OLED Screen Uniformity Discussion-Banding and Vignetting - Page 254 - AVS Forum | Home Theater Discussions And Reviews
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post #7591 of 7827 Old 08-31-2019, 08:22 PM
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OLED Screen Uniformity Discussion-Banding and Vignetting

FYI here was 10% and 5% before the refresh. 5% didn’t even register in my iPhone camera





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post #7592 of 7827 Old 08-31-2019, 11:11 PM
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The worst torture test for vertical banding for OLED; fire up The Blair Witch game on Xbox.
Play until it's night time in the game:

The HORROR, literally!
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Last edited by LorHan; 09-01-2019 at 12:07 AM.
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post #7593 of 7827 Old 09-01-2019, 01:56 AM
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Quote:
Originally Posted by LorHan View Post

The HORROR, literally!
The worst torture test is 5% grey slide. You'll see all uniformity issuies on your panel.
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post #7594 of 7827 Old 09-01-2019, 03:30 AM
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Quote:
Originally Posted by Dimon.Zorg View Post
The worst torture test is 5% grey slide. You'll see all uniformity issuies on your panel.
Nope.

I have almost none on 5% on my Sony AF9, at least not visible in a totally dark room.

Slides don't move.

If you can try the game it's horrendous when the night falls, since you can move the camera as you like, the panning is the WORST!
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post #7595 of 7827 Old 09-01-2019, 05:41 AM - Thread Starter
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Quote:
Originally Posted by b_rad4 View Post
After so much trouble with tinting and 5% on the 3 65s I bought a 55C9. White uniformity was great but 5% was completely black but a little light in one corner. And 10% was half black. After a pixel refresh 10% is great and 5% is very good. A little brighter in the top right but that doesn’t bother me at all after the garbage I seen on the first 3. There is no real bands. There is only 2 hours and 1 manual refresh on this one.

I’m so relieved I finally got a great one after 3 duds
Little disappointed it’s a 55 but I am happy to have a uniform set

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Good news and congrats for snagging one!

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post #7596 of 7827 Old 09-01-2019, 08:39 AM
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Quote:
Originally Posted by LorHan View Post
The worst torture test for vertical banding for OLED; fire up The Blair Witch game on Xbox.
Play until it's night time in the game:

The HORROR, literally!

Is it worse than 'Little Nightmares'? I thought of that game to be the worst one so far...


And you're right, a moving picture can make vertical banding much more noticeable than a static grayscale slide...
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post #7597 of 7827 Old 09-01-2019, 08:51 AM
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Yes it's a lot worse then Little Nightmares.

A real horror vertical banding show.
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Last edited by LorHan; 09-01-2019 at 09:07 AM.
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post #7598 of 7827 Old 09-01-2019, 10:28 AM
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I think this thread might be the best place to ask this question. There really isn't a closer thread that deals with LG and Panel uniformity.

Does anyone have any experiences they can share with LGs panel replacement process under warranty? Just wonder what it was like if I called and opened a ticket on white tint uniformity, then what I could expect from them? Do they send a tech to your home for the replacement? What happens if the replacement has uniformity issues as well? It seems like people are going through 3 replacement screens before they are getting one that has no tinting or banding issues. If LG sends a panel with a stuck or dead pixel, would they swap it out for that being an issue?

I really appreciate some feed back, as this is going to be quite a rabbit hole to go down with the TV. I want to make sure that I do not get stuck with a worse panel and then LG won't provide another replacement.
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post #7599 of 7827 Old 09-01-2019, 12:09 PM
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The most likely outcome is LG will tell you the TV is within spec and to bugger off.

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post #7600 of 7827 Old 09-01-2019, 01:48 PM
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OLED Screen Uniformity Discussion-Banding and Vignetting

Quote:
Originally Posted by Yukon Trooper View Post
The most likely outcome is LG will tell you the TV is within spec and to bugger off.


If they do that I would just go in twitter and search posts about LG OLED and upload the photo of the tinting and say that “LG considered with in spec and is refusing to replace my panel. Be careful. I looks like someone peed on my screen!” And tag @LG as well as some of the higher ups. That might get some action. Maybe first get a respected TV reviewer to say that it is defective first like I did here.



