Display

The LG G3’s display has been a choice subject to immense controversy. While the LG G3 is the first international phone to ship with a QHD (2560 x 1440) display resolution, those following the industry saw the inevitable trend as Android OEMs made the jump from 720p to 1080p displays at the 4.7-5” display size. While it’s now obvious that going from 720p to 1080p brought a significant increase to perceived resolution, the same dilemma is brought up when debating whether 1080p to 1440p will bring a significant increase to perceived resolution.

Answering this question requires an understanding of both human vision and the tradeoffs that come with increased pixel densities. The short explanation is effectively that while Apple was right to say that 300 PPI or so is the correct pixel density needed to no longer perceive individual pixels at 12 inches away, the issue is more complex than that. There are edge cases such as Vernier acuity that require pixel density up to 1800 pixels per degree (PPD) in one’s field of view. What this means is that once that pixel density is exceeded, it’s possible to make two lines appear to be aligned even if they aren’t. Of course, this is extremely difficult with current technology, although there are displays in existence that do approach the 2000-3000 PPI needed to reach those levels.

There are more edge cases though. While I’m not going to go into deep depth, the eye is effective capable of sampling detail at .8 to 1 arcminute for the most part. This ignores exceptional cases such as Vernier acuity where interpolation in the mind effectively achieves much higher resolution. While this means that 300 PPI at 12 inches is “enough” to match that sampling rate, the Nyquist-Shannon sampling theorem actually means that preventing aliasing requires twice the resolution. In other words, 600 PPI is the realistic upper bound for most displays. This also ignores cases where the display is held much closer for detailed examination. For those interested in learning more about this, I would refer back to our article on display resolution and human vision.

At any rate, this is the first time that we’ve actually used a 1440p display in a smartphone. In practice, it is possible to see more detail on the LG G3’s display, but it’s hard to tell in most cases. Examining the display closely brings out the differences much more, but it’s not quite the jump that going from 720p to 1080p was. Unfortunately, this doesn’t change the cost of increasing pixel density. As I explained in previous articles, increasing pixel density comes with a greater power cost due to the need for a stronger backlight due to lower active area on the display and smaller transistors. It’s clear that LG has had issues with this, with some rather drastic measures taken.

To save power, LG specifically called out three different mechanisms used to save power on the display. LG states that panel self-refresh is still present in the LG G3, but dumping information from SurfaceFlinger reveals that it's a MIPI video panel, not a command panel. This means that either LG has implemented panel self-refresh in another manner, or that it's no longer present.

Issues with panel self-refresh aside, LG specifically calls out dynamic display clocking as one aspect of their system to save battery life. Inspecting the system files shows that the refresh rate for the display is set by a software governor, which has interesting implications for the custom ROM community and the effect that OTA updates can have on battery life. The system files suggest that the dynamic clocking mechanism isn't quite as broad as one might expect, as the only two frequencies that seem to be exposed are 50 and 60 hertz. I suspect that the nature of an LTPS panel means that it's not quite possible to realize a 0 hertz refresh rate for still images, but it may be that this is effectively a replacement for panel self-refresh. I'll save the other that I've found for the battery life section, as it goes beyond normal power-saving measures.

Outside of just power saving measures, I've also noticed artificial sharpening. This effect is obvious enough that you will notice it immediately. As a result, halos are all over the display in certain situations, and in general I hope LG adds an option to turn this off.

I’ll also touch briefly upon some of the things that I’ve found regarding the touch panel. For one, this is a Synaptics solution, the S3528A. This is the same solution found in the One (M8). Unfortunately, there’s no other information that I could find online. Fortunately, digging through the phone reveals other information. It appears that the QuickCover window is actually defined by ranges in x and y coordinates, and I assume that the same is true for the LCD itself, however all of the information is presented in a circular format.

When it comes to how the rest of the display performs, we turn to Spectracal’s CalMAN 5, with a custom workflow to test our displays and quantify performance. To start things off, we’ll take a look at maximum brightness and contrast. We’ll then move onto grayscale accuracy, then saturation accuracy, and finally the Gretag MacBeth ColorChecker test.

Display - Max Brightness

Display - Black Levels

Display - Contrast Ratio

In the maximum brightness department, LG noticeably struggles here. While the G2 had around 410 nits peak luminance, the G3 regresses to around 390 nits maximum. I didn’t find any outdoor brightness boost function in this case either. This means that outdoors, the display will be worse than 1080p devices like the One (M8) and Galaxy S5. The other issue is contrast, which is around 900:1. This isn’t actually as bad as most have made it out to be. The big issue with contrast here is how it degrades with viewing angles. In most angles, a black test image will rapidly wash out towards white when viewing the display at oblique angles.

