Alphascan 4077 UHD (3840x2160 ) Monitor, (YCbCr 4:4:4, 10Bit),DP, HDMI 2.0, HDCP 2.2, Low Blue Light, Flicker Free, MHL, 178/178, PIP/PBP, Remote Perfect Pixel

Used for: development, not for games + connected to laptop that supports frequency 30Hz only (monitor should support up to 60Hz).All further results for 3840 x 2160 x 30p Hz. Checked on both: DisplayPort and HDMI output.Flicker on all modes except: * Brightness -> 100% + (a) user mode OR (b) Scenery.As far as it is too bright usually but for User mode it is possible to adjust each color => brightness lower but no flicker.Note: Blue reduction should always be off, as flicker on any level of Blue reduction (except off).How flicker checked: using iPad - search on youtube for details (e.g. "Monitor Flicker Test")+ compared with 2 other monitors (one has flicker, another does not have)In spite of flicker - score 5 - as zero dead pixels, good price, English menu available, and it is still possible to adjust monitor to avoid flicker.