Display

Moving past the design the next point of interest is going to be the display which is one of the major elements of any smartphone, and pretty much the first thing you’re going to notice when you power on the phone. It’s easy to look at a display and provide some fluff about how the colors pop and how the high contrast leads to dark, inky blacks, but to rely solely on subjective observation really fails to capture the full extent of what a display is really like. If you put two displays side by side, you can tell that one is more visible outdoors, but there’s no way of distinguishing whether this is the case because of differences in display reflectance or display luminance. Other factors like gamut and gamma can also affect perceived visibility which is the basis for technologies like Apical’s Assertive Display system.

In order to try and separate out these various effects and reduce the need for relative testing we can use testing equipment that allows for absolute values which allow us to draw various conclusions about the ability of a display to perform to a certain specification. While in some cases more is generally speaking better, there are some cases where this isn’t necessarily true. An example of this is gamut and gamma. Although from an engineering perspective the ability to display extremely wide color gamuts is a good thing, we’re faced with the issue of standards compliance. For the most part we aren’t creating content that is solely for our own consumption, so a display needs to accurately reproduce content as the content creator intended. On the content creation side, it’s hard to know how to edit a photo to be shared if you don’t know how it will actually look on other people’s hardware. This can lead to monetary costs as well if you print photos from your phone that look nothing like the on-device preview.

To test all relevant aspects of a mobile display, our current workflow uses X-Rite’s i1Display Pro for cases where contrast and luminance accuracy is important, and the i1Pro2 spectrophotometer for cases where color accuracy is the main metric of interest. In order to put this hardware to use we use SpectraCal/Portrait Display’s CalMAN 5 Ultimate for its highly customizable UI and powerful workflow.

Before we get into the results though I want to discuss a few choice aspects of the Galaxy Note7’s display. At a high level this is a 5.7 inch 1440p Super AMOLED display that is made by Samsung with a PenTile subpixel matrix that uses two subpixels per logical pixel in a diamond arrangement. The display driver supports panel self-refresh as a MIPI DSI command panel rather than a video panel. In the Snapdragon 820 variant of this device it looks like there isn’t a dynamic FPS system and a two lane system is used so the display is rendered in halves. The panel identifies itself as S6E3HA5_AMB567MK01 which I’ve never actually seen anywhere else, but if we take the leap of guessing that the first half is the DDIC this uses a slightly newer revision of DDIC than the S6E3HA3 used in the Galaxy S7. I’m guessing this allows for the HDR mode that Samsung is advertising, but the panel is likely to be fairly comparable to the Galaxy Note5 given that the Galaxy S7 panel is fairly comparable to what we saw in the Galaxy S6.

Display - Max Brightness

Display - Max Brightness (Boost)

Looking at the brightness of the display, it’s pretty evident that the Galaxy Note7 is a bright panel, especially when compared to things like the HTC 10 and LG G5. The G5 does reach “800 nits” with its auto brightness boost, but the true steady state is nowhere near that point while the Galaxy Note7’s display can actually stay at its boost brightness for a reasonable amount of time and I’ve never really noticed a case where the boost brightness couldn’t be sustained if the environment dictated it.

Before we get into the calibration of the display it’s probably also worth discussing the viewing angles. As you might have guessed, the nature of PenTile and AMOLED have noticeable effects on viewing angles, but in different ways. As AMOLED places light emitters closer to the surface of the glass and doesn’t have a liquid crystal array to affect light emission, contrast and luminance are maintained significantly better than a traditional LCD. However, due to the use of PenTile it is still very obvious that there is a lot of color shifting as viewing angles vary. There are still some interference effects when you vary viewing angles as well. In this regard, LCDs seen in phones like the iPhone 6s are still better here. You could argue that one is more important than the other so I’d call this a wash, but AMOLED could stand to improve here.


SpectraCal CalMAN

Display - White Point

Display - Grayscale Accuracy

Moving on to grayscale and other parts of the display calibration testing it’s worth mentioning that all of these tests are done in Basic mode which is something I would suggest using in these AMOLED devices in order to improve both calibration accuracy and battery life as brightness is generally controlled by PWM while hue is controlled by voltage, so constraining the gamut actually reduces power draw of the display. Putting this comment aside, the grayscale calibration is really absurdly good here. Samsung could afford to slightly increase the target gamma from 2.1 to 2.2 but the difference is basically indistinguishable even if you had a perfectly calibrated monitor to compare to the Note7 we were sampled. Color temperature here is also neutral with none of the green push that often plagues Samsung AMOLEDs. There’s basically no room to discuss for improvement here because the calibration is going to be almost impossible to distinguish from perfect.


SpectraCal CalMAN

Display - Saturation Accuracy

In the saturations test again Samsung has basically nailed the sRGB gamut here to the extent that it’s going to be basically impossible to distinguish it from a reference monitor. I really have nothing else to say here because Samsung has no room to improve here. Of course, saturation sweeps are just one part of the whole story, so we can look at the GMB ColorChecker to see how well the Note7’s display can reproduce common hues.


SpectraCal CalMAN

Display - GretagMacbeth ColorChecker Accuracy

In the Gretag MacBeth ColorChecker test a number of common tones including skin, sky, and foliage are represented as well as other common colors. Again, Samsung is basically perfect here. They might need to push up the saturation of reds slightly higher but it’s basically impossible to tell this apart from a reference monitor. If you want to use your phone for photo editing, online shopping, watching videos, sharing photos, or pretty much anything where images are reproduced on more than one device, the Galaxy Note7 is going to be a great display. It may not be much of a step up from the Galaxy Note5, but at this point the only avenues that Samsung really needs to improve on is the maximum brightness at realistic APLs above 50% and power efficiency. It would also be good to see wider color gamuts in general, but I suspect the value of such things is going to continue to be limited until Google and Microsoft actually make a serious effort at building color management into the OS. It might also make sense to try and improve color stability with changes in viewing angle, but I suspect that AMOLED faces greater constraints here relative to LCD due to the need to improve the aging characteristics of the display. Regardless, it’s truly amazing just how well Samsung can execute when they make something a priority.

