Address Discharge Characteristics Research Articles

Address Discharge Characteristics by Changes in Sustain Pulse Numbers in Plasma Display Panel with High Xe Contents

The discharge characteristics, especially the address discharge characteristics, were examined relative to the number of sustain pulse from 2 to 200 applied during the prior sub field under the variable Xe gas conditions (11, 15, and 20%) of plasma display panels (PDPs). As the Xe contents increased from 11 to 20%, the formative delay time was observed to be increased. In particular, as the number of sustain pulse was increased from 2 to 200 during the prior sub field, the formative delay time of the subsequent address discharge was considerably increased under the high Xe (20%) content. Based on this experimental observation, the modified driving waveform, featuring being able to produce a stable address discharge irrespective of the sustain pulse number during the prior sub field, is proposed for the stable address discharge of the high Xe PDP.

Improvement on Address Discharge Characteristics for Overall Subfield Time Using Additional Scan Voltage in AC PDP

The address discharge time lags are investigated in each subfield time in AC PDP and shortened by changes in the amplitude of the additional scan voltage during total subfield time under the stable address voltage margin range. During the reset period, the reset discharge is produced by applying the high positive-going ramp voltage and the wall charge in a cell is generated. That wall charge plus the external address voltage induce the address discharge. In the first subfield time, the address discharge is fast produced than the other subfield times because the wall charge are much remained by the high positive-going ramp voltage during the reset period. Meanwhile, from the second to last subfield, the address discharge production time is gradually delayed due to the dissipation of the wall charge in a cell. In this study, the address discharge time lags are measured in each subfield time and the modified driving method to shorten the total address discharge time is proposed by applying the different additional scan voltages in each the subfield time.

Study on Address Discharge Characteristics Using Wall Charge on Three Electrodes during an Address Period in AC PDP

A modified driving waveform in AC plasma display panel is proposed to improve the address discharge characteristics applying the additional pulses on the sustain electrode during an address period. After a reset period in the driving scheme of an AC PDP, the electrons are accumulated on two front electrodes and the ions are accumulated on the address electrode. Among the accumulated wall charge on three electrodes, the electrons on the scan electrode and the ions on the address electrode are mainly used for the address discharge triggering when the scan and address pulses are applied simultaneously during an address period. Meanwhile, since the constant bias voltage on the sustain electrode is only maintained during an address period, the wall charge on the sustain electrode a little contribute to an address discharge triggering. In this sense, if the electrons on the sustain electrode during an address period are utilized, the improvement of the address discharge characteristics is expected. Therefore, in this study, the additional negative going pulses are applied to the sustain electrode while the scan and address voltages are changed during an address period. In addition, the address discharge characteristics are investigated in accordance with the various voltage height and pulse applying time. Consequently, the production time of an address discharge can be reduced approximately 200 ns under the optimal driving condition compared with the conventional driving waveform.

플라즈마 디스플레이의 개방형 유전체 구조에서 기입방전특성을 향상시키기 위한 Vt 폐곡선 분석

플라즈마 디스플레이의 개방형 유전체 구조에서 기입방전특성을 향상시키기 위한 Vt 폐곡선 분석

Sustain and Address Discharge Characteristics of AC-PDP with MgO Surface Coated by MgO Nano Crystal Powders

This paper examined the sustain and address discharge characteristics of ac-PDPs with MgO surface coated by MgO nano crystal powders. The MgO nano crystal powder was deposited by about 5% on the MgO surface by using the spray method. To investigate the effects of the partial addition of MgO nano crystal powders on the sustain discharge as well as the address discharge, the luminance, IR spectra of 823, 828 nm, cathodoluminance, and firing voltage were measured with the measurement of the address delay times and wall voltage variation in the 42-inch ac-PDP module with a high Xe content of 17%. As a result, the statistical delay characteristics were improved considerably especially under the low panel temperature of -5 degrees C for the MgO surface with MgO nano crystal powder. However, both MgO surfaces with and without the MgO nano crystal powder showed almost similar sustain and address discharge characteristics except the statistical delay characteristics.

플라즈마 디스플레이 패널에서 공통전극에서의 벽전하를 이용한 기입방전특성의 향상

A modified driving waveform is proposed to improve the address discharge characteristics using wall charge on the common electrodes in plasma display panel. In the driving scheme of plasma display, after a reset period, the negative charge are accumulated on two front electrodes and positive wall charge are accumulated on the address electrode. As the address discharge during an address period is produced when the scan and address pulses are applied at the same time, negative charge on the scan electrodes and positive charge on the address electrodes are mainly used. On the other hand, as the voltage are only maintained without applying the waveform during an address period on the common electrodes, the wall charge is not used on the common electrodes. In this paper, the address discharge characteristics are investigated with changing pulse applying time and applied voltage amplitude on the common electrodes and consequently the producing time of an address discharge are shortened about 200 ns compared with the conventional driving waveform.

