OLED Screen Uniformity Discussion-Banding and Vignetting - Page 287 - AVS Forum | Home Theater Discussions And Reviews
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post #8581 of 9326 Old 04-26-2020, 05:50 AM - Thread Starter
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Originally Posted by Wizziwig View Post
I suspect until the pandemic lockdown is lifted in most areas, you're not going to see many slides posted here of the 2020 models. Economic uncertainty is also limiting the amount of people willing to spend $$$ on upgrading expensive TVs. I usually try to test new models myself but around here all dealers with demo models are closed and many won't reopen because they've gone out of business. I never buy displays without checking them out in person (not interested in playing panel lotteries) so likely no TV upgrades for me in the foreseeable future unless there is some confirmed breakthrough in uniformity from many owners (especially from serial TV upgraders/returners).
There aren’t enough small places that sell equipment (that goes for other mom & pop places) as it is and to think a lot of them will be gone after this nightmare is depressing.
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post #8582 of 9326 Old 04-26-2020, 12:41 PM
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That is true. Even before the current crisis, most of the smaller home theater dealers were struggling due to online competition. But they were the best place around here where you could properly test a TV before buying it. I was lucky to live in an area where many of these smaller dealers also sold front projectors so they had very good light control for testing near-black uniformity and artifacting (flashing and quantization macroblocking). Fry's just recently went under as well so only thing left is Best Buy. I find most BB locations useless for testing TVs because of the high ambient lighting and reflections but there are a few stores around me which have decent light control in their smaller Magnolia testing rooms. You need to look around. A couple hours spent in a store with my own test patterns played from USB flash drive is a better use of my time than dragging huge heavy TVs home only to return them a few days later. I do still appreciate the people willing to go through this process every year (you know who you are) because they provide us a more trustworthy perspective from someone known to be very picky and discerning regarding image quality.
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post #8583 of 9326 Old 04-27-2020, 02:09 AM
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Originally Posted by Wizziwig View Post
I do still appreciate the people willing to go through this process every year (you know who you are) because they provide us a more trustworthy perspective from someone known to be very picky and discerning regarding image quality.
Good point, Wizziwig! I also appreciate that some people make the effort to play the panel lottery, sharing their photos and observations here. They've given me a heads-up about real problems that aren't always mentioned in reviews, and they may help raise the standard for quality control as well.
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post #8584 of 9326 Old 04-27-2020, 02:07 PM
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Hello all,


I have had a LG C9 for the past month or so with over 500 hours usage time. My return timeframe technically ends Wednesday, but Best Buy has extended all returns of recent purchases to May 31. Overall, I have been happy with the TV, but I started noticing "flashlighting" in the lower left-hand corner. Knowing that flashlighting does not occur with OLEDs (but having had it horribly on some LEDs), I did some research and came upon 5% greyscale test screens. Mostly, I found the 5% to look decent, though 2% had some banding. However, after reading a post here about setting the OLED light to 30 to 40, I retested and was not happy. In regular content, the only problem is excess brightness in darker scenes in that lower left corner, but in the 5% greyscale I can clearly see that corner lit up.

Before I pull the plug on getting it replaced, I thought I would get some feedback on the panel. Any thoughts would be appreciated.
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post #8585 of 9326 Old 04-28-2020, 01:47 AM
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Hello all,

I have had a LG C9 for the past month or so with over 500 hours usage time. My return timeframe technically ends Wednesday, but Best Buy has extended all returns of recent purchases to May 31. Overall, I have been happy with the TV, but I started noticing "flashlighting" in the lower left-hand corner. Knowing that flashlighting does not occur with OLEDs (but having had it horribly on some LEDs), I did some research and came upon 5% greyscale test screens. Mostly, I found the 5% to look decent, though 2% had some banding. However, after reading a post here about setting the OLED light to 30 to 40, I retested and was not happy. In regular content, the only problem is excess brightness in darker scenes in that lower left corner, but in the 5% greyscale I can clearly see that corner lit up.

Before I pull the plug on getting it replaced, I thought I would get some feedback on the panel. Any thoughts would be appreciated.
You could do WAY worse. Check out my 5% gray photo on page 282 of this thread. The lower fifth of the panel is considerably brighter than the rest. This is still detectable at 10% gray, but at 5% it's dramatic, and it gets worse as the panel nears black. When I watch movies with low contrast and content mastered near black, the bottom of the image is noticeably brighter (especially the lower right corner). What's more, the panel has vignetting on both sides (the right especially), and some bands (although the edges are so soft they rarely distract in content; they show up more as "streaks" - slightly varied luminance like an uneven paint job, rather than the crisp bands I see in many pics on this thread).

