AC Plasma Display Panel Research Articles

The Effect of Disordered Microscale Holes in the Front Dielectric Layer of AC Plasma Display Panels

Using polymethyl methacrylate (PMMA) beads, disordered microscale holes were fabricated in the front dielectric layer of ac plasma display panels. The density of the disordered microscale holes was easily controlled by varying the weight percentage of the PMMA beads. As their density increased, the voltage of self-erasing discharge and the minimum sustain voltage decreased. In addition, the sustain discharge time lag was improved according to the measurement results of the response time and spatiotemporal infrared emission from an intensified charge-coupled device camera. The wall voltage at the state of sustain discharge was investigated by measuring the threshold voltage using wall voltage measurement system. In the test panel of the front dielectric layer with disordered microscale holes, the wall voltage increased. In addition, the increase in the wall voltage at the state of sustain discharge was improved as the density of the disordered microscale holes increased. The decrease in the self-erasing discharge and minimum sustain voltage and the improvement of the sustain discharge time lag resulted from a strong electric field that originated in the increase in the wall voltage.

P‐91: AC Plasma Display Panel with Gold Nano‐particles Inserted into an MgO Protective Layer

AbstractA modified MgO structure incorporating gold nano‐particles is proposed in this work. By inserting gold nano‐particles into the MgO protective layer, dozens of nanometer‐scale bumps are created on its surface. The change in the morphology due to these bumps induces a higher secondary electron emission rate, which both increases the luminous efficacy and causes a 20 V reduction of the driving voltage.

P‐94: Long Time‐Discharge Characteristics of MgO Layer with Nano‐Powder in AC Plasma Display Panel

AbstractThe characteristics of the MgO layer are known to be an important parameter that affects both the stable address discharge and luminance characteristics in an ac‐PDP. In this paper, to enhance the long time‐discharge characteristics of 42‐in. ac‐PDP with an ternary gas compositions such as He‐Xe(17%)‐Ne, the effects of the nano‐powder on the MgO layer on the long‐time discharge characteristics are examined. As a result, it is observed that the MgO layer with nano‐power can enhance the long time‐discharge characteristics in an ac‐PDP.

A Study on the Long-Term Stability of the Discharge Characteristics by the Small Addition of Nitrogen to Ne–Xe Gas Mixture in AC Plasma Display Panel

In this paper, the long-term stability of the discharge characteristics in a plasma display panel is investigated with the small addition of nitrogen to the conventional Ne-Xe gas mixture. It is found that the characteristics of temporal variation in discharge voltages and full black brightness are enhanced with nitrogen gas addition, which could result in the reduction of mis-writing probability and the enhancement of image quality. In the study of the temporal variation of discharge voltages via a Vt close curve, it is observed that nitrogen addition suppresses the changes in discharge voltages. Regarding discharge voltage variation, the change in elements on the surface of the phosphor layer and the temporal modification of the protecting layer are investigated with overfrequency discharge aging using secondary-ion mass spectrometry and a scanning electron microscope, respectively. A small change in elements on the surface of the phosphor layer is observed in the panel, with nitrogen being added to the gas mixture. The reduced ion energy with the addition of nitrogen gas is suggested as a potential reason to induce the different variation of MgO transfer characteristics and discharge voltage.

Fe가 첨가된 MgO 보호막의 표면특성 개선에 관한 연구

플라즈마 디스플레이 패널(Plasma Display Panel : PDP)이 다른 평판 디스플레이 분야(Liquid Crystal Displays(LCDs) and organic light emitting diodes(OLEDs) 등)와 경쟁에서 이기기 위해서는 제품의 고화질화, 저소비전력와 고속구동 등의 성능향상이 필요하다. 본 논문에서는 PDP의 성능향상을 위하여 유전체 보호층으로 쓰이는 MgO 박막에 Fe를 미량 첨가한 박막을 증착하고, 그 특성에 대하여 연구하였다. e-beam 증착법으로 증착된 Fe 도핑 된 MgO 박막의 표면특성과 전기광학적 특성을 4인치 테스트 패널을 제작하여 연구하였다. Fe가 도핑된 MgO 박막을 가지는 PDP는 Fe가 도핑되지 않은 PDP에 비해 낮은 방전전압 특성을 나타내었으며, 이는 박막에서 측정된 2차전자방출계수의 실험결과와 잘 일치되었다. 증착된 박막의 결정성과 표면 거칠기는 XRD 와 AFM 측정방법을 통하여 결정되었다. 또한, Fe가 도핑된 PDP는 고속구동을 위한 향상된 어드레스 방전 늦음의 특성을 나타내었다.

