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.
Dreame Q100 is an entry-level LCD TV, so its black level and contrast performance depend mainly on the panel itself. It uses a VA panel that achieves a native contrast ratio of about 4500:1. For this class of device that's a pretty good result. In practice this mainly means noticeably deeper blacks than similarly priced TVs with IPS or ADS panels. The difference is especially visible in the evening, when dark scenes have more depth and don't look as gray.
However, it's important to remember that the Q100 does not have local dimming. The entire backlight therefore runs continuously, with no ability to dim specific areas of the image. In a very dark room the blacks can start to take on a navy tint and are far from what better Mini LEDs and especially OLEDs can achieve in this regard. That said, this is not surprising, because the same limitation affects most entry-level LCD TVs in this price range.