Hitachi demonstrated a high-resolution 6.6" transmissive IPS LCD display that offers an impressive 302 pixels per inch density. The screen has a resolution of 1600 x 1200 pixels and Engadget speculates this panel may be used by Apple for an upcoming 7" iPad tablet. The screen offers 400 nits of brightness and has a 800:1 contrast ratio.
This little beauty throws 1600 x 1200 pixels across a 6.6-inch transmissive IPS panel for an amazing 302 pixels per inch density. That's just shy of the 326 ppi density seen on Apple's 3.5-inch Retina Display (and now Sharp IS03) and blows away the 132 ppi density of the iPad's 10-inch 1024 x 768 IPS panel or 169 ppi density of the 7-inch 1024 x 600 pixel Galaxy Tab and BlackBerry PlayBook.