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22.4
Displaying 1-28 of 28 articles from this issue
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Article type: Cover
Pages Cover1-
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (139K) -
Hiroyuki YAMADA, Yoshiyuki SAKAGAMI, Yoshihiro KUBOTA, Toshihiro MIYAT ...Article type: Article
Pages 1-6
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper reports thin-film electroluminescent (TFEL) devices using a binary compound phosphor such as Ga_2O_3. EL characteristics of TFEL devices with a Mn-, Cr-, or Eu-activated Ga_2O_3 phosphor thin-film emitting layer, prepared by rf magnetron sputtering or dip coating, have been investigated. Ga_2O_3 : Mn, Ga_2O_3 : Cr and Ga_2O_3 : EU TFEL devices produced luminances of 1018 cd/m^2 in green, 270 and 27 cd/m^2 in red emissions, respectively, when driven at 1kHz. It can be concluded that a new oxide phosphor using Ga_2O_3 as the host material are very promising as the emitting layer for TFEL devices.View full abstractDownload PDF (576K) -
Yoshihiro KUBOTA, Hiroyuki YAMADA, Toshihiro MIYATA, Tadatsugu MINAMIArticle type: Article
Pages 7-12
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThin-film electroluminescent (TFEL) devices using a new multicomponent oxide phosphor such as CaO-Ga_2O_3 have been developed. EL characteristics of TFEL devices with a (CaO-Ga_2O_3) : Mn thin-film emitting layer prepared by rf magnetron sputtering were strongly dependent on the composition of the host material. Maximum luminances of 2790 (yellow emission), 215 (red emission), 30 (yellowish green emission), 16 (green emission), 6 (bluish white emission) or 2cd/m^2 (bluish white emission) were obtained in TFEL devices using a ternary compound CaGa_2O_4 activated with Mn, Dy, Tb, Tm or Ce, respectively, when driven by 1kHz ac sinusoidal wave voltage.View full abstractDownload PDF (590K) -
Hisamo Sogawa, Kazuaki Okamoto, Koutoku Ohmi, Shosaku Tanaka, Hiroshi ...Article type: Article
Pages 13-18
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSGray scale in active matrix electroluminescent display (AMEL) has been produced by sub-frame averaging method. It is difficult for EL display to obtain 256 gray scale using only pulse number modulation, due to slower response time of EL devices than that of PDP devices. We proposed new method which uses the combination of pulse number modulation and amplitude modulation in a frame to solve this problem. We have applied this method to an AMEL pixel and demonstrated a feasibility of AMEL display with 256 gray levels.View full abstractDownload PDF (605K) -
Haruki Fukada, Toshikazu Endo, Kunihiro Kita, Koutoku Ohmi, Shosaku Ta ...Article type: Article
Pages 19-24
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSLuminescent characteristics of blue-green emitting SrS : Ce and blue emitting SrS : Cu have been studied. The luminescent characteristics of SrS : Ce powder phosphors were improved by adding charge compensators to Ce^<3+> luminescent centers. Elecroluminescent characteristics of SrS : Ce thin films were also improved. SrS : Cu thin films, which were prepared by hot wall deposition with alternating supply of source materials, showed blue photoluminescence with a peak wavelength at 471nm.View full abstractDownload PDF (593K) -
N. Uekura, H. Kominami, T. Aoki, Y. Nakanishi, Y. HatanakaArticle type: Article
Pages 25-30
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSCe^<3+>-doped strontium thiogallate (SrGa_2S_4 : Ce) thin films with blue-emission have been prepared by multi-source deposition. Sr metal, Ga_2S_3 and CeCl_3 powder were used as source materials. The films were deposited at a substrate temperature of 450℃ and Ga_2S_3/Sr flux ratio of 50. After the deposition, they were annealed at 80O℃ for 1.5 hours in H_2S atmosphere. In this experiment, the dependence of the luminescent propreties of the film on Ce-contents in the film was investigation. The film showed the small red shift in luminescent spectrum and the decrease in luminescent intensity at Ce-contents higher than a critical value. It was suggested from the results of PL and CL measurement that the distribution of Ce luminescent center is uniform both at the suriace and in the bulk of the film. It was found that the optimum flux ratio of CeCl_3 to Sr, CeCl_3/Sr supplied for the substrate is around 3.0×10^<-2> for the luminescent intensity and spectrum.View full abstractDownload PDF (568K) -
Yoshiyuki SAKAGAMI, Toshihiro MIYATA, Tadatsugu MINAMIArticle type: Article
Pages 31-36
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA new type multicolor electroluminescent EL device with a thin-film/powder phosphor emitting layer has been fabricated without vacuum process. High-luminance multicolor emissions were obtained in EL devices using a ZnGa_2O_4 : Mn, ZnS : Mn or BaMgAl_<14>O_<23> : Eu powder phosphor in combination with a ZnGa_2O_4 : Mn thin-film phosphor : 335 cd/m^2 in green, 964 cd/m^2 in orange and 2.7 cd/m^2 in blue, respectively, when driven at 1kHz.View full abstractDownload PDF (550K) -
