Cubot X18 Plus Review

5 April 2018, 11:36:18

Cubot X18 Plus Review
You can buy a Cubot X18 Plus at a promotional price here.

Display

Cubot X18 Plus has a bigger display with a higher resolution compared to the X18. The model employs a 5.99-inch in-cell IPS unit with an FHD+ resolution. The screen has a peak brightness of 450 cd/m2, 1300:1 static contrast ratio and covers 90% of the NTSC colour space. In-cell means that the touch sensor layer is implemented inside the cell of the liquid-crystal display (LCD) thus making the unit thinner, more responsive, less power consuming and brighter. In a similar fashion to the display of Doogee S50, we have noticed 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. That's why we have decided to make two measurements, in order to give a more realistic picture of the static contrast, white and black luminance. The Single Frame measurements show the white and black luminance from a screen that shows 50% white and 50% black. The Separate Frames measurements show the white and black luminance 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 % 381.388 cd/m2 0.263 cd/m2 1450 : 1 9793 K
75 % 310.106 cd/m2 0.221 cd/m2 1403 : 1 9873 K
50 % 218.153 cd/m2 0.152 cd/m2 1435 : 1 9833 K
25 % 118.409 cd/m2 0.082 cd/m2 1444 : 1 9937 K
0 % 15.729 cd/m2 0.011 cd/m2 1430 : 1 >10040 K
When the white and black luminance are measured on a single frame that shows 50% white and 50% black, we get a maximum brightness of 381 cd/m2 and a contrast ratio of 1400:1. The temperature of the white point is high - from 9800 K to 10000 K.

Two separate black and white frames

Brightness White luminance Black luminance Contrast Color temperature
100 % 488.809 cd/m2 0.140 cd/m2 3491 : 1 9798 K
75 % 403.161 cd/m2 0.114 cd/m2 3537 : 1 9908 K
50 % 282.440 cd/m2 0.078 cd/m2 3621 : 1 9890 K
25 % 155.515 cd/m2 0.043 cd/m2 3617 : 1 9913 K
0 % 20.809 cd/m2 0.006 cd/m2 3468 : 1 10109 K
When we measured the white and black luminance on a fully white and a fully black display, we got higher white luminance at all brightness levels. The maximum brightness in this occasion measures 489 cd/m2. At the same time, the black luminance values are lower, hence the contrast ratio is very high - from 3500:1 to 3600:1. This makes the displayed content clearly visible under direct sunlight. The temperature of the white point remains unchanged within the 9800-10000 K range.
Peak brightness (100% APL)
Doogee S70
509.314 cd/m2
Xiaomi Mi Max 2
508.652 cd/m2
Cubot Power
508.083 cd/m2
Xiaomi Mi MIX
507.669 cd/m2
Xiaomi Redmi Note 7
506.006 cd/m2
Oukitel K3
502.322 cd/m2
Oukitel K10000
501.5 cd/m2
LeEco Le Pro 3 Elite
500.034 cd/m2
Oukitel WP5000
496.99 cd/m2
Xiaomi Mi Max SD650
492.415 cd/m2
Cubot X18 Plus
488.809 cd/m2
Ulefone Power 3
488.657 cd/m2
UMIDIGI Z2 Pro
488.288 cd/m2
Bluboo S8
487.373 cd/m2
Vernee X
486.998 cd/m2
LeEco Le X920
486.637 cd/m2
LeEco Le Max2
486.63 cd/m2
Xiaomi Mi MIX 2
484.569 cd/m2
Blackview BV8000 Pro
483.791 cd/m2
nubia Z17 mini Standard Edition
483.468 cd/m2
Oukitel U20 Plus
480.176 cd/m2
The CIE diagram unveils a higher than 100% coverage of the sRGB colour space but it is far from 90% NTSC. The display panel has a traditional vertical striped RGB subpixel arrangement.

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