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We continue the story about the Samsung Galaxy S7 Edge. In the first part of the article was thoroughly tested product performance and described its design. Now we will examine other key aspects, first of all – the quality of the screen and the camera, battery life. And, finally, to share with you the experience of using a smartphone to extreme conditions.
Screen
As we noted in the first part of the article, in the Samsung Galaxy S7 Edge manufacturer has decided to bet on the average diagonal screen – smaller than the Galaxy S6 Edge +, but more than in the Galaxy S6 Edge. At the same time, the resolution remains ultra (2560 × 1440). And visually screen really makes a great impression. Instrumental display test conducted editor section “Projectors and TV” Alexey Kudryavtsev. Below -. Finally, it
The front of the screen surface is a glass plate with a mirror-smooth surface, resistant to scratches. Judging by the reflection of objects, anti-glare properties of the screen is not worse than the Google Nexus 7 (2013) (hereinafter referred to just the Nexus 7) screen. For clarity, we present a photograph in which to screen off reflected the white surface (the left – the Nexus 7, right – Samsung Galaxy S7 Edge, further they can be distinguished by size):
The screen Samsung Galaxy S7 Edge slightly darker ( Picture brightness 103 against 111 in the Nexus 7, the bent edge glare from the screen test are excluded) and does not express the hue. Ghosting objects reflected in Samsung Galaxy S7 Edge screen is very weak, it indicates that the screen between the layers there is an air gap. Due to the smaller number of boundaries (glass / air type) with very different refractive indices of the air gap without screens look better in high ambient light, but in the case of repair cracked outer glass is much more expensive, because have to change the entire screen. There is a special oleophobic (grease repellent) coating (effective, better than the Nexus 7) on the outer surface of the Samsung Galaxy S7 Edge screen, so fingerprints are removed much easier, and appear at a slower rate than in the case of ordinary glass.
when displaying a white field on the entire screen and manual control its brightness maximum was 410 cd / m² minimum – 1.6 cd / m². Also keep in mind that in this case is less than the white area on the screen, so it is lighter, that is, the actual maximum brightness of white portions is almost always higher than the specified value. As a result, the readability of the day in the sun to be at a sufficiently high level. Lower the brightness level without problems to use the device, even in complete darkness. Powered automatic brightness control according ambient light sensor (located to the left of the slot of the front speakers). The operation of this function, you can make adjustments by moving the slider settings. Next to the three conditions give the values of the brightness of the screen for three values of this setting – to 0%, 50% and 100%. In total darkness automatic brightness is reduced to 1.6, 7.9 and 7.9 cd / m², respectively (the first – too dark, second and third – after adaptation of the eye and can normally) under office illuminated by artificial light (approximately 400 lux), the brightness is set at 1.6, 130 and 405 cd / m² (a bit dark – at the time – yarkovato, which corresponds to a predetermined correction), in a bright environment (appropriate lighting clear day outside, but not direct sunlight – 20000 lux or slightly greater) – is increased to 520, 540 and 540 cd / m² regardless of the position of the slider. These values are greater than the maximum for manual brightness adjustment and this should definitely be enough to ensure that the screen is well varied in any natural environment. In general, the result of the automatic brightness adjustment function as expected. Note that even if a smartphone does not allow to disable automatic brightness correction in dark surroundings set the brightness above 190 cd / m². At present any significant level of brightness modulation frequency of about 60 or 240 Hz. The figure below shows the dependence of brightness (vertical axis) against time (horizontal axis) for multiple brightness settings values:
It can be seen that the maximum and close to its brightness modulation amplitude is very large, as a result, and there is no visible flicker. However, with decreasing brightness modulation appears with a large relative amplitude. Therefore, the presence of such modulation can already be seen in the test for the presence of stroboscopic effect, or simply by rapid eye movement. Depending on the individual sensitivity is flickering can cause fatigue
In this screen uses a matrix Super AMOLED -. Active matrix organic light emitting diode. A full-color image is generated via the subpixels of three colors – red (R), green (G) and blue (B), but the green subpixels twice that can be designated as RGBG. This is confirmed by a fragment micrographs:
For comparison, you can see the gallery micrographs screens used in mobile machinery
In the snippet above, you can count 4 green sub-pixel, 2 red (4 halves) and 2. blue (a 1 and 4 quarters), while repeating these fragments, it is possible to lay out the whole screen without gaps and overlap. For such matrices, Samsung has introduced the name PenTile RGBG. Screen Resolution manufacturer believes the green sub-pixel, the other two, it will be two times lower. The location and shape of the subpixels in this embodiment close to the case Samsung Galaxy S4 screen and some other newer Samsung devices (not only) with AMOLED displays. This option PenTile RGBG better than the old one with the red squares, rectangles and blue stripes of green subpixels. Nevertheless, some irregularity contrasting borders and other artifacts are still present. However, due to the very high resolution, they minimally affect the image quality.
