Aoc i2757fm, aoc i2757fh: обзор, отзыв

Введение

   Hаспространенная на сегодня ситуация: есть у человека в  кармане, скажем, 12 тысяч рублей и он ищет себе хороший монитор. Что значит «хороший» для рядового пользователя?

— с наутральным, живым изображением- удобный в эксплуатации (не греется, не шумит, экономичный и т.д.)- высокого качества изготовления

   Казалось бы, указанная сумма мала для указанных запросов. Действительно, до недавнего времени за эти деньги можно было взять 19-22 дюймовый монитор, в лучшем случае на MVA/PVA матрице. Но времена все-таки иногда меняются в лучшую сторону. На рынок доступных решений начали пробиваться тяжеловесы — мониторы с диагонлью более 24 дюймов на IPS матрицах.

Specifications

The basic specifications of the monitor centre on the fact that it uses a 27” LED-backlit IPS (AH-IPS to be precise) panel with 1920 x 1080 resolution. As with its smaller counterparts this makes use of 6-bit colour per subpixel with FRC (Frame Rate Control) temporal dithering to make it up to 8-bit. This helps reduce cost and is of no consequence to the majority of users if properly implemented. Since this model is designed for the home user it also includes grey to grey acceleration (5ms quoted) which is important for gamers in particular.

It is also worth pointing out that the i2757Fm is only available in certain regions. The AOC i2757Fh which is or soon will be available in other regions is very similar but lacks MHL (Mobile High-definition Link) support on the HDMI ports. Due to model availability we have only included a UK price for this model. The key ‘talking points’ of the specification have been highlighted in blue.

Screen size: 27 inches

Panel type: LG Display LM270WF5-S2A2 AH-IPS (In-Plane Switching) LCD

Native resolution: 1920 x 1080

Colour support: 16.7 million (6-bits per subpixel plus dithering)

Response time (G2G): 5ms

Refresh rate: 60Hz

Weight: 5.7kg (including stand)

Contrast ratio: 1,000:1 (20m:1 dynamic)

Viewing angle: 178º horizontal, 178º vertical

Power consumption:

Backlight: WLED (White Light Emitting Diode)

Typical RRP as reviewed: £230

Conclusion

The AOC i2757Fm is one of several new monitors offering a 27” IPS panel with a 1920 x 1080 (Full HD) resolution. This new breed of AH-IPS panel includes a light matte screen surface that is a lot more forgiving in terms of preserving image clarity and vibrancy than the traditional stronger matt surfaces. Meanwhile the panel type itself offers some potentially very accurate and consistent colours. Whilst the panel itself may not be entirely unique, what AOC have done with the i2757Fm is to unlock all of this potential straight from the box.

Without even having to make specific adjustments to individual colour channels or tweak gamma modes the image produced was rich and lively. This was one of those monitors you can turn on, make some minor changes to on the OSD and then breathe a sigh of relief. If you are using an Nvidia graphics card then you’ll have to make a small adjustment in the graphics driver to get the monitor to output a proper image when using HDMI – but that’s not AOC’s fault. On top of this came a pleasing contrast performance that is really as strong as you’ll see on an IPS panel. Although there were some niggling issues inherent to the panel type, such as IPS glow, the overall distinction between light and dark was satisfying. Coupled with the excellent shade range outputted by the monitor the image was certainly diverse.

When it came to responsiveness AOC had once again unlocked a lot of potential from the panel. The monitor includes a configurable pixel overdrive with 4 distinct settings. This flexibility is certainly nice to have, but it seems that the default setting (‘Medium’) is already very well balanced for both games and movies. There wasn’t any significant input lag to speak of, either, so that’s another box ticked. Further complements can go towards the overall design of the monitor with thin and seamless bezels, a brushed-metal effect trim on the stand and the ability to support the monitor using just the stand neck as a kickstand. On the negative side, to maintain the relatively slender profile there is no option to use an alternative VESA mount which may disappoint some users. For simplicity sake it might also have been nice to see a DVI port or DisplayPort as a more Nvidia GPU friendly connection on the PC. The flexibility offered by the two HDMI ports (one with MHL functionality) and the audio input and output is good to see, though.

