I see the exact same thing on my E43-F1. I posted a question about this the other day, not knowing what to call it. Had I known this, definitely would not have purchased this model. If you care about image quality using as PC monitor, do not go with this choice. The cross-hatching or dithering effect can be seen in most solid colors and almost any gradient.
Is this noticeable when sitting around 5 feet away?