Display Measurement

The display on the Axon 30 Ultra is a 6.67” 2400 x 1080 AMOLED that goes up to 144Hz refresh rate. ZTE doesn’t have any special claims about the display beyond that it also supports 10-bit colour depth, so we don’t expect any newer display technology such as modern emitters or more efficient backplane materials.

Design wise, the display is great and has also very good viewing angles. The 1080p resolution is stretching things a bit thin at this size and people buying the phone will have to keep this in mind – personally I don’t find it quite enough due to my habit of doing lots of reading in the evening with the phone close to my face, but many other people with more general usage at hand held distances will be plenty satisfied with the density.

In terms of colour calibration options for the display, ZTE’s myOS gives you a more simplistic settings menu: The top slider of “Colourful”, “Standard” and “Soft” change the colour gamut between something that exceeds the P3 colourspace but below that of BT2020, a P3 gamut calibration, and an sRGB gamut calibration. For our testing we’re using the “Soft”/sRGB calibration for testing.

Additionally, ZTE gives us a colour wheel and colour temperature slider, more on this in a bit.

We move on to the display calibration and fundamental display measurements of the Axon 30 Ultra screen. As always, we thank X-Rite and SpecraCal, as our measurements are performed with an X-Rite i1Pro 2 spectrophotometer, with the exception of black levels which are measured with an i1Display Pro colorimeter. Data is collected and examined using Portrait Display's CalMAN software.

Display Measurement - Maximum Brightness

In terms of brightness, while the phone is in line with other industry devices in manual brightness, coming in at 484 nits full screen white, its actual auto brightness boost levels aren’t too convincing as they only reach 606 nits, which is below that of flagship devices of the last few years. It’s still a bright display, but won’t be competitive in very bright sunlit scenarios.

Portrait Displays CalMAN

In the greyscale results, the out of the box default mode of the phone is pretty bad as it veers off to very blueish tones, with 6949K whites and average colour temperatures of 6715K across the levels.

Furthermore, the gamma curve also isn’t very consistent at all in our 50% window 50% APL test patterns, with non-linear results. Both the colour inaccuracy and the gamma error result in quite bad results in terms of the dEITP figures.


Usually, we don’t publish review calibrations as vendor’s controls makes things incredibly hard to replicate – this is also the case here with ZTE: the margin for hitting that exact spot that I’ve used for accurate colour temperature is very hard to hit on the Axon 30 Ultra as the colour wheel has some large implementation bugs that result in very different results when the selector is just a few pixels apart on the outer rim of the colour wheel. Still, generally hitting that area gave me the best results on our device.


Portrait Displays CalMAN

The custom setting nearly eliminates all colour errors and we get near perfect whites at 6523K. The gamma error unfortunately is still there but we can’t do much about it.

Portrait Displays CalMAN

In the default settings the error rates are extremely high due to the offset white point.

Portrait Displays CalMAN

In our custom white point, we’re able to get pretty good results, although we see that blues and yellow are off-hue by a larger margin and this has a larger impact on the overall error rate. This is something that can’t be corrected with the given controls.

Portrait Displays CalMAN

Here’s the GMB results at the default “Neutral” white point in the Soft profile.

Portrait Displays CalMAN

And our custom white point calibration, which dramatically improves the error rates, at least as far as possible.

Overall, the display of the Axon 30 Ultra is relatively mediocre by flagship standards. While viewing angles are good, it doesn’t reach the brightness of the competition. Furthermore, ZTE’s colour calibration out of the box is amongst one of the worst we’ve seen in recent years, having no way to pre-set a somewhat accurate white point. Luckily, I was able to calibrate it manually to a reasonable colour balance, but that’s not something that should be left up to customers to do.

GPU Performance Battery Life - Mediocre
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  • warisz00r - Friday, July 30, 2021 - link

    "somewhat particular device"
  • coburn_c - Saturday, July 31, 2021 - link

    From across the specific ocean.
  • dotjaz - Friday, July 30, 2021 - link

    "Surprisingly Different"

    And unsurprisingly lacking on software support.

    Seriously, it probably cost an extra $100000 to offer one more update and one extra year of security. That's maybe $1 per phone. Just charge the extra dollar or five.
  • sabot00 - Friday, July 30, 2021 - link

    No way. An extra year of support is easily 5-10 million USD. Even if dev work was free, the cost of carrier certification is huge.
  • linuxgeex - Friday, July 30, 2021 - link

    Except that with project treble all the components which are involved in carrier certification do not change with security updates. Carrier re-certification revolves around the baseband, which rarely changed even before project treble.
  • jvl - Saturday, July 31, 2021 - link

    So charge 5 USD more. Or 10 USD more. Which is exactly what OP proposed.. (Nonwithstanding below's comment)
  • Samus - Sunday, August 1, 2021 - link

    Agreed. If PR honestly pitched these things with guaranteed software support for 3-4 years I don't think an extra $5-$10 would phase anybody, especially since nobody (other than Apple I suppose) does that.
  • Silver5urfer - Friday, July 30, 2021 - link

    Why should anyone buy this device which has literally same lack of feature set from HW perspective = no 3.5mm jack, no SD card slot, questionable servicing support and OS support. For that cash I'd get a Sony Xperia 5 Mark III. Which has everything this phone lacks and even better Front display due to no hole or such.
  • neothe0ne - Friday, July 30, 2021 - link

    Agreed. Xperia 5 III is also likely to end up being supported on AT&T's network from February 2022 onward. I don't see any ZTE Axon on the list so far.

  • drajitshnew - Friday, July 30, 2021 - link

    @silversurfer I absolutely agree about microSD cards and 3.5mm Jack. I bought my currently phone because it had a flagship-eque chipset and 3.5mm Jack support.
    I thought that 256GB flash would alleviate the need for micro SD. As I described above though it required a factor reset and 2 (two) complete re-imaging. And I think it be would have been a LOT less painful if it had a microSD. At the same time I guess we as consumers have to accept

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