This paper proposes an electronic version of coarse integral volumetric imaging (CIVI) display with wide
viewing angle. CIVI is a 3D display solution which combines multiview techniques based on integral
imaging with volumetric techniques using multilayer panels. Though CIVI has solved most of the major
problems of conventional 3D displays, it still has two shortcomings to be overcome. One is the difficulty in
realizing electronic display due to unavailability of electronic color display panels transparent enough to be
layered for volumetric imaging. The other is the limited viewing angle because of the aberration of lenses. As
for the former problem the simplest way to attain electronic version of CIVI is to use half mirrors to merge
multiple images from different depths. Though high quality 3D image can be attained with this method, the
system size becomes large. To avoid bulky mirror system and realize compact system size, the authors
propose layered use of a color panel and multiple monochrome panels to emulate color volumetric
display. To expand viewing angle, the authors propose a display system where smaller CIVI display
components, each of which has little aberration, are connected so that each display plane faces toward the
center of the image optically generated.
In the present paper the authors analyze detailed optics of stereoscopic display combining cylindrical lenses and
embedded striped patterns, which has been proposed to reduce the contradiction between binocular parallax and focal
accommodation of the eyes. The proposed system lets the viewer see an image including high frequency striped patterns
through a cylindrical lens. When the viewer is shown a striped pattern through a cylindrical lens, the depth on which
his/her eyes focus depends on the inclination angle of stripes, for the cylindrical lens works as a lens with different focal
length depending on the orientation of lines. To control the status of accommodation correctly, it is necessary to obtain
the correspondence between the inclination angle of stripes and the focusing distance. To attain this goal we make a
computer simulator to calculate the 3D optical paths. The validity of the computer simulator is confirmed by physical
experiments with a cylindrical lens and a camera finder to measure the focal convergence of striped lines. We also
confirm that this system can induce desired focal accommodation by measuring the eyes of the viewer seeing striped
patterns through a cylindrical lens.
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