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Whenever there is a non-black solid color block in any application I can see tiny "watermarks", a pattern, and I don't even need to get close to see that.

The effect is more visible in lighter colors. The dark spots have more than 2 pixels in each dimension and they appear to be blue-ish.

Is it because of the Pen-Tile LCD configuration? Is my device defective?

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It's likely the matrix which you are seeing.

The Galaxy Nexus uses the RGBG matrix just like previous galaxy, however it's much higher resolution than many other pentile displays.

Here's a magnification of another, similar screen from a different samsung phone.

If that's not what you're seeing then it may be a hardware issue.

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