Results obtained with SIPDP-AC
In plasma display panels the light of each picture element is emitted from a plasma created by an electric discharge. The dimensions of the discharge are in the 100 micro-meters range at a pressure of a few hundred torrs, and the voltage applied between electrodes is in the 100-200 V range. In the simplest configuration, plasma display panels consist of two glass plates, each with parallel electrodes deposited on their surfaces. The plates are sealed together with their electrodes at right angles, and the gap between the plates is filled with a rare gas mixture. Each pixel at the intersection of a line and a column electrode can be illuminated independently when a voltage pulse is applied between the two electrodes. The voltage pulse leads to the breakdown of the gas and to the formation of a weakly ionized plasma which emits visible or UV light.
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| Simulated domain including one cell and two half cells |
In ac Plasma Display Panels the the electrodes are covered with a dielectric layer. We focus below on ac PDPs. The dielectric layers are coated with a magnesium oxide (MgO) layer. The role of the MgO film is to protect the dielectric layers and to decrease the discharge voltage due to the large secondary electron emission coefficient of MgO under bombardment by neon ions. Due to the charging of the dielectric, the discharge is transient and the pulse duration is on the order of 20 ns in typical conditions (xenon-neon 10-90 gas mixture at 600 torr).
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| Space and Time Variations of the Electric Potential and Xenon Excitation
in the Cell showing the plasma formation and expansion toward the cathode. The light emission is located at the plasma-sheath interface and moves toward the cathode as the sheath contracts. The plasma spreads on the anode side due to the charging of the dielectric surface. |
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| Current Density as a Function of Time |
: click here to watch a movie of the plasma formation in a PDP cell.
These results have been generated using the software SIPDP-AC from the SIGLO Series developed by Kinema Software in collaboration with J.-P. Boeuf & L.C. Pitchford at CNRS, CPAT, Université P. Sabatier. The results have been post-processed using Spyglass Transform.
References:
C. Punset, J.P. Boeuf, and L.C. Pitchford, "Two-Dimensional Simulation of an AC Matrix Plasma Display Cell. Cross-Talk and other Geometric Effects", J. Appl. Phys. 83, 1884 (1998)
J.P. Boeuf, C. Punset, A. Hirech, and H. Doyeux, "Physics and modeling of plasma display panels", J. Physique IV France7, C4-3 (1997)
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