QN80F is a representative of the Neo QLED series, meaning it is a television with Mini LED backlighting. Unlike its cheaper cousin, the QN70F model, the diodes here are placed directly behind the panel (rather than at the edges), which gives it a solid advantage right from the start when it comes to contrast control. In the 65-inch variant we tested, we counted 88 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 films such as Oblivion and The Meg, the QN80F performed well – blacks were deep, and the overall image consistency was visually appealing. However, in more demanding moments (e.g., scenes with a large number of bright details on a dark background), a halo effect appeared. This is where the limitation of the number of zones becomes evident – bright elements could bleed into one another, and some details in the dark areas lost visibility. In one scene featuring a helicopter (The Meg), we even noticed slight brightness flickering, as if the television was trying its best to maintain detail visibility at the expense of black depth.
However, these issues are not exclusive to this model – halo effects or drops in contrast during very complex scenes are challenges faced by most Mini LED televisions, even the more expensive ones. In its class, the QN80F performs positively and offers significantly better contrast than the QN70F model with edge backlighting. For most users, this will be a level more than sufficient – although not perfect.
The U7S Pro in the 65" variant we tested 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, blacks here are truly very good. In dark scenes, watched with the lights slightly on, the effect can even resemble that of TVs with organic OLED panels – as our first test scene from the film Oblivion excellently demonstrated. Unfortunately, when more small, bright elements appear on a dark background, the local dimming algorithm starts to show its weaknesses. The contrast can clearly drop at that point, and a "halo" effect, which is a characteristic glow (known as blooming), can become visible around bright objects. However, this is a natural feature of Mini-LED TVs resulting from the physical limitations of this technology – there are many dimming zones, but there will always be fewer than independent pixels in an OLED, so it's 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 made any significant improvement in this aspect in practice.