Samsung Galaxy S9+ [SM-G965N] Review: Display
Author:Soomal
Source:eng.soomal.com

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Since the use of the Samsung Exynos processor in mobile phones has been rarely seen in China market, the KT version of the Galaxy S9+ prototype, provided by enthusiastic readers to Soomal, has become an enthusiast or developer's choice. The South Korean KT version of the Galaxy S9+ is equipped with the Exynos 9810 processor, and it will be significantly different from the other Qualcomm version of the Galaxy S9 in core hardware components such as processors and basebands, audio CODECs, and so on. S9's screen color, brightness and other performance amazing, how is the big screen S9+ screen performance?

The S9+ screen is a 6.2-inch, 2960x1440 resolution, and double-curved AMOLED flexible screen panel. Due to the use of a diamond-shaped Pentile pixel array, the actual pixel density is lower than 531ppi. The advantages of OLED panels on mobile platforms are obvious, such as faster response time, fewer smears, and thinner and lighter panels. The S9+ is a full-screen design, with a round edge profile cutting process, with a screen ratio of approximately 84%. The fingerprint identification area on the back is also placed in a more reasonable position than the S8+. At the same time, the Galaxy S9 has brilliant brightness, color, and other performance, which also allows us to have higher expectations for the bigger screen S9+.

Galaxy S9+ running Android 8.1 system, this version of the KT contains Google Play suite, in order to play the screen brightness and color advantages, S9 + support HDR10 video playback and photo brightness control, which is more practical for Netflix membership users. In the system settings, Samsung still offers four preset display modes, namely, adaptive [NTSC], AMOLED Cinema [P3], AMOLED Photo [Adobe RGB] and basic [sRGB] modes. According to convention, the screen objective index test is completed by SpectraCal Calman. If there is no special explanation, the indicators are the test results of the SDR's standard dynamic range display mode.

Display Mode Adaptive AMOLED Cinema AMOLED Photo Basic
Max Brightness 387-681
Grayscale (Gamma 2.2) 2.01 2.06 2.09 2.06
Average Color Temperature K 6754 6142 6100 6176
Average Luminance Error, Delta E 3.93 2.48 2.85 2.58
Comparision Samsung Galaxy S9+ Samsung Galaxy S9 iPhone X Galaxy Note 8 iPhone 8 Plus Galaxy S8+
Brightness cd/m2 387-681 344-659 530-649 406-505 545 399-500
Grayscale (Gamma 2.2) 2.06 2.16 2.22 1.92 2.21 2.29
Average Color Temperature K 6176 6467 6638 6225 6974 6324
Average Luminance Error 2.58 2.32 1.53 3.40 6.42 2.58
Display Mode Adaptive Mode AMOLED Cinema AMOLED Photo Basic [sRGB]
Color Gamut (sRGB) 144.68%
[102% NTSC]
133.13%
[133.13% P3]
114.32%
[81% AdobeRGB]
99.09%
Average Color Error 4.35 3.55 3.87 2.47
Max Color Error 6.96 6.87 7.06 3.25
Comparision Galaxy S9+ Galaxy S9 iPhone X iPhone 8 Plus Galaxy S8+
Color Gamut(sRGB) 99.09% 103.27% 100.5% 102.77% 98.99%
Average Color Error 2.47 1.4 1.15 3.64 3.01
Largest Color Error 3.25 2.9 2.09 8.1 5.05
  • 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.

In terms of objective performance tests, the performance of this Korean version of the S9+ is more general, and the color temperature and gamma are somewhat lower. Especially in various preset modes, the screen color temperature is lower than the standard 6500K. Therefore, the color accuracy and grayscale performance are not as good as the S9 and iPhone X, colors in the sRGB mode is slightly narrower than the standard, and the red performance is relatively normal. There is no obvious visible color dynamic and saturation loss. Due to the low color temperature and gamma, the overall tone of the picture is warm and the contrast is insufficient. The reference of the color of the picture is not as good as that of the S9. However, combined with the performance of the Samsung Galaxy series mobile phone screens over the years, although the system display function is already the most comprehensive in the Android mobile phone camp, the manufacturers are indeed somewhat unstable in the display consistency control.

Although the color and gray-scale performance are general, if the user's color consistency and reference requirements for different devices are more critical, color and gray-scale control are not as perfect as the iPhone X. However, the brightness, color, and viewing angles of the S9+ AMOLED panel are still the top level in current mobile phones. The peak brightness performance is consistent with S9 [close to 1100 nits] and can be stable at 680 nits or more. The readability under the strong light in outdoor is very good. The bent part of the curved screen of S9+ will be darker, and the dispersion of red is obviously more than that of S9, but it is less obvious than that of S8+. The high-performance processor, coupled with its high 75Hz refresh rate and AMOLED response speed, is extremely smooth in terms of movies, games and other entertainment experiences, as well as simple brushing of web pages and social applications. The screen performance of the Galaxy S9/S9+ also reflects Samsung's strong technical level in the OLED panel industry.

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