Stereoscopic 3D glasses that are used with "active 3D" computers and TVs. The glasses use liquid crystal lenses that act as shutters, alternately opening and closing the view to the screen.

This circuit is how [John Tsiombikas] makes his cheap 3D shutter glasses work with a Linux machine. It’s not that they were incompatible with Linux. The issue is that only certain video cards ...

(1) See LC shutter glasses. (2) A method of directing light onto the drum in an electrophotographic printer. A matrix of liquid crystal dots function as shutters that are opened and closed.

The big names are usually doing the polarized glasses or shutter glasses. “it was nice not wearing glasses”… yeah, I know, I’m wearing glasses.