1,720,965 research outputs found
The effect of the discharge aging process on the surface state of MgO film in AC PDPs
No full textThis paper reports on the change in the surface condition of the MgO thin film in an ac plasma display panel during the discharge aging process. The superficial layer on the MgO thin film was created during the discharge aging process, which was related to the minimum sustain voltage and the light intensity emitted from the Neon+Xenon gas mixture discharge. The superficial layer on the MgO thin film was observed using a transmission electron microscope. The X-ray diffractometer pattern of the MgO thin film after the discharge aging process was different from the pattern at the beginning of the discharge aging process.This work was
supported by Sejong University under the IT Research Center Projec
Characteristics of a wall voltage during sustain period in AC plasma display panels
No full textAccording to the viewpoint of a driving scheme, the luminance and luminous efficiency is mainly determined during the sustain period. Therefore, it is very important to understand the characteristics of the wall voltage during the sustain period, which is essential to design the driving pulse scheme. In this study, the quantitative analysis of the wall voltage has been carried by the wall voltage measurement method during the sustain period. The initial difference of the wall voltage is sharply stabilized due to the sustain discharges and it is mainly determined by the sustain voltage. The wall voltage between the sustain electrodes is changed symmetrically for the reference voltage level, while the wall voltage between the address and sustain electrode is positively sustained which is roughly mean value of the total effective voltage.This
work was supported by the Basic Research Program of the Korea Science and
Engineering Foundation under Grant R08-2003-000-10376-1
Effects of pre-reset conditions on reset discharge from ramp reset waveforms in AC plasma display panel
No full textThe basic characteristics of reset discharges related to a wall voltage and a priming effect were investigated under a conventional ramp driving scheme. The reset discharges could be minimized by controlling the wall voltage which is determined by pre-reset conditions. Accordingly, the current study presents a simple pre-reset condition for minimizing the reset discharge. Essentially, it is not only to reduce the duration of reset discharges but also to reduce the intensity of light emissions when the wall voltage polarity is opposite to the external voltage polarity.This work
was supported by the Research Program of the Korea Science and Engineering
Foundation under Grant R08-2003-000-10376
Dependence of a wall voltage variation on priming effects during a reset discharge in AC plasma display panels
No full textThe characteristics of a wall voltage driven by ramp pulses have been investigated in terms of priming effects in an ac plasma display panel. The effective firing voltage is decreased due to the priming effects of ramp discharges, and the resultant wall voltage is relatively larger compared to the conventional prediction.This work
was supported by the Korea Research Foundation under Grant D00041(R08-
2004-000-10376) from the Basic Research Program
Investigation of wall and space charges decay using pulse technique in AC plasma display panel
Full text linkUsing simple pulse technique, two kinds of cases in alternating current (ac) plasma display panel were investigated. One is the relationship between the wall charge decay and the discharge aging time. The other is the relationship between space charge decay and the application of pulse to the address electrode during sustain period. For the former case, the minimum sustain voltage depended on the priming particles within a short time range (100 mu s) of afterglow, then suddenly increased as the afterglow time increased. With a long time range (600 mu s) of afterglow, the minimum sustain voltage depended on the state of the wall charges and gradually increased as the afterglow time increased. From these results, a time scale for the wall charge decay was obtained as a function of the discharge aging time. For latter case, the space charge decay time was 5 mu s when there are no pulses applied to the address electrode. The space charge decay time was about 4 mu s due to the application of pulses to the address electrode
Characteristics of an address discharge in ac plasma display panels
Full text linkIn this study, the basic characteristics of an address discharge have been investigated on the dependence of an address pulse voltage and its characteristics were analyzed by the wall voltage measurement method. During the address operation, the discharge between an address electrode and a scan electrode is first generated by an address pulse voltage and then the discharge between a scan electrode and a common electrode is induced. The resultant wall voltage between the address electrode and a scan electrode is strongly dependent on an address pulse voltage while the resultant wall voltage between a scan electrode and a common electrode is roughly independent on an address pulse voltage.This work was
supported by the Korea Research Foundation Grant funded by the Korean Government
(R08-2003-000-10376-1)
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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