This paper proposes an integral volumetric imaging system that uses a coarse fly-eye lens and a fine fly-eye lens to show smooth and deep 3D image. Conventional integral volumetric imaging displays using a coarse fly-eye lens have suffered from low image quality due to distinct seam of lenses and moiré pattern caused by layered panel structure. To solve these problems the proposed system uses a fine fly-eye lens whose elemental lens has a long focal distance. By placing a fine fly-eye lens near the layered real image, the seam and the moiré are removed while the degradation of the presented 3D image is kept small.

No abstract

No abstract

The authors present an energy-efficient integral imaging system with suppression of pseudo images, which are caused by a leakage of rays from each elemental image to the adjacent elemental lenses. The leakage of rays can be decreased when the lens is paired with a segmented backlight with limited aperture, which consumes less electricity. To remove the leakage of rays completely without damaging the image to be presented, three modifications are implemented. First, a lens with a larger focal distance is used to decrease aberration. Second, a lens array composed of thick elemental lenses is used so that the leakage of rays can be blocked by the rough surface on the side of the thick lens. Third, the aperture of the segmented backlight is expanded to avoid loss of light in the right image.

Coarse integral imaging (CII), where each elemental lens is large enough to cover pixels far more than the number of views, can show clear floating 3D image when distortion is corrected. One of the major problems left to be solved for CII is suppression of pseudo images that appear around the right image to be presented. In this paper we propose two methods to suppress pseudo images. We first propose use of a lens array with a small F number. When a lens array composed of elemental lenses whose F number is small is set in front of the display panel, pseudo images can be erased by total internal reflection on the outskirt of the large aperture lens because the angle of incidence of the light ray that generates pseudo images becomes larger. The second method we propose is use of a lens array behind the display panel paired with segmented backlight. When convex lenses are set in front of the backlight with limited aperture, leak of ray out to adjacent elemental lenses can be avoided. Since the backlight area is reduced, this method can also reduce consumption of electric power without diminishing brightness of the right image.