1,720,966 research outputs found
Plasma display panel with Ne+N-2 gas-mixture discharges
No full textThe discharge characteristics of Ne+N-2 gas-mixtures were investigated for possible use in an ac Plasma Display Panel. The firing voltage increased with an increase in the N-2 concentration. When using a near ultra violet excited phosphor, (Ba,Sr)(2) SiO4:Eu, the luminous efficiency of Ne+10%N-2 gas-mixture discharges under 400 torr was about 20% better than when using the conventional phosphor. The UV intensity emitted from the gas discharges was found to increase with an increased N-2 concentration. Furthermore,. the UV efficiency increased with an increase in the N-2 partial pressure at a low N-2 concentration, yet became saturated at a high N-2 concentration
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)
Improvement in the luminous efficiency using ramped-square sustain waveform in an AC surface-discharge plasma display panel
No full textThis paper proposes a new sustain waveform to improve the luminous efficiency of an alternate current plasma display panel (AC-PDP). The new sustain waveform is a superimposed waveform, which adds a ramp-waveform to a square-waveform, and has an increasing voltage slope between the rising and falling edge. This waveform can induce a longer-sustained discharge at the rising edge plus a self-erasing discharge at the falling edge, thereby improving the luminous efficiency. When compared with the conventional square sustain waveform, the proposed sustain waveform with a 9.3 V/mus voltage slope achieved a 65% higher luminous efficiency in a 4-in AC-PDP test panel even at a low frequency (62 KHz).This
work was supported by the Brain Korea 21 Project in 2001
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
Case studies on temperature-dependent characteristics in AC PDPs
No full textThe temperature-dependent characteristics of ac plasma display panels (PDPs) are investigated, based on various case studies using a conventional driving scheme with reset pulses. Though the main factor of the thermal effects is caused by strong sustain discharges, it is not only caused by the panel characteristics, but also by the temperature-dependent characteristics of the driving system. One important thermal effect is a decreased breakdown voltage due to an increase in the panel temperature. Therefore, these results may be helpful in solving image-sticking and temperature-related phenomena.This work was
supported by the Basic Research Program of the Korea Science and Engineering
Foundation under Grant R08-2003-000-10376-0
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