Mutsumi Suzuki, Masao FukuyamaArticle type: Article
Pages 37-41
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRelation of hole transport material and running durability was studied. Triphenylamine derivatives were used as hole transport materials, and examined the stability of amorphous state and running durability. The lifetime (to 1/2 initial luminance) of EL device using Alq and TPA oligomer, which is the highest thermostable hole transport material among the examined ones, is found to be 2000 hours for initial level of 500 cd/m^2.View full abstractDownload PDF (408K) -
J. Hori, T. Miyoshi, T. Kiyohara, H. Uchiike, Y. Aso, T. Otsubo, D. Ka ...Article type: Article
Pages 43-48
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe synthesized newly poly (3-methoxythiophene) as a conjugated polymer and fabricated an organic EL device by spin-coating. The device didn't emit. We fabricated a double layer device deposited Alq3 on an spin-coating film and Alq3 single layer device. It is confirmed that of pinholes exist in spin-coating film in the devices from the V-I and V-I characteristics.View full abstractDownload PDF (446K) -
Toshiaki TERASHITA, Shigeki NAKA, Hiroyuki OKADA, Hiroyoshi ONNAGAWAArticle type: Article
Pages 49-54
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSFabrication process of self-aligned organic EL devices with side-wall structure have been investigated. Principal point of the process is the formation of side-wall structure using reactive ion etching. Cathode was used as a mask for self-alignment and the insulating side-wall structure was formed around periphery of the device. The device characteristics was measured after side-wall fabrication. Emission was observed above 3.5V and was 1000cd/m^2 at 100mA/cm^2. After the side-wall process, wet-and photolithographic-processes could be applied. The emission have been also confirmed after final fabrication process.View full abstractDownload PDF (577K) -
Keiyu Takewaka, Ryo Udagawa, Hiroyuki Nioka, Tsuyoshi Ochiai, Tomokazu ...Article type: Article
Pages 55-60
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAn electro-static focus & deflection common electrodes type of flat CRT that uses line heated cathodes is proposed^<[1]>. The main feature of its structure is that one pair of electrodes are used for the vertical focus and the vertical deflection, and another pair of electrodes are used for the horizontal focus and the horizontal deflection. The experiments were conducted the various characteristics and displayed an image of monochrome with 9segments in demountable vacuum chamber. Moreover, this paper presents the basic configuration of the flat CRT, the principles of operation and the characteristics.View full abstractDownload PDF (895K) -
Toshiharu HIGUCHI, Katsuhisa HOMMA, Takahiro KAWAHARADAArticle type: Article
Pages 61-66
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDifferences in the behavior of dispenser cathodes and oxide cathodes in laminar-flow type and crossover type electron guns were investigated by experiments and simulations under high-current-density conditions. When an oxide cathode is operated under such conditions, the heating effect due to Joule's heat in the oxide layer exceeds the cooling effect, depending on the product of the work function and the cathode current, resulting in a rise in the cathode temperature. This rise in cathode temperature aggravates deterioration of emission characteristics during the life of an oxide cathode. In the case of the dispenser cathode, however, the cathode temperature decreases under high-current-density conditions. When an oxide cathode in a crossover type electron gun is operated, there appear equipotential surfaces formed in the curved surface in the oxide layer. The formation of an equipotential surface leads to relaxation of the cathode loading. It is considered that this is the reason for the longer life of an oxide cathode in a crossover type electron gun than that of an oxide cathode in a laminar-flow type electron gun.View full abstractDownload PDF (688K) -
Hisashi TOYAMA, Hidetsugu MATSUKIYOArticle type: Article
Pages 67-70
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe degradation of a green-emitting phosphor Y_3 (Al, Ga)_5O_<12> : Tb by an electron bombardment was reduced with introducing Yb or Sc. The traps in these samples were evaluated by measuring thermoluminescence data. As for Yb, traps related to Yb increased and the color centers decreased with increasing Yb concentration. It shows that the influence of color centers is suppressed by the traps related to Yb. On the other hand, no new traps related to Sc were observed, and the color centers decreased with increasing Sc concentration. It suggests the formation of color centers is suppressed by adding Sc.View full abstractDownload PDF (466K) -
