I've seen this described as "clouding" or "mura" or "flashlighting" on AVS forums. Cheap LCDs aren't the only ones that exhibit this... Sony's highest end LCD (XBR2/XBR3) had problems with this for ...

I am using an older Dell Ultrasharp 20in LCD and I turned the computer off but my background was still displayed! The other monitor went black, but this one stayed on all weekend. I tried again and it ...