Review of the ASUS PQ321 Ultra HD 4K 31.5-inch Monitor. Boasting a 3840x2160 display resolution, this 4K display floods your eyeballs without four times as many pixels as that of a standard Full HD 1080p 1920x1080 display. To squeeze that many pixels into a 31.5-inch form factor, the PQ321 uses what's called Indium Gallium Zinc Oxide IGZO rather than traditional amorphous silicon for the active layer of its LCD panel.
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