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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  • lilmoe - Tuesday, August 16, 2016 - link

    SD820 has the power more fluidly? Yes. Better than Exynos? Ummm... No.
    If you want smoother UI and better touch response, root and change the governor to Performance, or Ondemand.
    Reply
  • lilmoe - Tuesday, August 16, 2016 - link

    I've dug a little deeper into this after I bought my GS7e (Exynos). Looks like Exynos (and it's higher count of cores) plays better than the Snapdragon with the Conservative Governor that Samsung employs to save battery life. You can manually switch it to Ondemand, Interactive, or even better, Performance (eliminating most of the UI performance differences, and increase the responsiveness of the device drastically). But battery life would take a major hit, just like every other Android device with a 1440p screen.

    What needs to fixed and optimized is ANDROID. Google still insists on doing a crappy job with their OS, just like with their browser.
    Reply
  • lilmoe - Tuesday, August 16, 2016 - link

    "What needs to fixed and optimized is ANDROID. Google still insists on doing a crappy job with their OS, just like with their browser."

    What also needs to be fixed is the "higher resolutions screen is better" mentality. No smartphone should have more than a 1080p panel for optimal performance and efficiency.

    There's absolutely no mention of the new power saving features that the new version of TouchWiz employs; like scaling down the resolution and how much more battery life you get out of that. Guess I'll have to test it myself when my GS7 gets the update. I'm soooooooooooooooooooooo scaling back the resolution to 1080p while leaving processing power intact.
    Reply
  • InspectHerGadget - Wednesday, August 17, 2016 - link

    Yes. The extra screen resolution is not worth the hit on battery life. Android and Samsung are also both to blame for poor optimisations. I had the Nokia 1520 which had great battery life, then the Note 5 which had only so so battery life, now the iPhone 6S Plus which has great battery life. On the Note 5 if I left the hotspot on it would get hot and drain the battery even when my Microsoft Pro 4 was in its case. I just felt too many rough edges on Samsung phones I had. Reply
  • jospoortvliet - Thursday, August 18, 2016 - link

    Remember, guys, amoled isn't hit by lower efficiency on higher resolution, that is only an LCD problem. Now granted the gpu and cpu have to work a little harder but 1080P wouldn't look nice with pentile and Samsung does pentile to get a better endurance/longevity and brightness out of AMOLED. I don't think they made the wrong choice here. And yes, 1440P on an LCD is stupid. Reply
  • lilmoe - Tuesday, August 16, 2016 - link

    Sorry, the governor they use is Interactive, not conservative... Reply
  • jospoortvliet - Thursday, August 18, 2016 - link

    Then it shouldn't be an issue and if it is - they shold fix the governor not switch to performance. The performance governor is barely faster at big costs. Reply
  • lilmoe - Thursday, August 18, 2016 - link

    It doesn't act like an Interactive governor would act at all, it's very slow to ramp up clock speed, and most ramps up the little cores. It's a good thing for battery life, but not as good for fluidity. Reply
  • jospoortvliet - Thursday, August 18, 2016 - link

    IMHO the on demand governor should really not be costing battery life. It was designed to be a good balance and it generally is, at least on desktop.

    Then again with such an outdated kernel with patches who knows what is in there... wish the android vendors would get their stuff up streamed more timely...
    Reply
  • grayson_carr - Tuesday, August 16, 2016 - link

    It's a conscious decision happening at Samsung. They could tweak the kernel / governor configuration so that there are almost no frame drops and slowdowns, but it would come at the cost of battery life. Samsung is aiming for the minimum performance they think their users won't be annoyed with in order to maximize battery life, which Samsung assumes is more important to the average user. Google on the other hand configures their devices so that they maintain 60 fps in most scenarios, and their battery life suffers for it. I personally prefer Google's approach because I value a smoother and stutter free UI more than a little extra battery life, but I think a lot of people who buy Nexus devices are baffled as to why the battery life isn't as good as their Samsung phone even though the battery is just as large. Those people may prefer battery life over the smoothest UI possible. Reply

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