Test results brightness and contrast
We compared the AOC U2879VF with 10 other 28-inch ultra hd-monitors. We primarily tested it out-of-the-box and compared it in that way with the other models in this article. However, we also tested it using our new test method. In the graphs on this page and the next the U2879VF can be recognized by the red bar.
The maximum brightness is important for being able to use a display in bright environments. We measure this in candela per square metre (cd/m²), which was previously also referred to as "nit". The rule of thumb is that 200 candelas per square metre is sufficient. For office environments the threshold usually is 250 cd/m².
The maximum brightness of the AOC U2879VF is more than adequate at 277 cd/m²; with this it ends up in the middle of the graph.
The minimum brightness is a good indication for how rich in contrast a display is. After all, a decrease in minimum brightness has more influence on the contrast ratio than an even larger increase in maximum brightness. Since TFT panels always feature a light source, achieving a brightness of 0 cm/m2 is almost impossible. Only VA screens are able to get close to that.
We measure a minimum brightness of 0.34 cd/m², certainly not a bad result for a TN-panel.
Brightness uniformity indicates how evenly a display is illuminated. We divide the screen into a number of zones and measure the brightness. The reported value is the brightness of the least bright area as a percentage of the brightest area. Values above 75 percent are acceptable, more than 80 percent is "good" and over 85 percent is very good.
The backlight of the UV2879VF is pretty good with 81%.
Here the AOC U2879VF performs reasonable with a contrast of 815:1, comparable with most of the competitors.
New test method results
Of course it is interesting to take a look at the results of the new test method. You can find all of them on the page with the test results of the product, here we take a look at the results that are relevant for this part of the review.
We do most of the new measurements at a brightness of 150 cd/m², which is representative for the required brightness in a regular environment. We measured a black value of 0.19 cd/m² and a contrast of 801:1. We also look at the minimum brightness of white, which is 39.7 cd/m².
At a brightness of 150 cd/m² the uniformity is slightly better than with the maximum brightness, we measure an 84% brightness for the least bright part in comparison with the brightest part. The black uniformity is reasonable; the differences in absolute values are not that big (0.15 cd/m² to 0.2 cd/m²), but still quite variable per measured part of the screen.
Below you can find the different uniformity measurements. From left to right: uniformity black, uniformity white, contrast, colour temperature, colour deviation at 150 cd/m² white.