The Samsung U8000F, more specifically the U8092F model in the 55-inch version, is equipped with an IPS panel. Let's be honest – this is not the best choice when it comes to displaying blacks and contrast correctly. The results in this category are just poor. The contrast is abysmal, and watching dark scenes with any kind of "cinematic" effect is nearly impossible. Additionally, the fact that the television lacks local dimming doesn’t help, making it hard to achieve better results. The only thing that deserves praise is the fairly decent uniformity of the panel – but that's more of a small consolation. Overall, it's not good. If you care about deep blacks and reasonable contrast, it's definitely better to go for the variant with a VA panel, which performs significantly better in this particular series.
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.