An apparent 3-D image can be perceived from only two 2-D images displayed at different depths, when an observer views them from the direction in which they are overlapped. The two 2-D images are created from an original 2-D image by dividing its luminance according to independently obtained depth information. Subjective test results show that (1) an apparent 3-D image is perceived and (2) the perceived depth continuously varies according to the change in luminance ratio between the two 2-D images.
A new volumetric three-dimensional (3-D) display system that provides all the
visual cues to depth perception has been developed. This system provides flicker-free,
large 3-D images of 250 mm in both diameter and depth with a viewing cone from
-10° to +10°. The system is simply composed of a dual-frequency
liquid-crystal (LC) varifocal lens (the key device), a two-dimensional display, and two
fixed lens. The focal length of the LC varifocal lens can be continuously varied from
-1.2 to +1.5 diopters (1/m) by changing the effective refractive index of LC.
Using a dual-frequency LC for the varifocal lens achieves sufficiently fast operation of
at least 60 Hz for flicker-free moving 3-D images. The simple structure of our
varifocal lens facilitates the fabrication of a large-diameter lens, resulting in large
3-D images with a sufficient viewing cone.
We propose a floating aerial LED signage technique by utilizing retro-reflection. The proposed display is composed of LEDs, a half mirror, and retro-reflective sheeting. Directivity of the aerial image formation and size of the aerial image have been investigated. Furthermore, a floating aerial LED sign has been successfully formed in free space.
We have studied the dispersion of the electronic states of TiTe2 by combined angleresolved inverse photo-emission (hw = 9.8 eV) and photo-emission ( h o = 21.2 eV) for various high-symmetry directions. The experimental band structure E ( k 8 ) is found to be in good agreement with a simple LCAO theory, in particular for the unoccupiedTi 3d-like bands.At lwe find a large trigonal splitting of 0.9 eV within the Ti 3d-derived tZgstates and observe additional photon emission associated with unoccupied Te 5p states. At the Brillouin zone boundary near M(L), emission due to the lowest d states is observed below and above EF for the same kpindicating possible many-body effects in the excitation process. This is attributed to the strong localisation of the Ti 3d states at the Fermi level. Unoccupied Ti 4s,p-like bands that do not overlap the d states were detected 5-8 eV above the Fermi level. In the resulting bulk band gap between the d and s, p states we observed an image potential surface state 0.7 e V below the vacuum level. From its parabolic dispersion an effective mass m * = 1.5 was determined. Similar results were obtained for the unoccupied states in TiSe?.
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