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Three 27" IPS LCDs: UltraSharp U2711, DS-277W, And MultiSync PA271W

Black And White Uniformity, Viewing Angles

Another measurable aspect of panel performance is brightness uniformity. Most manufacturers calibrate displays based on the center point of the screen. However, every area of the screen behaves differently. Sometimes you can get better performance in one specific region. As a result, we added a nine-point black and white luminance test to measure the performance of each monitor's panel.

Dell UltraSharp U2711
White Luminance cd/m^2
181.2630180.5343142.577
195.8545200.0100160.9077
200.0313202.1060172.9605
Black Luminance cd/m^2
0.27370.19500.2309
0.30240.27260.1787
0.37270.25800.2184

The U2711 appears to have slightly poor white luminance in the upper right-hand corner and poor black luminance in the bottom left-hand corner.

DoubleSight DS-277W
White Luminance cd/m^2
187.7542177.9022162.4172
194.8163199.1000166.1605
200.4431202.9104165.4207
Black Luminance cd/m^2
0.79400.84870.7247
0.79600.78120.7308
0.90600.89920.8512

Black luminance is fairly even, though this doesn't alleviate the poor contrast issues cited earlier. The DS-277W demonstrate less uniformity with respect to white luminance, as there's a noticeable deficit on the right-hand side. Color production isn't affected when you view the display at wider angles, but the lack of white uniformity makes the right side seem slightly less vibrant than the left side.

NEC PA271W
White Luminance cd/m^2
186.8910190.8966173.7275
193.0134201.6654185.0052
186.3268196.0234184.4747
Black Luminance cd/m^2
0.19970.17100.4115
0.18140.20060.1669
0.35190.27610.1792

We are able to calibrate the center of the screen to 200 cd/m2, but this offsets other regions, as white uniformity radiates outward from the center. Black luminance seems to behave differently. In the upper right- and bottom-left corners, the PA271W struggles to produce deep blacks. But this is only apparent if you're viewing the monitor at extreme angles.

  • terr281
    What monitors to review next?... As many people said in the review of the 22" TN panels from your last review, the next review should include "enthusiast available" ~23" panels. (Instead of just big box "Buy from Best Buy" models.)

    The lowest price of the three 22" TN panel monitors you reviewed was $180. A quick Newegg search shows several similar panels from names such as Acer, Asus, etc. starting at $140. (And, in the gaming, as well as office environments, 2 or 3 monitors are now more common than one single large one.)
    Reply
  • nevertell
    IPS vs VA in gaming.

    Although just a regular sum up of the available 22-24 VA panels would be great.
    Reply
  • Thank you for the excellent and thorough review. Perhaps next time, the new Apple 27" Thunderbolt display can be thrown into the mix. For a lot of video and photography pros like myself, the Apple display is considered to be the "standard" and I would love to see how it stacks up again the competition. Also maybe throw in a professional level Eizo display as well to show the difference between a ~$1000 display and a $3000 display.
    Reply
  • The new Apple Thunderbolt 27" display - would be nice to see if it's worth the money
    Reply
  • 120hz monitors lead the way

    You should review a 2560x1600 120hz IPS monitor.

    Oh wait...
    2560x1600 isn't supported at 120hz over DVI-D (dual link)
    IPS monitors can't do 120hz with today's technology

    Bummer!

    :(

    F
    Reply
  • agnickolov
    I'd recommend the same IPS review applied on affordable 24-26" monitors that most of us would actually potentially buy. It's nice to dream about 27"+ 2560x1440, but let's get back to reality with 24" 1920x1080 and 1920x1200 (if still available) IPS monitors please. (At least until higher resolutions enter mainstream price points.)
    Reply
  • crisan_tiberiu
    I have a 22" Philips LED Backlight monitor and i am very happy with it . I dont see any Philips monitors in any of your reviews, why is that? :)
    Reply
  • boletus
    Nice roundup, it had me measuring what a 26" wide monitor would look like on my desk. However, you need to fix the title block in the table for the NEC monitor on the "Black And White Uniformity" page (it says Samsung S22A350H).
    Reply
  • soccerdocks
    On the "Black And White Uniformity, Viewing Angles" page the 3rd table states that it is for the Samsung S22A350H when it is actually for the NEC.
    Reply
  • Thank you for this comparison, very interesting reading!

    I am somewhat disappointed that 27" monitors nowadays don't use 2560*1600 panels.
    That resolution makes much more sense to me for a monitor that is not targetted at the average consumer.
    Personally I would love a 2560*1920 (or 2048) screen @ 120Hz, but if I understand correctly link speed becomes an issue here.

    Why is it that displays for mobile phones are increasing in pixel density, but desktop displays don't improve in this regard?

    For a next review I would really like to get a better understanding of (high-resolution) 120Hz monitors. What are the (dis)advantages of 120Hz for regular/2D usage, etc...
    Reply