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Monitor manufacturers may be putting 4K UHD (3840 × 2160) panels in some 1440p QHD (2560 × 1440) monitors. This can cause blurriness since one pixel would be mapped onto one and a half pixels:
Citing sources close to panel manufacturers, German website Prad.de writes that the costs of producing a 27-inch 4K 3840 x 2160 panel is often lower, or at least the same price as, creating a 27-inch 2560 x 1440 QHD panel. As such, some companies have reportedly been producing monitors that use 4K panels despite being advertised as 1440p. This is said to happen often when panel supplies are low, or monitor demand is high.
[...] Prad.de included a simulated monitor test image in its report (below). It shows native 1440p on the top and 1440p scaled to 4K on the bottom.
Also at TechPowerUp.
(Score: 2) by RS3 on Monday June 25 2018, @04:27PM
100% agree, and I thought that was obvious. My post was just to say that I thought the pixel-mismatch blurring problem was common knowledge for a very long time.
Also obvious, to me, is that the monitor manufacturer is either completely ignorant of this and somehow didn't notice the blurring in their own QC, if they do any, or thinks their customers won't notice the blurring. Bad news travels very fast.