Vivo officially released its main model of this year, vivo X21, on March 19. The new machine has added a new generation of 19:9 ultra narrow U-slot OLED full screen, and its back is replaced by 3D micro arc glass. It supports 1024 feature dimensions of 3D face unlocking, and is equipped with Qualcomm Snapdragon 660 AIE multi-core neural network acceleration chip. It claims to integrate AI into background management, intelligent assistant, scene camera and beauty scene.

This time, we got the vivo X21 screen fingerprint version with offline fingerprint. If there is no accident, it will be the first offline fingerprint and the first U-slot mobile phone that most users touch. Let's take a look at it now:

Appearance and packaging

The new phone is packed in blue and black, with the logo of "2018 World Cup official mobile phone". The accessories are still very rich, including instructions, pins, data cables, headphones, dual engine fast charging head compatible with QC fast charging (maximum output 18W, model BK-T-01Q, manufactured by Salcom) and original mobile phone case. This generation of mobile phone case is very special. It is made of mixed materials. The side part is soft silicone (anti drop), and the transparent part on the back is hard plastic. The details are well received.

New appearance design

The vivo X21 screen fingerprint version uses a new appearance ID design. The front is a full screen with a powerful U-slot, and the screen proportion is even higher than 19:9. Excluding the U-slot, the screen of vivo X21 screen fingerprint version accounts for 90.3%, which is very close to the APEX concept machine launched by vivo before. Continue to narrow the chin and turn the forehead into bangs, plus 1.66mm left and right borders, the visual effect of vivo X21 screen fingerprint version is more shocking than that of iPhone X with thick borders.

Many sensors are plugged into the U-shaped slot on the top of the vivo X21 screen fingerprint version. The irregular holes on the left side of the earpiece can be seen in strong light. The light/distance sensor and infrared fill light for face unlocking are integrated in it (domestic face unlocking has finally added infrared fill light). The front camera on the right side adds a self timer AR sticker and a 3D depth of field face recognition function of 1024 feature point dimensions.

The back of the vivo X21 screen fingerprint version is changed to a four curved 3D glass. The official claim is that the left and right fall is 2.97mm, the upper and lower fall is 0.57mm, and the side radian is increased and continuous transition with the middle frame. Under the glass is the color treatment process of coating+silk screen, which will have different gloss effects at different angles. Because our machine is a screen fingerprint version, there is no fingerprint opening on the back, so it should be much simpler.

The main camera of vivo X21 screen fingerprint version is a sensor with 2x12 million pixels (24 million light-sensitive units), which supports full pixel dual core focusing, can take photos in two modes of 12 million pixels and 24 million pixels, and can independently collect depth of field information.

The body layout of the vivo X21 screen fingerprint version is very special this time. The card slot usually placed on the left side has been moved to the bottom and placed symmetrically with the loudspeaker opening. Therefore, there is no opening on the left side of the fuselage. The rest are familiar layouts. The top earphone and noise reducing microphone, the right volume and power button, and the bottom are still mirco USB interface and speakers.

The middle frame of the vivo X21 screen fingerprint version is uniformly coated with a bright surface. The appearance and feel are as consistent as possible with the front and back of the glass. The coating directly covers the antenna partition slot of the upper and lower frames, giving a strong sense of integration. In addition, vivo maintains the previous high screen side washer, so that the thickness of the middle frame is conveniently reduced to about 3.1mm, which makes it very thin both visually and tactically. This ultra-thin frame will give you a very amazing sense of shock when you hold it, and even bring the illusion of "edges and corners".

Screen quality

The 19:9 OLED full screen of vivo X21 screen fingerprint version adopts the P3 color gamut standard. In the actual test, the default color temperature is 7716K, and the cold screen is undoubtedly adjusted. The maximum brightness of the full white screen is 416 nits manually. Under the automatic brightness, it can jump according to the ambient brightness, and even reach 557 nits in full white. It's amazing.

This brightness performance is no different from the LCD screen. It is enough to stand on the same starting line as the iPhone X and Samsung's flagship. There will be no major problems when using in strong sunlight. Considering the hardware quality of this screen, if there is no accident, the supplier is Samsung.

At a brightness close to 100 nits in daily use, the 104 color sRGB color accuracy of the vivo X21 screen fingerprint version, with an average deltaE of 5.7 and a maximum of 10.7, is satisfactory.

It is also 100 nits, 104 colors, P3 color accuracy, the average deltaE is 4.8, the maximum is 11.9, and the performance is better.

What should be noted here is that in terms of color management, vivo is very aggressive this time. In addition to the screen with P3 color gamut, the camera of vivo X21 screen fingerprint version, like the iPhone, uses P3 color gamut by default, which is extremely rare in the Android platform.

System and experience

The system version of vivo X21 screen fingerprint version has been upgraded to Fontouch OS 4.0, and the bottom layer of the system has also gone to Android 8.1. The most special thing is that the vivo X21 screen fingerprint version is the first mobile phone on the Android platform that uses the P3 color gamut for default color management. Even the system screenshot is directly out of the P3 color gamut.

Funtouch OS 4.0 has added navigation gestures, which can hide the three King Kong keys on the navigation bar and complete common operations through upward strokes. Its most special feature is that, except for "Back to the Desktop" in the middle, "Multi task Page" triggered by "Stop" in the middle, and "Back" triggered by "Back" in the side, the previous menu key position is the trigger control center.

Because it is equipped with Snapdragon 660 AIE AI acceleration chip, the vivo X21 screen fingerprint version has added many AI and AR functions, such as automatic camera scene recognition and AI beauty. The camera has also added AR cute photography, with a variety of accessories, which can save a third-party app.

The most special feature of the vivo X21 screen fingerprint version is, It must be its screen Fingerprint identification. By default, lifting the phone will Brighten the screen , and there is a prompt in the fingerprint identification area. After the finger is put on, this local area will illuminate the fingerprint with high brightness for detection. In the actual experience, I was a little unaccustomed at the beginning because there was no groove for physical keys. The speed of fingerprint recognition is not as fast as that of Vivo, but it is much faster than what we expected, For beauty , the improvement is worth it.

Well, that's all for this experience. The detailed evaluation will be completed in the near future. Please look forward to it.

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