M. Kottaisamy, D. Jeyakumar, M. Mohan Rao, Y. Nakanishi, Y. HatanakaArticle type: Article
Pages 71-76
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSHomogeneously europium doped yttrium oxysulfide (Y_2O_2S : Eu^<3+>) red phosphor with fine grains has been synthesized from a mono dispersed sub micron size yttrium-europium hydroxy carbonate precursor, using sodium thio-sulphate as sulfiding flux. The materials synthesized have been characterized by powder x-ray diffraction, photoluminescence emission spectroscopy and scanning electron microscopy. Phase purity, morphology, and grain sizes of phosphor powders depend on the flux composition and the calcination temperature. The result indicates that grain size distribution of the phosphor materials is retaining the grain size of starting material at low temperature and increase at high temperature.View full abstractDownload PDF (673K) -
H. Kominami, K. Horikawa, T. Aoki, T. Nakamura, Y. Nakanishi, Y. Hatan ...Article type: Article
Pages 77-82
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSLow voltage cathodoluminescent properties of the CRT phosphors (ZnS : Ag, Cl, ZnS : Cu, Al, and Y_2O_2S : Eu) coated with In_2O_3 conducting layer using In [OCH (CH_3)_2]_3 by the sol-gel method were investigated. It was found that the cathodoluminescent properties were changed extremely according to the variation of the coating thickness. In proportion as the In [OCH (CH_3)_2]_3 increase, the resistivity of the coated phosphor was decreased significantly. The charging-up on the phosphor surface irradiated by low acceleration voltage is suppressed to some extent. The deterioration of the coated phosphors is suppressed by further applying high vacuum. The number of incident electrons to the sample was evaluated as about 50% of that to metal electrode.View full abstractDownload PDF (623K) -
Yoshinobu Suehiro, Takashi Sato, Koji Uchida, Shigeru YamazakiArticle type: Article
Pages 83-88
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA new Malti-Layer type full color LED, capable of mixing different luminous wavelength to radiate many different colors of light (visible also from a close distance), at high levels of efficacy. Excellent luminous intensity, has been demonstrated by the prototype. Values of 10 cd white light has been achieved using Multi-layerd blue, red and green chips, at a current of less than 20 mA per chip.View full abstractDownload PDF (528K) -
Yasuo Sakaguchi, Kazunori Higuchi, Tomoaki Nakano, Shin YamamotoArticle type: Article
Pages 89-94
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWith the increasing number of on-board visual displays such as navigation systems, it is important to improve visibility of on-board displays in various visual environments, such as driving on a snow-covered road in fine weather. We propose a new displaying method based on the luminance adaptation, one of the human vision properties, associated with environmental luminance changes during driving. In this method, the luminance and the saturation of the display is compensated according to the adaptation luminance of the driver in order to perceive the constant brightness of the display even in the different environmental luminance. Experimental results of subjective and objective evaluation comparing the conventional display indicate the effectiveness of the method.View full abstractDownload PDF (859K) -
Tomoaki Nakano, Kazunori Higuchi, Kazuhiko Sugiyama, Yasuo Sakaguchi, ...Article type: Article
Pages 95-100
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn automobiles, the use of display systems has been increasing. Furthermore, the elderly population is also rapidly increasing. This paper describes a new approach for improving display visibility. In the proposed method, the contrast of the display images is improved by compensating the deterioration of two visual properties as aging ; the contrast sensitivity concerning the spatial frequency and the spectral transmittance of crystalline lens regarding the wavelength.View full abstractDownload PDF (809K) -
M. Sawa, S. Zhang, H. Uchiike, K. Watanabe, H. Hashimoto, K. YoshidaArticle type: Article
Pages 101-106
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn order to cralify temporal and spatial distribution of VUV from xenon above the electrodes of ac PDPs, we observed 147nm and 173nm VUV emission from xenon by using two-dimensional ultra-high speed electronic camera designed and compleded for the present work. It is confirmed that xenon emission of 147nm is simultaneously generated on both cathodes and anodes, but the emission process above cathodes is different from the one above anodes, and the reaction of the discharge above cathodes and anodes are discussed. It is cralified that the surface-discharge ac color PDPs have the advantage of improving luminance and luminous efficiency from observing of the xenon gas discharge process.View full abstractDownload PDF (926K) -
