Perhaps our eyes are just too untrained for such tasks, but we didn't much miss the 24ppi or so difference between the iPhone 4's retina display (326 ppi) and Hitachi's 6.6-inch IPS panel (302 ppi). The CEATEC prototype panel is just gorgeous and crystal clear (as much as Shakespeare and Kanji-laden articles can be, at least). Unfortunately, we couldn't find anyone to answer our questions as to when it might hit mass production, so for now, just enjoy the view.
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Hitachi 6.6-inch / 302ppi IPS panel eyes-on