Address Discharge Characteristics Research Articles

55.4: Influence of He Contents on Reset and Address Discharge Characteristics Under Variable Panel Temperature in ac PDPs

AbstractThe effects of He content in He‐Ne‐Xe (11 %) on the reset and address discharges were examined under variable panel temperature ranging from −5 to +65°C. The changes in the firing voltages under the X‐Y surface or the A‐Y plate‐gap discharges were measured using the Vt close‐curve method when the He contents and panel temperature were varied. Under the variable panel temperature condition, the IR emission intensities were also monitored during the reset and address discharges when the He contents were varied from 0 to 50 %. It was observed that as the panel temperature was increased, the higher He content could facilitate the reset and address discharges.

55.3: Study on Address Discharge Characteristics Using Vt Close‐Curve Analysis in ac PDPs

AbstractThe address discharge characteristics by the various scan‐low and common‐bias voltages are investigated based on measured address discharge time lags and Vt close‐curve analysis. The scan‐low voltages are changed with the same voltage difference between the X and Y electrodes during an address period, meaning that the voltage difference between the scan‐low voltage applied to the Y electrode and the common‐bias voltage applied to the X electrode remains constant even though each voltage level changes. As the voltage difference between the scan and address electrodes is increased during an address period, the address discharge time lag is shortened but a high background luminance is induced. It is found that the improved address discharge characteristics is caused by the effect of the higher external applied voltage during an address period than the accumulated wall charges during a reset period and the high background luminance can be prevented by applying an address‐bias voltage during a rising‐ramp period.

Driving waveform for reducing temporal dark image sticking in AC plasma display panel based on perceived luminance

Minimizing the reset discharge produced under an MgO-cathode condition and eliminating the wall charges accumulated on the address electrode prior to the reset period are the key factors involved in reducing temporal dark image sticking. Thus, based on the perceived luminance, new driving waveforms that can prohibit an MgO-cathode induced reset discharge or erase the wall charges accumulated on the address electrode prior to the reset period are examined for the complete elimination of temporal dark image sticking without deteriorating the address discharge characteristics. As a result of monitoring the difference in the infrared emission and perceived luminance between the cells with and without image sticking, the proposed driving waveform was shown to effectively remove temporal dark image sticking without deteriorating the address discharge characteristics

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.

P-99: Effects of Width of Address Electrode on Sustain and Address Discharge Characteristics in AC Plasma Display Panel

The width of an address electrode is an important parameter to affect both the address and sustain discharge characteristics in AC-PDP. It is found numerically that as the width of an address electrode is wider, the capacitance between the sustain and address electrodes (CAY) increases but the capacitance between the two sustain electrodes (CXY) decreases. The resultant changes in the sustain and address discharge characteristics, such as a firing voltage, sustain voltage, discharge delay time and full-white luminance were examined in the 50-in. ac-PDP with a high Xe (>10 %) content. The increase in the address electrode width causes an increase in the firing and sustain voltage between the sustain electrodes, which are 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 full-white luminance increases with an increase in the address electrode width. As the address electrode width becomes broaden, the sustain discharge path is lengthened toward the address electrode and the discharge volume is also enlarged. Therefore, the amount of the IR, VUV and Ne rays can be emitted considerably.

6.1: A Study on Wall Charge Behavior of Single Sustain Waveform Based on Vt Close Curve Analysis in AC-PDP

The wall charge behavior of the conventional and two types of single sustain waveforms are investigated based on a simulated result and Vt close curve analysis. The single sustain waveform means that the sustain voltage was alternately applied to the negative and positive voltage level on the single side electrode, that is, the scan (Y) electrode in this paper, where the common (X) electrode remains grounded. In the single sustain waveforms, the address discharge characteristics were improved during an address-period and an asymmetric intensity of the IR emission waveform was produced during a sustain-period compared with the conventional driving waveform. It was found that the improved address discharge characteristics was caused by the effect of the higher external applied voltage during an address-period than the accumulated wall charges during a reset-period, and an asymmetric IR intensity during a sustain-period was due to the simultaneous discharge including the plate gap discharge between Y and A electrode when applying the negative sustain pulse to the Y electrode.

