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Results: Viewing Angles And Uniformity

Asus PB287Q 28-Inch 4K Monitor Review: Ultra HD For $650
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The more monitors we test, the more we can see that off-axis viewing performance is dependent not only on pixel structure (IPS, PLS, TN, etc.) but the backlight technology as well. And we can see that the anti-glare layer makes a difference too.

Ultra HD does not affect off-axis viewing performance in the slightest. The PB287Q clearly suffers from the same issues as other TN-based monitors we’ve photographed, though. If you sit closer than 24 inches, as you might be tempted to do given the pixel density, you’ll see color changes at the sides of the screen, even if you are positioned dead-center. Pulling back to 36 inches resolves those anomalies. Obviously, there is a major shift to red at the sides and a loss of detail in the vertical plane.

Screen Uniformity: Luminance

To measure screen uniformity, zero and 100-percent full-field patterns are used, and nine points are sampled. First, we establish a baseline measurement at the center of each screen. Then the surrounding eight points are measured. Their values get expressed as a percentage of the baseline, either above or below. This number gets averaged. It is important to remember that we only test the review sample each vendor sends us. Other examples of the same monitor can measure differently.

First up is black field uniformity.

We can see minor hotspots at the center and upper-right portions of the screen in the black field pattern. In actual content, even dark material, we saw no issues.

Our white field pattern looks perfect to the naked eye. A 10.37-percent result is right on the borderline of visibility. Our measurements tell us there’s a dim area in the upper-left corner.

Screen Uniformity: Color

To measure color uniformity, we display an 80-percent white field and measure the Delta E error of the same nine points on the screen. Then we subtract the lowest value from the highest to arrive at the result. A smaller number means a display is more uniform. Any value below three translates to a variation that you shouldn't be able to see on your own.

A 1.42 Delta E figure is excellent. In fact, it's the best of all 4K screens we've tested. Like the white field uniformity test, we couldn’t see any problems with our press sample. Of this group, only Dell's UP3214Q has any visible color uniformity issues.

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  • 0 Hide
    petar , September 1, 2014 10:59 AM
    - We need to see Article comparing IGZO - PLS - AHVA panels at first place.

    - What happened with AHVA panels M270QAN01.0 , M270QAN01.1 , M320QAN01.0 ,M320QAN01.1 from AUO that were planed for 2014 production ? We are in September 2014 now and no one offers them.

    It would be good to know who uses which panel, we have ASUS, Iiyama, AOC, DELL, Viewsonic, Samsung selling 4K displays all based on TN...
  • 0 Hide
    JJussi , September 3, 2014 11:16 PM
    I would like to see compare to AOC U2868PQU 4K display.

    There is not so many "cheap" 4K monitors on market and I would like to choose best for myself...

    What I know, there is two other products too:
    Philips Brilliance 288P
    Samsung U28D590D