Vertical banding tv

Vertical banding tv DEFAULT

Is this OLED banding acceptable?

fox vanilla said:

Thanks for those comparison shots! I found that to be a particular bad scene for it in Snatch. I see yours has some faint bands too. It's a hard call to make whether to stick with it or not as I have neither the time nor energy for panel lottery replacements.

My settings are Cinema mode and 60 for luminance during the movie content shots I posted. I turned the luminance up to 100 for the slide shots to highlight the imperfections.

Would you consider a return Wayne if your set was like mine? Keeping in mind it's low frequency of appearing in actual content I'd say at most 10 percent of the time.

Click to expand...

It's hard to say. Now that I've wrapped my head around the fact that all OLED's have vertical banding (GZ2000 may be the only exception here), I think I can live with it, so long as I don't feel it is ruining my viewing.

I've watched many films since having my FZ802 from April til now, and vertical banding has not been a common occurrence for me.

Snatch is probably the 2nd worst I've seen it. It stood out most for me in American Sniper, towards the end while running towards a truck - the bands became obvious as a sandstorm fills the screen. I've spotted it a handful of times since.

I think tinting may be more of a problem for some. Football and Tennis is probably a good test, if you can watch a footy match without banding cropping up, or the pitch colour shifting - then it's likely a keeper.

I wouldn't say yours is worse than mine, obviously it's hard to judge by photos. What bugs me about mine is the two thick dark horizontal streaks going across the screen.

I do think a dedicated OLED thread for 5% test slides would help new owners like myself and others be able to compare slides, and judge what's normal. More importantly then the discussion can come to any impact with real content.

Edit: I personally find 60 luminance to be too bright for dark room viewing. Following avforums review for dark room viewing I use Professional 1 with 2.4 gamma, and luminance no higher than 30 (for me).

 

Sours: https://www.avforums.com/threads/is-this-oled-banding-acceptable.2241923/

Vertical Banding on TV screen! Can it be fixed?

I am often joked about by my family and friends as a “pretentious know-it-all”. However, when I was asked the other night about a band-like persistent thing appearing on my friend’s TV screen, I was left stumped. And hence, I did some digging.

Vertical banding refers to a uniformity defect in the TV screen. These bands may not be noticeable when the TV is turned off or during general viewing, but they usually become visually apparent when the camera pans out across solid dark backgrounds. Unfortunately, there is no sure way of fixing it. If your TV is brand new then, perhaps, it may at times correct after about 100 hours of viewing. However, for older TVs there is no fix without repair or replacement.

For more information regarding what is vertical banding, how to identify whether your TV has this problem and whether your product warranty covers this, please read on.

What is Vertical Banding?

Vertical Banding is a uniformity defect of the TV screen. It is not a video artifact from the content side, but an inherent defect in the TV screen. The bands can range from barely noticeable lines to thick bands, which may be few inches in width. They may not be noticeable when the TV is turned off or during general viewing, but they become visually apparent when the camera pans out across solid dark backgrounds. For instance, during a sports telecast when the camera pans across the green field, or when the camera pans out against a dark background.

The following video demonstrates one such TV suffering from the issue of vertical banding. There are noticeable bands in the right half of the screen.

What causes vertical banding?

Vertical banding is a manufacturing defect. It can arise due to multiple reasons. The biggest cause in LED TVs is the backlight. LED TVs function by passing light, from an array of LEDs placed behind the screen, through the LCD display. The light produced from this backlight panel should ideally be uniform across the screen. However, light may not be distributed uniformly across the screen due to a number of different reasons. For instance, the diffusion mechanism of lights may not work as intended, or light may not be distributed uniformly owing to placement of the backlight LEDs (e.g. in edge-lit TVs where LEDs are placed only along the edges).

Banding is observed in some OLED TV units as well. The cause of OLED banding does not arise from backlight issues, as each pixel generates its own light. However, the variations in quality, luminosity and brightness across OLEDs embedded in OLED TVs can cause banding in them.

Further, these bands may also be caused due to manufacturing defects arising during the assembly of multiple layers of the TV screen.

Do all TVs have vertical banding?

The issue of vertical banding has been observed in LCD, LED as well as OLED TVs. However, not all TVs have this issue. As elaborated earlier, it may arise due to multiple reasons. Further, the magnitude of banding also varies a lot.

