ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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22.5
Displaying 1-24 of 24 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Bibliography
    Pages Misc1-
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_Misc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Material and Cell Design of Fast Response IPS Mode TFT-LCD
    M. Tsukane, N. Kato, S. Asada, Y. Yamamoto, K. Tsuda, H. Wakemoto, Y. ...
    Article type: Article
    Pages 1-6
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A In-Plane-Switching(IPS) mode has wide viewing angle characteristics compared with Twisted-nematic (TN) mode, but slow response and low aperture ratio become problems. For the purpose of development of IPS mode TFT-LCD for large size and high resolution monitor use, we have clarified dependence of cell and liquid crystal material parameters on applied voltage and response. On the Basis of the result, we have determined cell and liquid crystal material parameters, by taking advantage of newly developed driving method with low applied voltage and cross-talk free image. A 15.2-in. diagonal wide IPS mode TFT-LCD with fast response equivalent to IN mode, has been fabricated.
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  • A Study on internal stress of the sealant for LCD panels : Adhesive strength comparison between UV curable sealant and thermosetting one
    Kazuyoshi Teramoto, Fumio Matsukawa, Yasuhiro Morii, Kazushi Haruna
    Article type: Article
    Pages 7-13
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An adhesive strength of the LCD sealant was measured using Double Cantilever Beam(DCB) test. It becomes clear that the degrease in the adhesive strength of UV curable sealant has been small compared to the strength of thermosetting one after 500hrs. of 60℃ 90%RH testing, though the initial strength is lower. The fracture of the UV curable sealant was cohesive failure, on the other hand, the thermosetting one was interfacial failure between resin and glass substrate. Furthermore, in the case of having an organic layer between the sealant and the glass substrate, UV curable on has kept the higher strength than the thermosetting one. It is concluded that the internal stress generated in the UV curable sealant is smaller than the one in the thermosetting sealant.
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  • Relation between surface alignments of liquid crystals and surface energy
    Tadashi Kawamura, Tetsuya Miyashita, Tatsuo Uchida
    Article type: Article
    Pages 15-19
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_15
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Quantitative measurement of anchoring strength of rubbing surface is quite important for research on physical properties of liquid crystal as well as its application, while they have been no suitable measurement method when the anchoring strength is high. Therefore, we propose a new method using phase transition droplet to evaluate the surface order parameter, which is relating to the surface anchoring. We have confirmed that this droplet method is useful to measure from strong to weak anchoring in the rubbed polymer surface. Also we have found that the surface anchoring increases according to the rubbing strength, and that no rubbing surface generally has certain value of surface order even though the azimuthal liquid crystal alignment is random, which means that the surface order in the polar distribution is relatively high.
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  • Alignment of Liquid Crystal Molecules at (Polymer/Liquid Crystal) Interface
    Hirotsugu Kikuchi, Takahito Yoshida, Tisato Kajiyama
    Article type: Article
    Pages 21-24
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Orientational adsorption behavior of liquid crystalline (LC) molecule onto a rubbed polymer surface was evaluated by measuring the optical retardation of the rubbed substrate dipped in a solution in which a liquid crystal was dissolved by organic solvent. The LC molecules were adsorbed in the direction parallel to the rubbing direction. The adsorbed molecules were not easily desorbed even if the substrate was rinsed by pure solvent. The adsorption of molecules of which intermolecular interaction was larger reached the equivalent state at lower concentration of solution. This result indicates that a selective adsorption should occur at an interface between LC mixture and a substrate, that is, there should be some difference in the constituent fraction of LC between interface and bulk.
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  • Deuterium NMR Investigation of the Director Distribuiton in a Nematic Liquid Crystal Slab Subject to Electric, Magnetic, and Surface Fields
    T. Miyamoto, K. Nakamura, P.J. Le Masurier, A. Sugimura, B.A. Timimi, ...
    Article type: Article
    Pages 25-29
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The director distribution in nematic liquid crystal confined between two glass plates, with a weak and strong anchoring condition has been investigated both experimentally and theoretically. The quadrupolar splitting decreases with increasing electric field, through zero and then increases again to a value which is essentially half of that in zero electric field. It would seem that the director orientation changes more or less continuously from being parallel to the magnetic field to being orthogonal to it, as the electric field grows. The deuterium nuclear magnetic resonance spectra predicted by a continuum theory approach involving the magnetic, electric, elastic, and unified surface anchoring energies are found to be in good agreement with experiment.
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  • Orientation control of antiferroelectric liquid crystals (AFLCs) by temperature gradient cooling method
    Mayumi Iguchi, Akiji Higuchi, Katsuhiro Suzuki, Takao Minato
    Article type: Article
    Pages 31-38
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    It has difficult to form chevron layer structures without zigzag and line-like defects and produce a cell with sufficient ability to withstand external impact on the antiferroelectric liquid crystals (AFLCs). These two problems should be resolved at the same time. We made the rugged cell having many tunnels closed off except at the inlet and outlet, and developed the method of cooling them from one end to the other under a temperature gradient. The direction of layers bend is uniquely controlled by the direction of molecular movement due to bulk volume contraction, with decrease in temperature. Zigzag and line-like defects remarkably decreased.
