Kenji Awamoto

37.1: High-speed Address Driving Waveform Analysis Using Wall Voltage Transfer Function for Three Terminals and Vt Close Curve in Three-Electrode Surface-Discharge AC-PDPs

A new model of three-electrode surface-discharge AC-PDPs for driving waveform analysis and design was developed. A cell state is represented by a two-dimensional cell voltage vector, which is the sum of a wall voltage vector and an applied voltage vector. These vectors can be expressed on a plane of cell voltages, and the threshold cell voltages at firing are on a close curve on this plane. Using these concepts, wall voltages measurements, cell behavior at ramp setup, and the design of high-speed addressing waveforms are discussed.

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.

10.3: Analysis of a Weak Discharge of Ramp‐Wave Driving to Control Wall Voltage and Luminance in AC‐PDPs

We investigated a weak discharge of ramp-wave driving in AC-PDPs. A new interpretation of the wall voltage transfer curve for ramp-wave driving was introduced. Both the sweep-rate of ramp-waves and the priming affect wall voltage controllability. These effects can be explained by the turn-on characteristics of the transfer curve.

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.

30.4: Ramp Setup Design Technique in Three-electrode Surface-discharge AC-PDPs

A simple model to calculate changes in wall voltage during weak discharge in three-electrode ACPDPs was developed. A change in the wall voltage vector has an intrinsic direction for each discharge, which not only reveals the basis of problems in the ramp setup but also simplifies the analysis of cell operation during setup. New ramp-setup waveforms designed for this model widened the operating margin.

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.

Development of LPE-grown HgCdTe 64 x 64 FPA with a cutoff wavelength of 10.6 μm

We have developed a hybrid HgCdTe focal plane array (FPA) for wavelengths from 8 to 11 micrometers . We describe how we fabricated our back illuminated 64 X 64-element photodiode array on a liquid phase epitaxial (LPE) HgCdTe wafer, and a Si CCD multiplexer with line address readout. We optimized carrier concentration in the p-type HgCdTe layer to maximize charge injection efficiency to the Si CCD readout circuit to more than 99.3%. We achieved excellent uniformity of characteristics of the photodiode array, which is very important for an IRFPA, by using LPE HgCdTe grown with a tipping method, and passivating the photodiode array with an anodic sulfide of HgCdTe. We obtained an average product of zero-bias resistance and area (RoA) of 9.1 (Omega) cm2 with a cutoff wavelength of 10.6 micrometers at 77 K. We used line address readout to give a large charge storage capacity of 4 X 107 electrons. We estimated a noise equivalent temperature difference (NETD) of 0.08 K with F/2.5 optics, including fixed pattern noise. We tried some preliminary experiments to reduce the crosstalk from photogenerated carriers which spread laterally into the epitaxial layer. We improved the modulation transfer function (MTF) at Nyquist spatial frequency from the conventional 35% to 60% by using a crosswise drain structure around each photosensitive n+ on p diode.