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This paper describes a novel waveform which improved the luminance efficiency of AC‐PDP without reducing the voltage margin. This waveform which induces self‐erase discharges by space charges, utilizes the memory effect of space charges like the puke memory of DC‐PDP, in addition to the memory effect of wall charges. More than a 15% higher efficiency is obtained in the 40‐inch diagonal XGA AC‐PDP developed by us when compared with the conventional waveform at the same operating point.

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MoleCoolQt is a molecular viewer designed to be a useful tool for charge-density science. Features include the visualization of local-atomic coordinate systems in multipole refinements based on the Hansen and Coppens formalism [1]. Residual peaks and holes show up next to the atoms of the asymmetric unit if they are calculated by the refinement software. Critical points from the topological analysis of the charge density could also show in the structure visualization. Color-mapped iso-surfaces like in Moliso [2] can be generated with an easy to use user interface. Beside of its visualization features it interactively helps the user in assigning local coordinate systems and local symmetry for the multi-polar refinement. It can automatically detect the local symmetry, but the user can easily reduce symmetry on demand. Dummy atoms are calculated and inserted into the model. When using data bases, rarely occurring Invariom [3], [4] name assignment problems can be solved by the use of an interactive dialog. Currently only the XD [5] package is fully supported, but other programs will follow in future. Currently the subsequent file formats are supported: XD, SHELX, GAUSSIAN (com, FChk, cube), CIF, PDB. MoleCoolQt is written in C++ using the Qt library, has an user friendly GUI and is available for several flavors of Linux and Windows. A Mac version is currently being tested. After its final release it will be licensed under GPL. Since November 2009 test versions can be downloaded at http://www.molecoolqt.de after registration.

We apply V-Q Lissajous' figure for the discharge measurements of ac PDPs (Plasma Display Panels) which have the electrodes covered with dielectric. From measuring the V-Q Lissajous' figure, we can know the wall voltage and the voltage between the discharge gap. We can also know the sparking voltage and extinction voltage. We compare the PDP discharge, which occurred at fast rise time applied voltage, and ozonizer discharge, which occurred at slow rise time applied voltage. Then we know that the discharge phenomena of PDPs, which sparking voltage is very high and extinction voltage is very small, is completely different from that of ozonizer discharge, which gap voltage is kept constant, the sustain voltage V*. From the point of view, we propose noble discharge model for ac-PDPs.