교류형 플라즈마 디스플레이에서 선택적 초기화 방법에 의한 기입 방전 특성의 영향

The effect of address discharge characteristics by selective reset method is investigated to prevent the weakness of address discharge in the middle of a TV-field without increase of the black luminance. To reduce black luminance in AC PDP usually, the first subfield during one TV frame adopted the conventional rising ramp-reset waveform, whereas the other subfields adopted the subsidiary reset waveform without rising ramp type. As the wall charge for the address discharge was accumulated by only the rising ramp waveform during the first reset period, the wall charge on three electrodes was disappeared as time passed and the address discharge would be weakened in the rear subfields. To prevent a reduction of the address discharge characteristics without decrease the black luminance, the modified rising ramp reset waveform was adopted only in the sixth subfield. As a result, a modified driving method could improve the address discharge characteristics compared with selective reset driving scheme with almost the same black luminance.

개방형 유전체 구조를 갖는 교류형 플라즈마 디스플레이의 방전 특성 연구

The address discharge characteristics of a open dielectric structure compared with the conventional panel structure are investigated by measuring the discharge firing voltage. The open dielectric structure could easily produce the discharge between the scan and the sustain electrodes by erasing the dielectric layer between two electrodes. Due to the changes in the discharge firing characteristics of the open dielectric structure between the two sustain electrodes, the conventional reset waveform including the address waveform needs to be modified. The modified driving waveform suitable for the open dielectric structure is proposed and examined in AC PDP.

Effect of the Driving Waveform With Negative-Going Ramp on the Address Discharge Characteristics of Plasma Display Panel With High-Gamma Cathode Material

The address discharge characteristics of the plasma display with a MgO single cathode layer and the one with a MgO-SrO double cathode layer were investigated. In particular, the conventional waveform with a positive-going ramp and the proposed waveform with a negative-going ramp were applied in order to demonstrate that the polarity of the scan electrode during the reset period affects the dynamic voltage margin and the address discharge time lag. It was confirmed that the total address discharge time lag of the plasma display with the MgO-SrO double cathode layer decreased by about 550 ns by applying the proposed waveform with the negative-going ramp.

Investigation of Address Discharge and Efficiency Characteristics by Thickness of Phosphor Layer in Microplasma Cells

This paper analyzes the address discharge characteristics in the red, green, and blue cells, respectively by using the Vt closed-curve analysis method. To reduce the difference of the address discharge delay among the R, G, and B cells, the effects of the phosphor thickness on the address discharge delay are examined. By controlling properly the phosphor thickness among the R, G, and B cells, the difference of the address discharge delay is observed to be minimized among the R, G, and B cells. In addition, the luminous efficacy was observed to be improving by increase the phosphor layer thickness.

Numerical Analysis and Experiment on Discharge Characteristics Under Various Address Electrode Widths in AC Plasma Display Panel

The address-electrode width is an important parameter to affect both the address and sustain discharge characteristics in an ac-plasma display panels (ac-PDPs). It was numerically founded that as the address-electrode width was wider, the capacitance between the sustain and address electrodes (=CAY) increased, but the capacitance between the two sustain electrodes (=CXY) decreased. The resultant changes in the sustain and address discharge characteristics, such as a firing voltage, discharge delay time, and luminance, were examined in the 50 in ac-PDP with a high Xe (>11%) content. The increase in the address-electrode width caused an increase in the firing voltage between the sustain electrodes, which was mainly due to the decrease in the capacitance between two sustain electrodes and the increase in the wall charges accumulation toward the address electrode. In particular, the luminance was observed to increase with an increase in the address-electrode width. As the address-electrode width became broaden, the sustain discharge path was longer toward the address electrode, thereby enlarging the discharge volume. Therefore, it was observed that the IR (VUV) and Ne emissions were increased considerably. Furthermore, these experimental results were confirmed by simulating the electric field strength and Xe ion distribution in discharge cell with respect to the address-electrode width.

7.2: Fast‐Addressing Waveform with Negative‐Going Ramp for High‐Xe PDP with High‐Gamma Cathode Materials

AbstractIn this paper, the address discharge characteristics of high‐Xe PDPs with high‐gamma cathode materials were investigated. It will be shown that the address discharge characteristics such as the dynamic voltage margin and the address discharge time lag of high‐Xe PDP with MgO‐SrO double cathode layer and one with MgCaO single cathode layer can be improved by inducing stable, continuous weak discharges during the reset period with a newly designed waveform. The deposition of pure MgO powder on high gamma cathode material has also proved to be effective in reducing the address discharge time lag of high‐Xe PDP.

