Thanks for the informations.
Indeed, partial washout explains better my "problem".
I tried to enhance the contrast, with some improvement.
Refresh the screen also helps, but not completely.
It is difficult to render the problem in pictures... anyway, I attach two pictures in order to show the difference:
* contrast 2: a book that shows good;
* contrast 5: a book that has the problem.
A short video I also tries to show the washout.
As @EastEriq says there is probably nothing more to do. I just wanted to make the post more meaningful.
Best regards.
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