Interesting observation about dual screen Vivo Nex by Engadget and how it works and functionality of the dual screen.
https://www.engadget.com/2018/12/11/vivo-nex-dual-display-edition/
1.First of all an in-display fingerprint reader -- now at its fifth generation which unlocks in 0.29 seconds.
At opposite Vivo Nex using 3rd generation while 4th generation is at Vivo X23 model.
2. It's also pretty easy to switch between the two screens on this NEX: You can either pull out the control center from the bottom and tap the shortcut at the bottom right, or enable the three-finger gesture in settings and drag from left edge of either screen, or quickly tap the left multi-purpose button to toggle the switch (long press to summon Vivo's Jovi assistant) -- this is always the left button no matter which screen you're using, with the one on the right serving as the power button.
3. In addition to the 12-megapixel camera, 2-megapixel assistive camera (for bokeh and enabling "Super Night Mode") plus the usual LED flash, the NEX Dual Display Edition offers a "Lunar Ring," which acts as a selfie soft light surrounding the dual camera. The top half consists of 16 LEDs, whereas the lower part overlapping the rear display uses the AMOLED pixels to produce the light. This is supposed to offer prettier selfies as it spreads the light across one's face more evenly. When not in use, this ring also doubles as a notification light
So something useful that I would like to have on Vivo Nex is Lunar Ring and act as notifications light since we don’t have neither led notifications as well neither proper AOD with full app notifications.
4. Needless to say, the camera comes with many dedicated software features, including the usual AI face beautification and face shaping. Interestingly, it can even do body shaping if you're very conscious of yourself.
To take full advantage of the secondary screen, there's a Mirror Mode which is self-explanatory: While you're taking photos of a person using this phone, the rear display shows a live view of the subject -- just like a mirror -- which allows him or her to adjust pose where necessary. There's also a Pose Director mode which uses the rear display to show pose suggestions picked from Vivo's image library.
5. Another unique feature here is the Time Of Flight 3D camera, which is used for faster (0.35 seconds) and more secure (300,000 dots) facial recognition and enhanced facial beautification. It also serves as an AR measuring tool -- much like what Google's Project Tango touted back in the days.
6. Alas, there's still no NFC. One possible reason is that Vivo is promoting the use case of QR code-based mobile payment -- a common method in China -- using its rear display, meaning you won't have to flip the phone around. In other words, Vivo doesn't think much of NFC-based mobile payment, and it's also saving a bit of manufacturing cost here, too.
So all above is the basic features and functionality offer dual screen.
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