P-106: Improvement of Luminance and Luminous Efficiency Using New Negative Sustain Waveform in AC-Plasma Display Panel

A new negative sustain waveform is proposed to improve the sustain and address discharge characteristics of PDP. The effects of conventional positive and proposed negative sustain waveforms on the sustain and address discharge characteristics are examined and compared in the 7-in. test panel with a Ne-Xe (4 %), gas mixture at 100 kHz. In the case of adopting the proposed negative sustain waveform, the luminance and luminous efficiency were improved by about 10 % and 16 %, respectively.

Dual-Slope Ramp Reset Waveform to Improve Dark Room Contrast Ratio in AC PDPs

A new dual-slope ramp (DSR) reset waveform is proposed to improve the dark room contrast ratio in AC-PDPs. The proposed reset waveform has two different voltage slopes during a ramp-up period. The first voltage slope lower than the conventional ramp voltage slope plays a role in producing the priming particles under the low background luminance, which is considered to be a kind of pre-reset discharge. On the other hand, the second voltage slope higher than the conventional ramp voltage . slope produces a stable reset discharge due to the presence of the priming particles, but gives rise to a slight increase in the background luminance. Thus, a bias voltage is also applied during a part of the second voltage-slope period to adjust the background luminance and address discharge characteristics. As a result, the proposed dual-slope reset waveform can lower the background luminance without causing the discharge instability, thereby improving the high dark room contrast ratio of an AC-PDP without reducing the address voltage margin.

Reset-While-Address (RWA) Driving Scheme for High-Speed Address in AC Plasma Display Panel With High Xe Content

A new reset while-address (RWA) driving scheme for a single scan of an XGA grade (1024 /spl times/ 768) ac-plasma display panel (PDP) is proposed to improve the address discharge characteristics with a high Xe gas mixture (15%). To solve the conventional address problem of the gradual decrease in priming particles during an address period, the falling ramp waveform in the reset period is separated into two parts; the first part is applied at the beginning of the reset period and provides the priming particles during the first half of the address period, while the second part is applied in the middle of the address period to provide an additional supply of priming particles during the second half of the address period. As a result of adopting the proposed RWA driving scheme, address discharges were successfully produced within a 1.0-/spl mu/s pulsewidth due to the presence of priming particles throughout the address period.

Analysis of Influence of Address Electrode Width on Address Discharge Characteristics Using Threshold Voltage Closed Curve

In order to drive high-density plasma displays, one TV field should effectively be composed of reset, address, and sustain periods and the display quality should be improved. Therefore, we must study high-speed driving technology. In this paper, we will show the relationship between the width of the address electrode and high-speed drive using the threshold voltage (Vt) closed curve and will propose the panel structure for high-speed driving. In these experiments, we will show that the wider the address electrode is, the narrower the width of the scan pulse becomes. Therefore, we could achieve the dynamic data voltage margin of 16.4 V at a scan pulse width of 0.8 µs and a ramp voltage of 220 V at an address electrode width of 180 µm for a high-speed-drive 4-in. test PDP.

Improvement of address discharge characteristics using asymmetric variable-width scan waveform in ac plasma display panel

A new asymmetric variable-width scan waveform is proposed to improve the characteristics of an address discharge, including a reduced address time and increased dynamic voltage margin, based on the formative and statistical time lags of an address discharge in an ac-plasma display panel (ac-PDP). The new asymmetric variable-width scan waveform has a progressively increasing scan pulsewidth that is wider than the address pulsewidth, thereby enabling stable wall charge accumulation under short address pulsewidth conditions. When adopting this new scan waveform, the address pulsewidth was reduced from 3.0 to 1.4 /spl mu/s and the address voltage lowered from 65 to 55 V without any misfiring problem at an address pulsewidth of 1.4 /spl mu/s.