Display - White Point

Display - Grayscale Accuracy

In grayscale, the LG G3 does quite well. Most OEMs continue to target around 7000k instead of 6500k, and the result is that there’s a lower bound on the average dE2000 scores. I’d still like to see OEMs include a mode that allows selection of a 6500k target, but LG does acceptably well here. As always, it's important to emphasize that the grayscale measurements will produce inaccurate contrast values due to the nature of the i1Pro.

Display - Saturation Accuracy

Saturations are where LG has gone a bridge too far. While some may enjoy “vivid” color, the saturation compression is insane here. In many cases, 80% and 100% saturations are effectively identical. This can be seen on the red and green sweeps. 60% saturation is often closer to the 80% saturation target. LG really, really needs to either stop doing this or give an option to disable it. This is simply just immensely detrimental to the viewing experience, especially in any situation where color accuracy is actually necessary. Editing photos is effectively impossible on this display because the results will look completely different on most other displays that are closer to following sRGB color standards.

Display - GMB Accuracy

In the Gretag MacBeth Colorchecker, the G3 manages to do well, but it’s likely that its grayscale performance is lowering the dE2000 average. Overall, while this isn’t a terrible display, it’s disappointing that LG has decided to go for showroom appeal over great color calibration out of the box. While HTC’s saturation compression algorithms can be disabled with an init.d script, I haven’t found any evidence that the same is true for the LG G3. The low peak brightness is concerning as well, and likely a mitigation for the higher pixel density. 

Introduction & Hardware Battery Life and Charge Time
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  • Mumrik - Sunday, July 6, 2014 - link

    "even if it’s a bit off-putting that LG is trying to make plastic feel like metal. "

    I'm generally not a fan of that either, but surely it's better than Samsung working hard to make plastic feel even cheaper?
    Reply
  • rlab_joo - Sunday, July 6, 2014 - link

    I wouldn't worry about battery life too much. The devs, and rom creators, at xda developers, haven't got to it yet, you can do wonders there. Reply
  • CoryS - Monday, July 7, 2014 - link

    No...people convince themselves they do wonders. In reality custom roms usually hurt battery life, and custom kernels have hosts of other issues. Reply
  • Sunsmasher - Monday, July 7, 2014 - link

    This is by far the most thorough, insightful and intelligent review that I've seen on the LG G3.
    I own the G2, and this review gave me more valuable information than any other review that I've read (and I've read many, many of them). Kudos to Joshua and Anand!
    Reply
  • rocktober13 - Monday, July 7, 2014 - link

    Is it worth the extra $100 or $200 over the G2? I have an upgrade coming up on Verizon. I don't like the M8 with the wasted space from the HTC logo, and my wife has the GS5 so I can't get that ;).

    Also, I heard there is a 2GB and 3GB version; would there be any noticeable difference in performance?
    Reply
  • yvn - Monday, July 7, 2014 - link

    I was so gonna get this phone as I hoped the display would be the best in regards to color accuracy....i am very disappointed now :( Reply
  • djc208 - Tuesday, July 8, 2014 - link

    My biggest problem with my original Optimus G has been LGs speed in updating the software. There are reports that we might get one last bump to 4.4 kitkat, otherwise they they haven't released an upgrade since they went to 4.2, which is sad considering it's essentially the same phone as the Nexus 5, so Google practically does all the work for them.

    Meanwhile the SGS4 is already running 4.4.
    Reply
  • phoenix_rizzen - Friday, July 11, 2014 - link

    Optimus G is the same phone as the Nexus 4, not the Nexus 5 which is based on the LG G2.

    The OG is very easy to root and install custom ROMs onto. There's a vibrant community of devs working on the OG on XDA. My OG died before I could test Android 4.4 on it, but it ran beautifully with RootBox (Android 4.2.2) and Carbon (Android 4.3.1). ParanoidAndroid, SlimBean/SlimKat, and a handful of others are also available.

    I tried to like the LG version of Android, but just could not get over the colour scheme (too bright for me; physically painful to use in the dark, even at low brightness). The only part of the LG ROM I liked was the handwriting recognition in the keyboard. However, the gesture feature of the AOSP keyboard is much nicer to use. :)
    Reply
  • PETER WONG - Tuesday, July 8, 2014 - link

    Finally this morning Google help me to install Candy Crush in G3 Reply
  • Shan83 - Wednesday, July 9, 2014 - link

    Guys, people who are using this phone for quite some time, please do share your thoughts about "overheating" of G3 being mentioned by people.

    Is it abnormally getting heated even upon moderate usage / playing low graphic intense game or continuous Wi-Fi usage?
    Please comment.
    Reply

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