As we briefly discussed in our look at the specifications, the Galaxy S6 line introduces a newer generation of AMOLED displays, which is said to increase maximum luminance to 600 nits. Samsung claims that this was achieved with the use of new materials, which is likely necessary in order to sustain power efficiency improvements. It doesn't seem that AMOLED is uniquely suited to high resolution, but rather that Samsung Display Corp. is managing to dramatically improve how they make AMOLED displays with every year that offset power consumption increases from higher resolution displays.

To find out how Samsung did, we use SpectraCal's CalMAN 5 Ultimate, in addition to X-Rite's i1Pro2 Basic to characterize displays as accurately as possible.

Display - Max Brightness

From the results Samsung's claims of a 600 nit display are valid in this case, which is a 100% APL white display. It's important to note that achieving this requires the use of auto-brightness, and that manual brightness is limited to a much lower brightness to reduce power usage, here the S6 sees similar maximum brightness as the S5. The S6 edge disappointingly only achieves 272 nits in this mode, a rather low value. I saw color balance shift dramatically in auto-boost mode, which suggests that this operating mode is likely less efficient than manual brightness. As an explanation, we've seen that colors are controlled in AMOLED by voltage while brightness is controlled by PWM (pulse width modulation). As with most recent AMOLED displays, there's no DC bias to the pixels so the contrast really is infinite instead of just a very large number when displaying black.

Galaxy S6

Galaxy S6 edge

Display - White Point

Display - Grayscale Accuracy

Moving on to grayscale, we can see that Samsung has done a pretty good job of controlling the white point and gamma across the saturation sweep, even if green is slightly dominant in both displays. We can also see that there is variation across displays as the S6 edge is closer to neutral while the S6 sample tends a bit warmer.

Galaxy S6

Galaxy S6 Edge

Display - Saturation Accuracy

In the saturation sweep, both displays do an incredible job. I really don't have anything else to say here, because there's really no way to improve on the level of calibration Samsung has done on this display. Unless Samsung calibrates every single display in production, which is wildly impractical and effectively impossible to do, this is as good as it gets for a mass-produced device. Improving past this point will also be incredibly difficult to perceive, which means there's no real reason to go any further.

Galaxy S6

Galaxy S6 edge

Display - GMB Accuracy

In the Gretag MacBeth ColorChecker, we can get an idea for overall color accuracy, which paints a picture similar to the saturation test. The only real problem I've noticed with these displays are the viewing angles, which can produce color shifting when the display is tilted. This is a bit of an issue on the edge variant as I can see that the edges of the display appear somewhat green when viewed head on, but otherwise there are no real issues to be seen here.

Overall, from a color standpoint it’s looking like Samsung has made one of the best displays available on the market today. Color accuracy is at the point where it’s pretty safe to say that the calibration doesn’t have clear color errors, and the peak brightness of the display is incredibly high. The 1440p resolution helps to compensate for the PenTile subpixel layout so in practice it’s effectively impossible to make out any pixels or the subpixel pattern. The contrast remains infinite as with most modern AMOLED displays, and overall it’s really hard to find any issue with the Galaxy S6’s display at first.

However while the S6 edge seems to be without any issues, the S6 does have some odd display issues that can be seen in direct sunlight as seen in the photo above. To be clear about this the photo above is a simple white screen, which should make the image completely homogeneous but instead there are two visible vertical lines and another jagged horizontal line that appear across the display. Inspection under a light microscope doesn’t really reveal what’s causing this, but the defect is quite visible in practice as seen in the photo above. I suspect that defects are rare, and in any condition other than direct sunlight I can’t see this visual problem.

While trying to see what this kind of defect looked like under a microscope, I also went ahead and took some photos of the subpixel pattern. As far as I can tell, it looks like the green subpixels have a bit more variance than what we’re used to as they tend towards oblong shapes rather than circles, which is likely due to the much tighter pixel density. It seems that this variance may cause some color shifting in certain units, which seems to remain a potential problem with Samsung's AMOLED displays. The pixel fill factor still remains surprisingly low when compared to LCDs, which usually have much higher active area. Due to the subpixel arrangement and some other differences in the display design, color shifting also remains higher than one would expect from LCD displays that are found in phones like the iPhone 6.

The final test that I managed to run on the Galaxy S6 is the brightness vs APL test, which shows the advantage of AMOLED’s emissive nature as it can dynamically increase brightness if the entire display isn’t showing a white screen. As a result, this means that in low APL scenarios like dark movie scenes and app themes it’s possible to see a maximum brightness closer to 700 nits or higher. However, in practice the display’s practical brightness is closer to 600 nits.

