One of the problems for surface discharge PDPs is a short life for practical use. To clarify this problem, the shape of MgO surface was observed by SEM, and analyzed by XMA. It appears that the MgO above the sustaining electrodes disappears by Xe ion bombardment during the life time test. The increase In sustaining voltage value is caused by the disappearance of MgO. The relation between sputtering rate and the Xe ion Mobility is examined to obtain long life performance PDPs.

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The practical 256 gray scale technology for the ac plasma panel has been developed through the ADS sub-field method and the newly introduced low voltage addressing technology. Performance of a 21 inch full color plasma display with 640×3×480 line and the integrated electronics using monolithic drivers will be presented.

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As a first step towards realization of a hung-on-a-wall Hi-Vision display with the pulse memory drive scheme which makes it possible to reproduce bright color pictures on DC PDPs, five kinds of hybrid ICs for driving electrodes have been developed by using commercial ICs. The s e ICs could make electrode driving and interface circuits, by which signals from processors could be transferred to the electrode circuits, compact by By the one third of conventional ones using many discrete parts. introduction of these ICs, the thickness of a newly-developed 40-inch panel This result makes it clear that display system could be reduced to 8cm. a hung-on-a-wall Hi-Vision display with PDP can be produced in near future.

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Plasma display panels, we call them PDPs, are one of the flat panel displays, which make use of dischsrge phenomenon for indication. Color indication panels make use of photluminescence that was excited and emitted a fluorescent substance by ultraviolet rays. Therefore, informations that were connected with ultraviolet rays are importantfor higher brightness and luminous efficiency that ale problems for color panels utility, In this experiment, Ne+Xe gas was used for working gas and we measured about spectra emitted from the states concerned with ultraviolet rays emission of 1470 Å by two- and three-phase driving method.

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It is required to form MgO protecting layer in ac plasma displays by means of a sputtering method and a thick film printing technology which are appropriate for simplifying production process and fabricating a large size of displays. Our research and development were focused on fabricating MgO layer by using a screen printing method. Testing panels with screen-printed MgO films were fabricated by using various kinds of our developed MgO pastes. The basic characteristics of panels were measured and analysis comparison of them were investigated by using SEM. ESCA, XRD. Newly developed MgO paste of T-5 showed excellent characteristics of low sustaining voltage, wide memory margin, high luminous efficiency, and stable operation for long time.

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We have fabricated two kinds of Si LEDS consisting of n-type microcrystalline SiC / porous Si / p-type crystalline Si pn junctions, and demonstrated a visible light emission from them. We also investigated the origin of the photoluminescence of porous Si, and found that there were two luminescent states in porous Si: a weak luminescent quantum confinements state and a strong luminescent surface state.

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A 96×64-dot large-scale RGB multi-color LED display (732 mm.×488 mm (W×H)) has been developed by using bright, full-color LED lamps. The display is composed of 24 compact modules (16×16 dots) and reproduces moving images in seven colors (red, amber, yellow, green, blue, pink and white). With an excellent white luminance level of 140 cd/m^2, the display is suitable for indoor use and dimly lit outdoor conditions.

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The FED has a very high degree of redundancy because a pixel of the FED consists of the high density of microtips, the characteristics of high speed addressability and low power consumption. In order to investigate the basic characteristics of the field emission. Which are important for development of the FED, we measured the field emission current from a needle-shaped tungsten emitter and the energy distribution by using an ac retarding field method. Besides, we tried to fabricate silicon field emitter arrays (FEAs) by wet etching.

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A 20φ-lighting-element has been studied to perform low power, low cost and high luminescent large display by improving a flood beam CRT. In this paper,the phosphor screen, the bulb material and the cathode construction were studied, so that a new composition was proposed to approach the final goal.

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For higher resolution and higher brightness of color CRTs, improvement of the axially-nonsymmtric OLF(Overlapping Field) main lens design has been investigated by means of three-dimensional simulations combined with experiments. Both the spike-like haze of the high-current spot and the spread of spot astigmatism among tubes are markedly reduced with a lens design using a flat-plate field-forming electrode instead of the conventional strip-type ones.

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A new in-line electron gun has been developed for 16:9 aspect ratio, 106° deflection, 32.5 mm neck HDTV color CRTs with a self-converging yoke. This gun uses an enlarged overlapping-field type mainlens of 10.5 mm diameter, aberration reducing triode with a low focus voltage to anode voltage ratio of 21%, and dynamic astigmatism and focus correction system with double quadrupole lenses. A markedly reduced spot size at the screen center is obtained as well as an improved distortion of the spot shape during deflection with the new gun.

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The focusing characteristics of a 6.9 inch projection CRT having a combined electromagnetic and electrostatic focusing system was improved for applying it to a HDTV display. To improve the focusing characteristics, the densely packed phosphor screen with less a screen spot growth due to a light scattering inside a phosphor screen was newly developed, and an UPF electron gun was optimally designed. In addition, the new green phosphor was used to improve the brightness characteristics. As a result, a screen spot diameters of 0.15 mm and 0.35 mm were achieved at the cathode currents of 0.5 mA and 5.0 mA, respectively. A brightness of 1.3×10<-5> cd/m^2 was also achieved at the cathode current of 5.0 mA. Furthemore, the 46 inch trial set that composed of this projection CRT achieved the 900 TV lines in horizontal resolution, and 1500 cd/m^2 in peak brightness. Thus, this projection CRT will contribute to better HDTV displays.

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