LCD sub-dead pixel question

Oops, just re-read the original, I think I've answered a slightly different
question!

"Andy Cunningham" <asc99c.DeleteThis@hotmail.com> wrote in message
news:bdsn24$pne$1$8302bc10@news.demon.co.uk...
 > This is a current topic being taken up with manufacturers. To get the
full
 > colour displays, a light must be passed through coloured filters.
Following
 > this, components of the light are blocked out selectively to create a full
 > coloured pixel. So rearranging your name for it we have dead sub-pixels,
 > which are indeed not always covered by the various returns policies. If
it
 > looks OK, keep it - no point being difficult for difficulties sake.
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: LCD sub-dead pixel question 

"Andy Cunningham" <asc99c.DeleteThis@hotmail.com> wrote in message
news:bdsn24$pne$1$8302bc10@news.demon.co.uk...

 > coloured pixel. So rearranging your name for it we have dead sub-pixels,
 > which are indeed not always covered by the various returns policies. If
it
 > looks OK, keep it - no point being difficult for difficulties sake.

Yep, dead subpixels is the name. Meaning that one or two of the three
red-green-blue subpixels that make up an entire pixel, is dead.

Yes, it's normal. Yes it's annoying. And it can hardly ben prevented.
Chances are that a replacement screen has more dead (sub)pixels or has them
in more annoying places.

For an excellent review of what dead (sub)pixels are and how manufacturers
deal with them (because there _are_ policies and guidelines for it), read
the following article on Toms Hardware pages:

<a style='text-decoration: underline;' href="http://www.tomshardware.com/display/20030319/index.html" target="_blank">http://www.tomshardware.com/display/20030319/index.html</a>

Regards,

Edo Nijmeijer<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: LCD sub-dead pixel question 

Thanks for everyone's help. Though, I believe people misunderstood me as the
pixels in question are _not dead subpixels. The subpixels in question
actually work fine (i.e., they _will turn on or off, or most levels in
between). However, when they are asked to turn off, they don't turn all the
way off, but only 95% dark. Second is the fact there are about fifty of
them.

Thanks,
-Brian

"The Number 23" <thenumber23.DeleteThis@hotmail.com> wrote in message
news:5ekMa.893$3h3.2003@rwcrnsc53...
 > Hello. I just bought a Cornea CT1810 LCD monitor and noticed an odd
artifact
 > which I've never seen before on other LCD's. I'll call them sub-dead
pixels.
 >
 > Here's what I mean. On a black screen, there are on the order of 50
visible
 > pixels that are not black. They are either very dark red, green, or blue.
I
 > have to squint to see them. However, the respective pixels aren't dead, as
 > if I paint a red, green, or blue box over any of them, the newly-painted
box
 > will be correct - no dead pixels. So, it's as if the pixels can't be made
to
 > turn fully black when they're asked to.
 >
 > Is this a somewhat normal occurrence for LCD monitors? I'm inclined to let
 > it go because the picture is so vibrant and syncs perfectly to my
videocard
 > (analog VGA).
 >
 > Thanks,
 > Brian
 >
 > P.S., I have a second Cornea CT1810, and even though they are the same
 > model, there are differences between the backlighting, AC adaptor, and
other
 > settings. Weird...
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: LCD sub-dead pixel question 

On Thu, 03 Jul 2003 17:44:25 GMT, "The Number 23"
<thenumber23 DeleteThis @hotmail.com> wrote:

 >
 >Thanks for everyone's help. Though, I believe people misunderstood me as the
 >pixels in question are _not dead subpixels. The subpixels in question
 >actually work fine (i.e., they _will turn on or off, or most levels in
 >between). However, when they are asked to turn off, they don't turn all the
 >way off, but only 95% dark. Second is the fact there are about fifty of
 >them.
 >
 >Thanks,
 >-Brian

Well, after reading your original post it sounds like you are talking
about stuck sub-pixels which is not the same as dead pixels. I have
one stuck on blue in the centre of my screen but because a sub-pixel
is one third the size of a pixel it is not an issue for me. But if you
have 50 then I would return it pronto. That is unacceptable IMO.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: LCD sub-dead pixel question 

