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Is this a lot of BLB?

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post #1 of 14 (permalink) Old 01-07-2019, 07:20 AM - Thread Starter
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Is this a lot of BLB?

Might be trading monitors. This is an Acer Pred XB271HU. Is there a lot of BLB? First picture

https://imgur.com/gallery/IUVDBKz

https://imgur.com/gallery/BfyNL1Q


Last edited by killuchen; 01-07-2019 at 07:30 AM.
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post #2 of 14 (permalink) Old 01-07-2019, 07:42 AM
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Yeah, I'm thinking this is terrible backlight bleed, but these kind of things are hard to decide 100% through photos compared to seeing it in person with your own eyes.

A way to distinguish how much of it is just normal "IPS glow" and what's backlight-bleed is this: move your head (or your camera) around and position it so you are hovering at a right angle to the surface over the edge or corner you want to judge. When you are looking at the surface in front of you at a right angle, is a black color in that spot now dark or not? If it's dark, the shine you were seeing was IPS glow. If it's still bright, it is backlight bleed.
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post #3 of 14 (permalink) Old 01-07-2019, 07:51 AM - Thread Starter
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Quote: Originally Posted by deepor View Post
Yeah, I'm thinking this is terrible backlight bleed, but these kind of things are hard to decide 100% through photos compared to seeing it in person with your own eyes.

A way to distinguish how much of it is just normal "IPS glow" and what's backlight-bleed is this: move your head (or your camera) around and position it so you are hovering at a right angle to the surface over the edge or corner you want to judge. When you are looking at the surface in front of you at a right angle, is a black color in that spot now dark or not? If it's dark, the shine you were seeing was IPS glow. If it's still bright, it is backlight bleed.
That's what I'm scared of. The person lives in another state and I don't want to go through with the deal if it's as bad as the pictures lol.

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post #4 of 14 (permalink) Old 01-08-2019, 06:03 AM
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Its bad the uniformity. Ive got multiple AUO panels with near perfect uniformity.
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post #5 of 14 (permalink) Old 01-08-2019, 06:24 AM
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As always you're confusing BLB and glow.

  1. Turn off ALL lights in the room and make it pitch black.
  2. If you want to check for BLB go 3m away from the monitor and then take the picture. At least 2m really. If you want to see the BLB it should be well exposed so that LCD "black" is dark gray on photo. Monitor can be small in the picture or you can zoom in if you have zoom lens or 75mm+ lens to make the monitor bigger in photo.
  3. If you want to check for glow, use 50mm or smaller (35mm equiv. lens) and take a photo of the monitor from close distance usually from where you sit and monitor fills whole photo.
  4. You can also check for glow if you want to do comparisons by calibrating brightness of the display and then taking same camera parameters photo at distance 0 from panel and focused to infinity. Again 50mm or lower lens, the smaller = the wider = the more angle and glow it will capture.
  5. Always take the photo dead center, perfectly centered on monitor center and at 90deg. Not looking from above at an angle etc.

This happens here over and over and over again, people taking photos from short distance complaining about BLB when in fact they took a photo of glow.
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post #6 of 14 (permalink) Old 01-08-2019, 06:43 AM - Thread Starter
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Quote: Originally Posted by JackCY View Post
As always you're confusing BLB and glow.

  1. Turn off ALL lights in the room and make it pitch black.
  2. If you want to check for BLB go 3m away from the monitor and then take the picture. At least 2m really. If you want to see the BLB it should be well exposed so that LCD "black" is dark gray on photo. Monitor can be small in the picture or you can zoom in if you have zoom lens or 75mm+ lens to make the monitor bigger in photo.
  3. If you want to check for glow, use 50mm or smaller (35mm equiv. lens) and take a photo of the monitor from close distance usually from where you sit and monitor fills whole photo.
  4. You can also check for glow if you want to do comparisons by calibrating brightness of the display and then taking same camera parameters photo at distance 0 from panel and focused to infinity. Again 50mm or lower lens, the smaller = the wider = the more angle and glow it will capture.
  5. Always take the photo dead center, perfectly centered on monitor center and at 90deg. Not looking from above at an angle etc.

This happens here over and over and over again, people taking photos from short distance complaining about BLB when in fact they took a photo of glow.
Understood, it's a monitor that I'm thinking about trading from someone that lives in a different state. He sent me this picture. What do you think?

https://imgur.com/gallery/rxHv4v6

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post #7 of 14 (permalink) Old 01-08-2019, 07:30 AM
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It definitely has BLB. But guessing that's an Acer AUO M270DAN2.x based monitor, you could try loosen the screw behind bottom logo to try and reduce bottom BLB. Depends what kind of trade and what other issue there may be.
These AUO M270DAN2.x based monitors have tons of quality issues to watch out for. If you can't see monitor in person or return it for money back, I wouldn't buy it.

I bet the monitor on last picture will also suffer from yellowing due to the BLB overall. Sure it's maybe not bright BLB on whole screen but it does affect the panel and makes it tint to yellow from my experience.

Acer XB might have better luck than XF but it's still quite bad lottery.
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post #8 of 14 (permalink) Old 01-08-2019, 08:29 AM
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In this new photo, this might actually be normal. I don't feel confident judging it. You can see he took the picture from the right side, and the right edge of the monitor now looks like pretty similar brightness to the center of the monitor. The same might happen to the other sides if you take the photos from there as well?

Did you have IPS monitors at home in the past? If you have never used them in a dark room, it's shocking how bad they can be in that situation. I like IPS best but I still can't use it in the dark, there always has to be dimmed lighting in the room or the glow will drive me crazy.

Here's me playing a bit with an image editor and your last photo. This here is the brightness levels balanced around the center of the monitor used as the black point:

https://i.imgur.com/NeQ4kwB.png

This here is that darkest area in the bottom center chosen as the black:

https://i.imgur.com/EGMsdWt.png

And this is using an area towards the upper right of the monitor:

https://i.imgur.com/HLuGJcS.png

I also tried clicking in an area in the bottom left, and then you get this boring result:

https://i.imgur.com/WPiqNTC.png
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post #9 of 14 (permalink) Old 01-08-2019, 08:46 AM
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Hi,
Did the seller take a print screen image and send it to you too while taking camera images.

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i9-99400x With evo and koolance vrm water blocks
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Case
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post #10 of 14 (permalink) Old 01-08-2019, 09:25 AM - Thread Starter
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So the trader is willing to ship me the monitor at his expense to see if I like it. I can always ship it back if I don't I'd say that's a win win lol. I'll report back when I receive it on Thursday.

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