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Product test

A lot of power comes from China: TCL's new mini LED TV in the test

Luca Fontana
9.11.2022
Translation: machine translated

It is already big. At least in China and North America. Now it wants to gain a foothold in Europe as well: Manufacturer TCL. With the C93 mini-LED TV, the neo-giant is raising high expectations - but does not quite meet them in the test.

"Mini LED is not just as good as OLED. Mini LED is better," a euphoric Olivier Semenoux, Head of Product Management at TCL Europe, said to me in the interview at the time.

Full Disclosure: The TV, the 65-inch version, was provided to me by TCL for testing.

Design: top of the line and even with improved sound

Truthfully? Anyone who buys a TV in this price category will not be satisfied with only halfway decent TV speakers. I'll therefore omit their in-depth analysis.

Apropos: There are only about three centimetres between the lower edge of the TV and the TV furniture. This can be a problem with some soundbars - such as Sony's HT-A7000, which I recently tested: If the infrared sensor for the remote control is covered, turning the TV on and off becomes a cramp.

From the side, the C93 is quite thin for an LCD TV at 5.8 centimetres. Most are around six to seven centimetres thick. This is due to the additional LED layer that makes the LCD pixels in the panel shine. TCL's C93 also has such an LED layer. Only there are no conventional lamps, but mini LEDs. They not only provide better picture quality, but are above all much smaller. More on this later.

Onto the specs. TCL offers the following:

  • 4x HDMI 2.1 ports (4K144Hz, ALLM, FreeSync Premium Pro and HDMI Forum VRR)
  • One of them with eARC (HDMI 3)
  • 1x USB 2.0 port
  • 1x output for Toslink
  • 1x LAN port
  • 1x CI+ 1.4
  • Antenna ports
  • Bluetooth 5.2

All four HDMI inputs support HLG, HDR10, HDR10+ and Dolby Vision. I think the latter in particular is cool. After all, TCL is one of the few TV manufacturers that does not offer either HDR10+ or Dolby Vision. Then there's Dolby Atmos, including passthrough, in case you want to pass the sound on to an external sound system.

Another thing I like is that it's got Dolby Atmos.

One more word about the weight. The TV weighs 32.4 kilograms. If you want to mount the TV on the wall, you will need a VESA 300×400mm mount. You can find it here in our shop
.

Mini LED in a Nutshell

To explain Mini LED to you properly would take a whole article. Well, I wrote that one earlier. If that's too long for you, here's the shorter form. If you just want to know how good the C93 is, you can skip right to the chapter "Measurements: High brightness, but no peak colour fidelity".

As you can see, thanks to mini-LED backlighting, TCL's C93 can dim locally pretty darn well. This gives it impressive blacks for an LCD TV - and thus better contrasts than its FALD siblings.

Measurements: High brightness, but no peak colour fidelity

What comes next goes even deeper than the mini-LED explanation above. If tables and diagrams don't interest you, you can skip all that and go straight to the chapter "The picture: Beautiful, accurate colours - but only with Dolby Vision". From there on, you'll find my subjective impressions with lots of video material.

Of course, I could only show filmed or photographed displays and point out strengths and weaknesses. Ultimately, however, I would only be reflecting my subjective perception. How bright, natural and true to colour a television really is can also be measured in figures. That has one advantage: numbers are more objective than I am.

I measured out all the screen modes of the TV. From "Standard" to "Cinema" to "Dolby Vision", without calibration or manual changes in the settings. Just like most normal mortals use a television. After all, you want to know whether a TV is accurate and true to colour without expensive and professional calibration. I only switched off the sensors for automatic brightness. Nobody needs them.

The best values for all types of content - except for gaming, for which you should always use the game mode - were achieved with the "Dolby Vision" mode. The measurements listed below therefore always refer to "Dolby Vision". Except where there is no Dolby Vision as an HDR source. In this case, I used the "Cinema" mode.

The maximum brightness

The brightness is important for the TV for two reasons. On the one hand, it affects the contrast value. It determines how many different colours a TV can display. On the other hand, brightness is important if you often watch TV in rooms flooded with light. If a TV is not bright enough, it can be over-illuminated by the ambient light in the room. The picture will then look rather pale to you.

Let's look at the brightness of the C93. In the chart, I compare it directly with Samsung's QN95B, this year's mini LED competitor.

There are two axes: the vertical stands for brightness, the horizontal for the section in which the brightness is measured. At two per cent of the entire screen surface, i.e. selectively and with very small picture areas, TCL's C93 achieves an insanely high luminance value of over 2300 nit, even by LCD standards. And that's in Dolby Vision mode, which is rather darker than the TV's "standard" mode.

It is interesting to compare this with Samsung's QN95B. TCL clearly shines brighter at almost all window sizes. Except at full window size, where the difference shrinks down to a barely perceptible 23 nit. So I wouldn't say that TCL's TV is brighter per se. But TCL has more power where the pixels only need to shine brightly at specific points. For example, with lanterns, a sun or spotlights.

For classification: 681 nit is a lot. If you got 2300 nits on 100 per cent of the screen, it would burn your eyes out of your head. 681 nit, on the other hand, is more than enough to make out something on the picture even in a bright room during dark scenes. A typical characteristic of LCD TVs, by the way. OLED TVs are much less bright due to their technology. A lot of ambient light is therefore a problem for them.

The white balance

White is created on the TV when the red, green and blue subpixels per pixel radiate simultaneously and equally. The full brightness therefore produces the brightest white. The lowest brightness, on the other hand, produces the deepest black. Everything in between is therefore nothing more than shades of grey. The accuracy of white balance is therefore measured with two tables:

  1. Grey scale delta E (dE)
  2. RGB balance

The greyscale dE shows how much the greyscale produced by the TV deviates from the reference value. The RGB balance shows in which direction the greyscales produced by the TV deviate from the reference value. Why is this important? Let's take a look at the concrete C93 example:

If you were to place the television directly next to a reference monitor, this would mean:

  • Value is 5 or higher: most people can tell the difference from the reference monitor.
  • Value between 3 and 5: Only experts and enthusiasts recognise the difference.
  • Value between 1 and 3: Only experts recognise the difference, enthusiasts do not.
  • Value below 1: Even female experts do not recognise the difference.

The colour gamut

To continue with the colour gamut, the coverage of the most common colour spaces: the greater the contrast, the more colours can be displayed and the more natural the picture looks. This is why the gamut is important for HDR content, as its eponymous high dynamic range makes use of large colour spaces.

  • Rec. 709: 16.7 million colours, standard colour space for SDR content such as live TV and Blu-Rays
  • DCI-P3 uv: 1.07 billion colours, standard colour space for HDR content, from HDR10 to Dolby Vision
  • Rec. 2020 / BT.2020 uv: 69 billion colours, hardly used in the film and series industry yet

The large "colour blob", including the darkened areas, shows the full range of colours detectable by the human eye. The lightened area on the left shows the BT.2020 colour space. On the right, the same, simply the smaller DCI-P3 colour space. The white boxes show the actual boundaries of the respective colour spaces. The black circles, on the other hand, show the limits actually measured during measurement.

The measurement resulted in the following colour space coverage:

  • Rec. 709: 100% (good = 100%)
  • DCI-P3 uv: 86.11% (good = >90%)
  • Rec. 2020 / BT.2020 uv: 61.54% (good = >90%)

The C93 thus comes to "only" 86.11 per cent coverage in the important DCI-P3 colour space. That's not outstanding, but still close enough to the benchmark not to pass as insufficient. Nevertheless, Samsung's Neo QLED achieves a very good coverage of 92.49% in this discipline for LCD TVs. OLED TVs even manage a little more. And QD OLED TVs achieve almost 100%.

Much more important, therefore, is the HDR colour space.

Much more important, therefore, is the colour error.

The colour error

For the television set, colours are not colours, but numbers. Numbers that precisely define the colours within a given colour space. For example, fire red. Ivy green. Or cadet blue. When you watch television, these numbers are sent to your television as metadata. It interprets the data and displays them as corresponding colours. Simple. Or?

No. TVs can indeed process and display most signals within the most common colour spaces. But that does not mean that they will accurately represent the colours. Otherwise, the picture would look exactly the same on all televisions. Therefore, the more the colours displayed correspond to those on reference monitors, the truer and better the television.

As with the greyscales above, the deviation of the TV from the reference value is called dE. The white boxes show the reference colours sent to the TV by the test pattern generator. The black circles, on the other hand, show the colours actually measured. Again, dE values below 5 are good for non-calibrated TVs.

dEa BT.2020 Sweeps: 3.41 (max 7.45)
dEa P3 Sweeps: 3.39 (max 6.97)

Reflections

The TCL C93 copes less well with direct reflections than, say, Samsung's S95B. Especially in the evening, the lamp can be really annoying when watching TV. During the day, however, reflections are hardly a problem. This is due more to the high brightness of the TV than to the rather average anti-reflective coating.

Intermediate conclusion after measurement

The picture: beautiful, accurate colours - but only with Dolby Vision

Bright picture. Good colour with Dolby Vision. Less so with rest of HDR content. Theoretically. How does it look in practice?

Colour reproduction

The lack of Dolby Vision format is still one of Samsung's few major weaknesses: TCL's Dolby Vision picture looks pleasantly warm, powerful and yet natural. You can see this especially at minute 3:07 in the video above, if you pay attention to the skin tones and the wallpapers in the background.

Black Crush and Shadow Details

In short: Dark scenes are their parade discipline.

Such as here, in "Blade Runner 2049". In the first comparison between the two mini-LED TVs, you can see well how the higher peak brightness on TCL gives my camera more trouble capturing the brightness properly than on Samsung. Especially in Ryan Gosling's close-up. TCL, however, handles the blooming around the windows a little better. In return, Samsung reproduces more details in the dark areas of the picture.

