Philips OLED950 vs TCL A400 PRO

OLED950 is a phenomenal TV for consuming content in HDR format, primarily thanks to the use of innovative Tandem OLED technology. With this technology, the screen can generate astronomical brightness levels, reaching over 2000 nits in movie scenes (on test patterns). This is an outstanding result that places the OLED950 model among the elite displays available on the market. However, it is worth noting a specific aspect of this solution – at moments when full-screen flashes of light appear, brightness can drop by as much as half. Nonetheless, it is important to highlight that levels above 1000 nits on a full screen are still an outstanding result. This allows HDR content to be displayed exactly as filmmakers intended, maintaining the dynamics and impact of bright scenes.

The use of Tandem OLED technology also brought tangible benefits in terms of colour reproduction, improving elements that traditional WOLED panels had issues with compared to QD-OLED competition. In the case of the OLED950, the colour gamut coverage is wider than in classic WOLED panels, reaching nearly 100% of the DCI-P3 colour space and a solid 82% of the demanding BT.2020 palette. While these results still do not match the highly refined achievements of QD-OLED panels, the difference becomes less noticeable during real-world use. We cannot deny that in the vast majority of films, colours look simply fantastic on this model – they are saturated, vibrant, and full of depth.

The TCL A400 Pro is a moderately bright TV. Its peak brightness reaches around 600 nits. That level already allows for a real HDR effect and in many films it does deliver a noticeably more appealing picture than in SDR. However, it’s not a level that dazzles by brightness alone. The A400 Pro is not one of those TVs that bombard the viewer with a powerful flash in every dramatic scene. The biggest limitation is visible with small bright elements on a dark background. Because of fairly aggressive zone control, the TV can significantly reduce their brightness, in extreme cases down to around 100 nits. That means small lights, sparks, stars or single highlights can be much less visible than they should be. It should be added, though, that this isn’t done without reason. The A400 Pro does this to keep black levels as deep as possible and to limit the halo effect around bright objects. It’s a deliberate compromise: the TV more often opts for deeper blacks rather than maximising point highlights. On the one hand this is understandable, especially given a limited number of dimming zones, but on the other you should be aware that the HDR effect won’t always be as strong as the peak brightness alone might suggest.

On the plus side, the colours are a strength. The PFS LED filter used here, marketed by the manufacturer as QLED, delivers suitably saturated colours. Our measurements showed about 94% coverage of the DCI-P3 gamut and around 74% of BT.2020, which is a solid result for this class.

We tested the OLED950 model in Film mode. Although it is intended to be the best and most accurate preset on this television, in practice, it proved to be not without flaws. Interestingly, in the specimen we tested, the biggest challenge was not the white balance itself – although it did show a slight tendency to give the image a pinkish tint. The main issue lay in the way the television managed brightness, both in everyday SDR content and in demanding HDR scenes. Analysis of the gamma chart and the EOTF curve leads to one key conclusion: the television excessively exposes brightness in the lower registers. This results in the image appearing less contrasty than what the panel technology allows. Details in dark areas, which should remain perfectly dimmed (the characteristic "OLED black"), are simply unnecessarily highlighted and brightened. Fortunately, these errors can be corrected using the appropriate tools, so – as always – we proceeded with professional calibration.

As usual, we carried out colour measurements in the best‑tuned picture mode, Filmmaker Mode, the one intended to be closest to the creators’ intentions. The A400 Pro, of course, also offers other picture modes, but in practice they show much larger colour errors and interfere more with the image character. So we won’t cover them in detail in this part of the review. How does the factory colour reproduction fare? In short: really very well. In fact, looking at our measurements, it’s excellent. Both the white balance and the luminance response were set surprisingly precisely. The errors were so small that during the measurements we genuinely rubbed our eyes in surprise. Such good factory settings don’t happen often, even in televisions running Filmmaker Mode. All the more reason to praise TCL, because the A400 Pro straight out of the box can produce an image very close to how the source material should look. The results were so good you could easily think someone had already given this unit extra attention and tried to calibrate it. Our one bit of nitpicking comes down to a single issue. In SDR material the image was slightly brighter than the reference for a dark room, because the factory gamma was set closer to 2.3 than 2.4. It’s not a large error and most viewers probably won’t even notice it. We should note, however, that we are talking about our specific test unit. There can always be some variation in factory colour between individual units, production batches or screen sizes. We do not assume every A400 Pro will look identical straight out of the box.

As you can see, the OLED950, after a professional calibration process, becomes an absolutely phenomenal display that, without a shadow of a doubt, can be placed alongside the best televisions currently available in the world. This equipment needed only a professional touch to showcase its full potential and eliminate factory shortcomings. The residual errors in the Color Checker tests and the fidelity of the colour palette speak for themselves. We are dealing with an almost perfect device here. A true window to the world, offering image quality of the highest order.

Despite the outstanding factory tuning, we couldn't resist checking how the TCL A400 Pro would respond to professional calibration. With such a strong starting point, we were especially curious whether we could squeeze even more from this TV. And here we have to boast: we managed to bring our sample to absurdly low colour errors. Results below 1 are something you don't see every day, even on very good TVs. Such outcomes are more often associated with professional reference monitors than with a lifestyle TV for the living room. In terms of white balance and colour reproduction, the A400 Pro after calibration simply excelled. The only thing we can pick on after closer analysis concerns the brightness response. The TV can vary the luminance level depending on the content being displayed, and quite often the picture is a little darker than it should be according to the reference. This most likely stems from the way the Mini-LED backlight and the local dimming algorithms work in this model. That said, it doesn't ruin the overall impression, because in terms of colour precision the A400 Pro after calibration reached a level that was genuinely hard to expect.

