http://en.wikipedia.org/wiki/Ultra_H...finition_Video
Resolution: 7,680 × 4,320 pixels (16:9) (approximately 32 megapixels)
but consider this...
http://en.wikipedia.org/wiki/High-definition_television
Commercial High-Definition television was first developed by Nippon Hōsō Kyōkai, and was unveiled in 1969.[4] However, the system did not become mainstream until the late 1990s.
1080p resolution needs a screen size of over 42in to be useful, most HD screens are 720 line displays, just like SD is good up to 28in or so.