What does a dead pixel even Look like ?

I posted a thread 24 hours ago that ended up w/ a missing section, then 2 replies to finish.... a real mess that went deservedly unanswered.
I'm sure I can do better :
Suddenly I've got 2 "bits of dust" towards the lower right corner of my 24" display. They're different sizes ( the smaller close to a pin-head ) and the slightly larger one is a much darker shade of grey. They're also roughly-edged...misshapen.
They look like pieces of grit , is it even possible for a foreign particle to "ride in on a CD" and end up visible within the display ?
I'm sure that's doubtful, but I don't know much beyond what they "look like"
I've tried the Pixel-Fixer widget, but have seen no effect.
I'd just like to hear what else others may have had, the better to determine what these interlopers actually are !
thanks, Dave

DmR of AtoZ wrote:
They look like pieces of grit , is it even possible for a foreign particle to "ride in on a CD" and end up visible within the display ?
The LCD is a sealed unit before it's placed in the computer so no it's not possible for foreign particles to "ride in on a CD". It may be possible for dust to get under the "glass" that covers the LCD, but again, not from a CD.
I'm sure that's doubtful, but I don't know much beyond what they "look like"
Apple has a decent article on pixel anomalies. In order to keep LCD costs down, a certain number of pixel anomalies are considered "acceptable" by most manufacturers. Some resellers offer a dead pixel warranty for an extra cost. They lose money with individual LCDs that are returned with pixel anomalies that are considered "acceptable" (the manufacturer would bill them for repair or replacement) and usually sell them at a reduced cost. In the long run, though, most LCDs don't have pixel anomalies so the more dead pixel warranties they sell, the more profit they make.
I've tried the Pixel-Fixer widget, but have seen no effect.
Software like the Pixel-Fixer widget are often just temporary solutions. Stuck pixels usually indicate a hardware issue with the LCD matrix and the only guaranteed way to make sure they're gone is to replace the display.
This picture mistakenly refers to a "bright" pixel as "dead". When the pixel is stuck in an open position (allowing light to pass through) it's a "bright" (sub-)pixel. When it's stuck in a closed position (blocking light from passing through) it's called a "dark" or "dead" pixel.
This picture shows a dead (or "dark") pixel.
Hopefully that clears some of your questions.

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