The screen is characterized by excellent viewing angles. However, the white color when you reject even small angles alternately takes on a light blue-green and pink color, but black is just black at any angle. He is so black that the contrast option does not apply in this case. When viewed perpendicular to the uniformity of the white area is excellent. For comparison photos, which screens Samsung Galaxy S7 Edge (profile Main ) and second comparison participant displayed the same image, with the brightness of the screen is initially installed about 190 cd / m², and color balance on the camera forcibly set to 6500 K. white box:
It should be noted the excellent uniformity of brightness and color tone of the white area (except for dimming and color change to the curved edges). And the test image (profile Main ):
Color reproduction is good, the color moderately saturated, color balance from slightly different screens. Note that in this case takes a picture height (in this orientation, the screen) to display all the available image area, and comes to the folded edge of the screen, resulting in distortion and color darkening. these areas are almost always also in light glare, which further interferes with viewing the picture on the screen. Even a picture of movies with an aspect ratio of 16: 9 sets in the bends, which greatly interferes with viewing the movie. The photo above was obtained after selecting Profile Main in the settings screen, all four of them:
Profile Adaptive Display is different some sort of automatic adjustment of color to the type of the displayed image and environmental conditions, which is obtained by choosing the two remaining sections shown below.
the saturation and color contrast markedly increased.
Weight all the same high, but the color contrast closer to normal. Now, at an angle of approximately 45 degrees to the plane of the screen and to the side (profile Film AMOLED ). White box:
The brightness at an angle of both screens has decreased significantly (to avoid strong dimming, shutter speed is increased in comparison with previous pictures), but in the case of Samsung brightness drop is much less pronounced. As a result, when formally equal brightness screen Samsung Galaxy S7 Edge visually looks much brighter (compared to LCD screens), as the mobile device’s screen is often necessary to look at least at a slight angle. And the test image:
It can be seen that the colors have not changed much in the two screens and the brightness of the Samsung angle is much higher. Switching state of the matrix elements is carried out almost instantly, but the step width of approximately 17 ms (which corresponds to the refresh rate of 60 Hz) may be present on the inclusion of the front. An example of such dependence of the brightness on the time of the transition from black to white and back again:
In some circumstances, the presence of such a step may lead to loops, trailing behind moving objects. However, dynamic scenes on the OLED screens films are characterized by high precision, and even some “twitching” movements.
For profiles Photos the AMOLED and Main Built on 32 points equally spaced on the numerical value of the shades of gray of gamma curve revealed no blockage of any lights or in the shadows, and the figure approximating the power function is 2.14, which is slightly smaller than the standard value of 2.2, while the actual gamma curve is a little deviates from the power-law dependence (in the signatures given in parentheses are index approximating the power function and the coefficient of determination):
to Profile film AMOLED gamma curve has a pronounced S-shaped, which increases the visible . contrast of the image, but in the shadows of shades distinctiveness persists
Recall that in the case of the OLED-screen, the brightness of image fragments dynamically varies according to the nature of the displayed image – decreases for light in the whole image. As a result, the resulting dependence of the brightness of color (gamma curve), most likely, a little does not correspond to the gamma curve of a static image, as measured when the serial output grayscale almost the entire screen.
The color gamut in the case Profile film AMOLED is very wide, it almost covers the Adobe RGB coverage:
When you select a profile Photos AMOLED coverage is urged to Adobe RGB borders:
When you select a profile main coverage is compressed to sRGB boundaries:
No compensation components of the spectrum very well divided:
In the case of Profile main with a maximum color correction components are already noticeable are mixed together:
note that on the screen with a wide color gamut without a corresponding color correction ordinary images that are optimized for sRGB devices, look unnatural saturated. Hence the recommendation – in most cases, watch movies, photos, and all natural is better when choosing a profile Main , and only when the picture was taken in the installation of Adobe RGB, it makes sense to switch the profile on the Photos AMOLED . Profile Film AMOLED , despite the name, the least suitable for watching movies and generally what would be-it may.
