Feel like I'm going crazy but I can see the pixels on my monitor!

[diyaz]

Just bought a CF791. It's a 34" ultrawide 1440p VA panel. After using it for a week I've noticed that in grays and light colors I can see horizontal rows of pixels with some haze of colors in between like a screen door effect. I am not sitting with my eyes against the monitor, I am about 2-3 feet back. I notice it primarily in the left lower corner the easiest. I am coming from a 1080p 34" ultrawide and I couldn't see the pixels so I'm confused why I can now. Is this a side-effect of VA panels and their deep contrasts?

Only thing that seemed similar was this guy's post many years back. Here's another thread with same description of the problem.

This is best picture I could get, but I can see that grid pattern (it's more horizontal rows of pixels, I think camera and curvature of screen is warping the grids) sitting 2-3 feet back when I am focusing on text. If I am not focused on an area I don't see it so it's really subtle unless you stare at it.

 

[Tweak155]

Although it is not entirely in the picture, why does it show 2560 as the first part of your resolution if it is a 1440p ultrawide? Shouldn't it be 3440?

That said, the text looks pretty clear so I doubt it's the wrong setting, but it might be. My other though is that it could be the anti glare coating.

Unfortunately I've had panels like that where I could see the rows and or columns like that... I had to sell it off and get a different screen (although my experience with this is on laptops).

 

[diyaz]

thanks for your input. yea I was changing the resolution around to see if a lower resolution made it more apparent but id made no difference.

I think I was doing more reading and people describe this as horizontal scanlines and it's usually seen with Gsync monitors? It's not really scanlines in the sense of the old TV days but I can see the separate rows of pixels. It is just strange as it is not a reported defect of monitors and may be just intrinsic characteristic of the panel.

 

[Malogeek]

From the edge of the screenshot, it looks like it's running at 50hz? It's a 100Hz panel.

 

[diyaz]

yea but HDMI 1.4 limits it to 1440p @ 50hz and DP it's limited to 60hz. Maybe that is my problem?

 

[Malogeek]

yea but HDMI 1.4 limits it to 1440p @ 50hz and DP it's limited to 60hz. Maybe that is my problem?

It's possible, your description sounds like a scanline problem, though I'd usually associate that with CRTs.

What is your GPU? I believe you need DP 1.3 to drive it above 60Hz.

 

[diyaz]

It's possible, your description sounds like a scanline problem, though I'd usually associate that with CRTs.

What is your GPU? I believe you need DP 1.3 to drive it above 60Hz.

I am running a Dell XPS15 9550 connected to a WD15 dock. It is a GTX 960m. I have tried with and without dock with HDMI. DP only with dock as I don't have DP connector on the laptop, only through USB-C dock.

That is strange because the monitor I think only supports DP 1.1 or 1.2 when I was looking at the OSD those were the only two I could select. It's suppose to be 100hz native. I have it set to "fastest" response time in the OSD setting.

 

[diyaz]

Found another similar thread. I find these threads and I never find out if the OP resolves his problem from an RMA. Seems like most people move on to a different monitor.

 

[Malogeek]

Well it looks like 100Hz isn't supported via DP because the monitor only has DP 1.2. In order to achieve the 100Hz refresh rate, you would need to use the HDMI 2.0 port and have that support on your PC as well, which you don't.

 

[diyaz]

I think 1.2 does support 100hz. Must be the Intel onboard graphics that does not? But I wonder if refresh rate would make a difference for this matter.

 

[Malogeek]

edit: nevermind you tried without dock and HDMI.

Not sure sorry, the specs on the laptop are quite high and should support it.

 

[diyaz]

edit: nevermind you tried without dock and HDMI.

Not sure sorry, the specs on the laptop are quite high and should support it.

yea I did and sadly it did not make a difference. I also tried it on my wife's Lenovo. Both with HDMI.