Cubot P20 Review

24 July 2018, 17:56:44

Cubot P20 Review
You can buy a Cubot P20 at a promotional price from Cubot's official AliExpress store.

Display

Cubot P20 features a 6.18-inch in-cell IPS display and on paper, it looks like the same display but only bigger used on the X18 Plus. The specifications state the same data - 450 nits of typical brightness, 1300:1 static contrast ratio, coverage of 90% of the NTSC colour space reference. 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. 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. 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 % 526.71 cd/m2 0.318 cd/m2 1656 : 1 9898 K
75 % 434.286 cd/m2 0.265 cd/m2 1639 : 1 9795 K
50 % 305.047 cd/m2 0.186 cd/m2 1640 : 1 9629 K
25 % 167.035 cd/m2 0.102 cd/m2 1638 : 1 9535 K
0 % 19.534 cd/m2 0.012 cd/m2 1628 : 1 9523 K
When the white and black luminances are measured on a single frame that shows 50% white and 50% black, we get a maximum brightness of 526.71 cd/m2 and a contrast ratio of 1650:1. The temperature of the white point is high - from 9600 K to 9900 K. Usually, the brightness is not so high when measured this way. Compared to the white luminance values of X18 Plus, the ones of Cubot P20 are significantly higher. The black luminance values are minimally higher, hence the contrast ratio is better compared to the X18 Plus. The temperature of the white point is slightly improved but still remains in the "cold" range.

Two separate black and white frames

Brightness White luminance Black luminance Contrast Color temperature
100 % 524.783 cd/m2 0.327 cd/m2 1605 : 1 9788 K
75 % 428.052 cd/m2 0.270 cd/m2 1585 : 1 10006 K
50 % 300.472 cd/m2 0.191 cd/m2 1573 : 1 9893 K
25 % 164.118 cd/m2 0.104 cd/m2 1578 : 1 9808 K
0 % 19.245 cd/m2 0.012 cd/m2 1604 : 1 9829 K
When we measured the white and black luminance values on a fully white and a fully black display, we got higher white luminance values at all brightness levels. The maximum brightness in this occasion measures 524.783 cd/m2. This sample of the Cubot P20 demonstrates clearly why such a measurement is useful. On the latest IPS displays, the contrast ratio from two separate black and white frames exceeds 3000:1. In this case, it remains almost the same as the one from the single frame measurement. This hints that Cubot has used an older generation IPS panel. The absolute white and black luminance values are very close to the ones from the single frame measurement. The contrast ratio is 1600:1 and the temperature of the white point remains almost unchanged around 9800 K.
Peak brightness (100% APL)
Zopo Speed 8
549.03 cd/m2
Doogee Y7 Plus
545.174 cd/m2
Nokia X7
540.888 cd/m2
Blackview S8
540.239 cd/m2
Doogee S50
540.052 cd/m2
UMIDIGI F1
533.732 cd/m2
nubia Z11
532.558 cd/m2
ZUK Z2
530.364 cd/m2
Oukitel K6
530.036 cd/m2
Oukitel K7
528.9 cd/m2
Cubot P20
526.71 cd/m2
Oukitel K5000
518.452 cd/m2
Xiaomi Redmi S2
516.519 cd/m2
Vernee Mix 2
512.36 cd/m2
UMIDIGI One Max
511.108 cd/m2
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
Cubot specifies that the P20 display covers 90% of the NTSC colour space reference. However, the CIE diagram clearly shows that despite the screen covers a wider-than 100% sRGB colour space, it does not reach 90% of the NTSC one. The display panel has a traditional vertical striped RGB subpixel arrangement.

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