An Investigation of the Temporal Dark-Image-Sticking Phenomenon in an AC Plasma Display Panel With an Auxiliary Electrode

In this paper, the temporal dark-image-sticking phenomenon in an AC plasma display panel (PDP) with an auxiliary electrode is investigated. To investigate this phenomenon, temporal behaviors of a black background image were observed in accordance with the sustain-discharge time and the relaxation time. Since dark image sticking is related to the reset discharge, our measurements focused on the reset period. In the case of an ac PDP with three electrodes, iterant sustain discharges induced an increase in black luminance, thereby leaving a residual image. However, in the case of an AC PDP with an auxiliary electrode, there was no variation of luminance between the states before and after the iterant sustain discharges. As a result, no residual image remained, and no distortion of the image could be recognized with the human eye, even after iterant sustain discharges.

A Simple Sustain Power Conversion Scheme for AC Plasma Display Panel

A simple sustain power conversion scheme for a plasma display panel (PDP) is proposed. The proposed scheme is comprised of two-stage power conversion. The power factor correction circuit converts ac line voltage into dc-link voltage and provides a high power factor while maintaining a constant dc-link voltage. The proposed sustain driver converts the dc-link voltage into the sinusoidal voltage generated by the resonant inverter. Since a sinusoidal voltage is applied to the panel, the charging or discharging surge current can be eliminated without using an energy recovery circuit. Also, the soft switching of the switching devices can be achieved by the resonant tank. Thus, the proposed sustain driver features fewer components and lower electromagnetic interference noise. Moreover, since the proposed sustain driver is implemented with a transformer, the dc-dc converter that is used to generate sustain power in the conventional sustain power conversion scheme can be eliminated. Therefore, the proposed sustain power conversion scheme features a simple structure and low cost. The operation principle and analysis of the proposed circuit is presented in detail. The performance of a 32-inch ac PDP equipped with the proposed driving scheme is investigated. The luminance efficacy of this scheme is over 10% better than that obtained by the conventional sustain driving scheme.

Study on Pulse Waveforms for Improving Voltage Margin and Luminous Efficacy in an AC Plasma Display Panel Having Auxiliary Electrodes

New pulse waveforms applied to an alternating-current plasma display panel (ac PDP) with an auxiliary electrode are investigated for the purpose of improving the panel's operating voltage margin and luminous efficacy. In the proposed pulse waveforms with reciprocal sustain pulses, a pair of positive and negative sustain pulses is applied to the sustain electrodes simultaneously and alternately. A positive auxiliary pulse is applied to the auxiliary electrode immediately after reciprocal sustain pulses. The voltage margin becomes wider, and the luminous efficacy is improved because of the suppression of the discharge toward the address electrode. In the another proposed pulse waveforms with reciprocal sustain and auxiliary pulses, a negative pulse, which is the same as the negative pulse of reciprocal sustain pulses, is additionally applied to the auxiliary electrode when reciprocal sustain pulses are applied. This negative auxiliary pulse can maintain a high level of luminous efficacy because it supports the effect of the auxiliary pulses. The measurement results show that the operating voltage margin is about twice wider than that of the typical pulse waveforms for an ac PDP with an auxiliary electrode; furthermore, the maximum luminous efficacy is able to reach 3.14 lm/W in terms of the measurement of the discharge in a 50-in XGA resolution (0.27 mm × 0.81 mm) panel with a white cell and a gas mixture of Ne+20%Xe.

