Earticle

Polymeric mesogens having a regularly alternating rigid-flexible repeating structure in the main-chain polymer exhibit distinct even-odd oscillation in their thermodynamic quantities with respect to the number of methylene units in the spacer. The even-odd oscillation depends on the number of methylene groups in the spacer the entropy change at the NI(nematic-isotropic) phase transition becomes less distinct when the linking group is replaced by the carbonate. In our previous work, we have suggested that the characteristics arise from the geometrical arrangement of the linkage. In this work, we have prepared a series of carbonate-type monomer and dimer liquid crystals. The thermodynamic behaviors at the NI phase transition have been compared with those previous reported for the ether- or ester-type liquid crystals. For the dimer series, the orientational order parameter of the mesogenic core was determined by using H-NMR technique. The origin of the difference observed among linking groups was found to the geometrical characteristics of chemical structure.

The color filter os made in four methods ; dyeing, printing electrodisposition and pigment dispersed method. Among technologies for color filter manufacture, pigment-dispersed and hybrid method are dominant over all others in commercial manufacture of large scale, fine resolution color filter for liquid crystal display. In this paper to investigate the possibility of the color filter manufacture for LCD by screen printing method, we synthesyzed PVA/sbQ screen emulation for high resolution, estimated image of printed fine pattern and manufactured color filter by screen printing. Results of the study are as follow and found the screen printing method os useful and valid from it. 1. Fine pattern is formed due to photocyclodomerization of -C=C- bond at 342nm, on the other hand unexposured parts are removed in water. 2. sharpness and resolution of fine pattern is improved at mesh streching angle 22.5 and 45 than 0 degree. It is expected due to resistance between inks and mesh streching angles. 3. Spectral characteristics of sample inks were R(640nm), G(535nm), B(470nm), transmittance were R(92%), G(79%), B(70%) and chromaticity coordinate values were R(0.62,0.33), G(0.32,0.59), B(0.14,0.17)

Today, regarded as a science in photography, the role of the lens and sensitizer is important. In this research, we manufactured simple test lens with a various diaphragm which is based on the general purpose lens, and measured the quantity of light and flare. The objective of this study is to figure out the characteristics of our test lens and maximize its usefulness. The results showed that (1) The quantity of light through the lens was not constant. (2) As for flare, its value was consist. (3) Our lens had the characteristics of the soft lens and (4) It had much chromatic abberation. Therefore, We found that a hand-made lens is to acquire visual image such as the effects of a specialized lens.

There has been an enormous emergence of imaging systems dedicated to hardcopy and softcopy color-appearance comparisons. Pre-press industry use the CRT as a soft proofing device to preview and aid with color corrections and changes before producing the final printed image. Color DTP system is required an accurate image-matching between CRT-image and printed image. In other to develop the color DTP,CRT calibration and CRT color transform to CIE color system are necessary. In this paper, we described a method CRT color transform to CIELab color system using RGB image raw data. Experimental results show that described method is useful valid of color image matching.

The function and technological merit of electronic image editing system using time-code addressing method are investigated. The method shortens the editing time and gives high accuracy. It is possible to digitize the editing system for high resolution and to vary and to systemize the VTR editing technique by this method.

Spectroscopic and Photoelectric Characteristics in the Cyanine and Merocyanine Dye according to systematically change of their structures were experimentally discussed. As result, in solution, Hetero atoms(X) of Cyanine and Merocyanine dye were participated in resonance X of d obital rather than X of pobital,effected in resonance and contributed in extension of conjugated system. in solid film,new spectra,called eximer-fluorenscence,were appeared in 3-dimensional fluorenscence of high density of Cyanine dye but not of Merocyanine. The activational energy of conductivity in Merocyanine dye was lower than in cyanine, an the contrary,the drift mobility was higher and the former in photoelectric characteristics was more effec-tive than the latter. In this paper,authors invertigated the changes of dye structure by molecular obital method to confirm the results of spectroscopic and photoelectric characteristics in the Cyanine and Merocyanine Dye acco-rding to systematically cally change of their structure, and counted total energy on dihedral angle and dipol miments if dyes in S0 and S1.

Liquid crystal-polymer composite(LCPC) films promising new materials for both projection displays and vision product. LCPC films consist of a continous liquid crystal phase embedded in a three- dimensional network of polymer matrix. The liquid crystal in these LC phases can be elecrtrically switched giving rise to an opaque scattering off-stats and a transparent, non-scatting on- stats. In this work. a premixture is composed of LC, UV-curable monomer and photonitiator. LCPC films are formed by photopolymerization induced phase separation from this premixture. In conclusion, structure and electro-optical properties of LCPC films strongly depends on the selection of monomer, LC content and curing rate.

The oscillation in the entropy change at the NI(nematic-isotropic) phase transition temperature becomes less distinct when the linking group is replaced by the carbonate. In our previous work, we have suggested that such characteristics arise from the geometrical arrangement of the linkage. In this work, deuterium NMR studies have been carrier out for a series of carbonate-type dimer liquid crystals MCOC(O)O(CH2)OC(O)CN(CBC-c, c=5.6) to elucidate the conformational characteristics of the spacer in the nematic phase. The H-NMR spectra were recorded on a JEOL GSX-500 apparatus by using deuterium labelled CBC-n. Following the previous treatment, the single-ordering-matrix model was adopted, in which the molecular axis was defined along the line connecting the centers of the terminal mesogenic cores. Conformer fractions were estimated by simulation so as to reproduce the observed NMR profile. Under a nematic constraint the conformers should be restricted to a certain portion of all the allowed conformations of the spacer in the free stats. Hence the calculations were carried out for an ensemble of conformer having the angle between the mesogenic core and the molecular axis smaller than a certain valur Successful results were as follows: