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.
TCL C7L is a Mini LED television, which in the 65-inch variant we tested, is equipped with over 1000 local dimming zones. This, combined with the proprietary VA panel (referred to by TCL CSOT as HVA 2.0), yields truly decent results in terms of blacks and contrast. In most of the scenes we measured, the black levels and contrast looked really good, and in the easiest shots, the black was deep enough to almost resemble that seen on OLED screens. Of course, we are talking about the least demanding shots with a lot of black on the screen. However, when a greater number of bright elements appear on the screen and black no longer dominates as strongly, it is apparent that the TCL C7L – like most Mini LED televisions – has its issues with managing local dimming zones.
This is particularly evident in the black bars in films recorded in the 2.35:1 widescreen format. At that point, a distinct halo effect, or bright light glow, can appear on the black bars or around small, bright objects. The contrast then drastically dropped – from laboratory values of around 200,000:1 to about 10,000:1, which is quite noticeable in a completely dark room. It is worth remembering that this should not be treated as a flaw of the television, but rather as a characteristic of mini-LED technology. Of course, this effect becomes significantly less bothersome when we turn on at least some soft, diffused light in the room... which I definitely recommend doing during screenings on any LCD television.