The model we tested, with a diagonal of 55 inches, is equipped with a VA-type panel. Here’s the great news: this is a huge advantage over the IPS version if you care about deep blacks and a vivid image. 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 black, not grey, which works very well for occasional evening viewing and is not irritating. However, there are moments when our measuring devices indicated contrast levels over 20 000:1. Where does such a leap come from? The LG QNED80A is equipped with a Local Dimming system. However, this is an edge-lit system. 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 indeed allows for "better numbers" in tables than in a classic LCD screen. Unfortunately, practice can be brutal. The use of edge dimming is a double-edged sword that can disrupt the viewing experience in challenging scenes. An ideal example is the scene with the helicopter in the film Sicario 2. When there is a lot of black on the screen and small, bright points, the dimming system starts to operate 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 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 option may be to... turn off this feature or set it to minimum, to enjoy stable, natural blacks from the VA panel itself.
TCL C7L is a Mini LED TV, which in the 65-inch variant we tested, is equipped with over 1000 local dimming zones. This, combined with the proprietary VA panel (called HVA 2.0 by TCL CSOT), delivers really decent results in terms of black levels and contrast. In most of the scenes we measured, the blacks and contrast looked really good, and in the easiest shots, the black was deep enough to almost resemble that seen on OLED screens. This is of course referring to the least demanding shots with a lot of black on the screen. However, when more bright elements appear on the screen, and black stops dominating as much, it is evident that TCL C7L – like most Mini LED TVs – has its issues with local dimming zone management.
This can be clearly seen, for example, on the black bars in films shot in the 2.35:1 panoramic format. Then, on the black bars or around small, bright objects, a pronounced halo effect, or a bright light glow, can appear. 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’s worth remembering that this shouldn’t be treated as a flaw of the TV but rather as a characteristic of mini-LED technology. Of course, this effect becomes much less bothersome when we turn on at least some light in the room… which I definitely recommend doing during screenings on any LCD TV.