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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  • slyronit - Tuesday, August 23, 2016 - link

    Silly question, why do we do Pentile AMOLED displays? Wouldn't an SRGB AMOLED display allow us to use a lower resolution panel, which will save the GPU a lot of processing and hence power consumption and battery life?

    Is this just an excuse to use 1440p as a marketing gimmick? AMOLED SRGB displays are definitely feasible (My Nokia E7-00 had it 7 years ago).
    Reply
  • iRoNeTiK - Wednesday, August 24, 2016 - link

    I'm wondering the difference between your 2016 vs 2015 battery benchmarks. I see that in your LG G4 review you were using the "2015" benchmarks and LG G4 got 11.37 hours of battery life for Web Browsing over WiFi but in this, it only gets 6.53. Very significant decrease. This is just one phone for example.

    Why would there be a need to change the benchmarks? Were the 2015 test not accurate? By that much? 11.37 to 6.53? Almost half, geez! Any clarification would be appreciated, thanks!
    Reply
  • n13L5 - Thursday, August 25, 2016 - link

    That bendy glass is just a way to get the corners scratched and well, a matter of taste, I guess. I'd rather do without, I already touch the edges of the screen accidentally when handling the phone sometimes, with usually annoying results.

    But ok, the rest of the phone is pretty splendid and I was tempted to overlook that -

    Until I found out the dual-SIM solution is a "hybrid" solution, requiring removal of your MicroSD card to put a second SIM card in. I guess I wait for Sony's next entry with their splendid noise cancelling, which I've always enjoyed on airplanes...
    Reply
  • Bfree4me - Friday, August 26, 2016 - link

    Note 5 Owner here and for a while, because of the retail price of the Note 7. But the reviewer was clearly not feeling the Note and it's his opinion. But I have read countless reviews here and each and everytime Samsung was scrutinized for something. Plastic /Polymer Body, Screen Fit and Finish, overall Size etcetera. Now you guys err guy, has a gripe about the 3D glass sandwiching the aluminum as needed to be overhauled on the next generation. Ahem, this piece of KIT rivals anything on the market right now with exception being the S7. No one has a Water Resistant Unit period point blank! And the SPen is not for everyone, but I use my S-Pen each and every day, as a matter of fact several times a day to cut and paste captions. Yesh, a simple screen capture simply cannot compare to its precision. Samsung can do anything you've mentioned, but there is always a cost benefit associated with said options. Here's it from the head Engineering guy, http://www.theverge.com/2016/8/1/12340294/samsung-...
    Kind regards
    Reply
  • ithehappy - Friday, August 26, 2016 - link

    Sad to see the review only for SD variant, which will be release in two countries only, but whatever. That line there, where its mentioned that scrolling is still not as smooth as expected, how devices like HTC 10 has constant near 60 fps output when it needs come, makes me to not buy this phone. I just don't know what is wrong with Samsung, that they keep their nuisance TouchWiz, and just have no interest to make it smoother and more polished. If you can't do just switch to AOSP, what's the big deal! S Note and all the other Samsung apps could work without heavily modifying the framework right? Darn it Samsung! You choose loads of features over finesse, being a major manufacturer that's unwise, like you said, and I have been saying for as long as I could remember, moment most people start realising how poor TW is in comparison with vanilla Android, let's see where Samsung stock stands after that. Probably I will still end up buying it just because of its display, but that's not the point.

    Exynos review should be there though anyway, as that is the "international" variant, and arguably the better unit than SD.
    Reply
  • Vagabondjonez - Saturday, August 27, 2016 - link

    Htc 10 review... Reply
  • ideamotor - Monday, August 29, 2016 - link

    So .... call reception and volume? I've been through 3 Huawei Nexus 6Ps because everyone I talk to hears an echo, using two different cellular networks. Also, why don't you guys do reviews on DACs or at least point to a review? Reply
  • SanX - Monday, August 29, 2016 - link

    I immediately stop looking at any phone less then 6". Reply
  • lastunas - Tuesday, August 30, 2016 - link

    do you guys have charge time by 25w(12v/2.1a) wall charger? Reply
  • lastunas - Wednesday, August 31, 2016 - link

    do you guys have charge test by 25w(12v/2.1a) wall charger? Reply

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