jap this is called overscan and happens with all RPTV's. Think of the image like a movie theater screen and the image doesnt quite fit and bleeds onto off the screen. Same principle. The three lenses are projected onto a large mirror and then projected onto the screen which results in "overscan" This is normal also for "Native" resolutions.
You can have the screen isf calibrated which will help to some degree, but unless you get a fixed display, like Plasma or LCD it just comes with the territory. I have a Pioneer Elite 620 58" that is 7 years old and it does a better job at overscan than my parents 2 year old 52" RPTV, all TV's deal with overscan differently, but is present in all of them.