The mechanism of high luminous efficiency discharges with high Xe content in an AC plasma display panel was analyzed by computer simulation using a two-dimensional fluid model. The model has reproduced well the experimental results. The high luminous efficiency with high Xe content is attributed to high electron heating efficiency as well as high excitation efficiency by electron. The electron heating efficiency is increased with increasing the sustaining voltage under high Xe content and this phenomenon was analyzed by investigating the cathode sheath and secondary electron emission characteristics.
"In many fields, such as cell structures, gas mixtures, sustaining waveforms, etc., a lot of efforts have been dedicated to improving luminous efficacy. The easiest way to achieve high luminance and efficacy is to increase the Xe content in a gas mixture . Although increasing the Xe content has the drawback to raise the driving voltages, it can be applied without changing the driving waveforms and cell structures. "
[Show abstract][Hide abstract] ABSTRACT: 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 ( T <sub>on</sub>) and the time interval between successive sustaining pulses ( T <sub>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 T <sub>on</sub> time was a dominant factor in the negative-going pulse waveform, while the T <sub>off</sub> time was more important in the positive-going pulse waveform.
IEEE Transactions on Electron Devices 01/2010; 56(12-56):3218 - 3222. DOI:10.1109/TED.2009.2033166 · 2.47 Impact Factor
"Experimental results have shown that, unlike positive sustain waveforms, negative sustain waveforms can produce a fast discharge ignition and intensive vacuum ultraviolet (VUV), thereby improving the discharge characteristics of PDPs. Therefore, since a high Xe gas chemistry and large sustain gap have already been investigated to improve the luminous efficiency of current PDPs –, negative sustain waveforms also need to be seriously considered . Accordingly, this paper examined the discharge characteristics induced by a negative sustain waveform and then compared them with those induced by a conventional positive sustain waveform. "
[Show abstract][Hide abstract] ABSTRACT: The discharge characteristics produced by a negative sustain waveform were examined in comparison with those produced by a positive sustain waveform. An image-intensified charge-coupled device (ICCD) revealed that the negative sustain waveform produced a faster and stronger sustain discharge than the positive sustain waveform. Simulation results also showed that the fast and strong sustain discharge produced by the negative sustain waveform was induced due to the rapid acceleration of the negative wall charges, such as electrons, when applying the negative sustain waveform directly to the electrode with negative wall charges, such as electrons. As a result, the luminance and luminous efficiency were both improved by about 14% and 13%, respectively, with a negative sustain pulse of -180 V when compared to the results with a positive sustain waveform of 180 V.
IEEE Transactions on Electron Devices 11/2008; 55(10-55):2595 - 2601. DOI:10.1109/TED.2008.2003227 · 2.47 Impact Factor
"However, some of the space charge remained alive during an application of the voltage pulse . In addition, there were generally more ions in the discharge space because the electron mobility was much higher than the ion mobility . Thus, the remaining space charges after the discharge extinction were mostly ions. "
[Show abstract][Hide abstract] ABSTRACT: The three-electrode microdischarge characteristics of ac plasma display panels are analyzed with a wide-sustain-discharge gap of 180 mum. In particular, the luminance and consumed-power variations are examined as parameters of the operating frequency. It is found that the luminance per unit pulse decreases, and simultaneously, the consumed power per unit pulse increases with an increase in the operating frequency. For the wide-gap structure, the sustain voltage increases when increasing the operating frequency, thus causing the power consumption per unit pulse to be increased. However, the luminance per unit pulse decreases when increasing the sustain voltage, even though the power consumption per unit pulse increases with the sustain-voltage increase. As a result, it is observed that the self-erasing discharge between the sustain and address electrodes caused by the short pulsewidth under high frequency affects the luminance and consumed power. Due to the self-erasing discharge, the sustain voltage increases, and the discharge shrinkage phenomenon affecting the luminance characteristics occurs under high frequency that is up to 200 kHz with a wide-sustain-discharge gap of 180 mum.
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