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.
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 a proprietary VA panel (referred to by TCL CSOT as HVA 2.0), delivers really decent results in terms of black levels and contrast. In most of the scenes we measured, black levels and contrast looked really good, and in the easiest shots, the black was deep enough to resemble that known from OLED screens. We are, of course, talking about the least demanding shots with a lot of black on the screen. However, when a larger number of bright elements appear on the screen, and black no longer dominates so strongly, it becomes clear that the TCL C7L – like most Mini LED TVs – has its issues with managing local dimming zones.
This is particularly evident in the standard black bars in movies recorded in the panoramic format 2.35:1. In this case, a clear halo effect, or bright light glow, can appear on the black bars or around small, bright objects. The contrast then drastically drops – 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 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 soft, diffused light in the room... which I definitely recommend doing during viewing sessions on any LCD TV.