What is gray uniformity?

Gray uniformity refers to the level of uniformity of a TV screen while displaying a single solid color. The lack of this uniformity when arising due to presence of visible vertical bands on the TV screen is called as vertical banding.

Rtings measures gray uniformity by calculating the standard deviation of color values of the pixels displayed on the TV screen. This also helps in measuring other kinds of issues in screen uniformity as darker patches in parts of the screen. The presence of these dark patches is also known as dirty screen effect.

How to know whether your TV has vertical banding?

Vertical banding may be noticed while viewing content on the TV as well as by running some test videos on Youtube.

One of the most famous tests of vertical banding is a particular section of Episode 2 of Season 1 of Marco Polo on Netflix. The scene begins at 14:20. The scene showcases the camera panning out against the night landscape. Even the most faint vertical bands stand out when the camera pans out against the dark night sky in this scene.

There are also multiple test videos available on Youtube, which can help in confirming presence or absence of vertical bands on your TV. The following video is a great test which plays multiple slides with increasing percentage levels of gray, which helps in identifying vertical banding. If your TV has vertical banding, it will be most prominent on the slides with gray levels between 2% and 10%. As the gray level keeps increasing, vertical bands, if they exist, become more difficult to be noticed.

My new TV has vertical bands! Should I replace it right away?

If you have just bought a new TV and are looking to check for vertical banding immediately after it is out of the box, I would suggest you to refrain from doing so. Although, you may be tempted to check for these bands and, in case they exist, you would want to get your TV exchanged as soon as possible within the exchange period. However, it has been observed by multiple users that vertical bands in new TVs tend to reduce after some usage. This usage threshold is around 100 hours of viewing.

Further, vertical banding is a manufacturing defect. There is no guarantee that the replacement TV would not have this issue or would have it to a lesser degree. Hence, before taking a call regarding replacement of your new TV, do allow it some screen time.

How to fix vertical banding?

There is no sure way to fix vertical banding. Although for newer TVs, it has been observed that vertical bands subside after about 100 hours of viewing.

Another method can be tried in TVs which provide for a pixel refresher in the settings menu. For instance, LG OLED TVs provide a pixel refresher. This feature is usually provided for avoidance of image retention. However, some users have highlighted that running this pixel refresher has shown significant reduction in vertical banding.

Is vertical banding covered under warranty?

Vertical banding is ideally covered under the product warranty provided by the manufacturer. You should be able to get a replacement TV in case it can’t be repaired. Further, if the product is new, replacement should be easy.

However, perception of banding is subjective. At times, the service technician may not agree that the banding is significant. See this review by an Amazon customer. To avoid such cases, you should take pictures and videos when banding is at its worst. And use the same content to present banding when claiming service under warranty.

Conclusion

Vertical banding is a uniformity defect in the TV screen which arises due to manufacturing defects. There is no sure method of fixing it, although pixel refresher and screen time of approximately 100 hours have shown probable alleviation of this problem in new TVs. However, if the issue keeps persisting, it is best to replace it while under product warranty.

Sours: https://reallysmartbuyers.com/vertical-banding-on-tv-screen-can-it-be-fixed/
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Question How bad is my vertical banding? (return?)

As a side note, and this is something I’ve never experimented with as I’ve never done any tests like this with my own TV’s is to consider the screen refresh rate effecting the uniformity of the image.

Do OLED/LCD refresh top to bottom or side to side. If side to side and your camera captures a long exposure part way through a refresh cycle the image will come out slightly lighter on one side than the other.

Camera shutter speed could then effect the picture so locking a shutter speed slightly longer than the refresh rate of your TV in to the camera could improve the result by roughly only capturing one complete refresh cycle rather than one and three quarters for example if you use a long exposure as probably in the example above. So for example 1/50th second for a 60Hz panel or 1/100th second for a 120Hz panel.

I’m a geeky photographer sorry. :blush:

 

Sours: https://www.avforums.com/threads/how-bad-is-my-vertical-banding-return.2239374/

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Banding tv vertical

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Possible Fix For Lcd Tv, Vertical Screen Banding, Dirty Screen Effect, 9hrs

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