Overall, the display is still one of the best on the market, but I would be a bit concerned about fill factor for VR applications as that was a problem on the Note 4. Issues like purple smearing have been resolved, but there are still some problems with the display such as color shifting with changes to viewing angles and some variability in display quality from unit to unit. With this generation I suspect Samsung is either meeting or exceeding the best LCDs in quality, and with the next generation of AMOLED it’s likely that high end smartphones will have to migrate to AMOLED to remain competitive.

Battery Life and Charge Time System Performance


View All Comments

  • bogda - Saturday, April 18, 2015 - link

    External SD on Android is mostly for media files so for me capacity is much more important than performance. Songs and videos will play the same regardless of SD speed.I am not going to watch video at 8x speed. Reply
  • Notmyusualid - Saturday, April 18, 2015 - link

    To be honest, I'm happy you are happy with your purchase.

    To me, it looks gorgeous, but it seems a tiny step down from my GS5. No micro sd slot, no removable battery, no waterproofing (a big one this), and I notice the GFX Bench had worse battery life too.

    That record charge time might persuade me, if I were to lose my GS5 drunk etc. But then a second-hand GS5 is a bargin now.
  • ethebubbeth - Friday, April 17, 2015 - link

    My LG G3 has both removable battery and a microSD slot. Here's hoping they continue to carry the torch since it appears that Samsung has dropped it. Reply
  • Ammaross - Friday, April 17, 2015 - link

    We'll find out at the end of the month when they announce the LG G4. I'm waiting to see/hear specs on it (officially) before pulling the trigger with an S6. The loss of the SD slot is a bit painful when you have to pony up an extra $100 for a measly extra 32GB.... Reply
  • akdj - Friday, April 24, 2015 - link

    Or two hundred for incredibly fast internal NAND storage, a bump of 96GB.
    I've owned each iteration of the Note (business line) except Note 2. Still have the Xoom. iPhones, same --- our employees carry them and I use the 6+ as my personal phone. I didn't upgrade Note 1 --> 2, as I couldn't get out of Note 1 quickly enough (contract). Slow as molasses. 2 changed that, and when it was time to get rid of it, the Note 3 was entirely new 'experience-wise' in comparison. Ten times quicker! I've had the Note 4 since release and I've found the further we move up in Android versions, the less 'control' I've had over where and what storage I'm able to keep on the microSD card
    Media, for sure....but for two bills more, over two years is $8/month for 128 GB. I've got the 6+/128 and I've never felt pinched. Even with 3 & 4GB HD movie files I've not compressed. Battery life is incredible on both and other than extended oversea flights I've never had a problem. I also have a TB or 4 at home sharable to the remote phones and tabs from the house but I've never needed to re download extra music or motion while on holiday travel. Best to get out and see the scenery than watch our phones.
    128 is a large chunk of internal data to hold. And it's 'not' expensive. If you're a DSLR shooter and use CF cards, motion, or proprietary capture (P2, SxS, RED's SSDs, etc.) --- you know how expensive a 'fast' card is. Even the quickest can't hold a candle to the latest Sammy and Apple MLC/TLC storage. Stairway to Heaven is going to sound the same when you get home but the ability to capture the shots you want, motion and speeds or different resolutions keep the internal NAND's speeds, reliability and prices continue to rise (first two), and drop (price) for these sealed, internal storage modules.
    As for batteries ...I've also owned each iPhone and other than Mophie cases on the smaller phones, I've found no such need on the 6+, from the scores shown here...that'll be the case with the S6 as well.
  • Peichen - Saturday, April 18, 2015 - link

    Seems like LG G4 will have removable back, battery and a microSD slot according to leaks. Reply
  • Lonyo - Friday, April 17, 2015 - link

    They lost me. My new phone (replacing an S3) arrived yesterday. It has a MicroSD slot and a removable battery.
    I'm using a MicroSD card in it. It's the one I had in my S3.

    Samsung want me to pay $200 premium to upgrade from 32GB to 128GB when I already own 128GB of phone-compatible storage. They can shove it.
  • Notmyusualid - Saturday, April 18, 2015 - link

    +1 Reply
  • juxt417 - Wednesday, April 22, 2015 - link

    Hope you have everything backed up for if/when that bad boy fails. I gave up on SD cards after mine burnt out. Reply
  • ahw - Friday, April 17, 2015 - link

    SD Card slot is the bigger issue, IMO. Samsung has already lost a customer: me. I have an S4 and am eligible for an upgrade. It won't be the S6. Reply

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