Three-electrode-per-pel AC plasma display panel

A new ac plasma display technique is described in which the alternating sustain function is achieved on the back or substrate glass surface and thex-yselected write-addressing uses a transparent front cover electrode and a substrate electrode. The three-electrode-per-pel structure achieves high overall emission efficiency as a result of nonshielded sustain discharges and low electrode capacitances.     

交流彩色等离子体显示板的结构

介绍了ＡＣ－ＰＤＰ结构的改进过程和近期研究的新进展，等离子体显示板结构的改进对于其性能的提高起到了至关重要的作用。     

Multilevel voltage wave-shaping display driver for AC plasma display panel application

A new sustainer circuit with multilevel voltage wave-shaping characteristics for an AC plasma display panel (AC-PDP) drive is proposed. The proposed circuit features half the device voltage stresses and significantly reduced power losses compared with those of the conventional ones. This circuit, realizable without much increased cost of the semiconductor devices, gives a significant improvement in the power efficiency, essential for the design of a drive circuit for the AC-PDP. A comparative analysis and experimental results are presented to show the validity of the proposed sustainer circuit.     

A real-time curve tracer for the AC plasma display panel

A minicomputer-controlled system is used to automatically measure the wall charge transfer curve of a single cell in an ac plasma display panel. Curves can be plotted on a graphics display as fast as 5/s which allows real-time interaction with the user. The measurement technique is based on the ability to directly measure the wall charge from a single cell. The minicomputer controls the sustain voltage across the cell and obtains the resulting wall charge. It then does the tedious algebra needed to complete the transfer curve. The measured curves show numerous interesting effects. The influence of the state of the neighboring cells can clearly be seen. The duty factor of the sustain waveform has a strong influence on the transfer curve. An effect dependent on sustain frequency is presented that shows a transfer curve region with negative slope. The most interesting effect measured is a hysteresis in the transfer curve, in that a different curve is traced out as the cell goes from off to on than when it goes from on to off.     

Electron transport self-shift display using an AC plasma panel

Using an electron transport mechanism, a self-shift display has been successfully implemented on an ac plasma panel providing higher resolution, higher shifting speed, and wider operating margins than previously obtained. The mechanism consists of a unidirectional and efficient transport of a large portion of electrons (generated during the display site discharge) to a neighboring OFF transfer site by a low transverse voltage. The process results in a large wall voltage build-up at the transfer site to switch its state from OFF to ON. The implemented electron transport self-shift display consists of a 7 × 128 site array of an Owens-Illinois 60 lines per inch panel where the 128 columns are driven by a four-phase driver. A resolution of one display site for every two electrodes and a shifting speed better than 600 characters per second have been successfully demonstrated. The ranges of the shifting voltages VDand VTare better than 15 V over a 10-V sustain range. The shifting operation also was successfully demonstrated on an 83 lines per inch panel with good operating margins.     

On the stability of the operating voltages of AC plasma display panel

It is shown that doping MgO films with a transition metal, such as nickel, results in a statistically significant improvement in the stability of the operating voltages of an ac plasma display panel. Experimental results can be explained in terms of the effect of excess oxygen in the films on their surface properties, and the changes in the surface properties produced by ion bombardment during the discharge.     

Origin of the bistable voltage margin in the AC plasma display panel

Bistability in gas-discharge cells is discussed from a general viewpoint. The physical mechanisms controlling the extent of this bistable range are examined by performing numerical simulations of the discharge dynamics in ac plasma panel cells under various assumed conditions. For the particular case of the commonly used neon + 0.1-percent argon mixture, the results give realistic bistable operating margins only when all three of the following conditions are satisfied: 1)incorporation of the electric-field distortion due to space charge; 2) inclusion of the dependence of the secondary-emission coefficient, γ, on the reduced electric field,E_{c}/p_{0}, at the cathode; and 3) assumption of an insignificant value of γ for argon ions in comparison to that for neon ions.     