Bipolar drive waveform for long-gap high-Xe plasma display panels

Abstract This paper proposes a drive waveform for plasma display panels (PDPs) which have a long discharge gap and use a high Xe-content discharge gas mixture. The proposed waveform uses bipolar sustain pulses, except for the last sustain pulse of each sub-field, to suppress undesired sustain discharges between facing electrodes; these sustain discharges degrade picture quality. The waveform uses a unipolar pulse for the last sustain to reduce the time lag of the address discharge. A reset waveform was designed for the long-gap high-Xe PDP and implemented in the drive waveform. The proposed waveform was tested on a 12% Xe 42-in. XGA (1024 × 768) single-scan AC PDP which had a sustain discharge gap of 180 μm. The measured dark luminance was 0.16 cd/m 2 , full-white luminance was 284 cd/m 2 , and luminous efficiency was 1.617 lm/W. The sustain voltage margin was higher than ±10 V at the operating point.

Analysis of Sustaining Waveforms for Improving Luminance and Luminous Efficacy in AC Plasma Display Panels

Wall voltage and priming particles are the main parameters to enable the improvement of luminance and luminous efficacy in AC plasma display panels. By moderately controlling the sustaining pulsewidth ( <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</sub> ) and the time interval between successive sustaining pulses ( <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</sub> ), the wall voltage and the amount of priming particles in the discharge space can be manipulated. In this brief, two types of sustaining waveforms, namely, negative- and positive-going pulses (which have different potential distributions during the off period), are investigated to analyze their effect on luminance and luminous efficacy. In both waveforms, the sustaining pulsewidths and the time intervals between the pulses have been varied to control the wall voltage and priming particles. Each sustaining waveform showed different trends in the resulting luminance and luminous efficacy with the sustaining pulsewidth and time intervals used. The <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</sub> time was a dominant factor in the negative-going pulse waveform, while the <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</sub> time was more important in the positive-going pulse waveform.

Analysis of the driving characteristics for an ACPDP with an auxiliary electrode using the voltage‐transfer closed surface

Abstract— The driving characteristics and wall‐charge model of an ac plasma‐display panel (ACPDP) with an auxiliary electrode were investigated by using voltage‐transfer closed‐surface modeling. To understand the wall‐charge behavior of an ACPDP with an auxiliary electrode qualitatively, voltage‐transfer closed‐surface analysis was applied to a test panel under the full driving waveform. The voltage‐transfer closed surfaces were obtained after the sustain, reset, and address periods, when the full‐stage driving waveform was employed with the test panel. As a result, it was proven that the wall‐charge model predicted in the previous work corresponded with the wall‐charge behavior of an ACPDP with an auxiliary electrode. Also, based on the resultant form after the address period, the wall‐charge model after the address period was recently added and the entire wall‐charge model was completed in this work. In addition, by investigating the trajectory of the cell‐state movement during the reset period, it was confirmed that the priming effect affected the reduced discharge time lag of an ACPDP with an auxiliary electrode under the newly proposed driving waveform for reducing address time lag.

Effects of Various Sustain Electrode Gaps on the Discharge Characteristics of an AC PDP With an Auxiliary Electrode

The effects of sustain electrode gap variation on discharge characteristics were investigated in an ac plasma display panel (PDP) with an auxiliary electrode. In this experiment, the following variations were used for the sustain electrode gap of the PDP with an auxiliary electrode: 120, 140, 170, and 200 mum. Static margin, IR intensity, luminance, and power density were measured and investigated in relation to the sustain electrode gap variation. In all the various sustain electrode gaps, when a proper pulse is applied to an auxiliary electrode, luminous efficacy exceeds the levels achieved in the case of a floated auxiliary electrode. In the case of the shorter sustain electrode gaps of 120 and 140 mum, the improved luminous efficacy is mostly due to an increase in luminance. In the case of the longer sustain electrode gaps of 170 and 200 mum, the improved luminous efficacy is mostly due to a decrease in power density. As the sustain electrode gap increases, the operating sustain voltage becomes higher. On the other hand, the luminous efficacy increases when a proper pulse is applied to the auxiliary electrode.

P‐92: Driving Waveforms for Improving Temporal Bright Image Sticking in AC Plasma Display Panel

AbstractThe iterant strong sustain discharge during a sustain period was known to induce an image sticking problem, but its detailed mechanism is not still fully understood. It is found that the rising slope of the sustain waveform has a significant influence on the recovery time of temporal bright image sticking. As a result, the recovery time of temporal bright image sticking is shortened considerably by properly controlling the rising slope of the sustain waveform.