Yet, several people counseled me to keep this panel as they have seen worse. I've seen photos of panels on this thread with multiple "hot spots." They can be on the sides, top, and bottom. Your bright patch is much smaller than mine - and the only bands you see are at 2%? That's a keeper in my book!
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post #8586 of 9326 Old 04-28-2020, 08:53 AM
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Originally Posted by Video Auteur View Post
You could do WAY worse. Check out my 5% gray photo on page 282 of this thread. The lower fifth of the panel is considerably brighter than the rest. This is still detectable at 10% gray, but at 5% it's dramatic, and it gets worse as the panel nears black. When I watch movies with low contrast and content mastered near black, the bottom of the image is noticeably brighter (especially the lower right corner). What's more, the panel has vignetting on both sides (the right especially), and some bands (although the edges are so soft they rarely distract in content; they show up more as "streaks" - slightly varied luminance like an uneven paint job, rather than the crisp bands I see in many pics on this thread).

Yet, several people counseled me to keep this panel as they have seen worse. I've seen photos of panels on this thread with multiple "hot spots." They can be on the sides, top, and bottom. Your bright patch is much smaller than mine - and the only bands you see are at 2%? That's a keeper in my book!
Thanks for the feedback Video Arteur. Originally, I thought the only bands were at 2%, and was going to keep the TV at that time, but after setting the OLED lighting to 30, the bands were very visible at 5%.

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post #8587 of 9326 Old 04-28-2020, 01:18 PM - Thread Starter
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Thanks for the feedback Video Arteur. Originally, I thought the only bands were at 2%, and was going to keep the TV at that time, but after setting the OLED lighting to 30, the bands were very visible at 5%.
I can’t imagine those bands NOT showing up in some content. I’d try again but it depends on how much you can stomach.

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post #8588 of 9326 Old 04-28-2020, 03:43 PM
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I can’t imagine those bands NOT showing up in some content. I’d try again but it depends on how much you can stomach.
Thanks for the input. I have put in an order for a new one. I am hoping to resist testing it with greyscale slides and just watch it with normal content until I find a problem if any. Thanks again!
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post #8589 of 9326 Old 04-28-2020, 10:20 PM
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Slide from my brand new 77 inch CX. This was taken at about 5 hours screen time but before any compensation cycle would have run, as I was playing content for a couple of hours before this. Watched some challenging content (Mandalorean S1E5 night time desert scenes) to try to see it. It was very faintly visible in some fast moving scenes, but otherwise not at all. Not going to bother me at all.

Edit: Added 10% and 15% slides. It's not too bad on them. This is set at the default OLED light level OOTB for iSF dark, which is 60 I think. I plan to calibrate the TV soon when Calman 20 is out, and workflow for AutoCal has been defined for DV.
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post #8590 of 9326 Old 04-29-2020, 01:06 AM
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^^^ I guess that answers my earlier question on whether LG has cracked the formula on solving near-black vertical banding like Panasonic did last year. Shame Panasonic is pulling out of Australia and NA market completely for 2020 (even Canada). Only hope now is with 2020 Sony models. Maybe Panasonic will share their secrets with their Japanese neighbors rather than take them to the grave when they exit their remaining TV markets.
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post #8591 of 9326 Old 04-29-2020, 02:39 AM
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"exit"?! You make it sound as if Panasonic are leaving the business entirely! Panasonic are not going to stop selling TVs in Europe or Japan any time soon.
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post #8592 of 9326 Old 04-29-2020, 09:15 AM
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Originally Posted by rajendra82 View Post
Slide from my brand new 77 inch CX. This was taken at about 5 hours screen time but before any compensation cycle would have run, as I was playing content for a couple of hours before this. Watched some challenging content (Mandalorean S1E5 night time desert scenes) to try to see it. It was very faintly visible in some fast moving scenes, but otherwise not at all. Not going to bother me at all.

Edit: Added 10% and 15% slides. It's not too bad on them. This is set at the default OLED light level OOTB for iSF dark, which is 60 I think. I plan to calibrate the TV soon when Calman 20 is out, and workflow for AutoCal has been defined for DV.
where did you purchase the 77 CX?

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post #8593 of 9326 Old 04-29-2020, 10:35 AM
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Seeing that CX makes me feel a little more comfortable about holding onto my A9G for another generation. I'm sure there will be some good ones and some bad ones, just like in years past.

As for Panasonic, I'll never understand their business model. There were rumors going around that they were going to return to the US market just a few years ago - and now they're shrinking down even further.

I try not to read about their OLEDs too much, as I just become very annoyed. Us US folk are better off just pretending that they don't even exist
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post #8594 of 9326 Old 04-29-2020, 12:00 PM
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where did you purchase the 77 CX?
Cleveland Plasma.
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post #8595 of 9326 Old 04-29-2020, 12:08 PM
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Honestly, with no comp cycles having been completed, I would implore you to take some more photos after approximately 4 of them have completed.
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post #8596 of 9326 Old 04-29-2020, 12:55 PM
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Cleveland Plasma.
i'm curious did they deliver and set up inside your house or did they only deliver to curb? i know BB is only doing curb delivery.

