Has anyone looked at a 1x1 pixel black/white checkerboard pattern on their HX850? My 46HX850 is interesting to say the least. For example, in the Cinema modes, it has a pronounced green tint that varies with color temperature, which I sort of expected, but there are three purplish half-circles spaced equally along the bottom edge, which simply aren't present in the pattern. You should be able to see them in the picture below. This is with all settings off, or for ones that can't be turned off like "Color", they're at their default values. Given that everything else looks normal aside from the green push, I figure this pattern is a pathological case for the image processing the TV does, but I see the same thing even in Game mode, where the processing is minimal, so I guess it could be some weirdness with the panel. I'm getting the pattern from AVS709HD, and I've verified it in XBMC and also with my standalone Bluray player. I've also created the pattern in a paint program and verified it when viewing the static image full-screen. My PC is connected directly to the TV with HDMI, while the BD player goes through my Pioneer AVR. The TV is set to full pixel, of course, and it's displaying the full 1920x1080 images with no scaling. I do not observe this on my NEC 20WMGX2 monitor connected to the same PC. I do not observe this on my 46EX500, which uses CCFL backlighting, with the AVS709HD "Misc Patterns\D - Resolution\1-Checkerboard Pattern.mp4" on a USB thumb drive plugged into a WDTV Live as the source. I do not observe any anomaly with a true 50% solid gray pattern or any other color pattern.
While I don't see this in normal content, or even other test screens, it's nonetheless disconcerting. I've never see anything like it. It makes me think, "I'm glad I'm not running my old Atari 520ST with its simulated gray monochrome desktop, or the original Mac, which I think used the same kind of pattern." And of course there's the worry that it will show up in real content, even though real content has looked great, and other resolution patterns have looked normal. Any ideas? What do you see on your set? (To be clear, the photograph below is not the checkerboard pattern; it is a photo of my TV screen.)