vivo X9 Review: Display
Author:Soomal
Source:eng.soomal.com

Rate:10.00/10

With the newly Qualcomm Snapdragon 625 chipset announced, a series new smartphones is coming. Although Snapdragon 625 is still a octa-core Cortex A53 processor, but the 14nm technology helps it make great progress in frequency, heating, and power-saving. Besides the processor, vivo X9 features 20MP+8MP front camera for selfie bokeh simulation. To help users see them clearly, vivo X9 has a 5.5-inch display screen.

vivo X9 has a 5.5-inch FHD Super AMOLED display screen, while X9 Plus adopts a 5.88-inch FHD IPS display. However, this PenTile layouts has less subpixels, leading this AMOLED display appearing grainy and pixelated in subpixel rendering than normal RGB subpixel layouts display at the same solution. Rather than subpixel layouts, pixel pitch, touch screen, view angles, etc. will also influence display performance. For example, the glass reflecting of Meizu Pro 5 leads to color shift, although it adopts a good AMOLED display panel.

Another problem is color management. Colors displayed on AMOLED are more gorgeous-looking, but not that accurate if no managements been made. However, few Chinese smartphone manufacturers pay attention to color management, only One Plus, an OPPO company, had their display controlled on One Plus 3/3T. Let alone comparing with iPhone. As usual, the quantitative results are tested by SpectralCal Calman.

Comparision vivo X9 OPPO R9s Moto Z Standard ZTE Axon 7 One Plus 3 sRGB Mode vivo Xplay 5s
Brightness cd/m2 371 415 339 338 402 337
Grayscale (Gamma 2.2) 2.1 2.06 2.16 2.15 2.19 2.3
Average Color Temperature K 7417 7603 6854 7318 6262 7533
Average Luminance Error 5.26 6.24 2.74 8.06 3.7 5.23
Comparision vivo X9 OPPO R9s Moto Z Standard ZTE Axon 7 One Plus 3 sRGB Mode vivo Xplay 5s
Color Gamut(sRGB) 144.57% 109.12% 143.7% 101.34% 140.75% 103.60%
Average Color Error 6.9 7 2.38 5.19 3.03 5.45
Largest Color Error 8.86 11.1 4.18 8.82 4.89 7.85
  • Max Screen Brightness (cd/m2 or nits): The maximum brightness one screen could reach, without considering glass quality, algorithm or dynamic adjusting. Over 500 cd/m2 can be used under strong light, below 400 cd/m2 will be to use.
    Gamma 2.2: Gamma value is the key factor in contrast display. Our eyes do not perceive light the way cameras do. Under sRGB, if the gamma value is 2.2, the tonal range is just what human eyes receive. Lower than 2.2, the contrast will go down, otherwise, it will go up. Except the gamma value, we have to see form the picture if the red, green and blue curve overlap, if not, different color contrast will be different. The value between 2.1 to 2.3 is qualified for display, while if the value is below 2 or over 2.4, the contrast will be lower or higher than standard.
    Average Color of White: The average color temperature in degrees, D65 with 6500 K is the standard color of White for most Consumer Content and needed for accurate color reproduction of all images. Higher than 6500K will tend to be cold, otherwise will be warm.
    Color difference: A measurement used to indicate how much a color deviates from standard. The higher the E, the more inaccurate the color. This is because the human eye is only capable of detecting color difference at certain thresholds. It is hard to detect if average E is below 5, less than average 3 E and less than 5 E is excellent, the smaller the E is, the better the color is. Between 5 to 10 E is detectable, over 10E is significantly detectable.
    Color Gamut(sRGB): The specific range of colors that one device is able to display. Our test is based on sRGB. If wide-gamut device is tested, Adobe RGB or NTSC gamut will be noted for reference. Display with over 90% will be enough for everyday use, higher than a certain percentage will not affect using experience significantly. However, photo playback requires precisely range, 10bit video requires wider gamut.
    Restricted by our devices, we will not test the viewing angle. On average, more than 30 would bring over 50% brightness loss.

X9 has a no-surprise testing result. Compared with the AMOLED panels years ago, today's ones have more transparent glasses and higher peak brightness, benefiting user experience when using outdoors in daylight. X9 is slightly better in color and luminance error performance, while R9s is slightly brighter. X9 also provides Night Shift Mode for using in low light scenes. If this mode is switched on, the color temperature will go down to lower than 5400K.

Chinese smartphone manufacturers are paying attention to cost controlling on display. It is said that vivo, OPPO and Huawei are about to tie up to form a consortium with China based AMOLED display maker. Also, we saw some smartphones with Chinese AMOLED display released last year. Although those smartphone manufacturers are controlling their costs, there also made a contribution in completing the smartphone industry chain, reducing dependence on imports, and bridging the gap in technology.

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