Surface-discharge-type plasma display panel

The surface-discharge type plasma display panel does not require accurate spacing between two plates. Also, the number of manufacturing processes can be reduced to nearly half those required for opposed-discharge-type panels, resulting in low cost. The relationship between the principal design factors of a surface-discharge-type panel and the firing voltage in the nonmemory mode is discussed, based upon experiments and calculations from an equivalent circuit. Furthermore, by making use of the fact that one side of the panel is simply a cover glass for the gas space, it is possible to obtain green emission by coating a phosphor on the inside surface of the cover glass. In this arrangement, degradation of the phosphor by ion bombardment seldom occurs and long life panels can be achieved.     

Measurement of a plasma in the AC plasma display panel using RF capacitance and microwave techniques

The existence of a long-lived plasma in the gas volume is demonstrated by two techniques. By using a suitable RF frequency, the capacitance of plasma cells is shown to vary due to the production and decay of the plasma. In a special large-area cell constructed to minimize stray-capacitance problems, the plasma caused the capacitance to increase by a factor of 7 over the neutral value. This means that at the peak, the plasma filled about 6/7 of the discharge gap. By constructing a special-geometry plasma cell in the shape of a strip-transmission line, the microwave transmission properties were determined at 10 GHz. When the plasma is in the volume, the transmission is cut off. There is strong correlation between the capacitance variation and the microwave transmission variation. Depending on various conditions, the two techniques show the plasma to exist between 10 and 100 µs after the discharge-current peak. The plasma can be swept out of the volume by either positive- or negative-going applied voltage pulses. Thus the plasma is usually swept out upon the fall of the sustain voltage, especially when the sustain duty factor is less than 100 percent.     

LSI-Direct-controlled plasma display panel

A plasma display panel with auxiliary discharge cells to control the display cells has been developed. The panel can be directly controlled by low-voltage MOS-LSI switching circuits.     

An energy-recovery sustaining driver with discharge currentcompensation for AC plasma display panel

A novel driver with discharge current compensation is proposed to drive an AC plasma display panel (PDP). This proposed circuit uses resonance between the inductor and the AC PDP to avoid abrupt charging/discharging. The four switches of the full bridge are all operated with zero-voltage-switching turn-on. In addition, an 8-in AC PDP equipped with the proposed driving circuit, operating at 100 kHz, is investigated. With the discharge current compensation, the experimental results show that the proposed driver can maintain the AC PDP to light at lower voltage (129 V)     

High-speed driving method using bipolar scan waveform in AC plasma display panel

This paper proposes a new high-speed driving method using the bipolar scan waveform with a scan width of 1 /spl mu/s in an ac-plasma display panel. The bipolar scan waveform in an address period consists of a two-step pulse with two different polarities, i.e., a forward scan pulse with a negative polarity and reverse scan pulse with a positive polarity, which can produce two address discharges, including a primary address discharge for generating wall charges and secondary address discharge for accumulating wall charges. To produce the fast address discharge stably using the bipolar scan pulse during an address period, a new reset waveform is designed based on a V/sub t/ close curve analysis, and the address discharge characteristics examined under various reset and address waveforms. As a result of adopting the proposed driving method, a high-speed address with a scan width of 1 /spl mu/s is successfully obtained when using a checkered pattern on a 4-in test panel.     

EXPERIMENTAL RESEARCH OF ELECTRO-OPTICAL CHARACTERISTICS OF NOBLE GASES IN AC PLASMA DISPLAY PANEL

Luminous spectra and electric characteristics of gas mixtures:Ar+He,Kr+He,He+Ne,He+Xe,Kr+Ar and Ar+Hg are investigated in order to find out a kind of gas mixture radiatingblue-green light.It was shown in the investigation that the gas mixture of Ar+Hg,which radiates blue-greenlight,and has higher brightness and lower firing voltage,is more satisfactory.     

