Oukitel K8 Review

24 August 2018, 17:39:21

Oukitel K8 Review
You can buy a Oukitel K8 at a promotional price from Banggood or from Oukitel's official store on AliExpress. More information can be found on Oukitel's website

Display

Oukitel K8 features a 6-inch in-cell IPS screen made by AU Optronics (AUO). The unit has an FHD+ resolution (1080 x 2160 pixels) and covers 76.25% of the whole front surface of the handset, which is protected by an Asahi Dragontrail glass. 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. Recently, we have noticed in some models 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. 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 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 % 306.663 cd/m2 0.233 cd/m2 1316 : 1 9236 K
75 % 291.215 cd/m2 0.221 cd/m2 1318 : 1 9335 K
50 % 202.586 cd/m2 0.154 cd/m2 1315 : 1 9352 K
25 % 109.156 cd/m2 0.080 cd/m2 1364 : 1 9437 K
0 % 12.297 cd/m2 0.009 cd/m2 1366 : 1 >9595 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 306.663 cd/m2 and a contrast ratio of 1300:1. The temperature of the white point is around 9200-9500 K. This maximum brightness is not very high in general and in practice, content is not clearly visible outdoors in bright sunlight. The contrast ratio is typical for a device of that class, so is the temperature of the white point. Oukitel has specifically mentioned that it's a "warm-tone" display. However, a colour temperature that exceeds 9000 K is far from being "warm". Still, it is better than other Oukitel models that achieve temperatures of the white point that exceed 11000-12000 K. Actually, from the Quick Settings you can switch on/off a Reading Mode toggle, in case you need it.

Two separate black and white frames

Brightness White luminance Black luminance Contrast Color temperature
100 % 401.167 cd/m2 0.128 cd/m2 3134 : 1 9093 K
75 % 380.805 cd/m2 0.121 cd/m2 3147 : 1 9187 K
50 % 267.243 cd/m2 0.083 cd/m2 3220 : 1 9205 K
25 % 145.672 cd/m2 0.044 cd/m2 3311 : 1 9278 K
0 % 17.061 cd/m2 0.005 cd/m2 3412 : 1 9503 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 401.167 cd/m2. At the same time, the black luminance values are lower than the ones measured on a single frame (compare with the first table), hence the contrast ratio is very high - 3400:1. Practice shows that the more realistic contrast level is 1300:1 received from the single frame measurement. The temperature of the white point remains unchanged within the 9200 K range.
Peak brightness (100% APL)
Meizu m3 note
426.377 cd/m2
OnePlus 3T
425.272 cd/m2
Xiaomi Redmi Note 4X
424.655 cd/m2
Ulefone Armor 3
422.84 cd/m2
Ulefone Vienna
420.3 cd/m2
Oukitel K10000 Pro
418.812 cd/m2
UMIDIGI Z1 Pro
418.503 cd/m2
Oukitel U15S
415.441 cd/m2
Nokia X5
412.093 cd/m2
Oukitel WP2
406.155 cd/m2
Oukitel K8
401.167 cd/m2
Blackview BV7000 Pro
393.042 cd/m2
Elephone P8 (2017)
390 cd/m2
UMi Touch
386.54 cd/m2
Vernee Apollo
382.946 cd/m2
Xiaomi Redmi Note 4 16GB
381.816 cd/m2
Elephone U
381.74 cd/m2
Samsung Galaxy S9 Exynos
379.31 cd/m2
Samsung Galaxy S9+ Exynos
378.355 cd/m2
Cubot King Kong 3
377.162 cd/m2
THL T7
369.9 cd/m2
The CIE diagram unveils a colour space coverage that's only slightly higher than 100% sRGB and is near 80% NTSC. The display panel has a traditional vertical striped RGB subpixel arrangement.

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