Introduction and Design Battery Life and Charge Time
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  • KoolAidMan1 - Tuesday, August 16, 2016 - link

    Apple is also responsible for Android's abysmal security and its impending botnet apocalypse.

    #illuminati
    Reply
  • Bluetooth - Tuesday, August 16, 2016 - link

    iPhone is twice as fast with the Google Octane benchmark which is the closest to real world usage. I didn't know that Google was optimising their benchmark to make iOS phones leave Android in the dust. Reply
  • trparky - Wednesday, August 17, 2016 - link

    Yeah, I was looking at some of the benchmark numbers and the first thing that came to my mind was "Apple is killing them here, they're just killing them!"

    This is supposed to be the latest and greatest CPU/GPU combination and yet Apple's year old CPU/GPU combination is wiping the floor with Samsung's new phone. Not only is Apple killing them in the browser benchmarks but also in Basemark tests as well. If I was a Samsung fan boy I would be asking why the hell a year old device (iPhone 6s) is seemingly faster than my latest and greatest flagship device.

    Now, a number of users are saying that may be because of the CPU governor that Samsung chose to use as the default CPU governor so as to improve overall battery life but as we can see in some of the benchmarks, Apple is killing them yet the iPhone doesn't at all have issues with battery life. So again, why is Apple killing them with a year old device?

    God, if the benchmarks look this ugly when compared to the year old iPhone 6s I can't imagine how bad it's going to be when compared to the new chip Apple is going to have in the new iPhone 7 (or whatever it's going to be called). If I had to hazard a guess, it's going to be an absolute bloodbath.
    Reply
  • jospoortvliet - Thursday, August 18, 2016 - link

    Everyone should know by now that in single threaded use apple is miles ahead of any android vendors, period. Same with storage performance. Multicore performance, which thankfully is a little more important on Android than on iOS, is better with exynos and friends but that is only a little consolation. Reply
  • Psyside - Sunday, August 21, 2016 - link

    That is pure BS, i got the 8890 S7 and its utterly fantastic and uber fast. Reply
  • jlabelle2 - Monday, August 22, 2016 - link

    Still, it is a little bit sad that, as an iPhone user myself (corporate phone as I am using a Windows phone as a private own), it is now the only thing Apple fans can really brag about. Especially considering that it does not offer any appreciable benefit as most modern flagships are anyway in all practical purpose quick enough for what we are using them.
    Apple can continue to push this CPU race, we just reached a point of diminish return and this is really not what mobile phone needs now.
    People needs smaller phone for a given screen size (iPhone has huge bezel and the Note 7 is a marvel on this regard), they need more battery life and/or better or quicker way to charge (quick charging, wireless charging), they need screen readable outdoor with good contrast (iPhone is good outdoor but contrast is not up to OLED level), they need to be able to perform tasks quicker (camera hardware button, back button, NFC, ...), they need to be able to use their phone with one hand (not having the back link or all the buttons on top like on iOS), they need to be able to take the best pictures possible because this is the camera they are wearing (Apple is still really pushing the envelope with refusing to put a decent camera size sensor in their phone for whatever sake of thinness)...
    Let's be frank, I do not know one single person with a big of brain and common sense that would choose an iPhone versus another Snapdragon 820 or Exynote xxx just for the sake of difference of single thread CPU speed. That is just NOT an argument that register in any meaningful way these days to normal people.
    Reply
  • grayson_carr - Tuesday, August 16, 2016 - link

    How would that help? Even the Exynos S7 doesn't run as smooth as the Moto Z, which is pushing just as many pixels and has s Snapdragon 820. There are two issues, neither of which is the fault of the SD820. First, Samsung phones are bloated with a ridiculous number of features and background services running, which requires more processing power than something running a cleaner build of Android like the Moto Z or a Nexus. Second, because of the extra overhead caused by their software, Samsung has to limit the performance of their chips (both Exynos and Snapdragon) via kernel / governor configuration in order to get good battery life. Samsung could easily tweak the SD820 so that the Note 7 ran perfectly smooth and hardly ever dropped frames. The SD820 is easily capable of that. But if they did that, then the Note 7 would get below average battery life. It's all about priorities. Samsung is betting that their users will prefer good battery life and some minor stuttering here and there over below average battery life and a perfectly smooth UI. I mean, yes, the Exynos is more efficient than the SD820 so they didn't have to limit its performance quite as much to achieve good battery life, but even the Exynos is performing far below it's potential because of Samsung's heavy software and desire for good battery life. The fact that the Moto Z runs smoother than even the Exynos S7 is proof. Reply
  • mrochester - Wednesday, August 17, 2016 - link

    Why can't we have both like the iPhone? Too many compromises. Reply
  • Psyside - Sunday, August 21, 2016 - link

    NVMe storage, the A9 is far bellow 8890, the storage is the key. Reply
  • trparky - Wednesday, August 17, 2016 - link

    But that doesn't explain why the iPhone 6s appears to be wiping the floor with this device and yet iPhone 6s users often enjoy some of the best battery life numbers in the industry.

    Again, as I said above... If I was a Samsung fan boy I would be asking why the hell a year old device (iPhone 6s) is seemingly faster than my latest and greatest flagship device.
    Reply

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