LG 34UM67: UltraWide FreeSync Review
by Jarred Walton on March 31, 2015 3:00 PM ESTLG 34UM67 Display Uniformity
Given the size of the display, creating good uniformity can be difficult. Most of the display does reasonably well, with the corners tending to vary a bit more the center. The left side of our sample in particular looks a bit dim, but it’s only something you really notice when you look for it.
Starting with white uniformity, the center ends up being close to the brightest area, when most other sectors dropping off slightly. The center portion along with the bottom are all within 10%, which is a good result, but the top left and right corners fall off by up to 15%. Professionals would appreciate better uniformity overall, but for gaming the LG 34UM67 works well.
Black uniformity interestingly is a bit of a reverse from the white, with many areas showing slightly higher black levels than the center. However, our i1 Pro is not the best device for measuring black levels and the actual difference between 0.315 cd/m2 and 0.387 cd/m2 isn’t all the great when looking with your physical eyes, even though it’s a 23% difference. There’s a lot of variability in the charts, but mostly the corners seem to be the biggest outliers.
Compared to our earlier calibrated results, or uniformity contrast measurements have all fallen off quite a bit. Our measured contrast this time ranges from 465:1 on the bottom-right corner to as high as 662:1 just above the center, but I think most of the black levels were measured too high so the contrast results are only moderately useful.
Delta E shows similar uniformity again. The top-left edge and top-right seem to have the greatest variance, but for a non-professional display most of this discussion is academic.
The short summary is that uniformity on the LG 34UM67 is good but not exceptional. There will obviously be differences between panels, so where we had problems primarily on the corners and left/right edges, other displays may show more or less issues. Perhaps the most telling aspect is that prior to testing uniformity, I looked carefully over the display with a variety of solid background images to see if I could detect any problems. There are some very minor discolorations that show up primarily when viewing pure white, but the size of the display makes the corners more of an acute viewing angle so it often feels like that’s as big of a problem as display uniformity.
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FXi - Monday, May 25, 2015 - link
It would have been helpful to list in the article what the "consistent" constrast ratio was. I'd be guessing it was more likt 750/800:1 given IPS performance in the past but while low and high are very useful, knowing where someone will likely land being somewhere in the middle of the road would be useful to readers. Only making a suggestion. I am always grateful for the things you DO include in your reviews and I read them pretty through and through.KarenS - Friday, July 24, 2015 - link
There are no VESA mounting holes on this monitor. Could you verify that you reviewed the correct one? I bought a "34UM67" and did not find any VESA mounting holes. The pictures on your site shows no mounting holes either.Jiffybag - Sunday, October 11, 2015 - link
How did he flatten the game curve when the monitor has no gamma controls? I bought this monitor and my gamma looks exactly like his pre calibration gamma image (starting high ending low) but as thre is NO way to calibrate gamma (only colour / white balance) I was unable to correct it? Anyone care to explain? Jarred?Jiffybag - Sunday, October 11, 2015 - link
Game = gamma (auto correct got me) :)My settings:
Backlight set to 20 (120cd/m2)
Black adjuster set to 0
Using i1Display Pro
Power savings etc all turned off
Colour calibration is good (all under delta 1.6)
Colour temp is spot on 6500k
Grey scale delta error all less than 1
Gamma set to "1" in menu
Gamma average is 2.2 BUT it's a diagonal line \ starting high (at 2.4) and ending at 1.9.
As there is no 10point gamma control I am unable to figure out how to flatten the gamma as there is no gamma controls? My HDTV has 10pt gamma control so I can raise 10/20/30 and lower 70/80/90 to flatten a curve, but this monitor has absolutely NO (ZERO) gamma controls so how on earth can he flatten it to such a decent flat line? I'm baffled? Unless he used the dynamic contrast adjuster (black level adjuster) and/or used his GFX card to make adjustments to his output, I'm unsure how he was able to do this. I'd love to know though if anyone can enlighten me :)
Jiffybag - Sunday, October 11, 2015 - link
I have a 34UM67 and it has VESA mounting holes, but no gamma correction control? :-/rya - Monday, October 19, 2015 - link
has anyone tried overclocking this monitor or altering the freesync range? I'd love to run freesync from 9hz - 80hz (or higher) if possible.