I think I know how this happened. I was quite wrong earlier. There are bad screens. But, these screens can be fixed in software, although we have no confirmation that this does not come with a quality loss. I think that Apple shipped certain displays that were either of inferior quality to others or were improperly calibrated/defective in their decoding of image data, specifically gamma. So, if the source is changed, the problem all but disappears in afflicted displays. But, the issue really is in hardware, despite being fixable in software. Does that make sense to anyone but me?
No one has said it's fixable with a software update. I do not think its feasible. Will be glad to rescind this comment if I'm proven wrong though.