37.4: Analysis on Address Discharge Characteristics of MgO Layer with MgO Single Crystal Powder under Various Panel Temperatures in AC‐PDP

AbstractIt is known that the statistical delay time is improved drastically by using the MgO single crystal powders, irrespective of variable panel temperature. In this paper, to analyze the effects of the electric field on the emission characteristics of the MgO layer with MgO single crystal powder, the variations in the wall voltage induced by the electron emissions were measured relative to the electric field intensity between the A‐Y electrodes during address period. The measurement result confirms that the electron emission characteristics of the MgO layer with MgO single crystal powder strongly depend on the electric field intensity instead of the panel temperature.

Study on Address Discharge Characteristics by Changing Ramp-Down Voltage in AC PDPs

The address discharge characteristics formed when an address pulse is applied in AC plasma display panels are investigated by changing the ramp-down voltage during the reset period. The address discharge time lag can be reduced when the difference between the ramp-down voltage and the scan-low voltage is set at a high value during the ramp-down period because the loss of the wall charges accumulated between the scan (Y) and address (A) electrodes during the reset period is minimized. In addition, the voltage applied to the X electrode during the ramp-down period can prevent the voltage margin from reduction even though applying high voltage difference on the Y electrodes.

Temperature-Adaptive Driving Waveform With Multiscan High Voltages for Stable Address Discharge in AC Plasma Display Panel

The discharge characteristics, particularly the address discharge characteristics, were examined relative to an ambient temperature from -5°C to +65°C in an ac plasma display panel. As the ambient temperature increased, the statistical delay time decreased due to an increase in the exoelectron emission from the MgO surface by thermal activation. In contrast, the formative delay time increased due to an increase in the wall voltage variation during an address period. It was also found that the wall voltage variation during an address period depended on the level of the scan high voltage. Therefore, a temperature-adaptive driving waveform with multiscan high voltages is proposed to produce a stable address discharge irrespective of a variable ambient temperature.

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.

7.2: Address Discharge Characteristics of High Luminous Efficacy PDP with SrO Protecting Layer

AbstractWe have achieved low voltage driving and high luminous efficacy by applying SrO protecting layer in PDP. Especially its low voltage characteristics can make it possible to use very high Xe content such as 30% gas at the voltage levels which currently commercialized PDP use. The use of SrO protecting layer can reduce the firing voltage not only between sustain electrodes but also between address and scan electrodes, so that the threshold voltage VAY as well as the address delay in the SrO panel with Xe 30% could be made comparable to those in the MgO panel with Xe 10% with the appropriate modifications in the ramp reset waveform.

P‐131: Discharge Characteristics of Extra Pixel Assistance Structured (EPAS) AC‐PDP

AbstractWe have suggested an AC‐PDP with extra pixel assistance structure using a MgO layer made from nano‐powdered paste. This structure needs an own driving waveform at the end of conventional reset period for improvement of address discharge characteristics. It was demonstrated that the separated discharge space was coated by nano‐powdered MgO paste at rear plate for counter(X‐A) discharge between the sustaining and address electrodes. At this discharge, the priming particles can be supplied into the main discharge space. Therefore, address discharge characteristics can be expected to have faster response characteristics than those for the conventional structures of AC‐PDP.

A Study on Wall-Charge Behavior of Single-Sustain Waveform Based on $V_{t}$ Close-Curve Analysis in AC Plasma Display Panel

The wall-charge behaviors of the conventional and two types of single-sustain waveforms during address and sustain periods are investigated based on a simulated result and a Vt close-curve analysis. The single-sustain waveform means that the sustain pulse having both positive and negative voltage levels is applied only to the single-side electrode, i.e., the scan (Y) electrode in this paper, where the common (X) electrode remains grounded. In the single-sustain waveform, the address discharge characteristics were observed to be improved by applying a higher voltage level without causing a misfiring discharge during an address period. An asymmetric IR emission was observed for both positive and negative sustain pulses during a sustain period, which was caused by the simultaneous discharge, including the plate gap discharge between the scan (Y) and the address (A) electrodes only when applying the negative sustain pulse to the scan (Y) electrode.

P‐204L: Late‐News Poster: Analysis of Statistical Time Lags Based on Wall Charges Prior to Address Discharge Using Vt Close‐Curve Method for Full‐HD AC‐PDP

AbstractThe high speed address is an important parameter to lower cost technology for the realization of full HD‐PDP. The wall charge supplied from the reset period is an important factor for affecting the fast and stable discharge characteristics during an address period. It is found that as the voltage level of the negative falling ramp in the reset waveform is lower, the accumulated wall charges during the ramp‐up period are more erased, thus reducing the amounts of wall charges prior to address discharge. The resultant changes in the address discharge characteristics were examined in the 42‐in. ac‐PDP with a high Xe (11 %) content. In particular, the measured Vt close‐curves and corresponding IR emission profiles show that less amounts of wall charges prior to an address discharge induce the decrease in the statistical time lag and total address discharge time lag in address period, thereby resulting in the stable and fast addressing. Therefore, it is advantageous to use the electric field from the applied voltage during an address discharge instead of utilizing the wall charges from the reset period for the stable and fast addressing.