Does anyone know how does correlation between time and occurrence of bad pixels in LCD look like? I mean I assume that there is correlation (the longer you use LCD – the greater probability of having bad pixel) but is it linear or it’s more like: if you are to have defective LCD matrix - it’s more likely that you get bad pixel during first 6 months of using LCD (it’s only an example). When did bad pixels in your LCDs appear?

Isn't it "out of the box" bad pixels? Or probably I'm just lucky with my monitor, zero dead piels so far.

I've got a Sony PSP, Sony BRAVIA TV (40"), Seiko LCD-based laptop (16"), Sharp TV (22"). Never seen a single "dead pixel", at this point a consider it more as a urban legend than a real-life issue :-P

I've never had a dead pixel on my many screens either, but I'm not so sure that there is a correlation between time and pixel failure. I think it's more of a problem during the making of the LCD, or a mistreatment during use like applying hard pressure on the screen. I don't have any proof to back this up, but liquid cristal displays have been used for literally decades, and my good ol' watch I had when I was a kid is still working properly. Our modern LCD matrixes are based on the same technology, only with much, much more pixels (hence the risk of having a few defective pixels in the matrix, due to the success ratio of the making process).

Out of the 6 LCD screens I've ever owned, I've only had one with a stuck pixel, and it was like that out of the box.

It's barely noticeable most of the time, only really shows up in dark scenes.

There is no correlation.
It is true that the biggest chance of you finding some is just after you bought the screen, but this is really the same for any piece of equipment. If something went wrong during the manufacturing process you'll usually find it when you first start using it.
After that initial period you're just talking regular wear and tear and the products life expectancy.
Either you'll get a dead or lazy pixel or you won't. Luckily the production process has improved so much that they're getting pretty rare.
If you do get one and you're like me though, it'll irritate you so much you can't even use the device without noticing it.

My Sony monitor I've been using for 7 years or so has one stuck pixel. And it had that out of the box. It's rarely noticeable.

It follows a hypergeometric curve - if pixels are going to fail then they are likely to do so early on if not right out of the box.

Of course that's just for dead caused by latent defects. Problems caused by physical damage, naturally, can occur whenever damage is caused. Eventually there's also wear-and-tear, but that's very long-term if you treat your belongings well.

I meant the curve of an hypergeometric probability distribution. I guess it's been too long since I worked with this stuff, so I might be a bit muddled. The probability of failure approaches zero asymtotically. It looks similar to an hyperbolic curve, except that there is no vertical asymtote.

Basically you start from the left with line moving right and down toward the x-axis but never actually reacing the axis.

My LCD I'm using right now has a single dead pixel since I purchased it (a couple of years already). I wondered why it wasn't listed as "feature" on the box :P
Never bothered to RMA it since it's hardly visible.

I can tell you that if you're punching hard enough on it, you'll see those dead pixels eventually :P (never did that personally but have seen some people do it)

They probably wouldn't have let you since every company that produces LCD displays allows for an 'acceptable' number of defects. For example I think Sony wouldn't give you a replacement unless you had a minimum of 9 dead pixels of which 3 had to be adjacent or something like that. Which is part of the reason why stores made a small fortune with 'dead pixel insurance', they were gambling on the rarity of the situation and the fear of consumers.

True true... I forgot that. There's a threshold for dead pixels to warrant for a RMA yeah. But my warranty on this screen is running out sometime soon I guess, I'm afraid of how we'll dispose of all those Liquid crystals though without poisoning a few hundred species...

I got an ACER monitor recently and it had 9 dead pixels (no joke). RMA'ed the sucker, new one had 0. Very easy to spot and annoying. But if you have them its usually right when you first turn it on, unless you damage it.

The monitor I am using now had dead pixels, two or three to upper left side.

Oddly enough they "came back to life" with time. Had anyone told me this was possible before I saw this happen I would laugh.

I tested it with the dead pixel buddy. It was pretty visible. A whole colored screen with two or three black dots.

No, I am not an idiot, it wasn´t dirt.