Xiaomi Launches the Mi 4

Today, Xiaomi announces the next version of their flagship smartphone, the Mi 4. Much like the OnePlus One, this device is effectively a high end device at a mid-range price. For the most part, this device is very much like the OnePlus One, although there are some crucial differences. The display is smaller, at 5 inches diagonal it makes for a device that is easier to use with one hand. The front facing camera is eight megapixels rather than five, and both cameras have a wider f/1.8 aperture. As always, a full list of specs can be seen below.

While some details are lacking (namely, dimensions) it’s generally clear that this phone is designed to try and be the best phone of the Snapdragon 801 generation. The use of even wider apertures will help with light collection but there is potential for increased aberration as a result, which would be important to evaluate. The display is also said to be 84% NTSC, which would correspond to about 128% of the sRGB colorspace, so it’ll be important to see whether or not there’s an accurate sRGB calibration in this device.

This time around, Xiaomi seems to be trying to improve the in hand feel of their devices, by using a stainless steel band around the phone for improved feel. The back cover is still plastic, but Xiaomi is introducing swappable back covers with different materials and colors to try and alleviate the issue. This definitely seems to be a move inspired by the StyleSwap covers that OnePlus is releasing for the One. The covers can be seen below.

Keeping with tradition, the Mi 4 will be priced extremely competitively. The 16GB version will sell for the equivalent price of 320 USD, and the 64GB variant for 400 USD. There’s no word on availability for other coutnries, but the phone will be available for pre-order in China on July 29th.

Gallery: Xiaomi Mi 4

Evaluating Samsung’s QHD AMOLED Displays

Recently, a package showed up at my door. While this is normally not worth talking about, the Galaxy S5 Broadband LTE-A happened to be in the box. For those unfamiliar with this phone, it’s basically a refresh of the Galaxy S5. This means a Snadragon 805 SoC instead of Snapdragon 801. This also means a minor new revision of Krait (450 vs 400), a new GPU, and a separate MDM9x35 modem on a new process (20nm SoC vs 28nm HPm). This variant also ships with more RAM (3GB vs 2GB) and more internal storage (32GB vs 16GB). The display is also higher resolution (2560×1440 vs 1920×1080).

In terms of the resolution itself, the GS5 Broadband LTE-A doesn’t seem to hold a significant advantage over the original Galaxy S5. While it’s still possible to see the difference, once again I don’t find it to be significant. It may be of value to others, but I think the PPI race needs to stop here, as I find it hard to justify the relatively minor resolution increase over the potential battery life gains and opportunity cost of pursuing higher pixel density over other display characteristics. Going to 4K would make even less sense at this display size, although there may be value to 4K in a tablet display. In the case of this display, I only see around a 10 nit reduction in brightness as the maximum luminance in auto brightness is around 430 nits, while on the older Galaxy S5 it was 440 nits. When set manually, the display has a peak luminance of 368 nits, a minor improvement over the previous model.

Of course, resolution isn’t everything. Testing color accuracy is also important, which is the real surprise here. As always, these tests are run using an i1Pro for all measurements but contrast, and done using a custom workflow in SpectraCal’s CalMAN 5. All color/grayscale measurements have been done in cinema mode as it is closest to targeting sRGB.

Based on grayscale alone, Samsung sets a new record for color accuracy in this department. It’s definitely a healthy leap forward from the original Galaxy S5. In subjective viewing there are still some minor issues with excessive green in the color balance, but it’s much better than before. The contrast is still just as dark as before. In a completely dark room, I can’t tell whether the screen has turned off when displaying an all-black image.

In saturations, Samsung has done an incredible job of calibrating the display. Just looking at the graph of dE2000 averages, there is clear improvement from generation to generation. Samsung is now tied with Apple for color accuracy in this department.

While the saturation test is important, it’s often not as rigorous at the GMB ColorChecker test. It’s fully possible for a display to do well in the saturation test but fall flat in this one. Fortunately, this isn’t the case here. Samsung has managed to approach the iPhone 5c in calibration accuracy here, easily setting a record amongst Android OEMs. The difference in color is definitely noticeable when compared to a Galaxy S5, and I hope that every Android OEM follows Samsung’s lead in this department.

Based upon this initial evaluation of Samsung’s first quad HD AMOLED display, things are looking good. There is a small drop in the maximum luminance but nothing significant. The next critical piece of the puzzle is whether power draw is significantly worse on the Galaxy S5 Broadband LTE-A, although those results and the full review aren’t quite ready yet. While only one aspect, things are currently looking up for the GS5 Broadband LTE-A, even if the name is a bit long. This may also represent a change in the future of mobile displays, as AMOLED increasingly seems poised to supplant LCD technologies. Unfortunately, as Samsung seems to be the sole supplier of such displays other OEMs are unlikely to adopt AMOLED until other vendors catch up with equivalent technology.

The LG G3 Review

While the enthusiast segment is no stranger to LG smartphones, for the most part LG hasn’t received nearly the amount of attention that Samsung has. At first, it doesn’t make much sense. After all, LG is almost as big as Samsung. Both ar…