LCD artifacts
The LCD displays artifacts on the vertical borders of high contrast areas, where bright stripes a pixels or two wide intrude onto the other side. It's constantly changing, and rather noticeable with 10 of them happening at the same time in a single word.
It looks like a localized phase artifact, kind of like this: http://www.lagom.nl/lcd-test/img/clockphase-wrong-2.gif , but not visible on a uniform background.