We enhanced the resolution characteristics of a threedimensional (3D) image using time-division multiplexing methods in a full-parallax multi-view 3D display. A time-division light-ray shifting (TDLS) method is proposed that uses two polarization gratings (PGs). As PG changes the diffraction direction of light rays according to the polarization state of the incident light, this method can shift light rays approximately 7 mm in a diagonal direction by switching the polarization state of incident light and adjusting the distance between the PGs. We verified the effect on the characteristics of 3D images based on the extent of the shift. As a result, the resolution of a 3D image with depth is improved by shifting half a pitch of a multi-view image using the TDLS method, and the resolution of the image displayed near the screen is improved by shifting half a pixel of each viewpoint image with a wobbling method. These methods can easily enhance 3D characteristics with a small number of projectors.
In recent year, the Head-up display is studied actively. Among them, 3D HUD attracts rising attention. In HUD application, it is assumed that stereoscopic image is displayed at far distance. Super Multi-View display provides a smooth parallax. Even if 3D image is at far distance, it be able to display 3D image which has appropriate depth. In previous studies, high resolution required for SMV. However, there are restrictions to increase the resolution. Therefore, we propose a novel SMV display using time division multiplexing and eye tracking techniques. Our new system is not required high resolution display. The proposed display consists of DMD and light source array. The ray from the light source array is reflected at DMD, and form an image at the vicinity of the pupil. The position forming an image depends on light source position. The image which is display on the DMD is changed corresponding to the focal point. To confirm the principle of the proposed method, we experiment about creating a viewing zone only in the vicinity of the pupil. From the result, we confirmed 8 viewpoints in the horizontal direction at 18.8 mm viewing zone.