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  • Alignment Process of Cholesteric Liquid Crystal Polymer
    H. Motomura, T. Kameyama, N. Takahashi
    Article type: Article
    Pages 39-43
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_39
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper discusses the alignment process of cholesteric liquid crystal polymer (Ch-LCP) on alignment film. The alignment process was clarified by studying cross sections and surfaces of Ch-LCPs produced with different alignment process time using a transmission electron microscope differentialm interference microscope, and atomic force microscope. It was also determined that Ch-LCP's disclination which is generated during the initial stage of alignment process decreases with the length of alignment process time. Measurement of these Ch-LCP's reflection properties showed that mirror reflectance increases and diffuse reflectance decreases with the length of alignment process time, indicating a uniquely cholesteric selective reflection. The decreased diffuse reflectance is considered to be caused by reduction of disclination, and a correlation was obtained between reflection properties and degree of alignment as shown by the above mentioned microscopic photographs.
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  • Contributions from Plural Kinds of Ionic Impurities to the Dielectric Properties of a Liquid Cristal material in a Low Frequency Range
    Atsushi Sawada, Yuji Nakazono, Shohei Naemura, Kazuaki Tarumi
    Article type: Article
    Pages 45-50
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The frequency dependent dielectric behavior of a liquid crystal material (5CB) in a low frequency range is analyzed in terms of space charge polarization. In a condition that the electrostatic interaction among the ions can be neglected, the dielectric constant and the dielectric loss factor are considered to be given as the sum of a contribution from each ion kind if the dielectric contains plural kinds of ions. We evaluated the anomalous dielectric behaviors of 5CB due to the ions in a low frequency range separating the observed values into the contributions from plural kinds of ions. As the result it is found that the theoretically calculated curves can successfully trace the observed values by introducing four kinds of ions.
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  • The Control of the Threshold Voltage of SSFLCDs using Polymer Networks
    H. Matsui, T. Miyata, H. Hasebe, H. Takatsu, S. Kobayashi, Y. Iimura
    Article type: Article
    Pages 51-55
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_51
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this research, we report a method to realize grayscale operation of SSFLCDs by controlling the threshold voltage of the samples. The control of the threshold voltage is achieved by forming liquid crystalline polymer networks in a FLC cell using a UV curable liquid crystalline monomer. It is found that the threshold voltage of the samples decreased with increasing the concentration of the doped monomer. These results lndicate that, if the amount of the polymer network formed in a FLCD is saried from a region to a region in one pixel, we can get a quasi-multi-stable SSFLCD, resulting in the grayscale operation of the device by a passive matrix addressing.
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  • Optical calculation of Holographic Dispersed Liquid Crystal (HPDLC)
    Koji Mimura, Ken Sumiyoshi
    Article type: Article
    Pages 57-62
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_57
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The holographic PDLC, which required no color filter nor polarizer, and have shown that a promising novel color refractive LCD because of its high reflectivity and high color purity. It has a diffraction grating structure with alternating liquid crystal and polymer layers. We have simulated the optical property of HPDLC and have in the case of S-polarized light incident, a high reflectivity is expected, which in the case of P-polarized light incident, the reflectivity depends on relation between the angle of incidence and the direction of the multilayer. We have also estimated the optical property of HPDLC depending on our measurements of optical constants of LC and of polymer.
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  • Reflection type Liquid Crystal Display Devices Using Polymer-Cell Wall Type Liquid Crystal Light Shutter
    Tadahiro Asada, Michiko Hori
    Article type: Article
    Pages 63-67
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_63
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Polymer Cell Wall Type Liquid Crystal (PCW-LC) light shutter has been developed for liquid crystal polymer complexes (LCPCs), utilizing the light scattering of cholesteric focal conic texture. This type of liquid crystal light shutter is an energy saving type because of non-polarizer usage. When this type of light shutter is utilized for reflection type liquid crystal display, the saving of energy will be expected to become great. At first, a dot matrix type device of black and white display has been constructed.
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  • A 2 inches in diagonal Reflective Light valve using Low temperature poly-silicon Thin Film Transistors
    Masaya Kunigita, Naoki Kato, Kunio Masumo, Yoshiharu Ooi, Masanori Yuk ...
    Article type: Article
    Pages 69-74
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_69
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A reflective light valve was fabricated to realize a small sized and high lumen output projector. Appropriate light valve size having high efficiency for scattering was derived by a calculation. Both pixel array and peripheral drivers were integrated by low temperature poly-Si TFTs on a glass substrate to get a 2 inches diagonal XGA light valve. An opaque organic film was used as a planarization layer and also as a light shield layer. High density screen image was obtained by 40μm pitch pixels.
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  • A Poly-Si TFT LCLV with an Integrated Data-Driver using Amplifiers
    Hiroyuki Sekine, Hideki Asada, Kazuo Mochizuki, Yasunori Ogawa, Kazuno ...
