Panasonic Plasma TV models feature a pixel orbiter, which helps reduce image retention. The pixel orbiter is available in all picture modes except for THX mode. However, please be aware that leaving a still image on the screen for an extended period can cause screen image retention, so it's important to avoid doing so to protect your TV's display.
Not all Plasma TVs have THX mode. The pixel orbiter is a menu item in current models. In earlier models the feature was automatic and did not appear in the menu.