On Wed, 2 Jul 2003 11:31:23 +0200, "Edo Nijmeijer"
<swiv98 DeleteThis @hotmail.com> wrote:


 >Yep, dead subpixels is the name. Meaning that one or two of the three
 >red-green-blue subpixels that make up an entire pixel, is dead.
 >
 >Yes, it's normal. Yes it's annoying. And it can hardly ben prevented.
 >Chances are that a replacement screen has more dead (sub)pixels or has them
 >in more annoying places.

A dead pixel is one that won't turn on or off. A *stuck* sub-pixel is
one that is stuck on a specific colour, which is what I think he is
talking about. I have one in the centre of my screen that is stuck on
blue, but because a sub-pixel is very small it's not an issue for me
and is only ever noticable when the area uses no blue, like black for
instance.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: LCD sub-dead pixel question 

Thanks for the info, though it's not a stuck sub-pixel, since the pixel
actually performs much of its function. I'll give an example.

Pretend I have two blue subpixels next to each other. The first one is fine,
but the 2nd one exhibits the problem. Here's what I see:

I create a black screen so problems will be easily visible.
Set both subpixels to 100% blue: Both subpixels appear 100% blue.
Set both to 50% blue: Both subpixels appear 50% blue.
Set both to 0% blue: The first subpixel appears 0% blue, but the 2nd one
appears approximately 4% blue.

This is the problem I have with approximately 50 subpixels. I have other
monitors with true stuck and broken subpixels -- these are normal and
expected in all LCD monitors. This un-dead pixel thing, though, is a new
phenomenon that I've never seen before.

Thanks,
-Brian


"Peter Parker" <pp RemoveThis @here.invalid> wrote in message
news:l18bgvguacn8ronpo75qqbg8l79l67s0l4@4ax.com...
 > On Thu, 03 Jul 2003 17:44:25 GMT, "The Number 23"
 > <thenumber23 RemoveThis @hotmail.com> wrote:
 >
  > >
  > >Thanks for everyone's help. Though, I believe people misunderstood me as
the
  > >pixels in question are _not dead subpixels. The subpixels in question
  > >actually work fine (i.e., they _will turn on or off, or most levels in
  > >between). However, when they are asked to turn off, they don't turn all
the
  > >way off, but only 95% dark. Second is the fact there are about fifty of
  > >them.
  > >
  > >Thanks,
  > >-Brian
 >
 > Well, after reading your original post it sounds like you are talking
 > about stuck sub-pixels which is not the same as dead pixels. I have
 > one stuck on blue in the centre of my screen but because a sub-pixel
 > is one third the size of a pixel it is not an issue for me. But if you
 > have 50 then I would return it pronto. That is unacceptable IMO.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: LCD sub-dead pixel question 

On Fri, 04 Jul 2003 16:19:53 GMT, "The Number 23"
<thenumber23 RemoveThis @hotmail.com> wrote:

 >
 >Thanks for the info, though it's not a stuck sub-pixel, since the pixel
 >actually performs much of its function. I'll give an example.
 >
 >Pretend I have two blue subpixels next to each other. The first one is fine,
 >but the 2nd one exhibits the problem. Here's what I see:
 >
 >I create a black screen so problems will be easily visible.
 >Set both subpixels to 100% blue: Both subpixels appear 100% blue.
 >Set both to 50% blue: Both subpixels appear 50% blue.
 >Set both to 0% blue: The first subpixel appears 0% blue, but the 2nd one
 >appears approximately 4% blue.
 >
 >This is the problem I have with approximately 50 subpixels. I have other
 >monitors with true stuck and broken subpixels -- these are normal and
 >expected in all LCD monitors. This un-dead pixel thing, though, is a new
 >phenomenon that I've never seen before.
 >
 >Thanks,
 >-Brian

Nor have I. I would call the manufacturer and get an RMA.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: LCD sub-dead pixel question