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ZScreen is a push-pull electro-optical liquid crystal modulator that is placed immediately in front of the projector lens or computer screen to alternately polarize the light from each video frame. It circularly polarizes the frames clockwise for the right eye and counterclockwise for the left eye.

The RealD 3D system now showing in theaters is using the ZScreen that was invented by Lenny Lipton.

See also[edit]


  • US patent 7477206, "Enhanced ZScreen modulator techniques", issued January 13, 2009, assigned to RealD 
  • US patent 6975345, "Polarizing modulator for an electronic stereoscopic display", issued December 13, 2005, assigned to StereoGraphics Corporation 
  • US patent 5481321, "Stereoscopic motion picture projection system", issued January 2, 1996, assigned to Lenny Lipton 
  • US patent 4884876, "Achromatic liquid crystal shutter for stereoscopic and other applications", issued December 5, 1989, assigned to Lenny Lipton 
  • US patent 4792850, "Method and system employing a push-pull liquid crystal modulator", issued December 20, 1988, assigned to StereoGraphics Corporation 
  • US patent 4523226, "Stereoscopic television system", issued January 19, 1983, assigned to StereoGraphics Corporation 

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