Best Mobile Phone Plans: Smartphone Lenovo K3 Note

Content

The difficult economic situation prevailing in recent years, he led ultimately to the fact that most potential buyers of mobile devices have turned their attention to less expensive products, abandoning the idea to acquire the flagship device for twice the increased price. In such a situation to the fore manufacturers able to offer a wide range of inexpensive high-quality products. And this, perhaps, the Chinese company Lenovo currently has no equal. If earlier someone wrinkled his nose in disgust, looking at the “Chinese cheap”, but now many have become not to fat. In the course went Chinese smartphones, and on the shelves of Russian stores mobile technology Lenovo now feel mistress of the situation. The company has a lot to offer to the buyer rather poor, all the more so at some point it prudently, after the infamous Xiaomi, released a line of inexpensive smartphones sold exclusively through online trading. Such models are even cheaper, and lack of boundaries on the Internet causes that domestic users are not is is now working order yourself from abroad is such a low-cost smart phone for less than $ 150.

The hero of today’s review how just one of them. Released after the first model of Lenovo K3, opened a line of vehicles the company sold only through the online store, smartphone called K3 Note is a little expensive, but was at the same time much more powerful hardware platform, doubling the amount of RAM, better camera modules and much more volume battery. This smart phone is quite interesting in itself, but at a price of one hundred and fifty dollars, he became one of the most attractive offerings in its segment.

Main features Lenovo K3 Note (model K50-t5)

SoC MediaTek MT6752, 1,7 GHz, 8 core, ARM Cortex-A53
GPU Mali-T760 @ 700 MHz
The operating system Android 5.0
The touch screen IPS, 5,5 “, 1920 × 1080 resolution, 401 ppi
RAM memory (RAM) 2 GB internal memory of 16 GB
Support for Micro-SIM (2 pcs.)
Support for memory cards microSD
Contact 2G: GSM 900/1800/1900 MHz
Link 3G: WCDMA 850/900/1900/2100 MHz
Data FDD LTE 1800/2100/2600 MHz
Wi-Fi 802.11b / g / n (2,4 GHz), access point Wi-Fi, Wi-Fi Direct
Bluetooth 4.0
GPS (A-GPS)
The camera 13 megapixel, autofocus, LED-flash
Camera 5 megapixel (front )
The proximity sensor, light, accelerometer, electronic compass
Battery 3000 mAh
Dimensions 153 × 76 × 8 mm
Weight 145 g

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Smartphone Lenovo K3 Note comes on the market in the form of industrial packaging from solid unvarnished light brown cardboard glued the lower part of black paper. The main features of the model are listed below on an adhesive sticker, but most of the information presented in hieroglyphs – Smartphone to the Russian market is not officially shipped.

Lean accessory kit consists of a charger (2, 2 A) and the connecting cable Micro- USB, more than anything in the set to the Lenovo K3 Note not invested.

The appearance and ease of use

Lenovo K3 Note does not have a particularly expressive design and attractive appearance. In appearance it is very ordinary simple candy bar, where there is not even a side of the rim, and a large part of the housing is a plastic cover pumps, covering not only back, but also the sidewall. That is all part of the outer body, in fact, consists of a plastic housing so that the front panel with protective glass.

And yet, as soon as the smartphone is in his hand, to him immediately imbued with sympathy. It’s all in a very good combination of parameters – the size, thickness and weight. For such a large mobile device with a very large screen its mass and thickness are more than comfortable. The smartphone is easily held in the hand, providing easy transferred into the pockets of clothing. From finger unit did not slip, matte finish plastic is very pleasant to the touch.

The surfaces here are not rubberized effect, but the device is still quite slippery and not brand. Plastic, by the way, has a slight effect of the “metallic”. In the photos it is not noticeable, but in reality smartphone in bright light looks as if it is made of painted metal, which gives it even more solidity. Smartphone Lenovo K3 Note went very pleasing to look at and touch, that he did not take away.

The cover-casing easily enough removed from the core, this is no problem. Along with cap disappear and side buttons, since they are mounted thereon. That is, with the removed cover unit can not be controlled.

Under the hood hiding conveniently located two card slots for Micro-SIM, and a slot for memory cards format microSD. Jammed card can easily push the other side through a specially provided for this hole. All cards propped up a removable battery, so hot their replacement is impossible.

On the outside of the back of the smartphone as usual placed window in the main camera, dual LED flash and the lattice main speakers, made in the form of an array of small round holes . It’s nice that even in such an inexpensive machine manufacturer has not stinted to deliver high-quality flash of two segments. Flash is able to work as a flashlight using a preset program.

