Abstract: An apparatus for displaying on a display screen a first image sequence exclusively to a first viewer and a second image sequence exclusively to a second viewer, the first image sequence including a respective plurality of image frames and the second image sequence including a respective plurality of image frames. A controller alternately displays in an interlaced fashion each of the image frames of the first image sequence and each of the image frames of the second image sequence on the display screen. The controller also generates a second viewer image block signal when each of the image frames of the first image sequence are displayed and a first viewer image block signal when each of the image frames of the second image sequence are displayed.