The contrast can noticeably drop, and around bright objects, the "halo" effect becomes visible, which is the characteristic glow (called blooming). However, this is a natural feature of Mini-LED TVs resulting from the physical limitations of this technology – there will always be fewer dimming zones than independent pixels in an OLED, so it is physically impossible to completely overcome this. Interestingly, although the new U7S Pro model has nearly twice as many local dimming zones as last year's U7Q Pro, it has not brought any significant improvement in this aspect in practice.