No abstract

Eyewear display measurement and evaluation is based on the light rays directed from the display to the viewer and the entrance pupil of the measuring equipment. The evaluation results show that the pupil size should be smaller than the width of the light rays, found to be effective for correct evaluation and measurement of significant characteristics, such as luminance and its uniformity, in an eyewear display.

Copper(I)-promoted coupling reaction of aryl halides with sodium diethylmalonate occurred smoothly in dioxane. The qualitative trends in the activity of copper(I) salt followed the order: CuBr > CuI > CuBF4(CH3CN)4 > CuCl. The activity was lowered in the presence of coordinating molecule such as acetonitrile, pyridine, NaI, phosphine, and sulfide. The reaction was generally applicable to aryl halides with various substituents.

We have developed high‐speed bend transition method of OCB (Optically Compensated Bend) mode TFT‐LCDs. We found out that nucleation of bend transition occurs with twist alignment. New pixel structure and driving scheme generate bend domains using “electrical twist field” which is lateral electric field to induce twist orientation of liquid crystal. The probability of bend nucleation depends on lateral twist and vertical transition electric field, and slightly depends on temperature. Growth speed of bend domain depends on the vertical transition voltage and viscosity of the liquid crystal. Bend transition time is mainly determined by the growth speed. A lower viscosity liquid crystal and a high transition voltage are preferable to achieve the high‐speed bend transition especially at low temperature. We have developed 22 inch diagonal HDTV which achieved the bend transition time to be less than 0.2 sec even at 0°C

We studied the alignment of liquid crystal molecules on rubbed, thin polymer films of polystrene and its derivatives. Liquid crystal molecules were aligned perpendicular to the rubbing direction, although the polymer main chains of rubbed films were oriented along the rubbing direction. The alignment of the liquid crystal depended on the choice of side phenyl groups of polystyrene derivatives, and the pretilt angle varied with the type and the position of the substituents that were introduced into the side phenyl groups. Homogeneous alignment for ferroelectric liquid crystal was obtained by using poly(N0, styrene), poly(p-OH styrene) and poly(4-vinylpyridine) films, which have relatively high P-dispersion and glass transition temperatures.