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post #7601 of 7827 Old 09-01-2019, 03:26 PM
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Quote:
Originally Posted by b_rad4 View Post
If they do that I would just go in twitter and search posts about LG OLED and upload the photo of the tinting and say that “LG considered with in spec and is refusing to replace my panel. Be careful. I looks like someone peed on my screen!” And tag @LG as well as some of the higher ups. That might get some action. Maybe first get a respected TV reviewer to say that it is defective first like I did here.
I agree. That's what everyone should do.

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post #7602 of 7827 Old 09-01-2019, 06:27 PM
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My local satellite Best Buy has a 77" A9G up for display and sale at a discounted rate. I'm tempted to bring some slides and have a look at them, but I fear the in-store lighting will make searching out banding defects almost impossible. They were playing Endgame (in a dim filmic mode at that, I guess they don't really want to sell it, lol), which is loaded with grayish dark scenes, and it looked perfect in that environment.
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post #7603 of 7827 Old 09-03-2019, 02:16 PM
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New LG C9 65". Amazing image quality. Noticed some banding and some vignetting right away but was more concerned about a bright vertical band. After a pixel refresh the band is gone. Wasn't too concerned about the vignetting on the left side until I saw it in actual content. It shows up in 15% and below grays. I know opinions vary wildly but I have only had it for a week. Should I exchange and roll the dice? Here are a few pics of the vignetting on mine followed up with a shot of a clean one from our studio at work that has no vignetting. Obviously the photos magnify the image.
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post #7604 of 7827 Old 09-03-2019, 02:27 PM - Thread Starter
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Originally Posted by ViperJPB View Post
New LG C9 65". Amazing image quality. Noticed some banding and some vignetting right away but was more concerned about a bright vertical band. After a pixel refresh the band is gone. Wasn't too concerned about the vignetting on the left side until I saw it in actual content. It shows up in 15% and below grays. I know opinions vary wildly but I have only had it for a week. Should I exchange and roll the dice? Here are a few pics of the vignetting on mine followed up with a shot of a clean one from our studio at work that has no vignetting. Obviously the photos magnify the image.
How many hours on it? Although after one pixel refresh and the vignetting still being there I’d be looking for a replacement.

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post #7605 of 7827 Old 09-03-2019, 02:30 PM
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How many hours on it? Although after one pixel refresh and the vignetting still being there I’d be looking for a replacement.
Less than 15 hours. But you are saying what I was afraid of...shouldn't be like this.
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post #7606 of 7827 Old 09-03-2019, 02:34 PM - Thread Starter
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Less than 15 hours. But you are saying what I was afraid of...shouldn't be like this.
You could let it run through a couple of auto-cycles and check it if you’re not in danger of running out of your return window.

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post #7607 of 7827 Old 09-03-2019, 02:36 PM
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You could let it run through a couple of auto-cycles and check it if you’re not in danger of running out of your return window.
Good thought. Just Auto cycles or run it through a manual one too? I will have to check on my return window. Best Buy purchase but delivered a week later....so if they count it from the day of delivery I got a week left, if not....
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post #7608 of 7827 Old 09-03-2019, 02:40 PM - Thread Starter
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Good thought. Just Auto cycles or run it through a manual one too? I will have to check on my return window. Best Buy purchase but delivered a week later....so if they count it from the day of delivery I got a week left, if not....
I would run auto cycles. If after a couple there’s no significant improvement return it. I’m sure some would say after the one manual refresh it probably is what it is but it can’t hurt if you’re still safe for a return. Hope springs eternal and/or packing up a big TV to return sucks.

