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We have previously proposed eye tracking system to expand viewing area in all directions for glasses-free 3D display. In this system, since the parallax barrier was fixed, the viewing zone was expanded by image processing corresponding to the viewing position. Thus, there was a limit to expanding the viewing zone only by image processing. On the other hand, we can expand the viewing zone by applying an active barrier that changes to the optimum barrier pattern corresponding to the viewing position by eye tracking. However, to change the active barrier pattern, complex calculation and a specially designed active barrier LC panel are required. To overcome this problem, we propose a novel control method to expand the viewing zone of stereoscopic 3D displays with active parallax barrier in depth direction. The proposed method is the combination of the simple generation method of a barrier pattern and the synthesis method of Left/Right synthetic image corresponding to the viewing position. In this method, let the optimum barrier pitch be Bp at the viewing distance d, we set the barrier pitch to x*Bp and synthesize the Left/Right image so that crosstalk is low at the same time at the viewing distance d/x. To verify the effectiveness of the proposed method, we measured the crosstalk of the prototype 3D display. The crosstalk ratios at the optimum viewing distance 1092 mm (d), 774 mm (d*3/4) and 546 mm (d*1/2) were 4.28%, 3.82% and 5.02%, respectively. Therefore, low crosstalk 3D images could be observed.
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