We recently saw the release of two new smartphones with dramatically improved screen-to-body ratios, the LG G6 and Samsung Galaxy S8. Before either of these phones were announced, however, Xiaomi’s Mi MIX gave us a glimpse of the future. A pseudo-concept phone that’s being produced in limited quantities and sold in China, it combines the latest technology with innovative design, resulting in a forward-looking phone with virtually no bezels on three sides of the screen and an amazing 91.3% screen-to-body ratio, according to Xiaomi (or roughly 84% using the chassis dimensions).

Xiaomi created the Mi MIX to show off its design prowess and demonstrate its ability to produce innovative products. Xiaomi has employed new materials (ceramic) and design elements (rounded edges on the back) in the past, but by creating something as unique as the MIX, it hopes to prove that its products are as lust worthy as those that come from Apple and Samsung.

Competition among Chinese OEMs is fierce, with most of them sacrificing smartphone profit for market share. Xiaomi in particular has a reputation for creating nice-looking phones packed with high-performing hardware that are sold at lower-than-expected prices, compensating for the near-zero profit from hardware sales with recurring revenue earned through its software ecosystem. This strategy has helped fuel its rapid growth, but as the smartphone market in Asia nears saturation, it may be time to shift its focus. Xiaomi has been aggressively diversifying its product portfolio, branching out into smart home devices, UAVs, bicycles, etc., and pushing into western markets where premium phones fetch higher profit. By creating a flashy product like the MIX, Xiaomi attracts attention and improves its brand cachet, which can help it break into new markets and establish itself as a premium player that can charge more for its phones.

Encased within the shiny ceramic is a Snapdragon 821 SoC and a large 4400 mAh battery. There’s also either 4GB of RAM and 128GB of internal storage for the standard MIX or 6GB of RAM and 256GB of storage for the Mi MIX 18K. Both configurations offer flagship-class performance.

In the short time I’ve used the MIX, the only component I’ve had issues with is the fingerprint sensor. It seems less tolerant of moisture than other sensors and returns a higher rate of false negatives. It’s certainly usable, but I often found it required two or three tries to unlock the phone.

  Xiaomi Mi MIX
SoC Qualcomm Snapdragon 821
(MSM8996 Pro)

2x Kryo @ 2.35GHz
2x Kryo @ 2.19GHz
Adreno 530 @ 653MHz
Display 6.4-inch 2040x1080 IPS LCD
Dimensions 158.8 x 81.9 x 7.9 mm
209 grams
RAM 4GB / 6GB LPDDR4
NAND 128GB / 256GB (UFS 2.0)
Battery 4400 mAh (16.94 Wh)
non-replaceable
Qualcomm Quick Charge 3.0
Front Camera 5MP, 1/5" OmniVision OV5675 PureCel, 1.12µm pixels, f/2.2
Rear Camera 16MP, 1/3.06" OmniVision OV16880 PureCel Plus-S, 1.0µm pixels, f/2.0, PDAF, Auto HDR, dual-tone LED flash
Modem Qualcomm X12 LTE (Integrated)
2G / 3G / 4G LTE (Category 13/12)
SIM Size 2x NanoSIM (dual standby)
Network China
FDD-LTE B1 / B2 / B3 / B4 / B5 / B7 / B8
TDD-LTE B38 / B39 / B40 / B41
GSM 850 / 900 / 1800 / 1900
WCDMA B1 / B2 / B5 / B8
CDMA BC0
TD-CDMA B34 / B39
Wireless 802.11a/b/g/n/ac 2x2 MU-MIMO, BT 4.2, NFC, GPS/GNSS/Beidou
Connectivity USB Type-C, 3.5mm headset
Launch OS Android 6.0 with MIUI 8
Launch Price 4GB/128GB: ¥3499
6GB/256GB: ¥3999

The MIX’s 6.4-inch IPS LCD display has a 17:9 aspect ratio, which Xiaomi divides into a traditional 16:9 viewable area with a dedicated space at the bottom of the screen for the onscreen controls. Not only does this eliminate the need for capacitive buttons in the lower bezel—keeping it as slim as possible—but it avoids UI scaling issues for apps targeting 16:9 screens.

Our review unit uses a Sharp fte716 IPS LCD panel that appears to use IGZO (indium gallium zinc oxide) thin-film transistors (TFTs) in the backplane. IGZO transistors have several advantages over the amorphous silicon (aSi) or low-temperature polysilicon (LTPS) varieties. 

Every liquid crystal (LC) requires circuitry, including a transistor and a capacitor, to control its operation. These components can block some of the light transmission from the backlight, however, reducing the display’s power efficiency. The more light that passes through the backplane, the less power the backlight needs to consume to reach a given brightness.

Most IPS LCD panels use aSi TFTs. These are not naturally transparent, although, they can be made thin enough to allow at least some light to pass through them. IGZO TFTs, however, are fully transparent, which improves power efficiency by allowing more light to pass through.

IGZO’s electron mobility is also significantly higher than aSi and almost as good as LTPS, which allows smaller transistors to carry the same current. The MIX’s panel uses the smaller TFTs to increase the aperture ratio (the ratio of a pixel’s transparent and opaque areas), which further improves efficiency by allowing more light to pass through.

