When does pixels die?

[Guest]

I know there are difficulties getting every transistor to work when a lcd panel is manufactured. But is there any chance a pixel can die due normal usage when the consumer is using the LCD? Anyone who has a monitor with dead pixels, which were working when you bought the LCD?

//zoole

 

[flamethrower205]

During production, there is a certain probability that certain pixels will be dead (a year ago I had a little forumla for it, but that was back then's technology), but dead pixels will not form from use. That is assuming u don't touch teh monitor to get the rippled effect.

Sig of the week.

 

[GoSharks]

Can a pixel die during use, yes! However it is a rare occurrence. If a row or column driver should fail it is possible to have an entire row or column go bad.

Not certain what Flame means by a formula (nor do I care)? I’ve never heard of a formula to predict electronics dead pixels. There are plenty of formulas that show how low a percentage a few dead pixels are in relation to the amount of transistors on a panel, however this is for the most part just marketing speak.

The way panels are made today is not much different than a year ago. Yes there are different technologies, however the process is basically the same.

Jim Witkowski
Chief Hardware Engineer
Cornerstone / Monitorsdirect.com

Jim at http://www.monitorsdirect.com

 

[flamethrower205]

The "formula" was basically just a measure of the number of pixels, then multiplied by a constant %. However, this seems to have changed. It does seem that the number of dead pixels in panels has gone down for quite a few LCD's.

Sig of the week.

 

[GoSharks]

Want to find your dead pixels? Check out my new CRT / LCD monitor test. No download required.

<A HREF="http://www.monitorsdirect.com/toolkit/" target="_new">MonitorsDirect Toolkit</A>

Your comments are welcome




Jim Witkowski
Hardware Engineer
<A HREF="http://www.monitorsdirect.com" target="_new">MonitorsDirect</A>

 

[flamethrower205]

It's very nice. I think though that for teh ghosting one, the box should start out moving at the speed it is, but go faster, b/c often things will be faster than that, and there wasn't really any ghosting w/ the boxes at that speed on my 40ms response time TFT7020. Also, (I find this usually helps) set some sort of design on teh box, so u can see how distorted it gets when it's moving.

Sig of the week.