ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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24.20
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Increases in Driving Voltage of Organic Light Emitting Devices During Continuous D.C.Operation under a Constant Current
    H. Fujii, M. Nakai, Y. Hamada, T. Tsujioka, H Takahashi
    Article type: Article
    Session ID: IDY2000-92
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In order to improve the running durability of organic light emitting devices (OLEDs), various single layer devices were examined for gradual increases in driving voltage during continuous d.c.operation under a constant current. The rate of voltage increase for aluminum tris(quinoline-8-olate)(Alq), which is the most popular material for electron transport layer (ETL), was largest, however, those for many hole transporting materials were small. The rates of voltage increase depended on the electric field strength across the organic layer. Therefore dominant contribution to voltage increases were attributed to changes in the ETL, which may depend on electric field strength and amount of injected holes into ETL.
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  • Development of Fine-Patterning Method for Organic EL Devices using Metal Mask Sliding in Vacuum Vapor Deposition
    Koji Utsugi, Masashi Tamegai
    Article type: Article
    Session ID: IDY2000-93
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have fabricated a metal mask sliding system for the fine patterning of lateral three-color (RGB) emitters in multi color organic EL devices based on vacuum-deposited thin films. The system has an XY stage which consists of plate-spring structure that enables the metal mask to slide minutely, with the sliding carefully controlled by DC servo motors. We were able to obtain multi color organic EL devices of 240×100 dots by the newly developed metal mask sliding system. The pitch of RGB film pixels was 99μm horizontally and 100μm vertically. The emissive area was about 26μm×75μm in the sub-pixels and aperture ratio was about 60%.
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  • Normally White Mode Single Polarizer STN-LCDs
    S. Komura, K. Kuwabara, O. Itou, K. Funahata, K. Kondo
    Article type: Article
    Session ID: IDY2000-94
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_11
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In reflective color STN-LCDs, it is necessary to achieve achromatic representation in single polarizer STN-LCD modes which are used in them. We developed an optimization method for optical components of the signle polarizer STN-LCD modes in order to achieve achromatic representation. Applying it, we have proved that a normally white (NW) mode can be realized as well as a normally black (NB) mode which are usually used in current reflective color STN-LCDs. Comparing the viewing angle characteristics of NW and NB modes, we found that those of NW mode is better than those of NB mode. Especially, high reflectance can be realized even at a larger viewing angle in NW mode.
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  • Improvement in the Brightness of Novel Fluorescent Liquid Crystal Displays
    R. Yamaguchi, J. Kishida, S. Sato
    Article type: Article
    Session ID: IDY2000-95
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A novel multicolor fluorescent liquid crystal display (LCD) is reported that the brigthness can be improved upon compared to the former mode of fluorescent LCD. The novel fluorescent LCD is consisted with the fluorescent homogeneous and TN cells which are containing a dichroic phosphor, and a sheet polarizer. Both fluorescent layers emit fluorescence of which polarizing directions perpendicularly intersect each other, since their absorption axes also intersect at right angles. The color of the fluorescence passing through the polarizer is continuously changed by applying a voltage across the TN cell. Color switchings are demonstrated and their properties are measured in combinations of blue/green, red/green and blue/red fluorescent layers.
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  • Study on Photostability of LC Materials with High Birefringence
    Sayuri Ogiri, Ryoko Kimura, Kenichi Nishikawa, Atsushi Sawada, Shohei ...
    Article type: Article
    Session ID: IDY2000-96
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    To evaluate the photostability of LC materials with high birefringence, two kinds of tolane derivatives were used. Photoirradiation was performed at 366 nm isolated with glass filters from a high-pressure mercury lamp. It was found that absorption edge shifted at longer wavelength and absorbance at irradiation wavelength increased with irradiation energy. In addition, the minute difference of absorption edge was affected by photostability. Introducing cyclohexyl group was effective for photostability. Furthermore, it was revealed that there was possibility of photochemical reaction even small molar absorptivity.
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  • Microscopic Study of Polymer Network Morphology Formed in Ferroelectric Liquid Crystal
    Hideo FUJIKAKE, Takeshi MURASHIGE, Jun YONAI, Hiroto SATO, Hiroshi KIK ...
    Article type: Article
    Session ID: IDY2000-97
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The morphology of fine polymer network formed in ferroelectric liquid crystal was observed with an optical microscope and a scanning electron microscope, and its formation mechanism was studied for obtaining the rigid polymer network supporting substrates of the liquid crystal devices. It was found that the polymer made from mono-functional acrylate monomer by photopolymerization-induced phase separation forms a small fiber morphology with fibril aggregation, which is aligned in parallel to the liquid crystal molecular orientation controlled by alignment layers. The polymer fiber became shout with the increase of the monomer concentration. The self-assembling phenomenon is considered to be induced by the interfacial tension of liquid polymer component in polymerizing, and the transient morphology of polymer in phase separation process is rapidly fixed by the polymer curing. By forming the aligned polymer fiber network, the spatial grayscale capability was obtained due to the polydomain structure of liquid crystal, and high contrast ratios over 100:1 are achieved for each primary color because of good uniformity of ferroelectric liquid crystal alignment.
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  • Novel ferroelectric liquid crystal (FLC) mode for active matrix liquid crystal display (AM-LCD) using Ch-SmC^* phase transition material
    Hirohide MUNAKATA, Takeshi TOGANO, Yasufumi ASAO, Kouji NOGUCHI, Ryuic ...
    Article type: Article
    Session ID: IDY2000-98
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_35
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have proposed a novel ferroelectric liquid crystal (FLC) mode, which has the ability of gray scale displaying with the active device such as a thin film transistor (TFT). This technology is based on the mono-stable FLC mode, which is obtained by the material with the cholesteric (Ch) - chiral smectic C (SmC^*) phase transition sequences and applying small DC voltage nearby the phase transition temperature from Ch to (SmC^*) for making the layer normal direction uniform. The electro-optical response of liquid crystal molecules under the AC voltage is asymmetric between plus and minus voltages. It shows the characteristics such as low spontaneous polarization (P_s) value, fast response time, small temperature dependency and wide tolerace to cell gap non-uniformity. Furthermore, we have made TFT prototype panels using this mode. We could confirm this mode realizing high quality moving-pictures without blurring based on the non-holding displaying and good color reproducibility based on the field sequential color method.
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  • Light Extinction Characteristics of Polymer Dispersed Liquid Crystal Films
    Hiroshi Kikuchi, Hideo Fujikake, Masahiro Kawakita, Kuniharu Takizawa
    Article type: Article
    Session ID: IDY2000-99
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_41
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Dependences of turbidity on film thickness in polymer dispersed liquid crystal (PDLC) films are measured for droplet-type, which liquid crystal (LC) droplets were dispersed in polymer matrix, and a network-type, which contains a three-dimensional polymer network in LC. In the droplet-type films, the characteristics of light extinction at the interfaces with substrate differ from it at the middle layer. The turbidity in the interfaces is lager than middle layer and greatly dependent on LC droplet size. In other side, in the network-type films, the turbidity is bigger than the droplet-type. The dependence of extinction on the wavelength is much small. The relationship between the film structure and scattering properties was investigated experimentally.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: March 03, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.20.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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