Display

As with just about everything these days, display matters quite a bit. In a lot of ways, the wearable segment has display requirements similar to the smartphone space. However, unlike the smartphone space it isn’t necessarily critical to have the highest possible resolution, and it isn’t necessarily crucial to have perfect color calibration as in most cases wearables won’t be used for color-critical applications.

In the interest of addressing this, for the near-term we’ll continue to use the standard smartphone workflow, but I hope to expand the testing done here as wearables develop. For now, we’ll continue to do the standard brightness and accuracy testing, but I’ve removed the grayscale test as it strongly emphasizes gamma accuracy. Although it is important to not have obscenely incorrect gamma curves, wearables generally have to prioritize readability over dynamic range, which means that near-black colors would be brightened to try and overcome background reflectance. Similarly, we won’t be placing dE2000 average error in our Bench comparison tool or in graphs, as something like the Apple Watch cannot have controlled display brightness.

As a result, we can’t really be 100% sure that gamma tests and other tests of luminance are actually accurate when automatic brightness means that any inconsistency in light to the sensor will affect display brightness, which will strongly affect dE2000 results.

In the case of the Apple Watch, the display is interesting because this represents the first AMOLED display to ever be used in an Apple product. As far as I can tell, this is an LG OLED display with an RGB subpixel arrangement, but it isn’t quite the same as a traditional RGB stripe. I suspect that for the near future we will continue to see the use of this subpixel arrangement as the resolution of the Apple Watch doesn’t really allow for a PenTile layout. Given the current state of AMOLED (as evidenced by the Galaxy S6) I believe it is effectively the future of mobile displays, and it seems that whoever makes these decisions at Apple agrees as well.

As I mentioned in the start of this section, the Apple Watch also doesn’t have any way of manually setting brightness. You get approximately three choices of auto brightness algorithms, which bias the brightness curve of the display appropriately.

In practice, I didn’t actually care that manual brightness was gone on the watch because I never actually used manual brightness on the iPhone or any phone that has at least a halfway decent auto brightness system. In every phone I’ve ever used, the only time I use manual brightness is when the auto brightness system is clearly programmed wrong in some shape or form. Common cases where this would happen include auto brightness that didn’t actually set the display to maximum brightness in daytime or wouldn’t set the display to minimum brightness in absolute darkness.

Thankfully, the default auto brightness setting on the Apple Watch doesn’t have any of these problems, although for reasons unclear minimum brightness changes depending upon the brightness setting that is selected. As a reviewer though, it would definitely help if the watch had a manual brightness setting for more precise display testing and battery life testing. I’m sure that the precision of the digital crown would allow for precise brightness settings as well, but I suspect that this would have some very real potential to affect practical battery life as I’ve seen more than one person walk around with their smartphone display permanently set to maximum brightness because of reasons.

There’s also the issue of reflectance, which could be a problem given that the two higher-end models use a sapphire crystal glass on the display instead of traditional hardened glass. I did notice that reflectance is much higher than something like the iPad Air 2, but I never really felt like the reflections completely washed out the display. The reflections also indicate that the watch has a properly laminated display, without issues involving index of refraction mismatch. However, if people are worried about outdoor visibility Apple Watch Sport should be better given the use of more common aluminosilicate glass. I’m not sure if Apple has actually loaded different auto brightness algorithms for the Apple Watch/Watch Edition compared to the Watch Sport to try and compensate for this though, and I suspect such a change would be difficult to test for as well.

Although reflectance is one aspect of outdoor visibility, the other is display brightness. This is probably the only aspect of the Apple Watch where I can get consistent and repeatable results. Unfortunately, given that we haven’t actually done any other full-featured wearable reviews I’ll have to reference smartphones to get a good comparison point. As the Apple Watch display is already quite small, we won’t be able to get accurate APL vs brightness readings as it’s impossible to hold the meter in a repeatable position that isolates ambient light while also holding an LED to the display.

