Vivo's dual-screen phone enables a notch-free design.

Chinese smartphone brand Vivo has unveiled the Nex Dual Display Edition, giving fans OLED displays on the front and back of the smartphone.

In this take on the dual-screen phone, the second screen on the Nex Dual Display Edition is all about selfie shots and being able to customize the look of the phone with photos.

The phone features two Super AMOLED full-HD displays, with a main 6.4-inch screen and a 5.5-inch screen on the back.

It also comes with a huge 10GB of RAM, 128GB built-in storage, Snapdragon 845 system-on-chip, a fingerprint reader in the screen, and a triple rear camera setup that includes 12-megapixel, two-megapixel, and Time-of-Flight lenses.

There is no need for a front-facing or 'selfie' camera on the two-screen phone since the rear cameras, combined with the second screen, allow for selfies. With no front-facing cameras and the in-screen fingerprint readers, there's also no notch on the front display.

The rear screen meanwhile also allows the user to see themselves, say, when a friend is filming them using a camera mode that Vivo calls Mirror Mode, while a Pose Director mode can display a posed image or video on the rear display that a subject can then imitate.

There's also what Vivo calls a Lunar Ring on the rear display, positioned above the three cameras, which creates a glowing band of colors for notifications and can pulse with music.

Vivo doesn't say what capacity battery comes with this two-screen edition Nex, but CNET notes that the standard Nex has a 3,500mAh battery. That's not much given it will need to support two screens, but they'll probably only be on when needed.

The dual-display Nex will be available in China, Hong Kong, Singapore and Taiwan from December 29. The phone would cost about $725 when converted from the Chinese retail price of 4,998 yuan.

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There is no need for a front-facing camera since the rear cameras, combined with the second screen, allow for selfies.

Color choices can significantly cut how much power an OLED screen uses, Google explains.

Google demonstrated how dark mode minimizes battery drain from the screen

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Google's Android Dev Summit zeroed in on "the cost of a pixel color" yesterday where it revealed how much various colors in apps tax a battery.

While it's well known that screen brightness uses up more power on LCD screens, Google has been analyzing how different colors impact the battery on OLED screen devices, like the Pixel 3 and the iPhone XS.

Black on OLED screens is known to use less power because the LEDs that make up each pixel are off, whereas displaying white means the LEDs need to shine and consume power.

As Google presenter Chris Banes noted, the screen itself is one of the biggest drains on battery, so the company has been looking at ways developers could minimize the screen's power usage.

Google Maps in night mode caused the display's power usage to fall by 63 percent compared with normal mode. Night mode didn't use any less power on an iPhone 7 with an LCD screen.

Google drilled down further into how different colors impacted power usage. While black uses the least power and white uses the most, Google found that blue used 25 percent more power than green or red.

The company also admitted that it's been leading developers down the wrong path with Material Design, which encourages developers to use bright colors and lot of white.

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"Guess which color we've been pushing you to towards over the past couple of years? The material came about three years ago. We changed from Holo, which is a nice dark theme, to a white theme instead. We kind of shot ourselves in the foot slightly in terms of power," Banes said.

While many of Google's apps are heavy on white, some apps like YouTube do feature dark mode and as demonstrated, its use can significantly cut the amount of power a display is using.

https://www.zdnet.com/article/google-heres-why-dark-mode-massively-extends-your-oled-phones-battery-life/ At full brightness on a Pixel, YouTube in the dark mode used 43 percent less power than normal. When the video was paused, dark mode saved 60 percent.

On GBoard dark mode saved 21 percent at full brightness. On Google Maps, even at full brightness, using night mode can save about 30 percent of the battery.



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