Tsutae Shinoda

Development of panel structure for a high-resolution 21-in-diagonal full-color surface-discharge plasma display panel

Plasma display panel (PDP) structure has been investigated to develop a 21-in-diagonal color plasma display with a high-resolution of 0.22-mm subpixel pitch. To realize a high-resolution display, a stripe alignment of three primary color elements such as red, blue, and green, was introduced. Four kinds of panel structures are compared and finally stripe rib and stripe phosphor structures were introduced for the three electrode surface discharge plasma display. The 21-in-plasma display developed with the structure has firstly been put into the market with sufficient performance, such as a wide operating voltage margin, a high luminance, and a wide viewing angle of more than 60 V, 200 cd/m/sup 2/, and 160/spl deg/, respectively.

Plasma display technologies for large area screen and cost reduction

In this paper, the basic technologies of alternating current (ac) plasma display panel (PDP) and the next-generation technologies are described. The panel structure of reflective type and three electrodes with surface discharge, and the basic operation of address display-period separation (ADS) subfield method have been developed for PDP products, and these basic technologies have the capabilities which can respond to next-generation development, such as high luminous efficacy, low cost, and enlargement of the screen size. In the recent research, the technologies that provide three times the luminous efficacy comparing with that of latest PDP products and innovative manufacturing process technologies for drastic cost reduction have already been developed. How we install the new technologies in the products is an important subject. PDPs will keep advantages in a large screen flat panel display market by the technical development for the next-generation in each field.

35.4: New Approach for Wall Display with Fine Plasma Tube Array Technology

A wall-sized emissive full-color display with fine plasma tubes using three electrodes is proposed. Each tube has an internal MgO overcoat and a phosphor layer. The experimental display was fabricated and the results will be presented. This method will realize a display with a flexible screen shape and an expandable screen size.

P‐25: Secondary ‐Electron‐Emission Analysis of MgO Films in ac Plasma Displays

The ion-induced secondary-electron-emission yield of MgO films by the ion gun method was successfully measured. Variations due to crystal orientation and ion kinetic energy were observed. Ejected electron energy showed correlation with the ionization energy of the gas.

5.3: Discharge Observation of Plasma Tubes

The plasma tube array display presents the wall size display with very high luminous efficacy. Discharging in plasma tube was observed to estimate the structure for high luminous efficacy. From the results of the observation, it is estimated that not only the discharge gap but also the discharge cavity effects to the luminous efficacy. With this result new structure was tries and 3.7 lm/W was achieved as the luminous efficacy.

A light and flexible plasma tube array with a film substrate

— The plasma tube array is expected to lead to the realization of wall-sized displays. This method will realize an emissive-type display with a flexible screen and an expandable screen size. We have investigated a plastic film substrate with display electrodes for use as a flexible screen and successfully developed the worlds largest bendable emissive display (1000 × 128 mm). The operating voltage distribution was improved compared to that with a plate substrate, and a sufficient voltage margin was maintained.

Developments of Plasma Tubes Array Technology for Extra Large Area Film Display

Plasma tubes array is a film display that is able to realize an extra large area emissive display, and also be expected to realize the new industrial applications of wall size display because of its attractive characteristics such as ultra-thin, lightweight, flexible and low power consumption. We had successfully developed a prototype display of 3 m × 2 m screen size which consisted of 6 of 1 m × 1 m sub-modules with seamless connected structure. The weight, thickness and power consumption of the display film were 7.5 kg, 1 mm, and 1200 W, respectively. It enables people to get an immersive experience with high quality real-size images shown on this display, which opens a door to the new world of natural communication in a virtual environment.

18.3: Dynamic Driving Characteristics of Plasma Tubes Array

The plasma tubes array is expected to realize the wall size display. However, as a reflection of our tube designing policy for high luminous efficacy, the basic electrical characteristics of plasma tubes array are different from those of conventional PDPs. Some new driving technologies were developed to make the dynamic driving sequence for conventional PDPs adoptable for this high efficacy plasma tubes array. With these results, a full-colour 1m by 128 mm tubes array composed of 128 plasma tubes with the luminous efficacy of 3.1 lm/W was developed.

34.2: Invited Paper: Development of 1m × 2m Plasma Tube Array PTA Technologies Ready for Ultra-Large Film Display

The plasma tubes array is expected to realize the next generation of wall size display because of its wonderful characteristics such as ultra-thin, light-weight, flexible and low power consumption. We had successfully developed a prototype film display of 1m × 2m screen size which was consisted of 4 sub-modules of 0.5m × 1m with the seam width under 1mm. The weight, thickness and power consumption of the film display were measured at 2.5kg, 1mm and 400W respectively.

High-luminous-efficacy structure for plasma tubes

— The plasma-tube-array display is expected to become a wall-sized display with very high luminous efficacy. The cell design for high luminous efficacy was investigated. Also, discharging in the plasma tube was observed in order to investigate the structure for high luminous efficacy. As the result, a high luminous efficacy of 5.4 lm/W was achieved.