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U3818DW, banding
The 38-inch ultrawide has a problem with banding when things are moving. There are a few other 38-inch monitors out that use this same LG AH-IPS panel. Static images of gradients of all kinds look very smooth. However if you watch a video or have a gradient that moves at all, there is noticeable banding.
Here is a little thing to test moving gradients on your display: http://jsfiddle.net/mvj3ds19/1/
Static gradient vs moving with banding: https://fat.gfycat.com/VerifiablePerfectGrosbeak.webm
There's also this video I found of what happens if you dare change the response time to 5ms
My 34-inch ultrawide doesn't do either of these things, which makes me think this LG panel is a lemon haha
DELL-Chris M
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September 5th, 2017 07:00
You should be testing the U3818DW after resetting to Factory settings, (OSD Menu -Other -Factory Reset), 3840x1600 60Hz, page 45 in the User's Guide. Post a video of the U3818DW within windows playing a game. Is your video card driver sending 10 bit or 8 bit? If 10, can you force it to 8 and retest?
We also need more data =
* Was the U3818DW purchased directly from Dell or some reseller? And when?
* What is the 20 digit alpha-numeric U3818DW serial number and A0x revision?
* To what computer model is the U3818DW attached?
* Have you tested on a second computer? If so, what are its specifications?
* What operating system is installed on the computer?
* What video card/GPU is installed in the computer?
* What video OUT ports are on the video card/GPU?
* List all U3818DW cables and adapters attached to the computer and the ports they are using and how they are connecting to the U3818DW
tmikaeld
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January 3rd, 2018 13:00
I have the exact same problem.
Tested with Win10 and MacOS High Sierra - both 64-bit and tried with both Nvidia, Intel.
Also tried with forced 10-bit and 8-bit, did a factory reset and tried with HDMI and DP.
It's not the first person to have this issue either, but Dell just keeps claiming it's "supposed" to be like this.
The issue happens if contrast is over 51% and it becomes much worse if setting response time to "fast" (5ms). The video below are on "normal".
Video: https://youtu.be/MHX9rYdhqRE