Koji Nakamura

Super multi-view windshield display for long-distance image information presentation

A three-dimensional (3D) windshield display can display driving information in the vicinity of objects in the drivers front scene. We propose a super multi-view windshield display that can present the information in a wide depth range. The super multi-view display technique provides a smooth motion parallax. Motion parallax is the only physiological cue for perceiving the depths of 3D images displayed at far distances; these cannot be perceived by other physiological cues such as vergence, binocular disparity, and accommodation. A prototype system, which generates 36 viewing zones with a horizontal interval of 3.61 mm, was constructed. The smoothness of the motion parallax and the accuracy of the depth perception were evaluated.

Dielectric Dispersion in the Antiferroelectric Liquid Crystal MHPOBC

The dielectric dispersion in the ferroelectric and antiferroelectric phases of a smectic liquid crystal, 4-(1-methylheptyl-oxycarbonyl)phenyl 4-octyloxybiphenyl-4-carboxylate (MHPOBC), has been measured with several frequencies between 100 Hz and 100 kHz. The soft mode with the Debye-type dispersion was observed in the phase transition from the Sm A phase to the ferroelectric Sm C* phase. In the Sm C* phase, the Goldstone mode was observed at the frequency of about 4.5 kHz. The dielectric dispersion in the Sm CA*, Sm Cα* and Sm Cγ* phases is discussed.

Super-multiview windshield display for driving assistance

A three-dimensional windshield display (3D-WSD) can present driving information at the same depth as the objects in the outside scene. Herein, a super-multiview 3D-WSD is proposed because the super-multiview display technique provides smooth motion parallax. Motion parallax is the only physiological cue for perceiving the depth of a 3D image displayed at a far distance, which cannot be perceived by vergence and binocular parallax. A prototype system with 36 views was constructed, and the discontinuity of motion parallax and accuracy of depth perception were evaluated.