CNN had a segment this morning on the University of California's (Irvine) super screen. It is 23 feet wide by 9 feet high with 200 million pixels. It is called a "hiper wall". It is touted as being 100 times sharper than high-definition television.

http://www.cnn.com/video/#/video/tech/2007...ce.hiper.tv.CNN
{Note: Requires flash player to view this video}