Is backlight bleed ever something that just diminishes/goes away?

kissenger

kissenger

kissenger

Associate
Joined
10 Apr 2008
Posts
2,491
I'm wondering this because I just bought a Dell U2312HM and I'm really, really not impressed so far. Viewing angles are poor, but most importantly there is really bad backlight bleed. You can see it in the picture:

25jy4qt.jpg


It's the bottom right corner that's the most annoying because it's really noticable and makes blacks look grey/silverish. The only things that seem to help are tilting the screen up a bit, sitting further away and/or sitting to the right of my monitor - none of which I particularly want to do.

It does seem to have died down a bit since I first turned it on, so is this something that can potentially just fade away (at least a bit) over time?
 
Looks like you got lucky, that's not half as bad as most people who posted pictures of back light bleed with the Dell U2713HM.

This kind of thing will probably always be a problem with side lit LED
 
Unless you buy very expensive TFTs your always going to get some backlight bleed on a totally black screen (is usually very hard to see in normal operation) that screen shot looks fairly low compared to many I've seen.
 
Rroff said:
Unless you buy very expensive TFTs your always going to get some backlight bleed on a totally black screen
Click to expand...

It's not really got to do with cost it has to do with side lighting screens to make them thinner. I have used many old cheap back lit ccfl screens that had much less back light bleed than newer more expensive side lit led.
 
Well that's a shame. I honestly think that the backlight bleed thing has gotten worse with the latest generation of monitors. What's the point of having such high contrast ratios if you're going to ruin it with backlight bleed? No one needs a monitor so thin that you need to put the LEDs at the side.

Oh well, at least the panel handles interpolation better than my old monitor. I just tried running Metro 2033 at 720p and it was almost as crisp as at 1080p.
 
tuxy said:
It's not really got to do with cost it has to do with side lighting screens to make them thinner. I have used many old cheap back lit ccfl screens that had much less back light bleed than newer more expensive side lit led.
Click to expand...

I have used many of both backlight type that are problematic and many of both that aren't. The issue isn't so much the placement of the backlight as the pressures on the diffuser and other screen components during and after manufacture. These tend to be greater on thinner screens and also larger screens - hence problems seeming to be more common now. The Dell U2311H is a prime example of a CCFL backlit model plagued with problems - to a much greater extent than its successor here.
 
My 2412 has a bit of backlight bleed in the bottom left corner. My LG IPS screen does not have any.
It seems to be a common thing with Dell screens lately.
 
MOOGLEYS said:
My 2412 has a bit of backlight bleed in the bottom left corner. My LG IPS screen does not have any.
It seems to be a common thing with Dell screens lately.
Click to expand...

Actually that's just an inter-unit thing. Most of LG's own IPS models frequently suffer from issues backlight bleed and uniformity issues. You are one of the lucky ones - but there are plenty of Dell units out there without any such issues as well.
 
Sorry for going slightly off topic but I don't think my question warrants it's own thread.

Is backlight bleed mostly an issue when viewing the screen in a dark room? Most people seem to make a big deal out of it but I never turn the lights off when I'm on my PC so I was wondering if all of these recent 27" bleeders would even bother me.
 
The Bass said:
Sorry for going slightly off topic but I don't think my question warrants it's own thread.

Is backlight bleed mostly an issue when viewing the screen in a dark room? Most people seem to make a big deal out of it but I never turn the lights off when I'm on my PC so I was wondering if all of these recent 27" bleeders would even bother me.
Click to expand...

It is noticable, but it's not something that would really, really annoy you unless you were looking for it. Also, it's only noticable in dark scenes. If there's a lot of colour in the image you're looking at, you won't notice a difference.
 
It all depends on how severe it is and what you're looking at. If you have a dark (black) wallpaper and have monitor with severe backlight bleed on the top of the screen then you can bet your ass on it that it will annoy you to no end. If it's a very severe case of backlight bleed you will see it as soon as you turn the monitor on and ready to start packing it back in to send it back.
As this topic clearly shows however it's all completely random, all monitors suffer from it to some degree and a few monitors like the Samsung S27A950D nearly always have it quite badly (big screen, lots of pressure on the bottom corner).
The more expensive a monitor is the less accepting people become of its flaws as well.
 
I don't understand how these units can suffer from it so badly yet they can sell off these Korean units for £200 and they don't have any back light bleed.

I can understand the logic behind trying to make a TV as thin as possible but in a mid-high priced monitor it doesn't make sense to reduce the screen quality surely?
 
DeathStorm said:
I don't understand how these units can suffer from it so badly yet they can sell off these Korean units for £200 and they don't have any back liglight bleed.
Click to expand...

No that wouldn't make sense, but it isn't the case at all. There are many reports of backlight uniformity issues on such monitors. Given the price to performance and relatively low yields sold it isn't generally brought up so much is all.
 
And the Dell U2713HM I reviewed was pretty much free from bleed. Same with the XL2420T I reviewed last year... It varies between units.
 
Last edited:
Having looked at the problem more I'm not sure it's even really a matter of 'bleed' because it's not even evident if you sit further away from the screen. I suspect it's the 'sheen' that you get on IPS panels. If I sit super-close the bleed is basically all over the screen. If I sit a couple feet away there's no bleed. Very strange.
 
Yep. It's definitely IPS sheen and not backlight bleed. Check this out:

IMG_0101.jpg


I sat 1 foot further back from my monitor and took that (zoomed in on my iphone) and the bleed is completely gone.
 
You must log in or register to reply here.
Back
Top Bottom