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Dell S2716DG 1440 144 Hz G-Sync Owners Thread - Page 5

post #41 of 5323
EDIT: This is apparently an AUO panel issue that occurs on all high-refresh monitors that use it. It's not something to worry about as it only ever appears in the inversion test patterns below. I'm keeping the list of items below in case people want to identify that it's occurring in their monitors, but again, it doesn't show up outside of these test patterns.

Uh oh, bad news guys. When trying the inversion test pages http://www.lagom.nl/lcd-test/inversion.php#invpattern, all the fine grained patterns are wreaking havoc with the monitor. In particular, #4 is really bad.

It looks like the panel design has each horizontal row of pixels tied together, so when I fill the left half of the screen with the inversion pattern, it causes the inversion pattern to affect the right half. Vertical pixels above/below the pattern do not seem affected. Below are some images of what I'm talking about.

Inversion pattern on left, solid Photoshop window on right:


Zoomed in, you can see the Photoshop window has major artifacts, almost like the inversion pattern is being overlaid:


Here is what it looks like over black text on a white background:


One weird thing is that when the inversion pattern/text is maybe 80%/20% of the monitor things look fine:


But then when I shrink the inversion pattern a few pixels in width, the artifacting shows up again:


Also, the size of the inversion pattern on screen affects how visible it is. Here is a YouTube video illustrating the effect of shrinking the inversion pattern by sliding a gray Photoshop window over it. You will see that as the inversion pattern becomes covered by the Photoshop window, its effects are diminished:
https://www.youtube.com/watch?v=SzCOaqLo0jU

For the other owners in this thread, I'd definitely like to know if you're experiencing the same issue with these test patterns. This occurs on any refresh rate (60, 144 Hz), as well as G-Sync on/off. Adjusting contrast sometimes reduces the appearance of it, but it is definitely still there.

Looks like Dell is not immune to the QC problems apparent with the PG278Q. Definitely going to have to get this thing replaced.
Edited by abcsoup - 10/22/15 at 9:25am
post #42 of 5323
I tried the test on my s2716dg and I got the exact same results you did. Help me understand why one might make to decision to send the monitor back, or rather why is this an issue?

I would never have known this "problem" existed had I not done this test. Perhaps these questions are sort of newbish on my part but when would I encounter this banding or visible line issue outside of a test like this?

I totally understand as an individual customer we all must decide on our own (especially for the amount of $ we've spent) whether we are satisfied with a product. Although I haven't spent days with this monitor yet, I have been playing games and doing general internet browsing on it without encountering the phenomenon described above.

Do you think this is an issue that is inherent in this model, or that this is indeed a defect and that Dell would be able to send you a corrected model?

Also when you call them and have this thing replaced, how best to describe the nature of this "defect"

Thank you for the education and the testing you have done

edit. In briefly searching through and comparing the complaints from PG27Q8 owners their "strain" of pixel inversion dissease (for lack of a better term) is different, in that their monitors seem to show "flickering" or "glitching" along the horizontal and vertical axis all the way across the screen, which in some screenshots they submit as examples looks more pronounced, more frequent, and therefore more annoying and evident than what I seem to have "induced" with this test.

https://i.gyazo.com/ff54f6a888ded6aac5472ac3d480ffba.jpg

edit #2 - In the above link is an example from one PG27Q8 owner who provides a link to this image which clearly shows strange patterns in the blue color of the sky, I don't believe our type of pixel inversion issue (not that it doesnt exist) is anywhere near as bad.

moot
Edited by mootpoint - 10/21/15 at 10:36pm
post #43 of 5323
Quote:
Originally Posted by mootpoint View Post

I tried the test on my s2716dg and I got the exact same results you did.

Thanks for testing, moot. You're definitely right in that with regular use, I haven't come across a time when this issue has actually reared its head, either in desktop applications or in-game. It's only with these test patterns that it appears. My concern was really that it could be indicative of a more serious problem with the monitor. Now that you've confirmed that it also appears on your sample, I'm leaning toward this being less of a variation in manufacturing and instead a possible design flaw. To rule out everything, I have an Accell DisplayPort cable that should arrive tomorrow, and I will see if that changes any results. I am also hoping that the PG279Q IPS panel is released in the US within the return period for this monitor so that I can do a comparison and return the one I like least.

