Intel's Core Projection Eye 13 inch YOGA Tablet 2 Pro Evaluation
Intel's Core Projection Eye 13 inch YOGA Tablet 2 Pro Evaluation

Lenovo released five YOGA tablets in 2014, of which the most special specification is the 13 inch version of YOGA 2 Pro. It is the first tablet with a subwoofer and a built-in projector, and its resolution has reached 2560 × 1440. Now let's see how it performs.


parameter

  • Three dimensional: 333 × 223 × 3.7-12.6 mm

  • Weight: 950g

  • Screen: 13.3-inch 16:10 full fit IPS

  • Resolution: 2560 × 1440

  • CPU: Intel Atom Z3745 (4-core 1.86GHz)

  • GPU: Intel HD Graphic (maximum frequency 778MHz)

  • Memory: 2G (2 * 1G) LPDDR3

  • Storage: 32GB eMMC

  • System: Android 4.4.2

  • Battery: 9600 mAh (3.75V 36Wh)

  • Camera: rear 8 million pixels, aperture f/2.2, sapphire glass protective cover; 1.6 million pixels in front, aperture f/2.4

  • Speaker: dual JBL 1.5W front speakers, rear JBL 5W subwoofer

  • Projection light machine: TI DLP chip, projection module provided by Asia Optical, maximum brightness 50 lumens, resolution 854 × 480

  • Others: Bluetooth 4.0, GPS, 2.4/5GHz dual band 300Mbps Wi Fi



Appearance and workmanship

The package of Android YOGA 2 Pro and the win version are both black cardboard boxes, but the package is smaller and lighter, and the back is still the product parameters.


The packaging is basically the size of the machine. The lower drawer is a part. There is a headset in addition to the warranty manual.


The power adapter is the same as the win version. It supports 5V2A (mobile phone) and 12V1.8A high-voltage charging. There are circular pits on the side.


The speakers on the machine are made by JBL, and the Android version of YOGA 2 Pro even includes earphones. Even in mobile phones, earphones are rarely attached. It's a little surprising to see earphones on the tablet.

The earphone is made of aluminum shell with noodle line design. Three silicone sleeves of different sizes are provided. The earphone socket is also covered with aluminum shell.


The main body of the machine is silver, the front panel frame is black, and the full fit screen does not appear large gray screen; The back still has YOGA's traditional rotatable adjustable support.


When I lit the screen, I found that the border was very wide, especially the lower border with a double chin.


The back of the machine is of all inclusive design, extending to the outside of the black frame of the screen. The product selling point stickers shall be pasted as usual.


The top center is the camera, and the light sensor is near the volume key on the left. It is hidden and can only be found in strong light. The position of the light sensor is not normal. When the machine is lying with both hands, sometimes the screen will be dimmed for some reason because the light sensor is blocked by mistake.


In the middle of the back is the concave brand wiredrawing logo, in the middle of the bottom is the JBL subwoofer and camera, and on the right is the instructions of the special stickers and expense brackets of Intel processors.


Press the button on the left side of the camera to pop up the bracket, which is covered with a nameplate and a hidden card slot. The TF card slot is on the left side of the card slot cover, and the sim card slot is on the right side. But since this is a wifi version, the card slot is just a decoration.


On the left side of the fuselage is the volume key, micro USB, 3.5mm headphone interface, and at the bottom is the power key with concentric circles. There is a circle status indicator light around the power key. There are two mesh openings for 1.5W speakers on the lower side of the front of the fuselage.


On the right is the switch left for the projection function and the miniature projector. The lens glass of the projector has a green coating. The machine leans to the left, not horizontally.

In the projection state, the support needs to be opened at 90 degrees to leave enough heat dissipation space under the optical machine.


The maximum brightness of the light machine is only 50 lumens, which can only be used in the darkroom. There is a push-pull focusing button on the side of the light machine, which may not be made into a knob due to insufficient space. The focusing feel is not very good.


YOGA series can rely on the support at the back, and can switch between three styles: Stand, Tilt and Hold.


The same 13 inch version, the win version on the right side is nearly 1cm narrower than the Android version on the right side, but the Android version's bracket shaft is shorter (one 18650 cell is less installed, and the capacity is reduced to 9600mAh), so the front can put down the speaker.


The body thickness of the two versions is the same. The left side of the win version has more speakers with double openings and less headphone connectors. The most obvious difference on the right side is that in the same position of the win version, there is only a headphone interface, no projector, but there is a micro HDMI interface.

In terms of grip feel, the win version is smaller, but weighs nearly 80g, so it will be quite dense when you hold it. However, the Android version also weighs nearly 950g. Even if it has a scroll shaped side, it is not suitable for a long time Hold on, let the 13.3-inch screen monster stay on the desktop quietly.