At any rate, the Apple Watch gets respectably bright at around 460-470 nits, although not quite the ridiculous 600 nits that the Galaxy S6 can achieve. At this full white display, I recorded a color temperature of 6891K, and 6883K at the ~100 nits that was used for the remainder of display testing. It’s important to keep in mind that these values are only at 100% white, so this isn’t the average color temperature that we normally list in reviews. Of course, this display’s contrast is also infinite, with no visible residual brightness on pure black images.

Saturation Sweep

Moving on to the saturation test, we can see that Apple has put a huge amount of effort into calibrating these displays, which is somewhat surprising given that one might expect wearables to not be all that critical when it comes to color accuracy. In my experience, I never actually bothered looking at photos on the watch outside of the messaging app and Twitter. I suspect that this was done in order to make it so that images look the same across all Apple devices, as something would seem “off” in most photos taken by an iPhone 6 if displayed with an Adobe RGB gamut. In this test, the dE2000 average error was 2.33, and as one might guess from the photo above most of the error was concentrated in blue, which appears to have some gamut issues as the native gamut appears to be wider than sRGB but not enough to completely cover sRGB.

GretagMacbeth ColorChecker

The GretagMacbeth ColorChecker test reveals a similar surprising level of attention to detail in color calibration. Color accuracy isn’t quite on par with the very best, but given that this is a first generation product I’m really surprised that the display is already receiving this much attention with an average dE2000 error of 2.42. Overall, this means that the display has relatively little perceivable error for sRGB content, which is the standard almost across the board, although wider gamuts like Rec. 2020 or Adobe RGB may one day supplant sRGB.

Overall, I’m impressed with the quality of the display of the Apple Watch. The AMOLED panel could probably reach a 600 nit max with sufficient progression in emitter technology from LGD, but I suspect this will take some time. The calibration is also incredible for a first-generation wearable, and the use of a full RGB subpixel helps to avoid a lot of the aliasing issues that tend to plague PenTile or other RG/BG subpixel arrangements at these relatively low pixel densities.

The reflectance of the sapphire lens on the display is a bit high and could probably benefit from anti-reflective coatings of some sort, but given that I haven’t had to worry about scratching the display thus far it’s probably a fair trade as a screen protector will usually increase reflectance noticeably. It’s also a bit annoying as a reviewer to not have manual brightness settings, but as an end user I never felt the need for manual brightness as the auto brightness algorithm works quite well.

Ultimately the entire user experience around the display in every aspect is well-executed, although there is still room for improvement on the technology side of things.

Apple Pay and WatchOS Final Words Battery Life, Charge Time, Taptic Engine, and Misc. Thoughts
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  • mjh483 - Friday, July 24, 2015 - link

    Amazing review. Really great. I think this review is a perfect blend of geeky and non-geeky explanations about why the Apple Watch exists. Simply amazing. Thank you so much. Reply
  • bernstein - Monday, July 27, 2015 - link

    once again: amazing review! love the thinking about having to sell people on watches again.

    where among the 35+ crowd wearing a watch is still very common, in the in 30- crowd its become very uncommon...
    Reply
  • alexb1 - Tuesday, July 28, 2015 - link

    OMG, are you KIDDING ME? I knew Anandtech will not be the same after it was sold off.

    Here's the deal, you FOROGT COMPLETELY about the COST of this thing... Apple Watch maybe one of the better attempts at SmartWatch, but it costs easily $700-1000 for a nicely setup one (like the reviewed item), and it does ZILCH for that $1000 without an iPhone...

    I got one through work, and used it for a couple of weeks, then forgot to charge it and went back to my regular watch and haven't looked back. It's an ACCESSORY, and as an accessory can't possibly cost $700 or so, if it was $250, it'd be a fantastic item and would have sold a lot more and they would have not had to HIDE the #of watches sold.

