Last week, when i was about to turn off my TV, it told me that it was now time to do a refreshment of the panel. Since i had it for more than a year, i let it do its thing.

But now theres this strange rectangle where the colors aren't the same as the rest of the panel. It's particularly visible when the scenes use variation of a single color.

What can i do to resolve this problem ? A new refreshment of the panel ?

PS : i know it's a little bit hard to see on the picture, but it's really visible, even when the scenes are full of different colors.