Upscaling

In terms of the scaling of the image, the proprietary P5 processor performs just as well as in most of the manufacturer's models. Lower resolution content gains a very soft and plastic character. This presentation will certainly appeal to many people. However, if you prefer sharper contours, you can gently enhance them using the appropriate slider in the TV menu. In this aspect, it's really hard to nitpick. The image simply looks very good and additionally, there are no issues with overscan.

Smoothing and Distortion Reduction

The smoothing of tonal transitions performs somewhat worse. In the settings, we find an option called "Distortion Reduction." This allows for a three-level adjustment of the processor's intervention. Unfortunately, the Minimum setting works poorly and the smoothing effects are minimal. The Medium level gives a decent result, but it also begins to smooth out the details of the actors' skin. On the other hand, the Maximum setting works too aggressively. It removes far too many details from the face and background elements or can even eliminate film grain. To achieve the optimal effect, it's worth playing around with these settings at home and adjusting them to your liking. It might seem that the Medium option represents the best compromise here.

Digital image processing is unfortunately one of the weaker points of the TCL A400 Pro. That does not mean the TV performs badly, but it’s hard to call it anything clearly above standard. The upscaling itself is acceptable: edges are fairly well smoothed, the picture does not look overly sharp or “pixelated”, and lower-quality material can be watched without major discomfort. At the same time the overall image has a slightly soft character and you don’t see the kind of precision that the best image processors in more expensive TVs can offer.

Handling of tonal transitions caused by heavy compression is much worse. TCL equipped the A400 Pro with a “Gradual Smoothing” feature that in theory should reduce visible colour banding and artefacts in lower-quality material. In practice, however, its effectiveness is very limited. It does not improve tonal transitions in any noticeable way, and at higher settings it can further smooth image detail, giving it an artificial, slightly blurred character. For that reason we think it’s best to leave this feature off. The A400 Pro copes decently with basic image scaling, but if you often watch heavily compressed material with visible posterisation, this model will not be one of the best choices.

The motion reproduction on the OLED950 model is simply perfect. This is typical for screens of this kind (OLED 120Hz+), as the panel shows no motion blur at all. This allows us to enjoy perfect sharpness in practically any conditions. A significant part of this is due not only to the nature of organic technology itself. Equally important work is done here by the smoothing systems employed by the manufacturer.

The TCL A400 Pro is equipped with a 144 Hz panel, but in practice we're most interested in how it performs at 120 Hz. That's the refresh rate most consoles, as well as many sports broadcasts and high-motion sources, are limited to today. In that range the TV performs quite well. Motion clarity is really good, especially after properly configuring the motion smoothing. The 'Motion Clarity' function improves smoothness. Its settings include two sliders that let you tailor the motion smoothing to your preferences, separately for low-frame-rate and high-frame-rate content. This allows you to achieve either a more cinematic look or a noticeably smoother image. If you don't want to fiddle with manual configuration, you can use built-in presets such as Low, Medium, High, Cinema or Nature.

OLED950 is almost the perfect television for gamers. This is due not only to the unique atmosphere created by the Ambilight system during gameplay. The most important aspect here is the solid hardware support. We literally have everything you would expect from a modern gaming display. The manufacturer has implemented two HDMI 2.1 ports with full bandwidth of 48 Gb/s. This gives us access to gaming in 4K resolution at 120 frames per second. There is, of course, support for VRR technology and the automatic game mode ALLM. The device handles any HDR signal with ease, whether we’re using Dolby Vision or the HGiG standard.

We have access to all settings from one place thanks to the special Game Bar overlay. While this interface may not be the most graphically attractive on the market, it fully accomplishes its task. It displays all the important signal parameters and offers useful additions. Gamers can take advantage of the minimap zoom function or add a fixed crosshair on the screen, which can be seen as a small aid in online competition. The adjustment of contrast range also proves to be useful. It allows you to brighten shadows and achieve better visibility of enemies hiding in dark corners of the map.

In terms of gaming features the TCL A400 Pro performs brilliantly. The TV has practically everything you’d expect from a gaming TV today: support for 4K at high refresh rates, VRR, ALLM, correct implementation of HDR formats in games, including Dolby Vision, and HGiG. That means it works well with both next‑gen consoles and PCs. Another plus is the inclusion of a Game Bar, a dedicated panel with the most important settings for gamers. From it you can quickly check basic information about the signal, refresh rate or active features, and customise the appearance and behaviour of some settings to your preferences. It’s a solution that may not change picture quality by itself, but it greatly improves the convenience of using the TV while gaming. The only thing to criticise is the number of full HDMI 2.1 ports. The A400 Pro has only two such ports out of four, and one of them also serves as eARC. In practice this means that if you want to connect two next‑gen consoles and a soundbar you may run into some limitations. In that scenario you’ll need to either swap devices or use extra equipment, such as an AV receiver or a soundbar with HDMI inputs. Even so, it’s hard not to rate the A400 Pro very highly as a gaming TV. The gaming feature set here is genuinely powerful.