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post #8597 of 9326 Old 04-29-2020, 01:05 PM
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Honestly, with no comp cycles having been completed, I would implore you to take some more photos after approximately 4 of them have completed.
I plan to. I also didn't read the initial instruction fully. They said to use iSF Dark and OLED light 35, which I assume is for getting panel down to 100 nits. On my CX I do use the iSF Dark mode, but have left OLED light setting of 60 alone for now. I could use Film Maker mode instead, which should be 100 nits, although I don't plan to use the panel at that dim of a setting.
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post #8598 of 9326 Old 04-29-2020, 01:09 PM
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anyone notice the showtimeanytime app on the apple TV supports dolby vision? at least the show Santa Muerte is in DV.

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i'm curious did they deliver and set up inside your house or did they only deliver to curb? i know BB is only doing curb delivery.
They brought the box inside the house but the driver wasn't allowed to set it up. I told the him to to wait while I unpacked the box and examined the panel. Once I saw no physical damage to the TV, I let him go, and set it up over the next hour or so with the help of my son.
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post #8600 of 9326 Old 04-29-2020, 01:19 PM
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Yes, whatever baseline calibrators use for night viewing. I think it's actually around 125-130 nits?
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post #8601 of 9326 Old 04-29-2020, 01:45 PM
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Yes, whatever baseline calibrators use for night viewing. I think it's actually around 125-130 nits?
The reference standard for SDR is exactly 100 nits. That's why on an LG OLED, SDR Technicolour mode has OLED Light=25 which is very close to 100 nits (with panel variations). Any 2020 TV which has "Filmmaker mode" - sorry, I forgot their stupid shouty capitals - "FILMMAKER MODE" - will be set to exactly 100 nits also.

On my LG C8, after calibration:
OLED Light 30 ~= 115 nits
OLED Light 35 ~= 126 nits
OLED Light 40 ~= 141 nits
OLED Light 60 ~= 188 nits (and burned out retinas )

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post #8602 of 9326 Old 04-29-2020, 02:05 PM
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^OK, I don't know why I thought calibration baseline was >100 nits, faulty memory at work. Nevertheless, the OLED light at 35 might be a good balance for those who feel the standard is too dim.
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Originally Posted by rajendra82 View Post
They brought the box inside the house but the driver wasn't allowed to set it up. I told the him to to wait while I unpacked the box and examined the panel. Once I saw no physical damage to the TV, I let him go, and set it up over the next hour or so with the help of my son.
Nice, I had wanted to get this TV but lost my patience and got the 77 C9 instead. i got lucky cause I bought it right before they implemented all these home delivery changes.

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"exit"?! You make it sound as if Panasonic are leaving the business entirely! Panasonic are not going to stop selling TVs in Europe or Japan any time soon.
The writing is on the wall as they say. You can't survive very long if you are shrinking instead of expanding your market. I'm sure there's a plot ready for them in the display graveyard right next to Pioneer.
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I’ve got a 65” C9 with 50 hours on it, & I do see some of these bands in panning shots. Will these get better over time, or is this just a bad panel?


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I'm leaning towards bad panel at 50 hours.
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OLED Screen Uniformity Discussion-Banding and Vignetting

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I'm leaning towards bad panel at 50 hours.

That’s what I was afraid of, & where I got it (Best Buy) they gave me a hard time when I returned an even worse CX (pic below). So I can imagine the hassle they’ll give me if I were to try and return the C9 (still within return period). They love to prove you wrong by showing you the tv under their bright showroom lights, so it’s almost impossible to see these bands or defects.


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post #8608 of 9326 Old 04-29-2020, 04:27 PM - Thread Starter
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I’ve got a 65” C9 with 50 hours on it, & I do see some of these bands in panning shots. Will these get better over time, or is this just a bad panel?


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Looks like my A1E. Prob not gonna get much better.

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post #8609 of 9326 Old 04-29-2020, 05:27 PM
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Looks like my A1E. Prob not gonna get much better.

Did it get even a little better? Do you see your banding often? If I look hard for the bands I can see them in almost every panning shot, (depending on colors in the screen). I can enjoy shows that don’t get too dark as that’s when it tends to produce the most visible banding issues. Unfortunately, I watch stuff and game with a lot of dark content.


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post #8610 of 9326 Old 04-29-2020, 05:57 PM - Thread Starter
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Did it get even a little better? Do you see your banding often? If I look hard for the bands I can see them in almost every panning shot, (depending on colors in the screen). I can enjoy shows that don’t get too dark as that’s when it tends to produce the most visible banding issues. Unfortunately, I watch stuff and game with a lot of dark content.


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They seemingly got a bit better but at the 2000 hour manual comp cycle they came back like day one. I don’t see them often mostly because I gave up caring (I’m not happy about it by any means) and accepted it. If I look I see them in a camera pans. I also have yellow tint on the left side that I see a lot.

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Reply OLED Technology and Flat Panels General

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burn-in , compensation , correction , oled , uniformity

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