    Here are my Top10 biggest problems with Apple Watch:

    1. 42mm is too small, and I have a medium wrist, my index covers half the screen. It's way way too small! It should have been 42, 48 to fit on everyone's wrist, yet readable/usable
    2. 18hrs battery life is too short - It's too short in case you forgot to charge it one night (needs 2 days to be acceptable)
    3. If it can't do 2days, 18hrs battery life is not needed - They achieve 18hrs with ridicolous battery saving, making the use of the watch very challenging, like you can't look at the screen over a cpl of seconds as it will go away, like when I was biking, it was almost impossible to turn the screen and look at what time it was, had to bend the wrist in an awkward way while on the move. The battery saving should be customizable, as I rather have 14hrs of full use with longer display times than 18hrs, as I would never wear it 18hrs straight, usually after 12-14hrs, it's being charged
    3. It does NOTHING that your iPhone doesn't do
    4. Heart rate monitor works only while you are sitting still! Like seriously?
    5. If you get a lot of notifications, it becomes very very annoying, no way to make it selective
    6. It is NOT waterproof
    7. It is UGLY, UGLY, UGLY... I am sorry, I AM a watch wearer, and this thing is just a black screen on a band! Again due to the crazy battery saving, it's almost always off, so nothing on the face of the watch which is THE key for looks of a watch, and this is always black. Now, I admit, nothing else I've seen is that great either (Moto360 maybe), but coming from Apple, this thing is just ugly
    8. Apps, there's no app that does anything better on the watch than on the phone
    9. Weak processor, capabilities. We developed 6 apps for the watch, and it couldn't even render basic business charts, and installation would take minutes! We had to completely do all of the processing on the phone and just send the completed data/visuals to the watch. It's absolutely inadecuate for any serious computing, plus having a terrible SDK!
    10. Last, but not least, It's damn too expensive! I really find it hard to believe not more reviewers have taken an issue with the cost, it's absolutely ridiclously priced, and PLEASE do NOT try to compare it with hand-made Swiss watches made in small numbers or with stuff that lasts forever, this is a consumable accessory, that will be obsolete in a year, and will not work after 2-3yrs. It has a FRACTION of the functionality of an iPhone, costing almost the same (not considering contact prices).

    Overall, weakest Apple Hardware release in recent memory!
    Reply
  • piasabird - Friday, July 31, 2015 - link

    Watches went out with the bathwater it seems since smartphones. If you have a phone you dont need a watch. They are dinosaurs. It is taking a step backwards. Reply
  • clouddew - Saturday, August 1, 2015 - link

    The review read like a magazine article with a bit of tech in the middle and the device seems to be a polished piece of unimportant kit for people looking for something to spend their money on.
    It will likely appeal to a few and seem pointless to most others.
    Me? I have a watch, its solar powered & waterproof. Guess which category I'm in? 😉
    Reply
  • OFelix - Saturday, August 1, 2015 - link

    Taptic Engine > finally a good reason to learn Morse code! Reply
  • nosirree - Tuesday, August 4, 2015 - link

    Disclaimer: current android user.

    I like watches, and own mechanical " automatic" ones alongside cheap Timex'es and even one with gps. and being a geek was always interested in smart watches.
    I've played around with this one, and the build is impressive. But it's too first version, as the battery doesn't last enough for a watch, there isn't an always on display. Sony watch v3 does have always on display but it's not very good, while it's battery lasts longer that's not enough either. The pebble does both well but the display isn't good enough, haven't seen the new one.
    So, this is too expensive for what it does in my opinion. Will keep on waiting..
    Reply
  • mystilleef - Friday, August 7, 2015 - link

    Did you guys even review the Moto 360? Reply
  • hukaite - Thursday, June 14, 2018 - link

    Dear,I'm confrimed that that apple watch used the X-axis LRA NOT Z-axis LRA Reply
  • hukaite - Thursday, June 14, 2018 - link

    https://www.vibrationmotors.com Reply

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