Ceiling-mounted projectors use radio signals rather than IR (see RF shutter glasses). By supporting 120 frames per second (fps), active 3D glasses deliver the full resolution at 60 fps to both eyes.

Lattice HDR-60 Video Camera Development Kit Equipped With Lattice Dual-Sensor Board and Helion ISP Pipeline Shows 3D Images With Active Shutter 3D Glasses HILLSBORO, OR, Feb 29, 2012 (MARKETWIRE via ...