The angle of the YOGA bracket can only be greater than 50 degrees, otherwise the bracket will be heavily pressed back by the machine body, and the "prone" mode is required for large angle placement. The machine can automatically change the function of the up and down volume buttons according to the different standing modes, that is, the down volume button always reduces the volume.

It is worth noting that even if the edge of the metal bracket is chamfered, it is still very sharp, and it is easy to scratch the desktop and mouse pad. Usually, you should pay attention to protecting the objects in contact with it


Screen performance

The 13 inch YOGA resolution is 2560 * 1440, surpassing the Surface Pro3 (2160 * 1440). The QHD IPS screen with full fit technology is much more delicate and transparent than the general screen. The performance of the 13 inch YOGA screen of the win version and the Android version is quite similar.

100% brightness shows all black content. There are two small light leaks on the top of the screen, but a large "uniform" light leak appears in the upper right corner. Although the light leakage itself is relatively slight, it does not affect the use, but compared with the win version, the light leakage control is obviously poor (not excluding an example).


The maximum brightness of the screen is 324 nits, 45 nits (279 nits) higher than that of the win version, and even more than that of many middle - and low-end mobile phones. The performance is good.
     

In terms of visual angle, only a very large tilt angle can cause obvious brightness attenuation, which is good in 2K screens. The performance on the death diagonal is also good, with only slight whitening, and the brightness has not significantly decreased.


Although there are differences in screen brightness and light leakage control, the two versions of YOGA are very similar in screen color temperature adjustment. The color temperature is slightly cold, and the hair color is rich and colorful.


System UI

The lock screen interface supports double click closing, but does not support double click wake-up.


YOGA is equipped with LeOS customized based on Android 4.4.2. This system first appeared in LeUI in 2010. Its large rounded rectangle semi cartoon dark icons and desktop plug-ins are very obvious features. Under the general atmosphere of advocating flattening and elegance, this set of UI seems a bit heavy.


Notification Bar

Pull up bar/control center

Task Manager

The notification bar supports the display of calendar events. The pull-up bar/control center centralizes all shortcut buttons. It is an iOS 8 style task manager with a one button cleaning function.


Quick search bar

Multi window application management

The system has partially optimized the large screen tablet. The quick search bar can be called out by drawing on the desktop. There is a multi window application portal on the left side of the virtual key bar. The system supports the windowing of 10 applications, but the system supports opening three of them at the same time.

Usually, although few people use multi window applications, it is more comfortable to watch movies while surfing the Internet. However, the current multi window application cannot adjust its size by itself, so it is troublesome to use Taobao and Weibo.


The system comes with a customized Sogou input method, which has a zoom mode. You can move the position where the keyboard appears by yourself, but still can't adjust the size by yourself. However, the use experience is far better than the full-size blind keys.


The system's own security management application can complete common functions such as permission management, advertisement interception, anti-virus, and acceleration.


Electricity statistics

Turn off the screen and disable the background automatically

Power saving of screen and GPU

The system also has some good features for endurance: abnormal and detailed system power statistics, automatically disabling the background when the screen is turned off (the effect is similar to the green guard), and adjusting the screen brightness and GPU rendering to save power.


System application

The design of the system app and the optimization of the tablet are commendable, and the availability of daily applications is OK, but the screen is too large and the resolution is too high, and many apps fail to make use of the more screen space.


Projection control app

Floating doodle pen app

Dolby Sound Management

The system provides an independent app for its own projector and JBL audio: the projection application is a media manager, which can open the built-in projector after selecting content, and supports only projecting small window content or synchronously projecting screen content; The projection application provides a shortcut switch for the graffiti pen, which can be used to graffiti/erase, return to restore and other operations under any screen content. This function will be very useful when doing PPT demonstration.


shot

The machine is equipped with a camera head with a front position of 8 million (f2.2 aperture) and a rear position of 1.6 million (f2.4 aperture). The photographing interface is very simple. In addition to adding auxiliary lines for composition and a level, there are only several modes to choose, such as panoramic view and night view, which belong to the type of taking photos as soon as you pick them up.


First of all, the rear camera is placed next to the subwoofer. When the bracket is placed halfway, the view may be blocked. However, no one will take photos at this angle, which is not a big problem. The biggest problem of the rear camera is that the focusing speed is seriously slow. Normal manual focusing takes 2-3 seconds, which is not suitable for capturing.


Good In addition, the quality of the rear camera itself is good. The focusing distance is very close, ISO can be pressed to 67 under moderate indoor light intensity, the details are good, and the background illusion effect is also OK (note the outline of the water cup on the right side of the above figure, click the magnifying glass on the upper right corner of all samples to view the original image).


