Author Topic: LG 27UL550 Review: Matte 3840x2160 LG AH-IPS with AMD Free-Sync  (Read 10676 times)


  • Administrator
  • Hero Member
  • *****
  • Posts: 761
    • View Profile
Calibrated Image Quality

DSC_0045 by Dr NCX, on Flickr

LG 27UL550 Calibrated Chart by Dr NCX, on Flickr

In Canada where I live the LG 27UL550 sells for 400-520$ Canadian while the 4K AH-IPS panel in my ViewSonic VP2780-4K sells for at least 700$ CAD.  The LG has preset gamma which targets linear 2.2 for the HDTV/REC 709 color standard while the VP2780-4K targets the sRGB standard which has a different, non-linear gamma curve.  The ViewSonic's AH-IPS panel based on 2015 technology is more accurate since it does not over-saturate color like the LG, and because the VP2780-4K suffers from less banding regardless of which image standard it is calibrated to since it has a properly functioning 14 bit 3D Look Up Table.  The LG is suffers from significantly less IPS glow (when viewed properly) which makes it superior for gaming and media viewing, assuming one does not need to do so professionally with high tier accuracy and no over-saturation.  The 27UL550's color over-saturation is quite obvious when viewing content with lots of grey such as this Metro Exodus wall paper, though this type of over-saturation is to be expected from for non-professionally oriented monitors, as well as preferable to under-saturation since operating systems and programs which support color management (CMS) can be used to reign in the over-saturation.

LG 27UL550 versus ViewSonic VP2780-4K Color Gamut Comparison
Spoiler (hover to show)

The 27UL550 offers excellent calibrated image quality for the price, especially when considering the fact that is suffers from less glow than older and more expensive 4K AH-IPS panels.  There are slightly better 4K AUO AHVA panels with less glow in monitors the BenQ PD3200U, Monoprice RTD2795 and essentially warranty-less Qnix UHD3216R, but they either cost significantly more and have grainier or sparklier matte coatings (BenQ), or lack proper warranties and can not be easily exchanged and returned (Qnix).

« Last Edit: June 20, 2019, 02:41:09 am by NCX »