Display Measurement

The screen of the OnePlus 7 Pro is definitely the key feature of the phone. The 6.67” 3120 x 1440 resolution panel not only represents OnePlus’ highest resolution display to date, but the 90Hz display mode also makes it stand out above any other smartphone currently available.

Display Architecture: 90Hz - But How?

In our article covering the phone’s announcement, a big question for me was exactly how OnePlus had achieved the running of 1440p90 in terms of hardware implementation between the SoC and the panel DDIC. Initially I had theorised that OnePlus would have had to employ a dual-MIPI interface, doubling up on the hardware connections between the two chips.

To my surprise when investigating the device’s kernel source, this actually isn’t the case, and the OnePlus 7 Pro still only has a single MIPI interface to the DDIC. After a bit of research, the only explanation I have is that this must be one of the very first devices in the market which is implementing a newer D-PHY physical layer standard in the MIPI DSI interfaces. The SoC and DDIC must be using either a new D-PHY 1.2 or D-PHY 2.0 standard with much increased data transfer rates.

I was actually quite surprised by this and it’s generally excellent news for the phone as it means the hardware implementation was done in the most optimal way, as opposed to the less efficient dual-interface implementation on some other phones.

I did try to measure what the actual power drain of the screen was, but wasn’t able to get to quite as straightforward results as I wanted. Measuring input power into the phone, the device’s base drain was in line with last generation devices at ~550mW in 60Hz mode. Oddly enough turning on 90Hz had a large effect on the drain and increased base power by ~100mW.

Measuring the power on the device’s internal PMIC however showed good figures in line with the Galaxy S10 at a lower ~400mW, and no noticeable difference between the 60 and 90Hz modes. We’ll revisit this discussion later on in the battery results page, but for the moment I’m more inclined to believe the former (worse) numbers given the results I’ve achieved.

Display Measurement

First of all, let’s go over the fundamentals of the display panel itself. OnePlus promises a lot, and indeed the phone checkmarks almost every feature out there, including high resolution, high refresh rate, and high brightness and support for HDR10+ content.

The device’s screen gamuts are implemented in the traditional style with multiple pre-defined profiles. There’s a “Vivid” mode which goes beyond the DCI P3 standard, and there’s an accurate “Natural” mode that is also colour managed for Display P3 and sRGB content much like on the Galaxy S10.

On top of these, OnePlus also gives an “Advanced” option with sub-selections of the AMOLED, P3 and sRGB gamuts with a custom colour temperature slider. These later modes are quite a disappointment as we’ll see shortly.

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 SpectraCal's CalMAN software.

Display Measurement - Maximum Brightness  

In terms of maximum brightness in manual mode, the OnePlus 7 Pro achieves up to 399 nits on full-screen white, which is in line with other phones which have dedicated high brightness modes in “Auto”. It’s to be noted that OnePlus here is quite a bit brighter than Samsung’s phones.

Display Measurement - Maximum Brightness (Boost) 

When high brightness mode is enabled under high ambient luminosity in the Auto mode, the OnePlus 7 Pro boosts up to ~548 nits. I was a bit surprised at this figure as it is well below OnePlus’ advertised figure of 800 nits at 100% APL. I again dug a bit deeper into the drivers of the panel and saw that the hardware isn’t allowed to go over 670nits in HBM. After further digging I discovered that the brightness behaviour in the Vivid mode is quite different and this actually even activates APL brightness scaling; here the phone is able to reach around the 670nits figure at 100% APL.

So although brightness of the phone’s display isn’t really an issue, it’s not quite as bright as advertised, and it also doesn’t quite reach the levels of some other phones by the competition when in accurate colour modes. Legibility in direct sunlight as captured above in the picture is still very good.


SpectraCal CalMAN
   

We’re measuring Grayscale accuracy in the device’s most accurate default mode; the “Natural” mode. At 200 nits brightness, the phone is showing good results. The biggest issue I see is that it’s veering off towards the warmer side with an average CCT of 6013 – the blues are clearly too weak in this display mode. The core issue here is that colour temperature over brightness isn’t quite linear and the brighter you get, the nearer to the target 6500K you get.

Gamma accuracy is also good, although just slightly above the target 2.2 mark at 2.36 average. The average is pulled up due to the first and last 10% of levels being too dark.

OnePlus had advertised an odd minimum of 0.27 nits in brightness which I had time to comprehend at the beginning. Indeed this mode is only available when enabling “Night Mode 2.0” on the phone, which is essentially the blue light filter mode. Without this, the phone’s minimum white brightness is a regular 1.88nits which is in line with what we see in the industry.

Again we’re seeing black clipping at the lowest intensity levels of the phone. Currently only Apple’s iPhone X and XS series are the only OLED devices on the market to able to handle this characteristic correctly.

Display Measurement - Greyscale Accuracy


SpectraCal CalMAN

Overall the phone’s greyscale accuracy is good and in general most people won’t notice any issues in the “Natural” mode of the phone.


SpectraCal CalMAN
Natural Mode (sRGB)

In terms of saturation accuracy of the phone, we also measure the Natural mode as the most accurate profile, but I want to take a second to showcase an oddity of the phone’s Advanced mode in a second.

In the Natural mode, the phone was excellent saturation accuracy results with a deltaE2000 of 1.24, with only slight deviations in the lower red intensity levels.


