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 model we tested with a 55-inch diagonal is equipped with a VA panel. And here we have great news: this is a significant advantage over the IPS version, if you care about deep blacks and a rich image. Our measurements showed that in typical film scenes, the native contrast is really solid, exceeding values of 6000:1. In practice, this means that black is black, not gray, which works very well for occasional evening viewing and is not annoying. However, it’s interesting to note the moments when our measuring devices indicated contrast levels exceeding 20 000:1. What caused such a jump? The LG QNED80A is equipped with a Local Dimming system. However, this is an edge-lit configuration. This means that the TV can dim vertical strips of backlighting where the image is supposed to be dark. In theory, this sounds great and actually allows for better numbers in charts than in a classic LCD screen. Unfortunately, reality can be brutal. The use of edge dimming is a double-edged sword that can spoil the film experience in difficult scenes. An ideal example is the helicopter scene in the movie Sicario 2. When the screen has a lot of black and small, bright spots, the dimming system starts to work very aggressively and... not very precisely. You can clearly see how entire vertical strips of the screen brighten and dim, trying to keep up with the object. Instead of deep black, we see blooming, which simply looks bad and strongly distracts from the plot. Although the dimming system improves measurable contrast, in everyday use – especially with the lights off – its aggressive operation can be annoying. Often, a better solution may turn out to be... turning off this function or setting it to a minimum, to enjoy the stable, natural black of the VA panel itself.