Overall the AOC i2757Fm is a well thought-out monitor that really does justice to the relatively new concept of affordable Full HD 27” IPS screens.

 
Donations are greatly appreciated.

AOC I2757Fm, I2757Fh

   Пришло время сменить служивший 8 лет верой и правдой NEC 1970nx. Это отличный 19 дюймовый монитор на S-IPS матрице. Но со временем он стал тесный, а фотографии хоть и смотрелись великолепно, чего-то им нехватало. Стал изучать форумы, предложения, ходить смотреть вживую. Основной критерий — диагональ 24-27 дюймов и IPS матрица. Взору открывались либо откровенно дешевые во всех смыслах хлипкие изделия, на которые было смешно смотреть после старичка НЕКа, либо мониторы запредельной цены.

   Уже было нацелился на покупку 27 дюймового LG вполтора раза превышающего выделенный бюджет, как на одном из иностранных сайтов увидел тест неизвестного AOC I2757Fm.    Увидел, прочитал и понял, что пока не представится возможность посмотреть на этот монитор вживую, ничего другого брать я не буду. Вторая модель называется AOC I2757Fh, ее отличает отсутствие MHL для соединения с поративными устройствами и более низкая цена. В моем случае было абсолютно без разницы есть MHL, или нет.

   Через некоторое время такая возможность представилась. И монитор без капли сомнения был куплен.

Contrast and brightness

Using a Konica Minolta CS-200 ‘Chroma Meter’ we measured the luminance of pure white and black using a range of brightness settings and our test settings and calculated the resulting contrast ratio. The highest white luminance, lowest black luminance and highest contrast ratio recorded are highlighted in black with our test setting results highlighted in blue.

The AOC i2757Fm put in a competent contrast performance, averaging 1070:1 using brightness-adjusted default settings. Because very little was changed for our test settings, the performance was also good, yielding a contrast ratio of 1047:1. The maximum luminance recorded was 254 cd/m2 (very close to the 250 cd/m2 specified for the panel) and the minimum luminance was a nice low 55 cd/m2. This gave a luminance adjustment range of 195 cd/m2 with suitable minimums and maximums. The Dynamic Contrast mode on the AOC was relatively gentle, changing in a gradual and not terribly distracting manner. There was certainly a general bias towards brighter output using this mode with even mixed scenes tending to be overly bright and commonly edging towards full brightness. The screen did dim for darker content but never seemed to get lower than around a third of full brightness. This mode also locks off any gamma or colour adjustments that you may wish to make through the OSD.

And now a small word of caution for users who are particularly sensitive to flickering on monitors. A very common method used to dim backlights on LCD monitors involves pulsing the backlight rapidly on and off to varying degrees, something called PWM (Pulse Width Modulation). This can cause some users to experience headaches, eyestrain or general discomfort even after relatively short periods of monitor use (under an hour). The AOC i2757Fm uses PWM (Pulse Width Modulation) to dim the backlight. This shouldn’t be of concern to most users, but those who know they are sensitive to flickering or are looking to avoid monitors that use PWM should bear this in mind.

Whilst observing the monitor displaying a black screen in a darkened room we observed no noticeable backlight bleed. There was some mild clouding at the top left which manifested itself as small patches of ‘dark grey’ in the surrounding ‘black’ but this was minor. What could be readily observed was ‘IPS glow’, a kind of silver or golden sheen that increases as you move further off-centre in relation to the screen. With a screen of this size you can also observe this to some degree whilst sitting directly in front of the monitor from a normal viewing distance (anything under about 120cm or 47 inches from the screen). You can see how this manifests itself in the ‘viewing angles’ video later on in the review.

