At first glance, the screen of iPhone 7 is not very different from that of iPhone 6 in 2014 and iPhone 6s in 2015. But as we look at this screen in depth, we find that it has actually been greatly improved compared with that of iPhone 6.
Where is it reflected?
The iPhone 7 has two standard color gamut, one is the DCI-P3 wide color gamut, which is mostly used in 4K UHD TV and cinemas, and the other is the traditional sRGB/Rec.709 (slightly narrower color gamut). Most consumer products, such as cameras, ordinary televisions, computers, as well as photos, videos, movies, etc., use this standard, The color accuracy of the two modes on the iPhone 7 is perfect. In addition, only three manufacturers currently use the DCI-P3 wide color gamut standard on their mobile phones and tablets, which is an obvious advantage for Apple. Other manufacturers need to catch up quickly.
In the automatic brightness mode of iPhone 7, the maximum measured brightness is 705 nits in the dazzling light environment.
The contrast measured by iPhone 7 has reached a new high in the IPS LCD display category.
The screen reflectivity ratio of iPhone 7 is almost the lowest among all mobile phones.
In view of the excellent performance of the LCD screen of iPhone 7, I believe many people will think that Apple will not use OLED displays on future iPhones.
4K UHD TV also adopts this DCI-P3 wide color gamut standard
The new iPhone 7 supports two standard color gamuts, the DCI-P3 wide color gamut and sRGB/Rec.709. Most smartphones and tablets only support sRGB/Rec.709, while the DCI-P3 color gamut is 26% wide.
(iPhone 7 color standard * accurate color of 41 reference color points under each color gamut of the mobile phone screen)
(iPhone 7 color gamut)
Since iPhone 7 now has two color gamut standards, a new color management system is needed to display sRGB/Rec.709 (regenerated from DCI-P3) with a narrow color gamut. In DCI-P3 mode, 102% P3 gamut is covered, while in sRGB/Rec.709, 104% sRGB gamut is covered.
In addition, iPhone 7 can detect whether the image content is the DCI-P3 color gamut standard, and if it is, it can automatically switch to this color gamut for display.
Screen brightness&contrast
The measured maximum brightness of iPhone 7 is 602 cd/㎡, which is the highest average image level we have tested for all mobile phones (including full screen white display). Although this result is higher than the highest brightness of iPhone 7 claimed by Apple* 625 nites It is lower, but after the automatic brightness is turned on, the peak brightness of iPhone 7 can reach a higher level, but the screen brightness can reach this level only in a strong light environment, so most of the time the screen brightness is around the average value.
We measured that the contrast of iPhone 7 is 1762:1, which is very good for mobile phones. It is also the highest of all IPS LCD displays, even higher than the 1400:1 advertised by Apple.
After the automatic adjustment of screen brightness is turned on, the screen brightness of iPhone 7 can soar to 705cd/㎡ in a bright environment. With such high brightness and low reflectivity, the contrast of iPhone 7 in a high brightness environment is 137 to 160, which is also the highest value we have measured.
Generally, when the light shines on the mobile phone screen, it will form reflection, and then the color displayed on the screen will also be affected, reducing the image contrast. So the lower the screen reflectivity, the better. The lower the reflectivity, the higher the screen contrast, which also has a great impact on the screen brightness.
You can try to take a mobile phone or tablet and turn off the screen. You should see the light reflected on the screen. The higher the brightness of the ambient light, the more obvious the reflection.
The screen reflectivity of the iPhone 7 is 4.4%, which is also the lowest value we have measured, but it is still slightly inferior to the 1.7% of the iPad Pro 9.7 (which uses an AR antireflection coating).
Unfortunately, The AR coating used on the iPad Pro cannot be applied to mobile phones because it is easy to cause wear and scratches. After all, mobile phones are devices that are put in pockets or thrown around every day, so the use of this kind of coating is not very ideal. At present, many companies are developing a coating technology that is not only low reflectivity, but also resistant to operation, It is believed that we will see the birth of such products in the near future. In view of energy consumption limitation and heating problems, low reflectivity technology is crucial to improve the brightness of mobile phone screen.
Chromatic alignment
It is not easy to output the absolute color accuracy of high values, because the colors displayed on the display screen are extremely accurate. In order to achieve accurate color accuracy, the display screen needs to match the standard color gamut currently used by various multimedia content, no more, no less, just right. In addition, the display screen also needs to have accurate Intensity Scale (i.e. gray scale) and White Point.
(iPhone 6&iPhone 7 absolute color accuracy)
We are very impressed by the absolute color accuracy of iPhone 7. The color accuracy of sRGB/Rec.709 is only 1.1 JNCD (Just Noticeable Color Difference* Used to reflect the degree of color deviation ）In the wide color gamut DCI-P3, there is only 1.0 JNCD, which is a perfect synonym.
(iPhone 6&iPhone 7 spectrum)
Average Luminance Accuracy of iPhone 7 under sRGB/Rec.709, the difference between the actual brightness and the required brightness when displaying a certain color. When displaying different colors, the required brightness is also different), which is ± 2%, and it is also ± 2% in the wide color gamut DCI-P3. Such accurate brightness control can provide great help when presenting colors. In night mode, the blue part of the iPhone 7 spectrum is below 490nm.
viewing angle
All iPhones and iPads use IPS LCD displays, so we think the visual angle should be similar to other devices. According to our laboratory tests, the viewing angle of the iPhone 7 is still very good, with almost no perceptible color shift. When viewing the screen at a tilt of 30 degrees in horizontal or vertical, it can still maintain the contrast at 1000:1. However, it is worth mentioning that after tilting 30 degrees, the brightness is affected to some extent, reducing the brightness by 55%.
Screen power consumption is one of the important reasons that affect the endurance. After complex tests in the laboratory, we were surprised to find that the display energy efficiency of iPhone 7 is 7% higher than that of iPhone 6.
Summarize the amazing features of the iPhone 7 screen
The highest absolute color accuracy of all mobile phone displays (1.1 JNCD)
Highest brightness accuracy of all mobile phone displays (± 2%)
Very accurate contrast and grayscale, gamma value is 2.21
Highest peak brightness* 602 nits to 705 nits
The highest contrast in IPS LCD of all mobile phone displays, 1762:1
The lowest screen reflectivity of all mobile phone displays (4.4%)
The color difference caused by the larger observation angle is also the smallest (2.1 JNCD or lower)
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