Bright White Pixel on LCD - But NOT Visible on Black Background

Hi All,
Just noticed today on my macbook pro (Early 08 - july manufacture) that a small white spot has appeared. Not the blobby large spots that were common lcd problems before on older models, but almost a pinprick of a white spot.
Now its not a dead pixel, since its not black, and its not a stuck pixel, since it has no definite visible colour, also, it is NOT visible on a black background (is this due to the way LED backlights work???) so i dont think its a HOT pixel exactly...it is most visible on plain white backgound - but on any colour R/B/G it is visible as a spot that is brighter than the other area around.
...so...what is it, how can i find out what it is? and might warranty help (presumably for one pixel = no)?
What might i try? Anyone else have experience of this? Every other forum post forum either talks about: 1) dead pixel that si ALWAYS black 2) Pixel that is always white but even on black background 3) coloured pixel - none of which i have exactly, my white pixel is NOT at all visible on black background.

Hi:
I just want to tell you that my Macbook Pro is the same as yours, at it presents that small white spots problem.
In fact, let me tell you all, that those are not dead or stuck pixels, is a problem on the LCD itself, the pixels on that spots are lighter than the other pixels, that's why they look white, but they are not white. They are a lighter color than the other pixels. But again, those are not pixels, in fact they are a group of pixels, from 6 to 13 pixels eash one. Also you can notice like hairlines with the same issue.
My white spots are on the left side of the screen, y 4 of them.
Also, my screen haves particles inside.
I will take my laptop to the apple service senter, and it doesn't matter what they say, they will have to exchange my screen.

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