The model we tested, with a 55-inch diagonal, is equipped with a VA panel. And here we have great news: this is a huge advantage over the IPS version if you care about deep blacks and a vivid picture. Our measurements showed that in typical movie scenes, the native contrast is really solid, exceeding values around 6000:1. In practice, this means that black is truly black, not grey, which works very well for occasional evening viewing and is not annoying. Interestingly, there were moments when our measurement devices indicated contrast levels of over 20,000:1. Where does such a jump come from? The LG QNED80A is equipped with a Local Dimming system. However, this is an edge-lit setup. This means that the television can dim vertical backlight strips where the image is supposed to be dark. In theory, this sounds great and indeed allows for better numbers in graphs than with a classic LCD screen. Unfortunately, practice can be brutal. The use of edge dimming is a double-edged sword that can spoil the film viewing experience in challenging scenes. An ideal example is the helicopter scene in the film Sicario 2. When there is a lot of black on the screen and small, bright points, 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 blacks, we then see a glow (blooming), which simply looks bad and detracts significant attention from the plot. Although the dimming system improves measurable contrast, in everyday use – especially with the lights off – its aggressive operation can be irritating. Often, a better solution may turn out to be... turning off this feature or setting it to minimum, to enjoy a stable, natural black of the VA panel itself.
The TCL C7L is a Mini LED TV which, in the 65-inch model we tested, is equipped with over 1,000 local dimming zones. Combined with a proprietary VA panel (referred to by TCL CSOT as HVA 2.0), this delivers very respectable results for black levels and contrast. In most of the scenes we measured, black levels and contrast looked very good, and in the easiest shots the blacks were deep enough to even resemble those seen on OLED screens. This, of course, refers to the least demanding shots with large areas of black on screen. When more bright elements appear on screen and black no longer dominates, you can see that the TCL C7L, like most Mini LED TVs, has issues handling its local dimming zones.
This is particularly obvious on the black bars in films shot in the 2.35:1 widescreen format. A distinct halo effect, a bright glow, can appear on the black bars or around small bright objects. Contrast can then drop drastically, from lab-measured values of around 200,000:1 to about 10,000:1, which is quite noticeable in a completely dark room. It’s worth remembering that this should not be treated as a flaw of the TV but rather as a characteristic of Mini LED technology. Of course the effect becomes much less intrusive if you turn on even a small amount of diffuse light in the room, which I strongly recommend doing when watching any LCD TV.