The detail expression of the camera is medium to high among the 8 million pixels, and it is not a problem to beat the 8 million pixels of Red Rice 2. However, the stability of exposure and white balance control needs to be improved.


Under the indoor weak light, the ISO is pulled to 270, and the image noise is obvious; The shutter is 1/17s, and it is easy to shake and destroy the film, but the weak light performance is medium in 8 million.


Sample of rear camera (the original image can be viewed through the magnifying glass at the upper right corner of the stamp image)

Front camera sample (the original image can be viewed through the magnifying glass at the upper right corner of the poke image)

The biggest problem with the front camera must be that it has 1.6 million pixels (1440 * 1080), and can't even use up its monitor point-to-point. Compared with his 8 million rear mounted device, the details of the picture are like wearing glasses and not wearing glasses. In addition, the camera will automatically mirror the image. However, in fact, the video call cannot use too high pixels, and the body is too heavy to take a selfie, so the pixel problem has little impact.


The photos taken by the front camera cannot display detailed information, but from the picture, the high pixel area obtained by low pixels does not significantly reduce the performance of the camera in moderate indoor light. The edge of the camera has a slight purple edge and edge deterioration (cloud at the foot of the squirrel). The sharpness of the whole piece is not obvious, which is relatively natural, but the hair color tends to be rich and colorful.

In addition, the camera has an unbelievable wide angle. It can even take a bust from a normal hand-held distance, which is quite surprising. Although the camera on the tablet is basically a decoration, the front and rear cameras of YOGA have unexpected performance.


Projection

The projector on YOGA uses the DLP chip of Texas Instruments and the projection module of Asia Optics. It is officially announced that graphite, silica gel, copper sheet and other materials have been added for heat control. In actual use, the temperature of the machine can rise and maintain at about 40 degrees after about 5 minutes of projection, and the heat control is good.

The projection can be opened by pressing the projection button on the side or the button in the system control center for a long time. The system can perform automatic trapezoidal correction, but manual focusing is still required. The system supports two projection modes: split screen mode and full screen mode. The former is to project the content in the floating flat panel window separately, while the latter is to project the content of the entire flat panel screen.

In terms of projection placement and adjustment, the automatic trapezoid correction function responds very quickly. However, the push-pull focusing button has poor hand feel and requires high focusing accuracy. If it is not placed correctly, the problem of "focusing on the left but out of focus on the right" will occur. The use experience is not good.

A screen of about 40 inches can be projected at a distance of 1.5m (the TV on the left side of the above figure is 50 inches), with a small projection ratio. The machine must be placed at the back to project a large picture, but the larger the picture, the lower the average brightness of the projection, and the lower the required ambient brightness.


The projection resolution is only 854 × 480, which can be easily handled when watching movies and PPT with large fonts, but it is too hard to display dense text content.


In addition, the brightness of the machine is only 50 lumens. After the indoor lights are turned on, it is almost impossible to see the screen clearly. The main purpose of this projector is to display PPT in the darkroom, and put movies outdoors at night. With its own graffiti application, the PPT display experience is good. But in general, the performance of the projector is not very satisfactory (perhaps the original expectation of black technology is too high?).


performance

When you see a machine with a 2K screen, you naturally worry about its performance. However, the previously tested Windows version can perform well under the same CPU and screen, and the performance of this configuration on the Android platform should not be too bad.

The CPU on the machine is Atom Z3745 of Intel BayTrail-T platform. It is a 64 bit four core four thread, 3D transistor 22nm process, Silvermont architecture, 2MB two-level cache, main frequency 1.33GHz, capable of reaching 1.86GHz, 2MB cache, 4GB dual channel LPDDR3-1067 memory. The GPU is Intel HD Graphic with a maximum frequency of 778MHz.

Compared with the Z3740 launched at the end of 2013, the main change of the Z3745 is that the GPU frequency has increased from the original 667MHz to 778MHz (16%), and it supports dual channel 64Bit memory to support 2K screens.


In terms of running score, the entertainment rabbit scored about 34000 points; Geekbench3 single core scored 783 points and multi-core scored 2386 points, which was between Snapdragon 800 and Snapdragon 801, but the pi calculation was not normal, which took 47.6 seconds, which was weaker than the eight core MT6592 of MediaTek;

In terms of GPU performance, the Manhattan scene of GFXbench 3 is off screen 11 frames, and the Tyrannosaurus Rex scene is off screen 20 frames; A1 SD Bench reads 131.73m/s and writes 63.25m/s; 3DMark Test1 has 86 frames, Test2 60.6 frames, and Physics 54.2 frames, which is even better than Snapdragon 801.


Conscience's masterpiece, the best flying car 17, runs smoothly, almost without jamming, with complete maps and effects, but obviously does not use up the 2K screen resolution.