Изображение

   Смотреть фотографии после NEC 1970nx оказалось откровением. Наконец-то стало понятно, чего нехватало в изображении НЕКа. Не хватало глубины, не было ощущения пространства, натуральности сложных оттенков и светов.

   В мониторе стоит современная псевдовосьмибитная (6bit + FRC) матрица AH-IPS LG. Cудя по тестам, AOC I2757Fm/Fh имеет более 90% цветового охвата sRGB, довольно корректную передачу цвета даже без калибровки и хорошую контрастность. Для конечного пользователя это означает не только положительные стороны, связанные с просмотром и восприятием фотографий но и маленькими бяками со стороны Windows. Некоторые системные цвета — некоторые иконки, элементы управления, формы в браузере могут выглядеть перенасыщенными, что и произошло в моем случае. Поначалу было необычно, но привык быстро.

   Фотографии отличаются отменной передачей цветов, оттенков, пространства, объема. Панорамные фото смотрятся просто по новому — дымка, цвет воздуха, глубина. Можно даже оценить примерные расстояния до обьектов.   Работать с текстом комфортноб в первую очередь это заслуга разрешения монитора 1920х1080, некоторые считают что такого разрешения мало для диагонали 27 дюймов, но я придерживаюсь иного мнения. Монитор такого размера не будет использоваться на расстоянии 20-30 сантиметров до глаз, а значит большее разрешение с растояния, к примеру, метр даст мелкий шрифт. Зачем?

   После калибровки мной были получены следующие оптимальные, по соотношению цветопередача — яркость — комфорт, настройки:Контраст — 40, Яркость — 40, Гамма — Режим 1, Красный — 47, Зеленый — 52,  Синий — 45.

   Яркость подсветки регулируется ШИМ — к сожалению, специфика большинства современных мониторов разных ценовых диапазонов, не только бюджетных. На глаз мерцания не видно, глаза после длительной работы за монитором не устают. Однако перед покупкой лучше всего перестраховаться и постараться оценить степень комфорта при взгляде на изображение монитора.

Introduction

Recently LG Display have been pushing out some new IPS (In-Plane Switching) panels dubbed ‘AH-IPS’. Some of these offer a unique combination of 1920 x 1080 resolution and a 27” screen size – something not previously seen on IPS screens. This allows monitor manufacturers to produce ‘Full HD’ monitors that can be comfortably driven by PCs that might not have the graphical horsepower to push out 2560 x 1440 pixels in games and other graphics-intensive applications. This resolution is also ‘friendly’ for non-PC devices (Blu-ray players and games consoles) that can run resolutions they are natively designed to handle. Importantly, it also reduces the cost of the product for the end user.

The AOC i2757Fm (sometimes given the title of myPlay) is one such monitor to make use of this new affordable panel variety, from a small but up and coming manufacturer. Another trend that has come into play is the decreasing size of the bezel surrounding the screen. This model makes use of thin and shallow bezels to maximize apparent screen space. Whilst the whole concept looks good on paper it is the substance beneath that is also important. We will be investing this in the grueling gauntlet of game, movie and quantitative tests that follows.

Calibration

We connected the monitor by HDMI to our Radeon 7950 and observed some familiar images, played some familiar games and used the Lagom website alongside a Spyder4Elite colorimeter to assess and if necessary tweak the image. The monitor had respectable image balance using the default settings, although it was a little too bright and cool-looking. Turning down the brightness a touch and changing ‘Color Temp’ from ‘Warm’ to ‘User’ improved things. We adopted the following setting.Brightness= 65 (depending preferences and lighting)

Contrast= 50

Gamma= Gamma 1

Color Temp= User

Red= 50

Green= 50

Blue= 50Interestingly and confusingly this improved the colour balance by giving the image a warmer look than the ‘warm’ preset. It was very close to the 6500K target with any adjustments to the colour channels (even by one point) causing fairly pronounced changes to colour balance. Gamma was also quite well handled using the default ‘Gamma1’ setting, but averaged 2.3 on the grey ramp assessed by the Spyder4Elite on our setup. This was caused by a dip in output brightness for some of the darker shades, making them appear slightly deeper than they should. ‘Gamma2’ yielded an average gamma of 1.9 (and gave the image a washed out look) whereas ‘Gamma3’ gave 2.4 on average. The default gamma setting was therefore the preferred option and actually gave a nice depth to the image.