SpectraCal CalMAN
Advanced Mode sRGB

What’s really confusing is that the phone’s “Advanced” mode really isn’t that advanced. First of all the default colour temperature in this mode is very much off and too blue. For the above measurement I tried to get as close to accurate whites as I could with the slider (Slider around the 80% mark), however the results were still massively disappointing with results being quite over the place, resulting in a bad dE2000 of 4.22.

Display Measurement - Saturation Accuracy - sRGB dE2000

Nevertheless, I recommend the Natural mode and thus the display accuracy of the OnePlus 7 Pro in this regard ends up as extremely competitive and among the top performers.


SpectraCal CalMAN

Display Measurement - Saturation Accuracy - Display-P3  

The Display P3 gamut is also available under the Advanced modes, although this mode also needed tuning to get to an acceptable colour temperature, and while the saturation accuracy was better than the sRGB mode, it still showcases some of the same deviations in the greens and reds and thus ends up with a dE2000 of 3.14 (yay for Pi).


SpectraCal CalMANDisplay Measurement - Gretag–Macbeth Colour Accuracy


SpectraCal CalMAN

In the Gretag-Macbeth chart of common colours such as skin-tones, the OnePlus 7 Pro ends up with excellent results with a dE2000 result of 1.63. There’s some devices that still beat it, but overall it’s still a fantastic result and should result in visually imperceptible differences to consumers.

Display Conclusion

Overall, the OnePlus 7 Pro’s display is excellent. While it doesn’t really break any records, OnePlus was able to currently deliver the best Android screen this year, besting even Samsung in terms of calibration.

While there’s always room for improvement, the only other issue I’d talk about is that the screen’s side curvature is quite of a larger radius than what we’ve seen from other more recent phones adopting this design. This does result in more reflections.

GPU Performance - Hot Stuff Battery Life - As Expected
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  • zodiacfml - Thursday, June 20, 2019 - link

    Additionally, it is essentially heat that hurts batteries regardless of charging rates. One PLus' implementation of rapid charging might be less harmful or the same as other fast charging techniques Reply
  • cha0z_ - Monday, July 1, 2019 - link

    Correct and at the same time wrong. Yes, heat degrades batteries faster, but it's not the only factor. How fast you put charge in the battery also leads to degradation. Enough materials on the web to explain in details - google it. Reply
  • ZoZo - Wednesday, June 19, 2019 - link

    I bought that phone, tested it for about 30 minutes, then sent it back.
    The curved display is just not for me, especially because they made it so much more curved than on Samsung phones.
    1. Things tend to "fall off" the edges and give the impression that the screen is too narrow, it's annoying.
    2. Colors are shifted on the edges, especially if you don't hold the phone exactly parallel to your eyes. White appears grayish green.
    3. Glare is more frequent as light can be reflected not only from the front of the display, but also from its sides.

    What a waste.
    Reply
  • ZoZo - Wednesday, June 19, 2019 - link

    I'll just add that I don't understand how most reviewers overlooked these problems. Is it just me? Reply
  • RSAUser - Wednesday, June 19, 2019 - link

    Nope, I hate pretty much all curves besides 2.5D since it makes it easier to grip, but it doesn't mean the image display itself has to be curved. Reply
  • GC2:CS - Wednesday, June 19, 2019 - link

    It is good to know that this phone does come with compromises built in, unlike some other sites that make you believe that this phone (like the phone released a week ago) is going to change the whole industry, just because it is cheap.

    Some points
    1. Do you have some power measurements at peak sustained power or it has been done before ?
    -> Am I the only one who thinks that increasing performance on mobile, by implementing heat pipes, coper plates and fans, and run it all as hot as possible is just ridiculous ?!?
    2. This device supposedly comes without display lamination ! Can someone confirm/deny ? OLED's will get destroyed when exposed to humidity.
    3. Regarding high refresh rates, we really need an Apple implementation- custom T-CON, GPU regulating the refresh and continuously variable refresh rate in a wide range (like 24-120 fps) to save energy. To my knowledge this is possible thanks to IGZO backplane iPad pro uses. And no OLED panel is using that yet. Is there a compatibility problem ?
    Reply
  • martixy - Wednesday, June 19, 2019 - link

    I could not care less about the camera and the rest looks like an amazing package(bar lack of 3.5mm), but this is a skip for me because WiFi 6 is on the horizon and I'm going all in when it arrives. Reply
  • Flunk - Wednesday, June 19, 2019 - link

    If I was looking for a new phone right now, this would be the obvious one (I love my OnePlus 5T), but it looks like the price has creeped up to near top-end pricing. Not only that, but OnePlus seems to realize that too with the OnePlus 7 and 7 Pro. Unfortunately the 7 is not available in my market, which is very frustrating. I'd have to pay for a battery-sapping screen and 2 additional novelty cameras that I'd never use.

    All in, if I broke my current phone tomorrow I'd have to go on a hunt for my new phone instead of just going back to OnePlus because this phone is just too expensive and it's only too expensive because of those gimmicks.
    Reply
  • syxbit - Wednesday, June 19, 2019 - link

    >>This is not only because it’s OnePlus’ first ever 1440p screen which is a great improvement in sharpness,

    Can you tell the difference between 1080p and 1440p on a 6" device?
    Reply
  • Andrei Frumusanu - Wednesday, June 19, 2019 - link

    Yes, very much. Reply

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