Is it possible for light leakage to get better as time goes on? - Page 2

I can personally see my light leakage after 2 weeks of steady use.... but It's faiding away slowly. I've compared DVD watching with it and a total black screen in certain areas.

I can understand it being a seal issue when the leakage is only around the edges, but a common area for leakage is a few inches below the top edge where 2 oval shaped areas spaced roughly an inch apart are prevalent.
What would cause these 2 spots to appear? (See my Leaky post for pics)

I still maintain that this is a ground issue associated with either static, ro some other electric field, given off by the ballast/condenser/capacitor for the flourescent light.

I took my old Gateway lappie into the bathroom, drew up a 0-0-0- color bmp, F11ed it to the whole screen, and hit the bastard with the wifes hairdryer.

I could NOT get a localized "light leakage" to appear in relation to the hair dryer, and that puppy was HOT!

The "heat causes it" thing is pure bullshit. A squeezed screen will do funny things, but in the 6 or 7 LCDs I've taken apart, I've never seen anywhere that was so tweaked down that it should cause anything less localized than a thumbprint sized irregularity.

I havn't been able to prove my own theory, but I have been able (to my own satisfaction) disprove the two most popular ones.

Hm... I'll monitor my light leakage in the coming days.

Um...I think you need to re-read the thread. The theory is NOT that the heat causes the gaps. The theory is that when you receive a new notebook, the seal is new and therefore does not fully seal out the light. As usage of the notebook and screen warms, it conforms to the shape of the gap behind the screen better. Over time, as it cycles warming and cooling, the foam/rubber/plastic (or whatever they use) "cures" and forms a better seal.

Kinda like the more recent snowboard boot liners that conform to the shape of your feet and ankles as your body heat warms the foam and makes it more malleable.

I fail to see how "electric fields" or "static" has anything to do with light leakage. You need to have at least a theory that is feasible on a basic physics level. Otherwise, it's just a blind guess.

The theory makes a fair amount of sense to me. I'll check it out myself when I get mine.

No! because i am drunk

The "heat" theory was discussed on another thread.

My "theory" is that an electrical discharge emitted either by the fluorescent lamp itself or the circuity that supplies power to it, perhaps in the form of static, is interfering with the millions of micro-transistors that are on the backside of the LCD panel.

I base this theory on limited experience in "playing" with the fluorescent bulbs from LCD screens in defunct laptops. Recently I had been working out the specifics of a custom fabricated clip-on fluorescent light powered by the USB port, for illuminating the keyboard in the dark.
While testing to see if the 5 volts supplied by the USB2 port would actually power the lamp, I hooked a battery up to it and accidentally completed the circuit simply by TOUCHING the metal capped end of the lamp with my hand.
In other words, the fluorescent lamp illuminated without a completed contact-to-contact closed circuit. In fact, it would dimly illuminate as my left hand was holding one wire from the ballast to the battery, and my other hand DREW CLOSER to the end of the lamp, NEVER TOUCHING IT.
This, through my limited understanding of it all, tells me that the lamp assembly or circuitry must be adequately grounded.

I also gave myself a jolt, stupidly, by being careless and not remembering that I was handling current amplifying circuitry (capacitor). It was a very little one, but as far as delicate circuitry of a laptop goes, I'm sure it could fry something.

I don't pretend to be too qualified for all of this discussion, but it does seem to me that my theory has enough merit to warrant investigation, no?

Edit:
Unfortunately all of my electronics junk is packed away as we are gearing up to move. Otherwise, I would've tested this idea by now.

I have played with the screens of old laptops while they were on, pressing on them, trying to massage out problems, etc. I have never been able to squeeze any part of an LCD screen and have a ghosting or light leakage result from pressing on it that takes up 25% of the screen.

I won't subject my I9200 to such LCD "testing", and I do admit that the screen glass on it is much thicker than on my old Gateways.
However, I have a light leakage on one Gateway that pretty much covers 85% of the LCD, and very pronounced on a 0- 0- 0- bmp.
The Gateway is 9 years old, and the screen has a very loose bezel. (In fact, the whole laptop is quite "floppy"; The last and worst built of the Gateway Solo series.)

