The more monitors we test, the more we can see that off-axis viewing performance is dependent not only on pixel structure (IPS, PLS, TN, etc.) but the backlight technology as well. And we can see that the anti-glare layer makes a difference too.
When a monitor is as wide as the 34UM95, off-axis performance needs to be top-notch, and it is. These are the best horizontal viewing photos we’ve ever seen. Aside from a little light reduction, the gray step pattern looks the same from a 45-degree angle as it does head-on. Meanwhile, in the vertical plane, there is a red shift along with lower brightness and a loss of detail in the darker steps. Still, I'd say this represents a step forward for IPS panels in general.
Screen Uniformity: Luminance
To measure screen uniformity, zero and 100-percent full-field patterns are used, and nine points are sampled. First, we establish a baseline measurement at the center of each monitor. Then the surrounding eight points are measured. Their values get expressed as a percentage of the baseline, either above or below. This number gets averaged. It is important to remember that we only test the review sample each vendor sends us. Other examples of the same monitor can measure differently in this metric.
First up is black field uniformity.

In excess of 20 percent isn't the worst result we've recorded, but it is higher than almost every other monitor we've tested. The culprit is along the bottom edge, where hotspots are fairly easy to see. There are also light areas at the top edge. Obviously, that is where the backlight LEDs are located.
Here’s the white field measurement:

Fortunately, the above result doesn’t translate to the white field measurement. In fact, as brightness increases, the screen appears more and more uniform.
Even though these tests show a weak point in the 34UM95, it doesn’t diminish other areas where the display performs well. Overall image quality is still very good.
Screen Uniformity: Color
To measure color uniformity, we display an 80-percent white field and measure the Delta E error of the same nine points. Then we simply subtract the lowest value from the highest to come up with a result. Smaller numbers mean a display is more uniform. Any value below three means a variation that is invisible to the naked eye.

Almost all of the monitors we measure have no visible color shift across the screen; LG's 34UM95 is no exception. In fact, only the bottom-right corner shows any significant difference in color accuracy. Even that error wasn't visible to me.
- LG 34UM95 34-Inch Ultra-Wide QHD Monitor Review
- Packaging, Physical Layout, And Accessories
- OSD Setup And Calibration Of The LG 34UM95
- Measurement And Calibration Methodology: How We Test
- Results: Brightness And Contrast
- Results: Grayscale Tracking And Gamma Response
- Results: Color Gamut And Performance
- Results: Viewing Angles And Uniformity
- Results: Pixel Response, Input Lag, And Usability
- LG 34UM95: Solid Performance And Real Usability

Playing on "full" hd (LD? Low definition) feels like a joke once you get to know uhd/4k
With regards to this monitor...I LOVE the looks...very elegant. I think the price tag is fitting as well - it has great resolution and there are still plenty of people who are gaming on 60hz displays that may have just enough GPU power to actually game at this thing's native resolution, albeit with slightly lower settings. GG LG!
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It would have been nice to include what revision this is, because LG is aware of uniformity issues, which is why the product was largely on backorder and a Rev.2 is in place (but Rev. 2 didn't fix the problem either). My first one had a glaring Uniformity problem, but LG is cool and offered an advanced exchange. The new one has some uniformity problem, but it is very 'livable' and discrete.
Overall, I am pleased with this product. I have a single 780 to push this and it works nicely. If I got a 4k monitor, I'd have performance issues as the GPU as a whole sector is behind.
seriously though, pc monitors have been lacking for some years now, falling behind in innovation and technology in general(phones have been jacking up their screen quality year after year, we've been stuck since like 2005). i bet 21:9 screens will have the biggest penetration on PCs.
This is simply a horrible aspect ratio for most people.
The problem is that if you can see the entire monitor without moving your head then 16:9 is the proper ratio to maximize viewing area such as 3840x2160.
Ultrawide really only makes sense if it's WIDER than what you can see without moving your head. For that, I'd rather have more than one monitor.
Ultrawide for gaming makes little sense. Screens need to be curved, or have multiple angled monitors with minimal gap but a single super-wide screen just doesn't work.
*If you really think about it, it's hard to justify the 21:9 ratio.
This is simply a horrible aspect ratio for most people.
The problem is that if you can see the entire monitor without moving your head then 16:9 is the proper ratio to maximize viewing area such as 3840x2160.
Ultrawide really only makes sense if it's WIDER than what you can see without moving your head. For that, I'd rather have more than one monitor.
Ultrawide for gaming makes little sense. Screens need to be curved, or have multiple angled monitors with minimal gap but a single super-wide screen just doesn't work.
*If you really think about it, it's hard to justify the 21:9 ratio.
Don't knock it, if you haven't tried it. Seen the demos of this screen with 21:9, it's quite impressive looking, compared to the other ratios out there. At the very least, it's more compelling than given credit for.
Impressive LOOKING and impressive FUNCTIONALITY are two different things
That's what I'm thinking. It seems like the wider the screen resolution the more perceivable tearing is. G-sync would help this situation. Acer is supposed to be releasing a 4K G-sync monitor in the next 6 months or so:
http://www.geforce.com/whats-new/articles/nvidia-g-sync-monitors-unveiled-shipping-soon-worldwide
Granted the 34" will have its uses and applications, but from the UWHD I don't think it will be the most sold. the 27" might be too small, but 29" is perfect for 2650x1080. BTW, I do game in this monitor too, and I work on it TOO