Xiaomi Mi A2 Review

16 August 2018, 05:28:46

Xiaomi Mi A2 Review
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Display

Xiaomi Mi A2 is equipped with a 5.99-inch IPS display with an 18:9 aspect ratio, FHD+ resolution (1080 x 2160 pixels) and a 403 ppi pixel density. The manufacturer states a static contrast ratio of 1500:1. The display covers 77.63% of the total front surface of the handset and is protected by a Corning Gorilla Glass 5 with a 2.5D curve. Ever since March this year, we have noticed on our review units with IPS displays that when we switch from one colour to a fully black screen, the handset needs about 10 seconds to show the black it is capable of showing. During these 10 seconds, the screen gets darker and darker. Hence, since then we've been making two measurements of the displays in order to give a more realistic picture of the static contrast, white and black luminance values. The Single Frame measurements show the white and black luminance values from a screen that shows 50% white and 50% black. The Separate Frames measurements show the white and black luminance values received from a fully white and fully black screen.

A single frame, 50% white / 50% black

Brightness White luminance Black luminance Contrast Color temperature
100 % 446.726 cd/m2 0.291 cd/m2 1535 : 1 8178 K
75 % 344.473 cd/m2 0.226 cd/m2 1524 : 1 8225 K
50 % 238.954 cd/m2 0.158 cd/m2 1512 : 1 8232 K
25 % 130.724 cd/m2 0.085 cd/m2 1538 : 1 8309 K
0 % 17.413 cd/m2 0.011 cd/m2 1583 8420 K
Only a single glance at the results on both tables is enough to unveil the classic "new-generation" IPS display. The upper table shows the single-frame measurements. When the white and black luminance values are measured on a single frame that shows 50% white and 50% black, we get a maximum brightness of 447 cd/m2 and a contrast ratio of 1500:1 that's very stable at all brightness levels. It is worth mentioning that this ratio is specified by the manufacturer. The temperature of the white point is from 8200 K to 8400 K - increases with the decrease in brightness level.

Two separate black and white frames

Brightness White luminance Black luminance Contrast Color temperature
100 % 455.873 cd/m2 0.180 cd/m2 2533 : 1 8100 K
75 % 350.817 cd/m2 0.139 cd/m2 2524 : 1 8141 K
50 % 242.935 cd/m2 0.096 cd/m2 2531 : 1 8150 K
25 % 133.076 cd/m2 0.052 cd/m2 2559 : 1 8200 K
0 % 17.752 cd/m2 0.007 cd/m2 2536 8302 K
When the white and black luminance values on a fully white and a fully black display (two separate frames) are measured, we get slightly higher white luminance values at all brightness levels. The maximum brightness in this occasion measures 456 cd/m2. However, the black luminance values are significantly lower when compared to the ones from the single-frame measurement. Hence, the static contrast ratio levels jump to 2500:1, which is quite stable at all brightness levels. The temperature of the white point is slightly decreased and is in the 8100-8300 K range. It is inversely proportional to the brightness level.
Peak brightness (100% APL)
Oukitel Mix 2
475.643 cd/m2
Xiaomi Mi 5X
475.387 cd/m2
Xiaomi Mi MIX 2S
475.333 cd/m2
Cubot X18
473.211 cd/m2
Ulefone X
470.168 cd/m2
iNew U9 Plus
468.017 cd/m2
Huawei Honor Play
467.545 cd/m2
Oukitel U16 Max
465.628 cd/m2
UMi Max
465.6 cd/m2
UMi Plus
456.307 cd/m2
Xiaomi Mi A2
455.873 cd/m2
Xiaomi Redmi Note 3 Pro 16GB
455.851 cd/m2
Ulefone Gemini
451.148 cd/m2
Oukitel U13
448.953 cd/m2
Oukitel U18
448.366 cd/m2
Ulefone Power 5S
448.14 cd/m2
Doogee BL12000 Pro
447.765 cd/m2
Ulefone Armor 6
447.346 cd/m2
Leagoo Shark 1
445.4 cd/m2
Vernee Apollo Lite
445.205 cd/m2
Cubot Dinosaur
443.735 cd/m2
The CIE diagram clearly shows a colour space coverage that's slightly wider than 100% of the SRGB one and could correspond to 85% of the NTSC colour space reference. The display panel has a traditional vertical striped RGB subpixel arrangement.

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