The balance of colors to grayscale good. Color temperature profile Film AMOLED 6500 K is much higher, in the remaining two – close to 6500 K, while at the scale of significant gray area, this parameter does not change very much that improves visual perception of color balance. Deviation from the spectrum of blackbody (ΔE) in most parts of the gray scale is less than 10 units, for a consumer device is considered a good indicator, and also highly variable:
(the darkest areas of the gray scale in most cases can be ignored, as there is a balance of colors is not of great importance, and the error of measurement of color characteristics at low brightness large.)
let’s summarize. The screen has a very high maximum brightness and has excellent anti-glare properties, so the device without any problems, you can enjoy the outdoors even sunny summer day. In complete darkness the brightness can be reduced to a comfortable value. Acceptable (as in bright light – you need to) use a mode with automatic adjustment of brightness, works adequately. The advantages of the screen you need to include good oleophobic coating, as well as close to the sRGB color gamut and acceptable color balance (when you select Profile Main ). At the same time remind about the general advantages of the OLED-Display: true black (if anything does not affect the screen), excellent uniformity of the white box, much smaller than the LCD, falling brightness when viewed at an angle. Disadvantages include modulation of the brightness of the screen. Users who are especially sensitive to flicker, because it may occur fatigue. However, in general, the screen quality is very high. Separately, we note that in terms of image quality from the bent edges only harm, since this design discovery makes a very noticeable distortions in color tone and reduces brightness at the edges of the image, and also leads to the inevitable glare at least along one long side of the screen under conditions of ambient light .
video Playback
MHL interface as the Mobility DisplayPort, we have not found this smartphone, so we had to limit ourselves to test video image display device itself. To do this, we used a set of test files are moved to one division per frame arrow and a rectangle (see., “Methodology for testing the playback device and display video. Version 1 (for mobile devices)”). Screenshots delayed 1 to help determine the nature of the output video frames with different parameters: varied resolution (1280 x 720 (720p), 1920 x 1080 (1080p) and 3840 to 2160 (4K) pixels) and frame rate (24, 25, 30, 50 and 60 frames / sec). In the tests we used the Video Player MX Player in the “Hardware” mode. The test results are summarized in the table:
Note: If both columns Uniformity and Passes exposed green estimation, this means that, most likely, when viewing movies artifacts caused by uneven and interleaved frame pass, or not visible at all, or the number and visibility will not affect the comfortable viewing. red mark indicate possible problems with reproduction of associated files.
According to the criteria of the output frame quality video playback on the screen of the device is very good, as the pictures (frames or groups) can be displayed with more or less uniform alternating intervals and without dropped frames. When playing video files with a resolution of 1920 x 1080 (1080p) on your smartphone screen video image itself is displayed right on the border of the screen, going to the bends. The clarity of the image is high, but imperfect, as by interpolation to the resolution of the screen can not escape. However, for the sake of the experiment can be to switch to a one to one pixel, the interpolation in this case will not, but it was especially the PenTile – vertical world through the pixel is in mesh, and the horizontal – slightly greenish. This is true only for viewing test the world on real frames described artifacts are missing. The displayed brightness range actually corresponds to the standard range of 16-235 – in the shadows and highlights in just a couple shades merges with the black and white, respectively,
Experience with Samsung Galaxy S7 Edge revealed that the folded edge in any way. harm the image when watching a movie – about them soon completely forget, and the headphones do an excellent job with the audio output even in the conditions of the road noise at a low volume speech characters legible, and the neighbors are your movie can not hear
Camera
on the occasion of the release of the new flagship company Samsung has decided to gather journalists and bring them to the “near Moscow,” so that they could appreciate the smart phone in the harsh conditions, without being distracted by work, social networks and other machinations of the dark forces. However, near Moscow, the relevant required harsh conditions, turned out to be the Karelian coast of the Kandalaksha Bay of the White Sea – in fact, the Arctic. There’s our editor section “Digital photo” Anton Solovyov and tested the smartphone camera. Below – his detailed report.
The Samsung Galaxy S7 Edge upgraded camera module in the overall program to improve consumer qualities, as in the case of many other features of this model. The lens is now characterized by a relative aperture of 1: 1.7, the pixels on the sensor are even greater, reaching 1.4 micron size (you can even recall the “famous” ultrapikseli HTC), and each became a double for faster focusing.
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