Originally Posted by vilago
I'm about 99% sure that you can't use pixel orbiter in size 1. Whatever one results in full picture with no "trimming" automatically disables the pixel orbiter regardless.
You definitely seem to be able to use the pixel orbiter in "Size 2," which is the no overscan mode. It will end up leaving strips of black pixels around the edges since there's no content there. You can test this with an image that has thin white lines around the edges (make a 1920x1080 image with a pixel or 2 of white around the edges). You'll see those edges appear and disappear as the orbiter works. I did this straight off a laptop because I knew I could control the screen resolution and overscan that way, not sure if there's any overscan in the built-in photo viewer or not.
The real problem with the orbiter is that it's more of a marketing trick than an actual prevention; the orbiter only moves the images on screen by a few pixels, which is far smaller than most of the things that can potentially get stuck (channel logos, game UI elements, these are all much larger than the number of pixels of movement you get). This means that instead of preventing IR it just blurs it, so you end up with a fuzzy channel logo or whatever.
The amount of IR on the ST50 really surprised me. I'm coming from a Pioneer 5080HD (might be unfair to compare anything to a late generation Kuro, but it's been years now) and I've never seen IR like this on it. You can produce IR on the Pioneer but it takes longer and most importantly vanishes within a span of minutes, compared to hours or even days on the Panasonic. It's unfortunate because otherwise the picture quality is excellent, and I consider the black levels to be good even coming from a Pioneer. Nothing's been permanent, but I've had IR already that takes a full day of dynamic content to wipe out. And I put 300 hours on the set before I even let it near station logos and game UI's. I can see this being a problem if you frequent the same channels with the same logos; they may continue to reinforce the IR faster than it gets wiped if you have some favorite channels with logos. It may indeed get better with age as the panel chemistry settles down a bit, but of course that's something you can only test long past any return period.
Oh, and just a note for the person thinking of swapping to a Samsung: The general consensus is that only the 60+ inch Samsungs perform better with IR than the Panasonics. Apparently on Samsung's lineup the sub-60 panels are all around worse in quality. The 51-inch models also apparently have far worse blacks. I can't confirm any of that but I've seen it discussed in a number of places.