But if the blue sub was stuck on wouldn't the whole pixel blend in with a blue background? The only colour that this pixel isn't visible on is black... Regardless, I'm still going to try and fix it though, and check with the manufactures.
This is where mikeface was getting into the theory of light.

Say you had a red sheet of transparent plastic you were holding through your face. All the objects that are cyan (that's kinda a blueish green) would be shown as dark or black through the plastic. All you'd see brightly would be the red, and you'd see about half of magenta or yellow objects.

Usually a manufacturer will require a certain number of pixels to be affected.

Roto, I was very interested in this stuff back when I just had a CRT monitor, but it came in handy when I got my macbook and a pixel turned black!