The front panel is completely covered by a protective glass screen without skirting. In the upper part of the screen, in addition to the front sensors and cameras, there is also an indicator of events. His work, the user can customize according to their own discretion through the menu settings.

At the bottom of the screen has a standard range of three touch keys and system management applications. Buttons, unfortunately, have no backlight, Lenovo often suffers from it in their devices an average level or below.

Both the hardware keys on the side faces have a metallized coating protrude out of the case to a sufficient height, are easy to find Blind are springy and sharp turn. In general, any claims to the mechanical controls Lenovo K3 Note no.

Both connectors are located on a single, top, at the bottom there is nothing left except the opening conversational microphone. Micro-USB connector supports the connection of external devices in the mode of USB OTG.

The smartphone is available in three basic variants of color execution of the case: in addition to standard black and white there is also an unusual bright yellow lemon color that looks bright and happy eye. All coatings, as already mentioned, have a light metallic sheen that gives unpretentious used herein plastic more attraction.

Screen

Smartphone Lenovo K3 Note is equipped with a touch IPS-matrix, covered flat protection glass. The screen size is 68 × 121 mm, the diagonal – 5.5 inches. Resolution increased to Full HD (1920 × 1080 pixels), so that the density of points equal to 401 PPI.

The frame around the screen is on the sides of about 3.5 mm, the upper part – 14 mm, but the bottom – all 18 mm. The frame is wide enough, but such a large overall dimensions it is not too conspicuous.

To adjust the brightness You can use the automatic adjustment based on the ambient light sensor, there is also the possibility of smooth adjustment manually. Multitouch technology can handle up to 5 simultaneous touches. There is a proximity sensor that locks the screen for presentation of the smartphone to your ear. The screen can be activated by double tapping on the glass.

The detailed examination using instruments held partition editor of “Monitor” and “Projector and TV» Alex Kudryavtsev . Here is his expert opinion about the screen test sample.

The front surface of the screen is in the form of a glass plate with a mirror-smooth surface, resistant to scratches. Based on the reflection properties of the objects of anti-glare screen is not worse than the Google Nexus 7 screen (2013) (hereinafter just the Nexus 7). For clarity, we present a photograph in which to screen off reflected a white surface (left – Nexus 7, on the right – Lenovo K3 Note, further they can vary in size):

The screen Lenovo K3 Note just a little bit lighter (brightness at 107 against 105 photos from the Nexus 7). Ghosting objects reflected in the screen Lenovo K3 Note very weak, it shows that between the layers of the screen (specifically between the outer glass and the surface of the LCD matrix) there is no air gap (screen type OGS – One Glass Solution). Due to the smaller number of boundaries (such as glass / air) with very different refractive indices such screens look better in high ambient light, but in the case of repair cracked outer glass it is much more expensive, because have to change the entire screen. On the outer surface of the screen there is a special oleophobic (grease repellent) coating (very effective, even a little better than the Nexus 7), so fingerprints are removed much more easily and appear at a slower rate than in the case of ordinary glass.

When manual control brightness and white output field full screen maximum brightness was about 405 cd / m² minimum – 12 cd / m². The maximum brightness is not very high, but given the excellent anti-glare properties, readability, even on a sunny day outdoors should be at a good level. In complete darkness the brightness can be reduced to a comfortable value. The availability of automatic brightness control for a light sensor (located to the left of the front speaker slots). In the automatic mode when the external lighting conditions as the brightness increases and decreases. In complete darkness feature Auto Brightness reduces the brightness to 57 cd / m² (it is very bright, though, if the turn on the Auto Brightness in the dark, the brightness will drop to acceptable 22 cd / m²), in a lighted artificial light office (approximately 400 lux) sets at 175-195 cd / m² (suitable), in a very bright environment (appropriate lighting clear day outside, but not direct sunlight – 20,000 lux, or a little more) maximizes – up to 405 cd / m². As a result, auto adjustment of brightness works, but not quite adequately. At any level of brightness modulation of the backlight is virtually absent, and therefore there is no screen flicker.

This smartphone uses a matrix of type IPS. The micrographs show the typical IPS structure subpixels:

For comparison, you can see the gallery of photomicrographs of screens used in mobile equipment.

