3D display system with the fixed parallax barrier that enables the observation in both portrait and landscape modes suitable for smartphones and tablets

The tablets and the smartphones are commonly used in both portrait and landscape modes. In order to apply 3D displays in those devices, the angle of the parallax barrier needs to be matched correspond to the screen orientation. Thus, the display configuration becomes complicated since we need to use the active parallax barrier switchable between two barrier patterns previously. Therefore, in order to simplify the configuration of 3D tablets or 3D smartphones, we propose the 3D display with the fixed parallax barrier that enables the observation of high-quality 3D images in both portrait and landscape modes. First, we propose the method of designing the fixed parallax barrier that can be used in both portrait and landscape modes with low-crosstalk and without moire. Next, we propose the method for rendering stereo images corresponding to the screen orientation and the viewer's position. In addition, the eye tracking system with the 3D camera determines the screen orientation and changes the rendering method according to it so that the 3D images can always be observed in both portrait and landscape modes. To verify the effectiveness of the proposed method, we constructed the prototype system using the tablet with 3D camera and the parallax barrier of the slanted angle of 45 degrees. And we confirmed that the system can display high-quality 3D images with the crosstalk ratio of less than 4% in both portrait and landscape modes.