The overall image was now nicely balanced with a good variety of shades and quite a rich and vibrant look to it. We also tested these settings on our Nvidia GeForce GTX 670 to see if there were any vendor-specific differences in the image. Unsurprisingly, as the monitor was connected using HDMI, the Nvidia GPU decided to send out an incorrect colour signal leading to a bit of a washed-out look. Fortunately this was easy to rectify by setting a custom resolution in the Nvidia control panel, following which our test settings proved optimal on the Nvidia setup. There are several other ways to fix this issue including using a small tool which edits the graphics driver, but setting a custom resolution is simple and effective. The procedure is shown in the video below.

Внешний вид, комплектация, управление AOC i2757Fh

   В первую очередь хочется отметить то, что увидит потенциальный покупатель. Вживую AOC I2757Fm / AOC I2757Fh выглядит здорово. Экран глубоко матовый (НЕ полуглянец), все передние элементы матовые. Глянец лишь сбоку и сзади. Качество сборки с виду безупречно — все зазоры ровненькие, качество пластика отличное, пластик «под металл» выдает себя только на ощупь.

   Монитор можно использовать с подставкой, можно просто поставить на стол, не вставляя в подставку. В таком виде он смотрится компактнее. В любом из вариантов установки аппарат устойчив. Я выбрал вариант с подставкой. Кабели просто висят сзади, никаких ниш под них не предусмотрено, но по сути они и не нужны — сидя перед монитором проводов не видно.

   Поставив 27 дюймовый AOC вместо 19 дюймового НЕКа, впечатлился габаритами. Он казался БОЛЬШИМ. Перед тобой, на столе, вместо монитора появилось второе окно. Первая мысль — а удобно ли будет с расстояния 80 см смотреть в это — была развеяна сразу после включения. Вполне!

   Управление у AOC I2757 сенсорное — кнопок нет, только пиктограммы на передней панели. Оно удобное, лаконичное, а единственный индикатор работы индикаторы в глаза не бьет. Горит либо синим, когда монитор включен, либо желтым в режиме ожидания.

   В комплекте подставка, все необходимые кабели — VGA, HDMI, аудио кабель, диск, инструкция

И — внимание! — тряпочка для протирки

   Подключать AOC можно двумя способами — по VGA и по HDMI. C учетом диагонали монитора, подключение по HDMI намного предпочтительнее. На VGA пиксели теряют четкие очертания, картинка становится более мягкой.

Viewing angles

The Lagom viewing angle tests reaffirmed the strong colour consistency of the display. Having colours displayed accurately regardless of position on the screen (or viewing angle relative to the screen) is an important consideration for many users, particularly those interested in colour-critical work. We observed the following.

• The purple block appeared a strong lilac colour throughout with no obvious pink areas. A very mild pink hue could be seen at the extreme left edge.

The red block was a fairly rich red throughout with no obvious pink hues creeping in.

The green block appeared a nice solid and reasonably deep green without strong yellow pollution or yellow patches.

The blue block was a strong and deep blue throughout.

The Lagom text appeared a blended grey throughout with just the slightest red tint on either side of the screen. This indicates a low level of viewing angle dependency to the monitor’s gamma curve and compares favourably to VA and TN matrices which show obvious red and green transitions.

The video below shows the effect of ‘off-centre’ viewing angles on the image. The first part shows the Lagom text, the second part shows a mixed desktop background and the third part shows a dark desktop background. The mixed desktop background demonstrates that the shifts manifest themselves as a slight change in contrast rather than a significant change in colour. The dark background highlights the aforementioned ‘IPS glow’ which becomes most apparent as a ‘bloom’ or sheen as viewing angle shifts.