4K video plays smoothly without pressure, and it can be played as you drag.


Turn on the GPU to display the curve, and the yellow line basically hovers on the green 60 frame warning line (less than 60 frames/s), but the system response curve performs very well and remains low. The overall fluency performance is also consistent with the naked eye, the performance is stable and responsive, but the smoothness is not enough.


Pea pod

TaoBao

micro-blog

In the third-party application of the cancer type, its performance is similar to the system application, which can ensure that the machine is not stuck. However, under the pressure of 2K screen, there is still a gap between the smoothness of vision and experience and the flagship level.


Endurance&Heat&Sound Quality

In terms of endurance, it is almost certain that the Android version will be inferior to the Win version. After all, the CPU and screen will remain unchanged, but the battery capacity will be reduced by 1/4 (9600mAh). In actual measurement, reading, file browsing and other light uses, the battery life is maintained between 8-9 hours, while in games and other high-intensity uses, the battery life is only about 5 hours.

In terms of charging speed, while charging and playing, the charging time may exceed 10 hours, while the direct charging time is about 5 hours, which is the same as the win version, iPad and other similar products.


The standby power consumption is normal, slightly better than that of the iPad. The pure standby power consumption is less than 50% after nearly 15 days, and the standby power consumption for a month is not legendary. Of course, the premise is to turn on the screen off sleep and green various garbage applications.


After the machine has been running GFXBench, Anthare and other running software for 20 minutes, the maximum temperature on the front of the machine body is stable at 36.2 degrees, and the maximum temperature on the back is about 34.2 degrees. The heat distribution of the machine is the same as that of the win version, which is concentrated on the right side of the logo (the internal layout should be similar). At this time, the ambient temperature is 26.3 degrees.

Generally speaking, the heat control is a little worse than that of the win version, but the gap is not big. It is also good in the flat panel.


In terms of volume, because the speaker opening is in the front, the volume is a little higher than that of the win version. When playing the same song (foam), the peak value can reach 86.7 decibels.

The performance of speakers can almost completely apply the evaluation of the win version. The timbre is cold, the sound field is large, and the sense of low frequency is sufficient. The sense of space, amount of information, and analytical power of 2.1 channels are far beyond the conventional notebook, which is more than enough for daily music and movies.


High split screen compatibility

In addition to iOS, Android and Windows platforms have their own problems with the adaptation of high-definition screens. The former is that third-party apps cannot adapt fonts and element sizes, and the optimization and utilization of large flat screens are poor; The latter is that after the element size is forced to be enlarged, many software (including QQ) will have the problem of blurred maps. The measured adaptation of Android tablet at 2K resolution still needs to be improved:

yes The elements are stretched, but the utilization rate of the screen is not high, which is useful for the elderly

ZAKER

Taobao HD

Weibo HD

Boya fights the landlord


Mobile version simple stretching

Pea pod


Gaud map


Mobile web page


WPS


IReader doesn't even support horizontal screen display. With the side of YOGA's scroll, it will really look like a book.


QQ HD straightens without font stretching. Fortunately, the 13.3-inch screen is large enough to barely touch.


Change the browser logo to PC, and the charm of 2K screen will burst out. It will be a little pleasant after watching three screens of content.


summary

The final performance of the 13 inch YOGA Tablet 2 Pro is remarkable: although the family's unique shape is heavy, it is practical; The 2K screen performs well; The system UI has good tablet optimization; Sex can be used but not top; Although the camera has only 8+1.6 million specifications, its performance is far beyond expectations; 8-9 hours' endurance is in line with the standard in the big name tablet; Good heating control and excellent sound quality; However, as the biggest selling point, the projection function needs to be improved.

In general, the 13 inch YOGA Tablet 2 Pro is a competent Android tablet, but it is always compared with the win version of the same door (the five YOGA models launched in the same year are listed above).

Considering the price of Android version up to 3999 yuan, the final comparison formula is as follows: low level built-in projector+additional 8 million pixel rear camera+500 yuan difference=4GB memory+full size windows 8.1+additional 3200mAh battery+excellent workmanship.

It has to be said that Lenovo's price positioning of its own products is very accurate, and it is really difficult to distinguish between the win version and the Android version in terms of cost performance (because neither side is high). Of course, if you really want to buy

In addition, the two versions of the parameter table use the same CPU. The most solemn thought of the author is actually to paint Windows on the Android version


fabulous:

  • The screen performance is good, and the 2K screen is sour and cool

  • With projector

  • The CPU is the same model as the Windows version, and it is possible to install Windows (although not very likely)

Step on:

  • Expensive

  • Poor projector performance

  • The fuselage is large and heavy

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