Special glasses to view 3D movies have been around for decades, almost representing a bad theatrical cliche — rows of eyeglass-clad teens screaming, for instance, as an ax from the latest slasher film comes bolting out of the screen. Now, Toshiba is taking the glasses off. At CES this week, it introduces an LCD 3D display that dispenses with the glasses at a 120 Hz refresh rate. “Toshiba will demonstrate concept models of glasses-free 3D notebook PCs and of tablet PCs running the Android and Windows operating systems,” said spokesperson Eric Paulsen.