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To compare the MO27Q28G’s performance, I’ve charted five other 27-inch QHD OLEDs with 240 and 280 Hz refresh rates. They are Aorus’ FO27Q2, Alienware’s AW2725D, Asus’ XG27AQWMG, AOC’s Q27G4ZD, and ViewSonic’s XG272-2K.
Pixel Response and Input Lag
Click here to read up on our pixel response and input lag testing procedures.
Starting with my review of the Asus PG32UCDM3, I’ve turned to Nvidia’s LDAT photosensor and software to measure the panel's response and input lag (latency). Since I’ve measured only two monitors with this tool, the response chart shows only two screens. The MO27Q28G transitions from black to white in 0.16ms for a one-inch square. The PG32UCDM3 is a tad slower at 0.24ms. As I add more screens to this test data, I’ll be able to note trends and whether response goes hand in hand with refresh rate.
In the lag test, the MO27Q28G proved very quick with a 14ms average over 25 clicks. The button on the LDAT mimics a mouse input. This is one of the lowest lag times I’ve recorded across all monitors and refresh rates. The current record is 10ms, co-held by the Philips 27M2N8500 (360 Hz) and LG’s 27GX790A (480 Hz). Gigabyte isn’t too far behind, and it manages the feat with only 280 Hz, which is impressive.
Test Takeaway: The MO27Q28G is super quick with panel response, providing visually perfect motion resolution and instant response to control inputs. It is a competitor’s weapon that is fully qualified for pros and casual gamers alike. It provides the smooth operation you’d expect from any premium OLED and delivers top performance for a relatively low $600.
Viewing Angles
One of the advantages of Tandem OLED is that it doesn't have the polarizing effect of a QD layer, but those stacked emitters still cause a barely visible green tint at 45 degrees to the sides. You won’t see an issue in actual content; the grayscale step pattern constitutes a torture test. There is no change to gamma or brightness. From the top, you can see a little red and reduced gamma.
Screen Uniformity
To learn how we measure screen uniformity, click here.
I’ve seen great uniformity results from all the OLEDs I’ve reviewed, so the MO27Q28G’s last-place finish is by no means a negative. 7.49% is still well below the visible level of 10%. There was no apparent glow or hot spotting in my review sample. This is excellent performance.
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