ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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21.41
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • VUV-excitation phosphors based on zinc oxoacid-salts
    Nobuyuki Yokosawa, Eiichiro Nakazawa
    Article type: Article
    Pages 1-5
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The vacuum-ultraviolet (VUV) excitation spectrum of Zn_2SiO_4・Mn phosphor has such a peculiar characteristic that it keeps almost same efficiency in the much higher energy region than the host absorption edge, i.e., at such a short wavelength as 147nm used for excitation of phosphors in PDP (Plasma Display panel) and rare-gas fluorescent lamps. In order to find the origin of this unusual but preferable property of this phosphor as a VUV-excited phosphor, some phosphors based on zinc oxoacid-salts (Zn_2SiO_4,ZnGa_2O_4,ZnAl_2O_4) activated by Ti, Cr are investigated. It is shown that the unusual property of Zn_2SiO_4・Mn phosphor is rather common to Zn-O based phosphors, indicating an efficient excitation energy transfer among Zn-O atomic groups. Some new VUV-excited phosphors are proposed for the improvement of the color gamut of PDP and rare-gas fluorescent lamps.
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  • Improvement in electroluminescent characteristics of SrS : Ce thin-film devices by doping of divalent elements
    Toshikazu Endo, Mitsunori Harada, Tetsuro Kondo, Manuela Peter, Koutok ...
    Article type: Article
    Pages 7-10
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    To compensate Sr vacancies, divalent transition elements such as Zn and Cd were doped for SrS : Ce thin film electroluminescent (TFEL) devices. By Zn or Cd doping, EL emission spectra sift to blue region. Current spike, which results from a generation of a space charge in the SrS : Ce phosphor layer, is also reduced. However, a conduction charge and the EL luminance is decreased by the Zn or Cd doping. To increase a conduction charge and a luminance, Na doped SrS : Ce TFEL devices having ZnS buffer layers were prepared. The devices show a luminance of 1000 cd/m^2 and EL efficiency of 0.8 lm/W at 1 kHz.
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  • A New Reflective Display in ECB Mode
    Hidehiro Seki, Motomitsu Itoh, Tatsuo Uchida
    Article type: Article
    Pages 11-16
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_11
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A new reflective display is proposed. This display is composed of a scattering film, a polarizer, a quarter wave plate, a vertically aligned cell and a mirror reflector. The features of this LCD are high multiplexibility and gray scale capability.
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  • Following up the speed of change : Electronics in Japan
    Tetsuhiko Ikegami
    Article type: Article
    Pages 17-18
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Photoalignment mechanism of liquid crystals on poly (vinyl cinnamate) surface
    Eung Jin Kim, O Ok Park, Hai Feng Li, Yukio Kawanami, Hirokazu Furue, ...
    Article type: Article
    Pages 19-24
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Surface hydrogenation reaction was performed to distinguish the mechanism of the photoalignment using poly (vinyl cinnamate)(PVCi). The reaction makes it possible to remove any surface ordering of cinnamate side groups which may happen during the photoalignment process while the generated photoproducts are still intact. After considering the alignment and the azimuthal anchoring energy of the hydrogenated PVCi/E7 cells, it was found that the alignment of LC molecules is mainly induced by the photoproducts.
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  • Electro-Optical Effect of Polymer Stabilized SSFLCs
    H. Furue, Y. Iimura, S. Kobayashi
    Article type: Article
    Pages 25-30
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    It is shown that a polymer network, formed in SmA phase by the photo-cure of UV photo-currable liquid crystalline monomers that are doped in a surface stabilized ferroelecric liquid crystal (SSFLC), eliminates zig-zag defects in SmC^*, since a chevron structure is transformed into a quasi-bookshelf structure by the polymer main chain. In this study, we have observed the electrooptical effect of this polymer stabilized SSFLC (PS-SSFLC) with the aim at exploring the influence of the liquid crystalline polymer network on the alignment structure of FLC molecules. As the experimental results, it is found that liquid crystalline side chains bond strongly with main chain and attract FLC molecules in the rubbing direction. Furthermore, we propose a new PS-SSFLC fabricated by the photo-cure in SmC^* phase.
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  • Occurrence Condition of Bistable Twisted States in Chiral Nematic Liquid Crystal Cells
    Takafumi MATSUDA, Naoki ABE, Takayuki NASUNO, Susumu SAITO
    Article type: Article
    Pages 31-35
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The experimental investigation has been made for the influences of such parameters as the cell thickness d, the factor d/P_0), the pretilt angle, the wave form of applied voltage, and temperature on the bistability in the BTN (bistable twisted nematic) liquid crystal cell. As the liquid crystal material, the mixture of ZLI-2293 (Merck Co.Ltd.) and CB15 (BDH Co.Ltd.) were used. The initial state of molecular orientation was the anti-symmetric configufactorn with the twisted angle of 180°. The occurrence of bistability was confirmed in the range 0.5 <d/P_0<0.75. The bistability was evaluated by using the memory factor. As a result, it was known that the memory factor is independent of the ratio d/P_0,however, it decreases with the increase of cell thickness d. From the observation with an optical microscope, it was confirmed that the degradation of memory is governed by the movement of the disclination separating the 180° twisted state and the 0° or 360° twisted states. As the temperature was raised, the memory factor was abruptly degraded above a certain temperature at which the d/P_0 ratio is taken out the range 0.5 <d/P_0 <0.75.
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  • Ionic Contribution to the Dielectric Properties of Liquid Crystalsin a Low Frequency Range
    Atsushi Sawada, Yuji Nakazono, Shohei Naemura, Axel Pausch, Kazuaki Ta ...
    Article type: Article
    Pages 37-42
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The dielectric properties of liquid crystal materials containing an ionic substance are analyzed in terms of space charge polarization. The theoretical equations for the dielectric constant and the dielectric loss factor derived by eliminating a condition that the diffusion distance in a period of the external AC field is much smaller than the thickness of specimen can successfully explain the experimental results for the liquid crystal material 5CB. It is found that the value of diffusion coefficient obtained by the theoretical analysis is significantly close to the value obtained by Time-of-Flight method.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: July 04, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.41.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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