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post #7609 of 7827 Old 09-03-2019, 02:45 PM
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Originally Posted by VidPro View Post
You could let it run through a couple of auto-cycles and check it if you’re not in danger of running out of your return window.
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Originally Posted by VidPro View Post
I would run auto cycles. If after a couple there’s no significant improvement return it. I’m sure some would say after the one manual refresh it probably is what it is but it can’t hurt if you’re still safe for a return. Hope springs eternal and/or packing up a big TV to return sucks.
Thx! Will do. I'm on hold with Best Buy right now to figure out my return window. Hoping a few cycles clear it up cuz putting this back in the box will suck.
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post #7610 of 7827 Old 09-05-2019, 08:54 AM
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I must be nuts but I just don't recall seeing this banding issue on my E7 panel.
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post #7611 of 7827 Old 09-06-2019, 06:39 AM
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Originally Posted by VidPro View Post
I would run auto cycles. If after a couple there’s no significant improvement return it. I’m sure some would say after the one manual refresh it probably is what it is but it can’t hurt if you’re still safe for a return. Hope springs eternal and/or packing up a big TV to return sucks.
They count from day of delivery.

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post #7612 of 7827 Old 09-07-2019, 07:53 AM - Thread Starter
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Sometimes it’s nice just to forget about the faults and sit back and try to enjoy. I did that last night watching Rocketman on a 4K disc. It looked amazing and sounded great too. Can’t wait to upgrade and hopefully find a winner next time.

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post #7613 of 7827 Old 09-10-2019, 03:12 AM
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not that i'm trying to find something wrong with my TV, honestly I'm happy with it. but i would hate to notice something later on and be stuck. i only have 5 days left in my return window and i'm curious what you guys think. here is my 5% gray and 100% white. as far as banding, it's much better than my c7, i hardly notice it. tinting i have no clue if it's there. the pictures look worse than it does in person. what's a good movie or show to see where i would notice tinting if i have it? thanks.
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post #7614 of 7827 Old 09-10-2019, 03:43 AM
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Not a fan of the gashes in gray, I'd see them in content eventually. As for white, seems a bit pinkish on the perimeter, mostly the right side. Anything with snowfields is good to check to see if it's a bother (I.E. the film Inception).
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post #7615 of 7827 Old 09-10-2019, 05:00 AM
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Quote:
Originally Posted by video_analysis View Post
Not a fan of the gashes in gray, I'd see them in content eventually. As for white, seems a bit pinkish on the perimeter, mostly the right side. Anything with snowfields is good to check to see if it's a bother (I.E. the film Inception).
thanks, this is after 306 hours. i have not done any manual compensation cycles. i wonder if i should do one?

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post #7616 of 7827 Old 09-10-2019, 05:24 AM
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So far I love my c9 but today noticed in a snowy scene a yellow band towards the right side. I'm still in my return window. I have really good gray uniformity but my white shows magenta on the left and a yellow band on the right. The idea of exchanging it sounds rough. What do you all think?
Uniformity

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post #7617 of 7827 Old 09-11-2019, 01:57 PM
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@jk82 , looking forward to seeing your results in the uniformity tracking thread. Hopefully it performs as well as others have reported and better than your C8. Once you have them equally calibrated, maybe post a side-by-side comparison using same camera settings?
Well, I spent 2 days watching lots of movies on the GZ2000 and trying to somehow adjust the low-end to a point where it wouldn't annoy me.

Here is a 3% using the default True Cinema Preset which is 100 nits, gamma 2.4. I measured the center and also the top left corner.



Now what the hell am I supposed to do with that when the center is too dark and the corner way too bright??
While watching dark scenes I often see the left or right edge/corner glow like it was an edge-lit LCD. I also tried crushing the low-end but that just shifts the problem and doesn't really solve it.

Some movie scenes (UHD Blu-Ray) showing the glowing corner/edges:





C8 vs GZ2000 white uniformity:
This picture might be bit deceiving because the TVs are angled. On the C8 I have some greenish tint towards the left edge which I can see in content. I prefer the GZ2000 for white uniformity, it's not perfect but it didn't distract me in content yet.

C8_vs_GZ2000 5% gray(100 nits gamma 2.4):
On the 5% both look okayish to my eye, the camera exaggerates the uniformity issues. The C8 has one somewhat noticeable band and the GZ2000 never really showed any banding during movie watching but it has huge brightness differences the more you go towards black like seen in my measurement. I would even say I prefer the C8 uniformity below 5%. Sometimes seeing a band is less annoying than the edge-lit LCD look that my GZ2000 shows in certain scenes. I tried taking photos of the lower range but they turned out to be complete crap.


The GZ is going back, already talked to the retailer and they were very very keen on trying to get me to get this solved through panasonic which I of course do not want. They constatntly told me that maybe my picture settings are wrong.

They also didn't seem to want to swap it so I guess I'm gonna get my money back as I have a 14 day return period by law.

This really pains me as I really like the GZ2000 if only there weren't those near-black non-uniformities on my set.


edit: before anyone asks, the GZ has already run multiple auto comp cycles and even one manually triggered big one. It didn't change anything.
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post #7618 of 7827 Old 09-11-2019, 03:24 PM
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Well, I spent 2 days watching lots of movies on the GZ2000 and trying to somehow adjust the low-end to a point where it wouldn't annoy me.
edit: before anyone asks, the GZ has already run multiple auto comp cycles and even one manually triggered big one. It didn't change anything.
Thanks for doing all that testing. Very informative.

That's a real bummer to get such good uniformity that is spoiled by the reverse vignetting. Reverse vignetting is something LG has struggled with on their 55" models for a very long time (at least since 2016). I thought they had vignetting mostly figured out at 65". Guess not.

Definitely not acceptable because you will see that edge-bleed during every single fade-to-black for content that was mastered with non-zero blacks. It will look like a regular VA panel LCD where the edges glow the same way because they are off-angle.

Returning is the right choice. I don't recall any other GZ2000 owner complaining about this issue online so maybe worth trying another from a different store?

Regarding the compensation cycles, do you notice any difference compared to what the C8 is doing? Are the auto cycles also 4 hours apart? Do they run for the same amount of minutes before the set turns off? Same for the manual ones where you see the white line going down the screen. Just trying to determine if Panasonic is doing anything unusual with their comp cycles.
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post #7619 of 7827 Old 09-11-2019, 03:44 PM
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Returning is the right choice. I don't recall any other GZ2000 owner complaining about this issue online so maybe worth trying another from a different store?

I've read all the GZ2000 threads and haven't seen/heard anything like that either, so maybe this is just a rare case. I tried going for a swap but they were only interested in redirecting this to panasonic and I have no interest in dealing with the manufacturer, they will just tell me it's within specs...

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Regarding the compensation cycles, do you notice any difference compared to what the C8 is doing? Are the auto cycles also 4 hours apart? Do they run for the same amount of minutes before the set turns off? Same for the manual ones where you see the white line going down the screen. Just trying to determine if Panasonic is doing anything unusual with their comp cycles.
It's 4 hours accumulated for the auto comp cycle just like on the LG but the runtime is about a minute shorter compared to my C8.

As for the big comp cycle, in the manual it states that it takes 80 minutes but it didn't run that long. I can't tell the exact time because I wasn't at the TV the whole time and when I checked at like 70 minutes it was already finished. The manual also mentions the white line so I can only assume that it's similar to what LG does.
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post #7620 of 7827 Old 09-12-2019, 01:02 AM
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Quote:
Originally Posted by jk82 View Post
The GZ is going back, already talked to the retailer and they were very very keen on trying to get me to get this solved through panasonic which I of course do not want. They constatntly told me that maybe my picture settings are wrong.
They don't have the slightest clue who they are talking to

Quote:
Originally Posted by jk82 View Post
Well, I spent 2 days watching lots of movies on the GZ2000
Did you managed to test PC mode (23p judder free playback with chroma 4:4:4 with SDR and HDR) with it (as we did with the C8)? (I couldn't find any info about it half a year ago.)

Quote:
Originally Posted by Wizziwig View Post
I don't recall any other GZ2000 owner complaining about this issue online ...
Quote:
Originally Posted by jk82 View Post
I've read all the GZ2000 threads and haven't seen/heard anything like that either, so maybe this is just a rare case.
Or (and I think that's the case): you are the only (!) one who tests these displays so thoroughly
mrtickleuk likes this.

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