Analysis Of Closed Curves Research Articles

플라즈마 디스플레이의 개방형 유전체 구조에서 기입방전특성을 향상시키기 위한 Vt 폐곡선 분석

플라즈마 디스플레이의 개방형 유전체 구조에서 기입방전특성을 향상시키기 위한 Vt 폐곡선 분석

교류형 플라즈마 디스플레이에서 Vt 폐곡선 분석에 기초한 개방형 유전체 구조에서의 수정된 구동파형

교류형 플라즈마 디스플레이에서 Vt 폐곡선 분석에 기초한 개방형 유전체 구조에서의 수정된 구동파형

Analysis of Reset Discharge Characteristics in AC-Plasma Display Panel With Various Sustain Gaps Using $V_{t}$ Close-Curve

The effects of various sustain gaps on the reset discharge characteristics, particularly the discharge stability, are examined based on a Vt close-curve analysis. The Vt close-curve analysis shows that the reset discharge region producing a stable discharge under an MgO cathode condition is reduced in proportion to the increase in the sustain gap, resulting in discharge instability when a conventional reset waveform is applied with a wide-sustain-gap (over 200 mum) structure. Based on the Vt close-curve analysis, a modified reset waveform suitable for a wide-sustain-gap (= 200 mum) structure is proposed to prevent an unstable discharge. The effects of two parameters V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">add-bias</sub> and V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">com-bias</sub> in the modified reset waveform on the reset discharge as well as the address and first sustain discharges, are examined in detail.

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.

Study on discharge stability of cost-effective driving method based on V/sub t/ close-curve analysis in AC plasma-display panel

A new cost-effective driving method that can drive plasma-display panel cells without applying any driving waveform to the common electrode is proposed based on a V/sub t/ close-curve analysis. In this driving method, it is very important to prevent a misfiring discharge due to the inversion of the polarity of the wall charges accumulated between the scan and address electrodes. The measured V/sub t/ close-curve showed that a misfiring discharge caused by the polarity inversion phenomenon of the wall charges on the scan and address electrode could be prevented by minimizing the potential difference between the scan and address electrodes by applying a positive auxiliary pulse to the address electrode, especially while applying the positive sustain pulse during a sustain period. As a result, the proposed cost-effective driving method can reduce the driving cost by about 20% through eliminating the common driving board and successfully display various image patterns, such as the white, red, green, and blue patterns, on a 42-in plasma television without any misfiring discharge.

A new driving waveform for improving luminous efficiency in AC PDP with large sustain gap under high Xe content

A new driving waveform is proposed to improve the luminous efficiency of alternating current (ac) plasma display panel with a large sustain gap (400 /spl mu/m) structure under a high Xe (15%) gas mixture. Due to the large sustain gap structure, the reset waveform was modified based on Vt close curve analysis to produce the surface discharge between the scan and sustain electrodes by applying the negative bias voltage on the sustain electrode during a ramp-up period. During a sustain period, the sustain waveforms with two different voltage polarities, i.e., positive and negative voltage levels, were applied, thus resulting in producing an efficient discharge by accumulating the wall charges uniformly among the three electrodes. As a result of adopting the proposed driving waveform, the luminance of 330 cd/m/sup 2/ and luminous efficiency of 4.5 lm/W under the sustain voltage of 210 V and the trigger voltage of 160 V were obtained in the 6-in plasma display panel (PDP) with green phosphors under a large sustain gap (400 /spl mu/m) and a high Xe (15%) gas mixture.

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.

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.

26.3: A New Driving Waveform for Improving Luminous Efficiency in AC PDP with Large Sustain Gap under High Xe content

In the current paper, a new driving waveform is designed based on Vt close curve analysis and proposed to improve the luminous efficiency of AC plasma display panel with a large sustain gap (400 μm) structure under a high Xe (15 %) gas mixture. Due to the large sustain gap structure, the reset waveform was modified based on Vt close curve to produce the surface discharge between the scan and sustain electrodes with a negative bias voltage on X electrode while the rising-ramp waveform was applied on Y electrode. In addition, the sustain waveform is designed to produce the face trigger discharge between one of the sustain electrodes and an address electrode, and the main sustain discharge between the two sustain electrodes successfully, when applying the negative sustain pulse to one sustain electrode during the application of the positive sustain pulse to the other sustain electrode, thus resulting in producing an efficient discharge by accumulating the wall charges uniformly among the three electrodes. As a result of adopting the proposed driving waveform, the luminance of 330 cd/m2 and luminous efficiency of 4.5 lm/W under the sustain voltage of 210 V and the trigger voltage of − 160 V were obtained in the 6-inch PDP with green phosphors under a large sustain gap (400 μm) and a high Xe (15 %) gas mixture.