gray rectangles

Just kidding about the second part. But what Pioneer has
done is just as amazing. Its latest Kuro prototype, unveiled at CES, can turn
the screen completely black while its running.

Why is this a big deal? Contrast is the most important
aspect of picture quality. A big difference between light and dark in a picture
heightens the appearance of detail and the richness of colors.

I can say with certainty that youve never seen anything black
on a modern TV screen. If you dont believe that, just watch TV in a dark room
and wait till the screen fades to black between scenes or before a commercial.
The black screen is actually gray and probably gives off enough light to
illuminate the room. (Old-style CRTs can get pretty close to complete
black—which is why some videophiles originally mourned their demise.)