An AC-PDP Single Sustaining Driver Employing the Voltage Stress Reduction Technique

The single sustaining driver (SSD) for an AC plasma display panel (AC-PDP) can simplify and optimize the circuit part of the PDP; however, it suffers from twice the high voltage stress of switches compared with the conventional sustaining driver. To solve this problem, a new SSD employing a voltage stress reduction technique is proposed. By adjusting the gate timing with the proposed simple structure, the voltage stresses of all devices are effectively ensured at the sustaining voltage.

A Study on MgO Characteristics of AC Plasma Display Panel Fabricated by Vacuum Sealing Method

In this paper, the vacuum sealing method to enhance a base vacuum level was adopted, and the resultant changes in the MgO characteristics, such as firing voltage, MgO sputtering rate, MgO hardness, and photoluminescence, were examined in comparison with those in the conventional sealing method in the 42-in. AC-PDP with a high Xe (15%) content. The 42-in. panel fabricated by the vacuum sealing method caused the changes in the MgO characteristics, such as firing voltage, MgO sputtering rate, MgO hardness, and photoluminescence, which are caused by an increase in the oxygen vacancy of the MgO layer.

An in-situ Study on Discharging Characteristics of an Alternative Current Plasma Display Panel Varied with Discharging Space

An in-situ experimental was carried out to analyze how the gap between a front and rear panel influenced on the discharging properties of an AC Plasma Display Panel (PDP). Initial firing voltages showed almost constant values except at the position of near the barrier rib as the gap increased. The fluctuations of sustain voltages became smaller dependent on the gap, and seemed to have a linear relation to the filtered IR at 828 nm. Observation on the Infra-red indicated the excited or the metastable species could be greatly affected by the rear panel regardless of the gap. Based on these results, we discussed a new method to evaluate dimensional fluctuation of an AC PDP.

Effects of Address-on-Time on Wall Voltage Variation during Address-Period in AC Plasma Display Panel

To explain the variation of the address discharge during an address period, the wall voltage variation during an address period was investigated as a function of the address-on-time by using the Vt closed curves. It was observed that the wall voltage between the scan and address electrodes was decreased with an increase in the address-on-time. It was also observed that the wall voltage variation during an address period strongly depended on the voltage difference between the scan and address electrodes. Based on this result, the modified driving waveform to raise the level of Vscanw, was proposed to minimize the voltage difference between the scan and address electrodes. However, the modified driving waveform resulted in the increase in the falling time of scan pulse. Finally, the overlapped double scan waveform was proposed to reduce a falling time of scan pulse under the raised voltage level of Vscanw, also.

ICCD Observation on Discharge Characteristics in AC Plasma Display Panel Prepared by Vacuum Sealing Process

The vacuum sealing process with a base vacuum of 10-5 Torr is adopted to minimize the residual impurity gas. The address and sustain discharges in the 42-in PDP prepared by the vacuum-sealing process are observed by using the ICCD. As a result, the ICCD observation illustrates that thanks to the reduction of the impurity level by the vacuum-sealing process, the surface and plate-gap discharges are initiated and extinguished very fast and the corresponding IR emissions are also intensified.

A new circular waveform for the three-electrode shadow mask PDP

A new type of ac-plasma display panel (PDP) with shadow mask (SMPDP) is presented with a cost effective structure. The standard SMPDP only includes two electrodes: a scan electrode and an address electrode, and the discharge is a vertical discharge between these two electrodes. A three-electrode SMPDP is described with increased design freedom to improved performance. A special circular waveform has been designed for the three-electrode SMPDP which is expected to result in a higher efficiency by combining the vertical discharge and the surface discharge.

Analysis of the Discharge Characteristics for Kr Gas Mixtures in an ac Plasma Display Panel

We investigated the discharge characteristics of a Kr gas mixture in an ac plasma display panel through two-dimensional numerical simulations. In a Ne-Kr gas mixture, the VUV output and the e cacy increase with higher Kr content due to an increase in the VUV source. In order to analyze the e ect of Kr content on the luminous characteristics for various gas mixtures, we compared the results for Ne-Kr, Ne-Kr-Xe and Ne-Xe mixtures. As the Kr content was decreased and the Xe content increased, the VUV generation e cacy increased because the lower energy level of the Xe excited state caused the generation of excited species to be more e ective than that of Kr gas.