Improve the luminous efficiency of AC plasma display by high-frequency driving on address electrodes

A novel high-frequency driving scheme was proposed in this paper to improve the luminous efficiency of a plasma display. High-frequency oscillating waveform was applied to the address electrodes of the conventional three-electrodes AC-type plasma display panel during the sustaining period. More vacuum ultraviolet rays were generated by the high-frequency waveform so that the luminance and luminous efficiency could be enhanced. From experiments on an 8.5-in panel, the luminance was improved and the luminous efficiency was enhanced more than 40%.     

Fault-tolerant voltage-fed PWM inverter AC motor drive systems

This paper shows how to integrate fault compensation strategies into two different types of configurations of induction motor drive systems. The proposed strategies provide compensation for open-circuit and short-circuit failures occurring in the converter power devices. The fault compensation is achieved by reconfiguring the power converter topology with the help of isolating and connecting devices. These devices are used to redefine the post-fault converter topology. This allows for continuous free operation of the drive after isolation of the faulty power switches in the converter. Experimental results demonstrate the validity of the proposed systems.     

Novel resonant pole inverter for brushless DC motor drive system

The brushless dc motor (BDCM) has been widely used in industrial applications because of its low inertia, fast response, high power density, high reliability, and maintenance-free reputation. It is usually supplied by a hard-switching pulse width modulation inverter, which normally displays relative low efficiency since the power losses across the switching devices are high. In order to reduce the losses, many soft switching inverters have been designed. However, these inverters have such disadvantages as high device voltage stress, large dc link voltage ripple, discrete pulse modulation, and complex control scheme. This paper introduces a novel resonant pole inverter, which is unique to a BDCM drive system, and is easy to implement. The inverter possesses the advantages of low switching power loss, low inductor power loss, low device voltage stress, and simple control scheme. The operation principle of the inverter is analyzed. Simulation and experimental results are proposed to verify the theoretical analysis.     

The current injection method for AC plasma display panel (PDP) sustainer

A new concept of energy recovery for a plasma display panel (PDP) is proposed. Different from conventional LC resonant sustaining drivers, the current built up before inverting the polarity of the panel electrodes is utilized to change the panel polarity together with energy previously charged in panel capacitance. This operation provides zero-voltage switching of switches and reduction of electromagnetic interference by rejecting the surge current when the sustain switches are turned on. The buildup current helps to reduce the transition time of the panel polarity and may produce more stable light waveforms. This method is suitable for a PDP sustaining driver requiring stable light emission characteristic while it maintains low circuit loss like the series-resonant-type energy recovery circuit which is known to be a very effective method.     

Optical write-in for the plasma display panel

Techniques of changing the state of plasma display cells with externally applied light are presented. Optical write-in offers the advantage of high-speed parallel data transfer from a photographic transparency to a plasma display panel. It is established that light incident on a plasma cell causes a photoemission from the inner glass surface. The emitted electrons perturb the wall voltage and cause a change in state. The intensity of light needed to change the state of cells can be reduced, without changing the solid panel materials, by two techniques, Electron avalanches initiated by the photoelectrons can be used to decrease the light needed by a factor of 100. By flashing light during the plasma display cell gas discharge, the intensity of the light can be further reduced.     

High performance and low-cost single switch energy-recovery sustaining driver for AC plasma display panel

A new energy-recovery sustaining driver for an AC plasma display panel (PDP) is proposed. Since it has only one auxiliary switch compared with the four of the prior circuit, its size and cost can be greatly reduced. Moreover, it features the fast transition time of the panel polarity, fully charged and discharged PDP and soft switching of all power switches.     

交流彩色等离子体显示器（Ⅰ）

彩色等离子体显示器具有许多独特的特点，最适宜用于大屏幕壁挂高清晰度电视。从目前的技术发展状况看，单基板表面放电型ＡＣＰＰ最具潜力。本文详细分析了ＡＣＰＤＰ的工作原理和采用的多种关键技术，并对彩色ＰＤＰ的发展前景作了展望。