Uniformity and Contrast

The dE numbers for the AOC have looked good so far, but all of those are for the center of the screen, where backlighting should be the most even and the image should be at its best. To make sure the monitor will give a good overall experience, we also take a set of 9 measurements across the screen using the Gretag Macbeth color chart and see how it does.

LCD Color Uniformity

The color uniformity across the monitor is surprisingly very good, with very little deviation across any of the colors. The grayscale doesn’t perform quite as well, with the center having an average dE below 1, but a couple other measurements hovering in the range of 2-3 dE. Even the two worst locations still maintained an average dE of 2.55 or less, and the majority of all the results were below 2.0 dE. Overall it has very uniform color across the display.

Since LCD panels are all lit by their backlight to provide color, any errors across the screen can often be traced back to a backlighting system that is uneven and causing those color shifts. As we look at the brightness level across the display when the center is set for 200 nits, we see the drop-off at the bottom of the screen. If the LCD panel itself is behaving the same no matter the location on the screen, the different amounts of light can easily cause the shifts in color that we saw in the last test. Here the locations that had the worst dE uniformity also have the worst brightness uniformity, which is likely the root of the problem.

Once we have found the issues with the brightness, we check to see how well the backlighting system handles darkness across the display. With the AOC there seems to be significant light leakage in the corners of the display, with black levels that are very, very high for the display. I’ve recently seen LED backlit models with good control of the backlight that can get down to very low black levels, but the black levels in the AOC remain high. Some of this is due to the IPS panel, which typically has higher black levels than other panel types. It also could be an area where corners had to be cut to make the aggressive price point that AOC targeted. Regardless of why, the absolute black level is not going to please people that are adamant about deep, dark blacks.

Calibration and Results Peak Levels, Contrast, and Color Gamut
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  • sviola - Wednesday, February 1, 2012 - link

    Ok. Thanks for the info. So I'll still keep my Dell WFP2007.

    I really want someone to release a 120Hz IPS with 1920x1200 resolution.
  • JFish222 - Tuesday, January 31, 2012 - link

    When I read these monitor reviews I often see a great deal of info on color calibration, contrast etc. but would it be possible to add a new metric to the reviews?

    I am specifically interested in text clarity and eye strain.
    How would a given monitor compare for reading/heavy text usage?

    As a developer I spend an incredible amount of time in front of the screen. I'm not sure what metrics correlate to a "good" viewing experience but a test around such criteria would be fantastic for the office workers and monitor jockies among us.

    I have 7+ diff. monitor models at my office. And have found that some monitors are much easier on the eyes than others. We have a particular 22inch Dell IPS (about 5 years old now) that I would rate the best, but can't tell you what qualities provide such a comfortable viewing experience. There are other IPS monitors that do not match it, its pixel density is avg among our models, etc.

    Would something like this be possible?

    Thanks for another great review,
    - J
  • mr2kat - Monday, February 6, 2012 - link

    I have two of these monitors which I use for C# and asp.net development along with web design. My gold standard are my Dell PVA 24 inch monitors (I now have six 2408 monitors in total) and I also have 2 Dell IPS monitors (U2410's). I reject TN monitors as unusable for every day programming and design work.

    I was concerned that text would appear fuzzy because these are e-IPS monitors, but in daily use I see no significant difference between this monitor and my U2410's.

    The LED back-light does provide higher contrast but after calibration I still prefer my U2410's. For programming I like to rotate my monitor display by 90 degrees, and I usually have 3 of these lined up side-by-side or two in the vertical and one in the horizontal attitude. Unfortunately the AOC monitor cannot be rotated and does not have height adjustment. However the monitors run incredibly cool and I am using them for web development.

    My criteria (for work usage) is:

    Viewing angle
    Banding and color accuracy
    Ergonomics (adjustment potential)
    Eye strain and headache issues from long term use (>18 hours per day)

    Relative to my Dell monitors, the AOC scores 9, 8, 3, 10 respectively. Against this, the best 120Hz TN monitor scores 2, 7, 9, 2. So I would say they are worth the price bump over TN for office and extended work usage.

    I really wish they came as 24 inch monitors but on the odd occasion I watch media content the AOC is close to ideal. I have no ghosting on my displays (I use only the 2 hdmi connectors of course).

    I still prefer my 2408's for day-to-day use, and until the AOC's arrived I considered the U2410 / Z24 to be the ideal compromise monitors. Despite ergonomic limitations the AOC is an excellent display and I will be buying more of them (I have 3 separate work stations in daily use). They set the minimum for acceptable workstation display IMUO.
  • slypher1024 - Saturday, February 4, 2012 - link

    Any plans on reviewing the LG IPS236V or HP ZR2440w?
  • svojoe - Saturday, March 3, 2012 - link

    As per this article, I decided to buy this monitor.

    But I've had some problems, I have my second one now and I cannot get any display to show up on HDMI, I have tried 2 different cables and 3 different computers (two intel HD3000 and one ATOM/ION netbook) and I get nothing. I get output on VGA but not HDMI. AOC engineer told me I had a dud to RMA it. I did and my replacement is here doing the exact same thing. I need this monitor for a time sensitive deadline project and not having the extra screen space is hurting me.

    No a single word on the net about problems with this monitor. But something us up for me to get two ;(
  • svojoe - Saturday, March 3, 2012 - link

    After a day of tinkering I was able to figure it out. Its a windows 7/Intel HD driver issue. Default settings on Win7 Display modes would not allow it to be detected until i deleted all drivers for display and really messed around with the 'projector/external display settings'. Now it shows up.

    and it LOOKS AMAZING!
  • Welliam - Saturday, March 24, 2012 - link

    Hi,
    I want to buy this monitor but some say it has blur in FPS which I play all the time. but I really like this monitor is it possible to adjust the vertical and horizontal refresh lines to prevent blur ?

    please advise from people have this monitor I dont have another IPS choice near my place.
  • Pratyatosa - Tuesday, September 25, 2012 - link

    1. When plugged into a switched outlet, can it be made to power up without having to press a power-on button?

    2. Can the speakers be made to work with the digital audio from the HDMI cable?
  • chamilafernando - Saturday, October 20, 2012 - link

    Can someone confirm me this actually have an audio output please ?

    Tx
  • taeyeonwong - Sunday, January 20, 2013 - link

    Hi! I've been looking for an external monitor for my MacBook Pro 13-inch Early 2011. Would this be a good monitor for my computer? I'm looking for a monitor that will display extremely crisp text, display accurate colours (vibrant colours) and doesn't lag when watching videos. I don't want ghosting or any bleeding either. Would this be a good monitor?

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