Katsusada Motoyoshi

A high contrast and high transmittance multiplexing ssflc display utilizing naphthalene base liquid crystal materials

Abstract Both bookshelf and quasi-bookshelf layer structures are obtained by using naphthalene base liquid crystal mixture with a rubbed polymer orientation films panel. This panel shows a high contrast ratio reaching at 35:1 and high transmittance of 40% driven by multiplexing method.

Polyazomethine conjugated polymer film with second order nonlinear optical properties fabricated by electric‐field‐assisted chemical vapor deposition

We fabricated polyazomethine head‐to‐tail conjugated polymer films with second order nonlinear optical (NLO) properties using a dry‐processing technique, electric‐field‐assisted chemical vapor deposition (E‐CVD). Molecular orbital calculations show that the polyazomethine conjugated polymer chain, to which methoxy groups are attached as donors, has second order NLO susceptibility, β, 3–5 times larger than that of paranitroaniline. During film deposition the monomers were ordered by an electric field applied between slit‐type electrodes, and simultaneously polymerized. A channel waveguide for the TE mode of a He‐Ne laser beam was formed in a polymer film between the electrode gap. An electro‐optic (EO) effect in the polymer film was observed using a Mach–Zehnder interferometer. This indicates that head‐to‐tail conjugated polymers would be promising for second order NLO materials.

A high‐contrast multiplexed dot‐matrix FELCD using naphthalene‐based FELC and conductive polymer films for orientation

— A direct-multiplexed ferroelectric liquid-crystal display, having a contrast ratio as high as 35:1 without showing zigzag defects, has been realized by using an electrical conductive orientation polymer: a polypyrrole film together with a special material containing naphthalene-based ferroelectric liquid crystals. The polypyrrole orientation films can effectively suppress the formation of depolarization fields, resulting in a stable memory capability and a high contrast ratio.

High-contrast SSFLC display utilizing naphthalene-base liquid crystal materials and conductive orientation films (Invited Paper)

This paper reports the electrical properties of a surface stabilized ferroelectric liquid crystal display provided by an almost ideal bookshelf layer structure. The bookshelf layer structure is obtained by ordinary rubbed polymer film cell by utilizing a particular liquid crystal material; naphthalene-ring contained liquid crystals. First, we show the layer structure of the naphthalene base FLCs analyzed by x-ray diffractions. Second, the electro-optic switchings of the naphthalene base FLCs are discussed. Then the effect of the depolarization field on the polarization switching is mentioned. Some polarization switching phenomena in conjunction with the the conductivity of the orientation layer is shown. Finally, we mention our multiplexed FLC prototype. It has 640 X 201 pixels, shows 40:1 contrast ratio, and 40 transmittance.