    Article type: Article
    Pages 75-80
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_75
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have proposed a compensation method for the offset voltage variation in the poly-Si TFT amplifiers for a LCLV (Liquid Crystal Light Valve), where the error data are stored in memories and added to the video signals. Good uniformity of the output voltages of the amplifiers has been obtained by this method. A good gray-scale image has been achieved by a 2.7-in. poly-Si TFT LCLV with the data-driver.
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  • COG technology of TFT-LCDs : Development and quantity production of LCDs by COG method
    Kazunari Tanaka
    Article type: Article
    Pages 81-86
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_81
    CONFERENCE PROCEEDINGS FREE ACCESS
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    As for the liquid crystal display which has the advantage of thickness, light weight and low consumption electric power compact size, moreover, is expected. We grappled from the mounting side, and developed the COG method which ACF(Anisotropic Conductive Film) was used for, and it was put to practical use. Not only the subject of the usual TAB method was solved but also the compact LCD module that came to mention above was realized. And building of the production line that reduced switching loss to a minimum was made possible by the quality improvement such as indication characteristic and connection reliability, by the simplification of the liquid crystal panel inspection process and by standardization of the driving LSI, and so on. This paper describes device and process technology of the TFT-LCDs by the COG method adopted widely around for the AV machine.
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  • About the optical deterioration phenomenon of the TFT liquid crystal panel
    Akitoshi Ika
    Article type: Article
    Pages 87-90
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_87
    CONFERENCE PROCEEDINGS FREE ACCESS
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    For visual displays such as Car-TV and Navigation systems, a TFT-lcd is produced widely with the characteristics of thin, light weight, high brightness and wide viewing angle. At present, Lcd panel is being requested with high durability performance in the high brightness of illumination. In this paper, We introduce one of activities that it is turned to Lcd panel of indication improvement in the reliability with high brightness and high durability.
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  • Simplified Screen Inspection Method for TFT-LCD Panels
    Shinichi Hoshino, Seiichiro Hori, Hideyuki Imura, Tomohiro Murata, Eij ...
    Article type: Article
    Pages 91-95
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_91
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In the fabrication process of TFT-LCD, the screen inspection before mounting of driving LSI is necessary for improving its productivity. A conventional screen inspection was carried out by temporarily connecting many probes to the corresponding electrodes on LCD panel. But this conventional method has some problem such as poor productivity by adjusting the position of the probes quite precisely, expensiveness by remaking the new probes for every LCD panel and maintaining the probes themselves. In this report, we will introduce the simplified screen inspection method which has resolved the above mentioned problems.
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  • Evaluation Apparatus of Reflection Type Liquid Crystal Display Devices
    Tadahiro Asada, Kouichi Akahane
    Article type: Article
    Pages 97-98
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_97
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An apparatus to evaluate the optical properties of refrection type Liquid-Crystal display devices has been developed. This apparatus will contribute also to evaluate usual transparent type liquid crystal display devicies. The appratus has beendeveloped taking into account the relation between human eyes and display panel.
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  • Ultra Low Power Consumption Driving for Reflective Color STN-LCDs
    Toshiya Otani, Hiroshi Kinoshita, Shingo Fujita, Hiroaki Mizuno, Hisan ...
    Article type: Article
    Pages 99-104
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_99
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have evaluated the driving method and the circuit construction for ultra low power consumption on reflective color STN-LCDs with a single polarizer. With respect to the driving method, we have found APT was more effective than IAPT which has the low voltage level in the row side for low power consumption. On the circuit construction, we have analyzed the power consumption in every circuit block. Then, we have developed the DC/DC converter, and optimized the power supply circuit. As a result, we have realized the ultra low power consumption driving of less than 100mW.
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  • Electro-Optical Properties of Reflective Color STNLCD using ECB-Effect
    Y. Okuda, N. Matsui, I. Fukuda, Y. Kotani, T. Tchida
    Article type: Article
    Pages 105-110
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_105
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In recent years, commpact, portable OA and AV equipments have attract wide interest, and accordingly, blight, high-resolution reflective color LCDs without backlights are strongly required. As a reply to this requirement, a new reflective color STNLCD using ECB-effect with one polarizer and one retardation film, in which the reflector is placed inside the liquid crystal cell, is proposed. The electo-optical properties of the cell were numerically analized, and it was found from the results that several sets of solutions exist in order to obtain a blight multi-color image, but no such solutions were obtained without the use of a retardation film.
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  • High Reflective(HR)-TFT LCD : Optimum Optical conditions of retardation film and the retardation of LC layer for the reflective type LCD with a polarizer
    Takashi Sato, Yasuhisa Itoh, Naofumi Kimura, Sigeaki Mizushima
    Article type: Article
    Pages 111-116
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_111
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Display color qualities of reflective type LCDs with a polarizer are strongly influenced by variations of optical retardation of LC layer and refractive index dispersion of a retardation film. In this paper, we report that coloration do not occur both white and black state in case of normally white type display mode with a polarizer by selecting the retardation of the LC layer and the refractive index dispersion of the retardation film.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: January 30, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.5.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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