TCL C6K vs Philips OLED770

TCL C6K is a moderately bright TV that can showcase its full potential under the best cinematic conditions – the maximum brightness is around 600 nits. In scenes with large, intense light sources, the HDR effect can be really satisfying, providing a sense of cinematic brilliance. However, it should be noted that when managing the backlighting zones, there are situations where some elements become dimmed and sometimes can even become barely visible. It is clear that there is a lack of proper algorithm optimization here, although looking at the technical parameters in this price range, the design itself performs very well.

The Philips OLED770 does not attempt to compete with the brightest OLEDs on the market, and it would actually be hard to expect that, as it is the lowest model in Philips's series for 2025. In our measurements, it achieved a maximum brightness of about 700 nits, which allows for enjoyment of HDR effects in scenes where light appears point-wise – for example, in the flash of headlights or a starry sky. In such moments, the picture can truly impress. However, it is different when there are more bright elements on the screen. The television, like many cheaper OLEDs, limits brightness in those cases, and the entire picture noticeably dims. This was best seen in a scene from the movie The Meg, where the sun rises behind an oil rig – at that point, the brightness dropped to about 250 nits, nearly three times less. The HDR effect remains visually pleasing, but it is worth being aware that this model performs best in scenes with less intense light. Fortunately, the OLED770 has an ace up its sleeve – the coverage of the DCI-P3 color palette is as high as 99%, so colors in movies and games are saturated and very close to what the creator intended to convey.

This year's TCL televisions feature a Filmmaker mode, and it must be admitted that it is definitely the best choice straight out of the box. This is the mode we recommend for everyday watching of movies and series. Unfortunately, as is often the case, the best doesn't mean perfect. In the case of SDR content, the image was too warm because the red was strongly emphasized in the white balance. On the other hand, with HDR content, we had the opposite impression – the image became cooler than it should have been due to excess blue. Additionally, the brightness characteristic sometimes led to highlights being blown out. In practice, this resulted in quite noticeable color test inaccuracies that are hard to accept in a mode advertised as "by the creators."

The first measurements already show that the factory settings of the Philips OLED770 have a lot to improve even in Filmmaker mode. The white balance chart clearly shows a lack of blue, which gives the image a slightly yellowish tint. In practice, the white is not snow-white, but leans towards warmer hues – which some may even like, but from the accuracy perspective, this is a deviation from the norm. The gamma, on the other hand, tends to be on the darker side – the average value is about 2.6 instead of the reference 2.4. In the mid-tones, the image appears muted and more saturated, which may look too "filmic," but takes away some naturalness. However, the biggest issues can be seen in color reproduction. The average error is relatively high, and some colors – especially shades of gray – clearly deviate from what should be seen. In everyday viewing, this means that sometimes colors may look less natural than we would wish.

Thanks to the white balance correction, it was possible to significantly reduce the C6K's tendency to distort colors, which resulted in a very good final outcome. After calibration, we will no longer observe the effect of excessive warming of scenes in SDR or overly cooling the image in HDR. However, it is worth taking a closer look at the brightness characteristics. In SDR content, there are few complaints – the image looks really good, especially in older movies, TV shows, or materials from YouTube. This is much worse for HDR content. Analysis of the EOTF curve suggests that everything is fine, but in practice (EOTF in films), the limitations of the construction become apparent. The TV tends to overly brighten the smallest parts of the frame, and in other situations, it can dim the entire scene too much. The effect of calibration is therefore evident, and in terms of color, the C6K has gained quite a lot, but certain limitations arising from local dimming and, in fact, its management by the C6K simply cannot be overcome.

Philips OLED770 has shown signs from the beginning that it houses significant potential, but it was difficult to fully see this in the factory settings. The image was sometimes too warm, and some colors seemed to have lost their naturalness along the way. However, calibration revealed that it is a television very receptive to adjustments – it reacted to every correction and almost immediately unveiled another layer of its capabilities. The white balance was successfully set both in SDR and HDR, eliminating the yellowish glow and presenting a neutral, clear white. Gamma stabilized closer to perfection, allowing midtones to regain their naturalness, and shadows no longer appeared artificially darkened, possibly even with a slight brightening effect. The effect was obvious... Movies are watched with greater ease; the image has cinematic depth, but without the feeling that something is exaggeratedly darkened. However, the most interesting part was the work on colors. Out of the box, the errors were not dramatic but slightly noticeable – skin tones were sometimes too warm, and gray didn’t always have the shade we expected. After calibration, the error values dropped to around 2, and in many cases even below 1. This is a level significantly lower than the threshold of perception for the human eye. In other words, after correction, the colors finally “clicked” into place. Looking at the screen, we had the impression that the television had begun to speak with a full voice. Like an instrument that has finally been well-tuned.

The TCL C6K performs quite well in terms of scaling. Lower quality materials look acceptable, and the lack of overscan issues means that the image is displayed in full, without cropping. However, one cannot expect miracles – content of very low quality will not gain new life here, as the image processor has its limitations. On thin lines or details, the characteristic tearing is visible, which reveals the absence of advanced image enhancement algorithms. It is also a pity that the C6K lacks the feature for smoothing tonal transitions – in older films or video materials, color banding can be noticeable and may be bothersome during long viewing sessions.

The problem of the previously mentioned color connections can largely be mitigated by the "distortion reduction" feature, which is an algorithm for smoothing tonal transitions in Philips TVs. It works best at a low setting—effectively eliminating unwanted color bands while not introducing strange artifacts or losing image detail. It's one of those features that is truly worth keeping switched on.

The issue with upscaling is somewhat less favorable. The image from a lower resolution can be too soft, while at the same time, distinctive "jaggies" appear in certain areas. The impression is that the algorithm is trying to reconcile two contradictory directions—smoothing and sharpening—and ultimately hasn't found the golden mean. As a consolation, it's worth noting that the television has no issues with overscan, meaning it doesn't cut off the edges of the image, which sometimes happens with other competing models.

TCL C6K features a 144 Hz panel, which is a significant advantage in this price range. This is an important step forward compared to the previous model C655 PRO, which offered only 60 Hz at 4K. The difference is especially noticeable when watching sports or playing games – the ball, athletes, or fast action in a game are displayed more clearly and without losing details. An interesting fact is also the ability of the panel to operate at 240 Hz, which the manufacturer does not mention in official materials. We will return to this topic when discussing the game mode for PC.

TCL also added a feature for movie watchers: "Motion Clarity," which allows you to adjust the image to your preferences using two simple sliders. You can keep the movie frame visible or opt for a very smooth, almost theatrical effect. This way, everyone can find settings tailored to their taste.

The issue of the panel in the Philips OLED770 is not entirely straightforward. The manufacturer claims a 120 Hz panel, but our measurements showed that the screen can accept a 4K signal even at 144 Hz. This sounds like great news – because who wouldn't want an extra mode for PC gaming at this price? However, the reality turned out to be more complex. With 120 Hz materials, the television behaves like most OLEDs – the picture is absolutely clear, with no trace of ghosting or blurring, making it ideal for both fast-paced games and sports broadcasts. The problem arises only at 144 Hz. Unlike models with official support for that frequency, here we observe the phenomenon of so-called frame skipping. This means that the television is unable to display all frames – some of them are skipped, causing the motion to lose fluidity, and double outlines appear on the screen. The effect resembles the operation of the BFI function, which Philips does not offer in this model anyway.

The TCL C6K is a TV that can confidently be called equipment designed for gamers. Here we have 4K at 144 Hz, VRR support, automatic game mode (ALLM), and Dolby Vision Gaming. Additionally, there's a practical Game Bar, a panel with the most important settings readily available – useful when we want to quickly change something during gameplay (e.g., screen aspect ratio: Yes, that’s possible!). The wide VRR range, reaching up to 240 Hz, deserves attention. However, this is mainly an option for PC gamers who drop below the native 4K resolution. Then the TV can spread its wings and show additional smoothness, especially in fast-paced e-sports titles. In the case of consoles, we stick to the classic limit of 120 Hz, but the possibilities are still quite broad. The only drawback is a slight ghosting that can sometimes be seen in dynamic scenes. Other than that, the C6K offers everything gamers expect from a TV.

If someone is looking for a gaming TV, the Philips OLED770 is a candidate that's hard to ignore. The mere fact that we have an OLED here provides a great starting point – perfect blacks and infinite contrast make evening sessions in atmospheric games look like they’ve been pulled straight from the cinema. On top of that, there’s the Ambilight system, which features LEDs on the back of the TV that extend the image onto the wall behind the screen. The effect is such that even regular gameplay in FIFA can look like a small spectacle, and in horror games, the atmosphere becomes really intense. On the technical side, it’s pretty good as well. The Philips OLED770 supports Variable Refresh Rate (VRR) up to 120 Hz, has an automatic low latency mode for gamers (ALLM), and if someone is using an Xbox Series X, they can also count on Dolby Vision support in games. You just need to know that in this mode, input lag is slightly higher than standard, although still at an acceptable level. As a bonus, we get the “Game Bar” panel, which is a special tool strip for gamers. It's not the most conveniently designed solution, but it allows you to check key parameters without leaving the game. In total, this presents a picture of a TV that on one hand has all the most important gaming features, and on the other can add something unique – Ambilight. And it’s this mix of technology and visual effect that makes the OLED770 one of the better screens for gaming in a home environment.