On another note, one other test I ran was here: http://www.lagom.nl/lcd-test/sharpness.php

If I drag the browser window around the screen, I can see movements cause the screen to show light red/green. It seems to indicate that pixel switching times between the various red/green colors are different for on=>off and off=>on, so I can see the lingering red/green colors in the test pattern. When looking hard for it in-game, I can occasionally see it when viewing the borders of thin, swaying foliage like grasses in the Witcher 3, and in some textures in CS:GO. I believe it's something that's inherent with all samples of the PG278Q panel as well, and it honestly doesn't really bother me. It's useful to note, however, since I know others can be sensitive to it. Given this performance, I'm betting that the Dell and ASUS are both using the same TN panel.
post #44 of 5323
Quote:
Originally Posted by abcsoup View Post

Thanks for testing, moot. You're definitely right in that with regular use, I haven't come across a time when this issue has actually reared its head, either in desktop applications or in-game. It's only with these test patterns that it appears. .
Quote:
Originally Posted by mootpoint View Post

I would never have known this "problem" existed had I not done this test. Perhaps these questions are sort of newbish on my part but when would I encounter this banding or visible line issue outside of a test like this?

It wont EVER turn up outside of these test images, move on guys.
Quite a lot of monitors have some of the inversion patterns extending outside of the window, no matter the brand or panel type.
post #45 of 5323
Quote:
Originally Posted by abcsoup View Post

Given this performance, I'm betting that the Dell and ASUS are both using the same TN panel.

That is actually a good thing because the TN of PG278Q is high quality panel in terms of color reproduction, but it's bad that it also has pixel inversion. Some users of the PG278Q said that if you lower the brightness below 50 (at least I think it was the brightness, but you better check the PG278Q thread just to be sure) the pixel inversion goes away. You can try and see if it's the same with S2716DG.
post #46 of 5323
Quote:
Originally Posted by abcsoup View Post

Given this performance, I'm betting that the Dell and ASUS are both using the same TN panel.

Last time I checked, there is indeed only one 2560 x 1440 144 Hz TN panel (it's from AUO of course), and it's used in the PG278Q, this Dell, the BenQ XL2730Z, Acer XG270HU, and the TN version of the XB270HU.
 
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post #47 of 5323
The BenQ BL3200PT has the same inversion issue.as does the XL2420Z. I do not think I saw it on older screens. I think it is just how they are setup now days.

The only time I could see it as an issue would be old 8 bit games that use pattern dither to get colors the game could not display(but again what 8 bit game uses the resolution of one of these screens). With the push for "retro" type games, you may see if if they choose to use these dithered colors.
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post #48 of 5323
Quote:
Originally Posted by boredgunner View Post

Last time I checked, there is indeed only one 2560 x 1440 144 Hz TN panel (it's from AUO of course), and it's used in the PG278Q, this Dell, the BenQ XL2730Z, Acer XG270HU, and the TN version of the XB270HU.

"The Acer XG270HU features an AU Optronics M270DTN01.3 TN Film technology panel.The panel part is confirmed when dismantling the screen as shown below. It should be noted that this is a slightly different revision to the panel used in the BenQ XL2730Z (M270DTN01.0), and different to that in the popular Asus ROG Swift PG278Q (M270Q002 V0) despite the similar specs of the screens."

source TFTcentral - http://www.tftcentral.co.uk/reviews/acer_xg270hu.htm
post #49 of 5323
Quote:
Originally Posted by medgart View Post

"The Acer XG270HU features an AU Optronics M270DTN01.3 TN Film technology panel.The panel part is confirmed when dismantling the screen as shown below. It should be noted that this is a slightly different revision to the panel used in the BenQ XL2730Z (M270DTN01.0), and different to that in the popular Asus ROG Swift PG278Q (M270Q002 V0) despite the similar specs of the screens."

source TFTcentral - http://www.tftcentral.co.uk/reviews/acer_xg270hu.htm

Ah, my mistake. Different versions. All are from AUO though, and seem to exhibit basically identical performance according to those who have used them.
 
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post #50 of 5323
I'm all worried now about this pixel inversion issue and I don't even quite know what it is, my monitor arrives tomorrow. Is this potentially a problem worth not keeping the monitor for?
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