Can LCD pixels turn dead over time?

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intx

There's a rumour going on that LCDs that don't break within the first month
or so are likely to last, because of no moving parts..

That being said, is it possible for a LCD to not have dead pixels for a
week, only to have them appear afterwards?

Thanks,
Ken

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intx said:
There's a rumour going on that LCDs that don't break within the first month
or so are likely to last, because of no moving parts..

That being said, is it possible for a LCD to not have dead pixels for a
week, only to have them appear afterwards?
Click to expand...

I know that Plasma monitors definately get worse over time. I can't say
that I've ever seen an LCD display degrade over a few years though. The
biggest failure for an LCD monitor is the backlight. Next would be the
interconnection between the LCD and driving hardware.
 
There's a rumour going on that LCDs that don't break within the first month
or so are likely to last, because of no moving parts..

That being said, is it possible for a LCD to not have dead pixels for a
week, only to have them appear afterwards?

Thanks,
Ken
Click to expand...


yes it's possible but not common, generally they'll just
(all) get progressively darker over a period of time
 
yes it's possible but not common, generally they'll just
(all) get progressively darker over a period of time
Click to expand...

Id like to know how long the avg LCD panel lasts in a practical sense.

Im getting conflicting info in articles and posts. I assumed they
lasted forever since they dont get worn out like CRTs. And then I
read some articles about how CRTS they lose sharpness focus and
brightness over time. And how they measure the halfway point --- if
its half as bright or something on CRTs and how LCDs their halfway
point is longer. The backlight they say - the UV rays eventually
destroy parts of the backlight reducing the brightness.

However then I came across all these posts that say LCDs mainly due to
the backlight dont last that long - maybe 3 years or so. I noticed
most have 1-3 year warranties. Some have 3 year warranties with 1 yr
backlight warranties. That doesnt necessarily they will last 3 yrs or
less though - but Id like to know on avg how long does one last?

CRTs though many can actually stop working between 3-5 yrs , many seem
to last forever -7-8 yrs though they might have lost most of their
brightness and perhaps are fuzzier.
 
intx said:
There's a rumour going on that LCDs that don't break within the first month
or so are likely to last, because of no moving parts..

That being said, is it possible for a LCD to not have dead pixels for a
week, only to have them appear afterwards?

Thanks,
Ken

** REMOVE 'HUCKLEBERRY' from the E-MAIL at the top when REPLYING **
Click to expand...
Rumor? More than that -- it is well known in the industry that
electronics with no moving parts are likely to last if they get past an
initial period of operation. These early failures are normally called
"infant mortality". Notice that I said "no moving part" though. Anything
that moves is more prone to failure which is why even the best hard
drives are more likely to fail that a cheap stick of RAM.

BTW, yes, LCDs can develop bad pixels over time since with the vast
number of them on a display and the amount of actual circuitry involved
even a vanishingly small failure rate will sometimes strike. For
example, I'm looking at a Viewsonic VP171b on the desk in front of me
which was absolutely flawless for at least 9 months after purchase but
which as now developed a single red pixel which is permanently stuck in
the on state. This pixel first became intermittently on then full on
over a period of several weeks.
 
BTW, yes, LCDs can develop bad pixels over time since with the vast
number of them on a display and the amount of actual circuitry involved
even a vanishingly small failure rate will sometimes strike. For
example, I'm looking at a Viewsonic VP171b on the desk in front of me
which was absolutely flawless for at least 9 months after purchase but
which as now developed a single red pixel which is permanently stuck in
the on state. This pixel first became intermittently on then full on
over a period of several weeks.
Click to expand...

Now thats the first time Ive heard of that. That would annoy the heck
out of me if there was a red or blue stuck pixel in the middle of my
screen.

I would think that would happen more with physical damage. You know
bumping into the screen, cleaning the screen, moving the screen. The
front of it feels flexible even with a gentle touch.

I wonder if thats due to normal processes or if extremes in humidity ,
temperature etc are the prime causes?
 
Now thats the first time Ive heard of that. That would annoy the heck
out of me if there was a red or blue stuck pixel in the middle of my
screen.

I would think that would happen more with physical damage. You know
bumping into the screen, cleaning the screen, moving the screen. The
front of it feels flexible even with a gentle touch.

I wonder if thats due to normal processes or if extremes in humidity ,
temperature etc are the prime causes?
Click to expand...

Look at it like this: an LCD screen contains upwards of one million
pixels. One hot pixel is a failure rate of one part per million (more
or less), or .0001 percent, or a reliability of 99.9999 percent. There
are few processes that come near this level.

Q
 
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