Most LCD displays need to continually refresh the screen, even when displaying a static image, because high leakage current in aSi and LTPS TFTs causes the capacitors in the pixels to discharge. Continuously driving the pixels in this manner increases power consumption, not just within the panel itself, but also by forcing the SoC to continuously push the contents of the frame buffer over the memory bus. To help mitigate this issue, some panels support panel self-refresh (PSR), which embeds a small amount of RAM in the panel itself to hold a local copy of the frame buffer. When displaying a static image (which is most of the time when not playing a game or watching a video), the panel can use its local copy to refresh the screen, reducing the power the SoC and busses would normally consume.

The Mi MIX’s panel does not support panel self-refresh, which would normally be a serious omission for a flagship phone; however, IGZO TFTs have significantly less leakage current than aSi and LTPS, allowing their pixels to discharge more slowly and retain their image state longer. A technology called idling-stop driving (IDS) takes advantage of this by significantly reducing the refresh rate of the screen when displaying static content, essentially achieving a similar power advantage as a display with PSR.

IGZO’s benefits not only reduce a display’s power consumption, but they are directly responsible for the Mi MIX’s most eye-catching feature: its edge-to-edge display. IGZO allowed Sharp to integrate the supporting circuitry that normally surrounds the active area of the screen into the panel itself, allowing Xiaomi to nearly eliminate the bezel on three sides.

The Mi MIX is a stunning looking phone whose nearly edge-to-edge display and shiny ceramic body make it stand out as something special. Xiaomi’s use of ultrasonic and piezoelectric technology streamlines the front by hiding two components—proximity sensor and earpiece speaker—behind the screen, fueling the illusion that you’re holding nothing but a 6.4-inch display. As the phone’s centerpiece, display performance is critical for the Mi MIX, and our analysis on the next page shows that it looks as good as the rest of the phone.

Display Performance
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  • thetuna - Monday, April 10, 2017 - link

    Just turn the phone when you take a picture ¯\_(ツ)_/¯ Reply
  • zeeBomb - Monday, April 10, 2017 - link

    Xiaomi doing big things... I wish they were some Here in the US. Reply
  • zodiacfml - Monday, April 10, 2017 - link

    That was a short analysis and doesn't have analysis comparing this to the G6 and S8. I've held an S8 and G6 at a local grocery store and was disappointed with both. The tall aspect ratio of the S8 has little value in terms of screen real estate and the screen area feels cramped. It could have work in landscape orientation. The G6 isn't that bad but the LCD screen is washed out compared to the S8's AMOLED screen and it costs almost an S8. The Xiaomi Mi Mix beats these latest, unavailable devices easily. Unfortunately, I am leaning towards AMOLED screens as they are just superior in every aspect except to an all white UI or content.

    I am looking forward for the refurbished Note 7's which has a display performance and spec similar to the S8.
    Reply
  • UtilityMax - Tuesday, April 18, 2017 - link

    Anandtech has gone downhill. They stopped reviewing smartphones and tablets after the Pixel. Reply
  • dstarr3 - Monday, April 10, 2017 - link

    No removable battery, no sale. Reply
  • unrulycow - Monday, April 10, 2017 - link

    If this came with stock Android, I'd be in. Reply
  • Harlan - Monday, April 10, 2017 - link

    Just thought I'd add my two cents:
    I got this phone 3-26 and I really like it
    Like most people say, yea it lasts forever
    On my Galaxy s6 active I'd be lucky to get 3.5 hours of screen-on-time
    With this the minimum is 5 hours, I think the most I got was a little less than 6.5 hours
    The display is sharp, but you can tell it's not as sharp as a 1440p phone
    I just flashed a near-stock ROM on 7.1 and it's soooo nice.
    MIUI is ok after hours of fiddling, but I still didn't get it to 100% English
    I'm using the included case and I'm still horrified of dropping it, but all in all its a great phone
    Reply
  • jospoortvliet - Monday, April 10, 2017 - link

    I'm wondering when I look at it - wouldn't putting the bezel on TOP instead of bottom be nicer? Camera on top, microphone, sensors... The bottom bezel is useless anyway ;-)

    But maybe it would look less 'wow'.
    Reply
  • RaistlinZ - Monday, April 10, 2017 - link

    It's 2017. Why can't we get properly calibrated screens by default? I don't get it. Reply
  • opc - Monday, April 10, 2017 - link

    I'm a bit disappointed to see the 91.3% screen to body ratio mindlessly re-published here just like it was on every other major site when they first introduced this phone. It goes to show how a simple misleading marketing slide can fool millions of people into believing something that is measurably incorrect.

    The only way to get to 91.3% is to ignore the lower bezel entirely, and that's not how you calculate the screen to body ratio of a phone. The actual screen to body ratio is just shy of 84%, or about exactly the same as the Samsung S8+. Don't get me wrong... it's still an impressive feat, but the fact that they marketed it the way they did (and that every major news outlet regurgitated the same info without even doing a cursory check) is pretty shameful.

    Please correct this in the article, and take the time to verify the information written on marketing slides before repeating it as fact in the article.
    Reply

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