Font on my AMOLED display has white border I noticed that text on my Galaxy S3 is bad looking.

This is how it should look



And this is how it is looking


On the second image you can see white border around every letter..

But, when I change display mode to Natural or Movie, the border there is not. Is it right? Does it mean that the display is corrupted?

I bought this phone few days ago as used. The phone was made 2 years and 2 months ago but I don't know how long it the previous owner was using. Display is without any scratch, blue colour is okay. The phone is looking as unused.

thanks for help
If i adjust brightness and saturation on your first image:



White border is visible!
It's really hard to say. I think this occurs because the adjustments is very different in each display mode.
Which mode have you used in second image?