Ulefone X Review

27 July 2018, 16:57:45

Ulefone X Review
You can buy an Ulefone X at a promotional price from Ulefone's official store on AliExpress or from Banggood.

Display

Ulefone X is built around a 5.85-inch LCD display with a resolution of 720 x 1512 pixels or the so-called HD+ resolution. The manufacturer did not specify the exact panel type or any further characteristics. The 2.5D cover glass is of unknown type either. 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 % 443.027 cd/m2 0.542 cd/m2 817 : 1 9043 K
75 % 438.086 cd/m2 0.536 cd/m2 817 : 1 9244 K
50 % 355.484 cd/m2 0.437 cd/m2 813 : 1 9156 K
25 % 195.373 cd/m2 0.240 cd/m2 824 : 1 9096 K
0 % 24.473 cd/m2 0.030 cd/m2 816 : 1 9200 K
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 443 cd/m2 and a contrast ratio of 820:1. The temperature of the white point is around 9200 K. As you'll see below, the white and black luminance values are only slightly lower than the ones received from measuring two separate black and white frames. There's no a big difference in the static contrast ratio, hence, we can conclude that the display in use is of an older generation.

Two separate black and white frames

Brightness White luminance Black luminance Contrast Color temperature
100 % 470.168 cd/m2 0.509 cd/m2 924 : 1 8986 K
75 % 466.853 cd/m2 0.502 cd/m2 930 : 1 9270 K
50 % 378.621 cd/m2 0.419 cd/m2 904 : 1 9237 K
25 % 207.375 cd/m2 0.227 cd/m2 914 : 1 9199 K
0 % 25.902 cd/m2 0.029 cd/m2 893 : 1 9404 K
When we measured the white and black luminance values on a fully white and a fully black display, we got slightly higher white luminance values and slightly lower black luminance values at all brightness levels. The maximum brightness in this occasion measures 470 cd/m2. The contrast ratio remains very close to the one achieved via measuring the black and white luminance values on a single frame - 920:1. The temperature of the white point (colour temperature) is maintained around 9300 K. The measurements unveil that either way you get a poor static contrast. We know that such measurements are relative in terms of real-life performance but in this case, the display offers a not-so-good outdoor visibility.
Peak brightness (100% APL)
nubia Z17 mini Standard Edition
483.468 cd/m2
Oukitel U20 Plus
480.176 cd/m2
UMIDIGI Z Pro
478.662 cd/m2
Xiaomi Mi 8 Lite
477.308 cd/m2
Huawei Honor V10
476.87 cd/m2
Oukitel U23
476.392 cd/m2
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
The CIE diagram clearly shows a lower-than-100% sRGB colour space coverage. The display panel has a traditional vertical striped RGB subpixel arrangement.

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