Razer Phone Review: Display
Author:Soomal
Source:eng.soomal.com

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Razer is a rookie in the mobile phone market, but Razer Phone, their first mobile phone product, is trying to maintain its emphasis on gaming and e-sports brand style in design, system and application functions. Razer Phone is priced at 699 US dollars, equipped with Snapdragon 835 processor and 8GB of memory and 4000mAh [about 14800 mWh] of large-capacity battery, supports 25W fast charging, in order to ensure the stability of the CPU, but also used a pure copper heat pipe Heat dissipation. Determine the game experience In addition to the processor and graphics performance of the phone, the touch delay, color, and brightness of the screen are equally important.

The Razer Phone uses a 5.7-inch, 2560x1440 resolution IPS panel with a pixel density of 515PPI. The Dolby Atom stereo speakers on the top and bottom of the screen are on the front, and the fingerprint sensor is on the side of the power button. This may cause the user to worry the problem of dust entering in haze using, and the loud speaker needs a hot air gun to dismantle , making it is troublesome to maintain.

According to the information of Razer official website, the display panel adopts Sharp IGZO [indium gallium zinc oxide] technology. The IGZO process can improve the power consumption of the screen and the TFT liquid crystal drive efficiency. Razer Phone screen biggest spot is the first to support 60/90/120Hz display refresh rate switching and vertical synchronization support for Android phones, which manufacturer call it UltraMotion technology. The screen refresh rate is much higher than the traditional mobile phones 60-75Hz. Higher refresh rate can bring smoother animation and lower touch input and display delay. It is a very useful function for game and movie lovers. The benefits of high refresh rate can be found in What is Refresh Rate. The Razer Phone also supports HDR10, which is useful for online video websites subscribers, such as Netflix.

Razer Phone is running Android 7.1 system, in the system display settings, the manufacturer provides three refresh rate switching, which is 60, 90 and 120Hz, also provides Night mode for 2500K-5500K display color temperature. Razer Phone can also adjust the system output resolution, which can be reduced to 1080p or 720p. This feature is also very common in high-end mobile phones such as Sony and Samsung. Reducing output resolution can relieve the smartphones pressure without obvious image perception, as the graphic calculation burden contributes to battery life. According to the convention, the screen objective index test is completed by SpectraCal Calman. If there is no special explanation, the screen indicators are all the test scores in the standard dynamic range display mode of SDR. Since Razer Phone does not have the standard color gamut and color temperature switching function. We will only test default state.

Comparision Razer Phone Samsung Galaxy S9 iPhone X Galaxy Note 8 iPhone 8 Plus
Brightness cd/m2 387 344-659 530-649 406-505 545
Grayscale (Gamma 2.2) 2.37 2.16 2.22 1.92 2.21
Average Color Temperature K 7397 6467 6638 6225 6974
Average Luminance Error 5.8 2.32 1.53 3.40 6.42
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Comparision Razer Phone Galaxy S9 iPhone XiPhone 8 Plus
Color Gamut(sRGB) 106.57% 103.27% 100.5% 102.77%
Average Color Error 4.07 1.4 1.15 3.64
Largest Color Error 8.36 2.9 2.09 8.1
  • 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.

Since the standard color temperature of the screen approaches 7400K, which is higher than the 6500K standard, the gray scale and color accuracy of the Razer Phone are not unexpected, just so so. In addition, due to the high gamma value of the screen, the color contrast of the screen is relatively higher than iPhone, Samsung Galaxy S9 and other models, making it looks harder. The color of the screen is slightly higher than the sRGB level, and the warm red and orange colors are brighter at the same brightness than the basic display mode of the S9, but there is no noticeable discomfortableness. This kind of color-rendered screen will have a brighter contrast in the images of the game and the movie, but it lacks reference in the comparison of photos and colors. The obvious short board of the Razer Phone screen is the brightness, and the less-than-400 peak brightness results in poor readability in outdoor sunlight.

Due to the high refresh rate advantage brought by UltraMotion technology, the Razer Phone's touch operation is definitely smoother than most mobile phone screens at the default 90Hz refresh rate, but it is not as obvious as the advantages of the high-priced AMOLED screen phones such as the iPhone X and S8. And on a small-sized mobile phone screen, some users are not sensitive to the difference in the refresh rate. In the 120Hz mode with the fastest refresh rate, the response speed of the LCD screen may not keep up with the operation of the fingers. Therefore, we recommend you to use it at 90Hz. This is enough for most gaming and movie entertainment applications. Another problem is that in the current mainstream mobile 3D game applications, most are only up to 30 FPS. How does a higher refresh rate work? The Razer Phone provides a dedicated game control application that can control the CPU frequency of each game running independently in display frame rate, resolution and full-screen anti-aliasing control, can unlock some game frames to 60 or 90 FPS run [somewhat similar to the graphics control panel on the PC platform]. Overall, the advantages and disadvantages of the Razer Phone's screen are very clear. Large-capacity batteries and performance control functions are indeed more suitable for games and video entertainment applications, but the low screen brightness will also cause trouble in other applications.

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