In 3D displays based on parallax barriers, active parallax barriers that can change the barrier pattern according to theviewing position have been proposed to expand the viewing area. However, the production cost increases because theactive barrier requires a special LC panel. Therefore, to lower the cost, we propose a glasses-free stereoscopic displayusing an active parallax barrier of an LC panel with the same specifications as the image LC panel. The ideal image patterncannot be formed because the minimum control unit of the LC panel is equal to one subpixel. However, by using an imagecycle pitch method (ICPM) that periodically increases the horizontal pitch of one pair of binocular images by one subpixel,we can realize the ideal relationship between the average pitch of the binocular image and the barrier pitch. In our previousresearch, we could make the average pitch match to the ideal pitch on the discrete optimum viewing distances (OVDs),but we could not follow the viewing position between the discrete OVDs. In this paper, we propose the ICPM that cankeep the stereoscopic vision even at any viewing position. In order to verify the effectiveness of the proposed method, wemade the prototype displays and evaluated them. As a result, we showed the crosstalk ratio could be suppressed low overa very wide range by using the proposed method. Also, we confirmed we could obtain the stereoscopic vision at the viewingdistance from 300 mm to 729 mm by a subjective evaluation.
展开▼