However, they subpixels are arranged unconventionally – in the horizontal direction are typical columns, but in each column of the triad of subpixels are shifted by one subpixel first vertically upward and downward through three columns. As a result, the ratio of columns horizontally to the triads of vertical is 3 to 2, that is, the actual vertical resolution on the & amp; frac13; smaller than horizontally. Hereinafter refers to landscape screen orientation. To demonstrate the results of the original layout of the sub-pixels is a snippet of the worlds of black and white stripes across the pixel:

It can be seen that the vertical strips of almost all well-(“almost” – as the light illumination sub-pixels in the black intervals indicates errors the calculation of the intensity of the subpixels) – they are more or less clearly defined. But with horizontal stripes worse: the black intervals is clearly marred, and the alternation of the most prominent locations, that is, the green subpixels, blurs the border strip. However, from the very noticeable artifacts rescued immediately by three factors, firstly, the high for this size screen resolution of their disguises; secondly, the type of test images world typical user is watching; thirdly, the pixel output of fine text in the mobile operating system is still there, and so smoothed bukovki (read – blurred) because of interpolation, which also masks the artifacts due to the offset arrangement of subpixels. The question is, why all this is necessary, and why not just put a regular Full HD-screen, should be addressed to the manufacturer. Probably a little cheaper, but there is a question of legality and guidance on the characteristics of resolution of 1920 by 1080 pixels, because this resolution (remember PenTile RGBG) not even the green subpixels. For doubters shows fragments, exciting the number of pixels is sufficient for tiling calculations screen:

It is easy to produce a count – 12 pixels (triads RGB) across and a total of 8 vertical pixels, ie pixels on the screen is actually just 1920 by 720.

The screen has good viewing angles without any significant color shift even when large deviations from the perpendicular to the view screen without inverting (except the most-dark look at a deviation of one diagonal) shades. For comparison photos, which screens Lenovo K3 Note and Nexus 7 are derived same image, with the brightness of the screen is initially set approximately 200 cd / m² (in the white field at the top of the screen), and color balance on the camera is forcibly set to 6500 K . perpendicular to the screen white box:

The uniformity of brightness and color tone of the white area is good. And the test image:

good color rendition and color saturated both screens, the color balance is clearly different. Now, at an angle of approximately 45 degrees to the plane and to the side of the screen:

It can be seen that the colors have not changed significantly in both screens, but the contrast from Lenovo K3 Note has decreased largely because of the greater lightening black and fall of brightness . And the white box:

The brightness of the screen at an angle decreased (at least 5 times, based on the difference in exposure), but in the case of Lenovo K3 Note drop a little more brightness. Black box rejecting diagonally greatly lightens and becomes purple. Photo below is the show (the brightness of the white areas in the perpendicular plane of the screen direction is about the same!):

And another angle:

When a perpendicular view the uniformity of the black field is good:

Contrast (approximately in the center of the screen) high – about 1130: 1. Response time when switching black-white-black is 22 ms (10 ms on. +12 Ms off.). The transition between shades of gray 25% and 75% (according to the numerical value of the color) and back covers in the amount of 39 ms. Built on 32 points equally spaced on the numerical value of the shades of gray of gamma curve revealed no obstruction of any light, no shadow. Outside the approximating power function is 2.79, which is higher than the standard value of 2.2. This is a real gamma curve deviates strongly from the power relationship:

Because of the dynamic and very aggressive adjust the brightness according to the nature of the displayed image (in dark decreases brightness) obtained dependence of brightness of color (gamma curve ) does not correspond to the gamma curve of a static image, as measurements were conducted at serial output grayscale almost the entire screen. For this reason, a series of tests – Definition of contrast and response time comparison of illumination angles black – we spent the derivation of specific patterns with a constant average luminance, not monochromatic field over the entire screen. Here the dependence of brightness (vertical axis) against time when switching from the black field on white in half of the screen alternately with the average brightness does not change, and the dynamic adjustment of brightness does not work (schedule 50% / 50% ). And the same relationship, but alternate between the fields at the top of the screen (Figure 100% ), while the average brightness is changing and dynamic adjustment of the backlight works full:

In general, such brightness correction can not be disabled nothing but harm does not bring, as it reduces the legibility of gradations in the shadows in the case of dark images. In addition, the dynamic adjustment of the derivation of any image other than the white box at the top of the screen, substantially understates the brightness, which impairs the readability in bright light.

The color gamut is close to sRGB:

The spectra show that the matrix filters moderately mixed ingredients to each other:

As a result, the visual richness of the colors are natural. Balance shades of gray on a scale of poor, as the color temperature much higher than the standard 6500 K and a deviation from the blackbody spectrum (ΔE) in some places more than 10, even for the consumer device is considered to be a poor indicator. Well that while even color temperature varies little from shade to shade – a positive effect on the visual assessment of color balance.