I've noticed that about after one week of moderate uses (approx. approx. 3-4 hours a day) at brightness level 3 or 4, that the light leakage in the central portions of my laptop screen has reduced considerably. It's still there and noticable at times, but certainly not to the extent that I saw when I first powered up my laptop. And yes, I did make this observation in a dark room.

However, the edges of my screen still have a white border!

HERE is a site for some decent LCD info.

I could see my light leakage against colored back grounds to, so it REALLY bothered me.

You know what, i was just about to make this same thread! When i first got my screen, there was about an inch of light leakage at the bottom... and now, it's about 1/4th the size.

Thanks for the link. Not that I can understand it, but it is nice to see someone trying to put some constructive info out on the issue instead of the typical mass hysteria.

Ha!

LOL

Yeah, I can imagine:

"in the states samsung light leakage and lg sparkles go away after 21 days, but in canada its after 31 days due to the, uh, eh, them being further north"

So would someone technically competent comment on that link and our chances, and what sorts of light leakage the improvement would apply to and what sorts it wouldn't, ie from the side or the bottom?

That link is about how LCD screens work on a pixel level. It might be helpful if a faulty LCD screen was the cause of the light leakage, but I don't think it is. Let me try and explain.

The backlighting of LCD screens is from a cold cathode fluorescent lamp. They can be on top and bottom, or on the sides of the screen. There's a reflective u-shaped channel cover to direct the light towards the lcd screen and also increasing its apparent brightness. Okay, now let's go through this step by step making some reasonable assumptions and hopefully logical conclusions...

You'll notice that all the light leakage issues all have light leaking from the bottom and/or top. You'll also notice that it's not uniform. However, no one has complained about the screen images being non-uniform, suggesting that the light source itself IS even across the length of the lamp. Otherwise, a blank white screen would also be uneven - I haven't seen any complaints of this.

It's noticed only when the screen is blackened. But we know that the screen cannot be the defect. The reason is because there are two polarizing film layers in the screen that block out all light (they're at perpendicular angles to each other). They only let in light when depolarized and thus light up the individual pixels. If the light all came from behind the screen, it would be pretty much dark. That means the light must be leaking in FRONT of the screen. And the only way it could do this is if there is not a tight enough seal at the edges of the screen.

Look below at a cross section of an LCD screen at one of its edges with the CCFL light source. The asterix is approximately where you would need to have a good seal. This is where I think the light leakage is occuring. This is also why I think the theorized "curing" seal is a reasonable explanation for the seemingly consistently frequent observation of decreasing light leakage AND for the variations in severity. I don't this many people are simply imagining that their light leakage is decreasing. If they're already sensitized to it, there's no way they would find it MORE acceptable later. And if this is the case, that's good news. It just means you gotta break-in your notebook.

Screen surface
---------------*/"""\
--------------- CCFL Bottom edge
<===Light <=== \,,,/


What's funny is that as much as people here are saying it doesn't happen with "higher" brand name screens, it does. Read this Amazon link on the 19" XBrite and search for "leakage".

How do you explain the leakage that is not around the edges? Look at the 2 spots near the top. I see them in movies and graphics too.

Despotes was that picture taken in normal lighting conditions?

Thanks for the info! Mine just shipped, so don't know yet, but how safe would I be to assume that light-leakage will fade? If at the top and bottom, is this always going to be a matter of breaking it in, or is there a way to tell if the seal is too funky to ever fix itself?

If I had to guess I'd say the light leakage will only get much better in time if it wasn't that bad to begin with. If you have what despotes posted above or like that other guys "lung xray" screen then it likely won't improve much.

Normal light conditions--yes.
There is a noticeable reflection on the left side of the screen on the 9300 to the left though.
The picture is what my eyes see. I had to adjust the shutter speed a few times for accuracy.
It's really strange that I seem to be the only one with multiple (4 in a row) 9300's suffering from leakage to this degree.