Author Topic: LG 27UL550 Review: Matte 3840x2160 LG AH-IPS with AMD Free-Sync  (Read 6938 times)


  • Administrator
  • Hero Member
  • *****
  • Posts: 758
    • View Profile
Perceived Black Depth

DSC_0016 by Dr NCX, on Flickr

The photo above is of the LG used with bias lighting (3x LIFX BX30 lights @3500k) or lights behind placed the display which output over 3000 lumens at 100% percent brightness.  When not used in a light-less room the perceived black depth offered by the 27UL550 is superior to the majority of 27" 1440p and 4K monitors with AHVA/IPS/PLS panels since the 27UL550 has a dark matte grey bezel while most use fake bezel or frame-less casings which reduce the perceived black depth since they have inner black bezel's: photo of the LG 27UK650 from the review by =DEAD=:

The 27UL550 has average contrast (900:1 after calibration) or black depth for a non-VA panel, but black looks darker next to the sparkly matte grey bezel versus the inner black bezels of fake bezel or frame-less monitors.  When the lights are off the matte grey bezels' perceptual improvements vanish since the dark matte grey bezel plastic looks black in a light-less and very dimly lit rooms.  The silver bezel of the Qnix UHD32R and white bezel the Acer EB321HQ Awi appear distinctly non-black even in a light-less room, though silver barely makes a perceptual difference compared to white which always vastly improves the perceived black depth.

The 27UL550's matte grey bezel does not vastly improve the perceived black depth, especially in dimly lit rooms, but it does enough to make it a worthwhile feature display buyers should always opt for if equivalent displays with brighter grey, silver or white bezels are not an option.

Acer XB321HK AHVA Panel with 800:1 Contrast
Spoiler (hover to show)

HP Spectre 32 AHVA Panel with 700:1 Contrast
Spoiler (hover to show)

LG 27UL550 LG AH-IPS Panel with 900:1 Contrast
Spoiler (hover to show)

Qnix UHD3216R AHVA Panel with 1100:1 Contrast
Spoiler (hover to show)

ViewSonic VP2780-4K LG AH-IPS Panel with 1000:1 Contrast
Spoiler (hover to show)
« Last Edit: June 20, 2019, 02:49:36 am by NCX »