Manabu Ishimoto

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.

25.2: Analysis of Deterioration of BaMgAl10O17:Eu2+ Phosphor for Plasma Display Panels

Using TEM, we studied the amorphous phase on a BaMgAl10O17:Eu2+ phosphor surface deteriorated by VUV irradiation. This paper describes growth of the amorphous phase and shows that irradiation from the a-axis of the phosphor crystal intensively increased the growth of the amorphous phase, compared with the results of irradiation from the c-axis.

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.

14.1: Invited Paper: Development of Plasma Tube Array Technology for Extra‐Large‐Area Displays

We developed the basic technology for a plasma tube array that could be used to produce emissive, extra-large-area displays. The cell design for high luminous efficacy was developed and luminous efficacy of 5.4 lm/W was achieved for a 20 cm test tubes array. Basic techniques, such as those to produce the tube structure, flexible electrode substrate, drive waveform, were also developed. A high luminous efficacy of 3.7 lm/W and lightweight of 0.6 kg were achieved for a 43-inches-diagonal test array.