Mizumoto USHIROZAWA, Yasushi MOTOYAMA, Junro KOIKEArticle type: Article
Pages 107-112
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSCharacteristics of a thin-film Y_2O_3 cathode covering an Aluminum thin-film electrode were investigated. Both the Al electrode and Y_2O_3 were made by EB deposition. This cathode shows a small change of discharge voltage after aging. And its lifetime is more than 50,000 hours due to the suppression of deposition of sputtered Al. The operational margin of a panel with this cathode structure driven by the pulse memory is more than 20V. Good quality TV pictures were reproduced on an 8-inch panel with resistor-in-cell structure. During the lifetime test by pulse memory drive the whole panel was driven stable and the panel has long lifetime enough to practical use.View full abstractDownload PDF (584K) -
K. Yoshida, H. Uchiike, H. HashimotoArticle type: Article
Pages 113-117
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe secondary electron emission characteristics are measured and discussed concerning the properties of MgO and new materials which have transmissive properties to ultraviolet rays of 147 nm. The fundamental charagteristics were measured by the fabricated panels, with the tested dielectric materials.View full abstractDownload PDF (537K) -
Tetsuo SAKAI, Eiki NAGASAKA, Hiroshi SHOJIArticle type: Article
Pages 119-124
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt was reported that a TV picture is displayed on a 6cm diagonal DC PDP with positive column cell which was driven by DC mode memory scheme with 0.6 lm/W luminous efficiency. This paper reports followings : A same type 20cm diagonal panel with 0.57 cell pitch displays TV picture. 30 cel1s with wall phosphor shows 1.0 lm/W, luminous efficiency. The life is about 50000h. It is possible to remove vertical contaminate in the DC mode memory by compensating pulse with anode. We shows quantitatively dynamic false outline in the DC mode memory and if we use Kaji et al scanning method the false outline is removed.View full abstractDownload PDF (616K) -
T. Aikawa, M. Ishii, K. Igarashi, S. Mikoshiba, J.D. Ryeom, K.Y. ParkArticle type: Article
Pages 125-129
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA new drive scheme for three-electrode, surface discharge AC-PDPs has been developed. The scheme enables us to reduce the number of scan drivers from 480 to 44,an order of magnitude reduction, for the case of NTSC expression. Images with 256 gray levels have successfully been displayed using the scheme in a 16×48-cell region at an NTSC rate.View full abstractDownload PDF (519K) -
T. Kosaka, A. Tokai, K. Irie, O. Toyoda, N. Awaji, S. Kasahara, F. Nam ...Article type: Article
Pages 131-135
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe studied a high-resolution plasma display panel (PDP) for an engineering workstation (EWS) or personal computer (PC) monitor. With a high-performance multimedia monitor in mind, we attempted to develop a high-resolution 25-inch diagonal PDP with 1280×1024 pixels (SXGA). To evaluate the basic characteristics, we fabricated a 640×480 experimental panel with 0.39-mm pixel pitch. The fabricated panel exhibited a high luminance of 190 cd/m^2,a high contrast ratio of 60 : 1 or better, and a wide viewing angle of over 160 degrees. We confirmed that PDP has the feasibility as an EWS and PC monitor.View full abstractDownload PDF (773K) -
Yi-Wen Zhu, T. Yamaguchi, T. Shiga, S. Mikoshiba, T. Ueda, K. Kariya, ...Article type: Article
Pages 137-142
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRelations between the decay time constant of phosphor emission and gray scale disturbance are derived for color PDPs. As the persistence of the emission becomes longer, the disturbance becomes less perceptible. The long decay, however, widens the region of disturbance, in addition to manifesting the tails of moving images. The disturbance can be reduced by decreasing the light-emission duty factor, but within a limited extent. Since the amount of the disturbance depends on the phosphor decay time, false colors appear for color images if R, G, and B phosphor have different decay times.View full abstractDownload PDF (591K) -
T. Yamamoto, K. Ishii, T. Kurita, Y. Takano, T. Koura, H. Kokubun, K. ...Article type: Article
Pages 143-148
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe effect of new signal processing and driving methods introduced to 42-inch HDTV DC PDP to improve the moving picture quality are evaluated by both computer simulation and subjective evaluation of the moving picture. The result shows that proposed methods significantly improve the moving picture quality of an HDTV PDP receiver.View full abstractDownload PDF (657K) -
Article type: Appendix
Pages App1-
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (75K)
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