Brightness gradations

A final image test: Brightness gradations. Due to the technology, it is mainly LCD TVs that flex their muscles here. Actually. In the following "Jurassic World" example, look at the sun in the background: Whereas the sun is clearly visible as a sphere in the firmament on Samsung, it outshines all the details in the sky on TCL. It is quite possible that the brightness control has its difficulties with so much brightness.

It's interesting, though, that Sony's QD OLED panel, of all things, handles the bright picture material best; to me, it seems brighter and yet more natural than its competitors. Especially when I pay attention to the skin tone.

Processor: good but not outstanding scores

The processor is the brain of the TV. Its main task is to receive, process and display picture signals. Processing means that it recognises poor picture quality and upgrades it. At TCL, it sounds like this: "Experience incredible picture details, just as the filmmakers intended. The picture you see is as detailed as in the real world. Dive even deeper into depth and detail!"

Behind all the sensational marketing gobbledygook is that the processor is supposed to remove noise, enhance colours, smooth edges, make motion smoother and add any missing pixel information.

Motion Processing and Judder

Sam Mendes' "1917" is full of such steady, slow-flowing camera movements and thus perfect for the judder test. Pay particular attention to the vertical bars in the barn when comparing it to other producers.

TCL apparently thinks a film has to jerk, nice and cinematic. Like the cinema used to be, before the digital age. But for me, the judder is too much. Fortunately, there are advanced picture settings: Under "Motion Flow", the judder reduction can be set more aggressively. This makes the stuttering less obtrusive - but I can't get rid of it completely.

Next scene from "1917". Again, Mendes' camerawork provides an immense challenge for most processors. Especially with hard edges in front of blurred backgrounds, for example around the helmets of the two soldiers. There, both the processor and the pixels have to react incredibly quickly.

This is where TCL's processor does better, even if it doesn't flex its muscles quite as much as Samsung's or Sony's processor. Nevertheless, the picture flows, but never looks unnatural. In addition, the colour temperature is precisely set. Only in the dark areas do the QD OLED panels play a league above: the perfect black gives the picture that extra punch and adds depth to the scene.

Pixel response time

Not bad, TCL. Because it's hard for LCD TVs to display this scene free of streaks. This is shown by the second comparison with Samsung's mini LED TV. Pay particular attention to the colon there. The QD OLED TVs after that don't give a damn at all. That doesn't surprise me. OLED TVs have excellent response times due to the technology. That's why they are also considered exquisite gaming monitors. LCD TVs are at a disadvantage in that regard.

Upscaling

Now for the most difficult test. This time I want to see how well the processor upscales lower quality sources. Blu-rays or good old live television, for example. Or "The Walking Dead". The series was deliberately shot on 16mm film to create the feeling of a broken, post-apocalyptic world with old-fashioned grain along with picture noise.

Gaming: Input lag and game mode

In fact, with the meter from Leo Bodnar, I measure an average input lag of a very good 12 milliseconds, without seeing too serious a drop in picture quality. Furthermore, the TV supports all features relevant for gamers:

  • 4x HDMI 2.1 ports (4K144Hz / 8K60Hz)
  • Auto Low Latency Mode (ALLM)
  • Variable Frame Rates (AMD Freesync Premium and HDMI Forum VRR)

To this end, TCL - just like LG, Samsung, Sony, Philips and Panasonic - has partnered with many major gaming studios. The result: HGiG - HDR Gaming Interest Group. According to the manufacturer, this should ensure that HDR is displayed as the game developers intended. For example, when playing "Spider-Man: Miles Morales" on my Playstation 5.

I am pleased to note that the colours are pleasantly warm, black is really black, the edges look sharp and the picture does not blur too much even during fast and jerky camera pans. Notice Miles' dark silhouette against the light, the detailed textures of snowy New York or the clearly visible details in the clouds. This is what a good game mode looks like.

Nice: Similar to LG or Samsung, TCL also offers a dedicated submenu in which you can make fine adjustments for gaming and read off the current frame rate. Very important: TCL's C93 supports the new VRR 120Hz mode of the PS5 without any problems.

Smart TV: Google TV

TCL is betting on Google TV. This is Google's own custom ROM layered on top of the open source Android TV software. Or simply put, an operating system that lets you access apps like Netflix, Amazon Prime, Disney+ or the Play Store from one place. The Google TV interface is tidy and displays cross-app movie and series suggestions. So far, so great.

Conclusion: Not yet enough for a top spot

TCL still wants to conquer the European market. They already dominate China. North America too - both markets that have made the Chinese tech company one of the biggest TV manufacturers in the world.

Will TCL also conquer the European market?

Summa summarum: The tech giant can't quite keep up with the top yet. For that, the TV would need a more powerful processor. I can already feel this when I switch it on for the first time while using the Google TV user interface. TCL's vision of being the biggest and most advanced TV manufacturer remains just that for now - a vision.

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I'm an outdoorsy guy and enjoy sports that push me to the limit – now that’s what I call comfort zone! But I'm also about curling up in an armchair with books about ugly intrigue and sinister kingkillers. Being an avid cinema-goer, I’ve been known to rave about film scores for hours on end. I’ve always wanted to say: «I am Groot.» 


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