Talk about ambitious design. Panasonic showed off a 20-inch tablet at CES 2013 in Las Vegas today that features four times the resolution of a 1080p HDTV, accepts pen input from a stylus and runs Windows 8 Professional. Morea concept than an actual product, the tablet does show that 4K or Ultra HD technology can shrink (from th 60"-80" HDTVs around) and can easily take multi-touch input as well as pen input. The 20-inch LCD panel delivers "4k" resolution (3840 x 2560, 9.83 million pixels), more than twice the horizontal and vertical resolutions of Full HD (1920 x 1080) and has a density of 230 pixels per inch. How long before we see 4K capable 7 and 10-inch tablets?