One-dimensional fluid simulations of a helium - xenon filled ac colour plasma flat panel display pixel

Abstract

fluid simulations are used to model a helium-xenon filled ac plasma display pixel. The model includes four levels for helium atomic states, seven levels for xenon atomic states and a xenon dimer state. The model also includes VUV emission including photon trapping due to collisional broadening from the resonant atomic xenon at wavelengths of 129 nm and 147 nm and from non-resonant emission by the xenon dimer molecule peaked at 173 nm. Simulations are performed for a gap width (d ) of 100 microns at a pressure (P ) of 400 Torr using varying xenon concentrations. At low xenon concentrations, emission is primarily in the 147 nm wavelength but shifts toward the xenon dimer above about 20% xenon in the mixture. At 2% xenon, the calculated VUV emission is about 85% from the resonant atomic xenon state at 147 nm, about 13% from the dimer and about 2% from the resonant 129 nm line. Emission from the 129 nm line is insignificant due to collisional quenching of the xenon 6s states. The discharge efficiency, defined as the VUV photons/watt dissipated, increases with xenon content with an optimum at about 30% xenon. For opposed electrode geometry, as the xenon concentration is increased from 2% to X % xenon, the simulations show that the applied voltages scale approximately as (X /2) 1/4 . At a fixed Pd , a higher pressure yields more VUV emission than using a larger gap width.

Modeling of the microdischarges in plasma addressed liquid crystal displays

“…Since this approach has been described previously in numerous articles, [6][7][8][9][10][11][12][13][14][15][16][17] we will only outline it briefly here. Given the low ionization degree, the density and temperature of the gas particles are assumed to be constant and unaffected by the plasma.…”

“…͑18͒ represents the flux due to the electric field; the last two terms are the diffusion flux, due to the random motion of the particles. Most authors [8][9][10]15,17 apply Eq. ͑18͒ without the last term, which they wrongly ignore; this term reflects the fact that the random motion flux involves all particles within a certain mean free path from the wall, not just the local particles at the wall.…”

Three-dimensional fluid simulation of a plasma display panel cell

“…There have been many one-and two-dimensional numerical models of PDP discharges over the last a few years. [2][3][4][5][6][7] One-dimensional models are sufficient for simulating matrix-type PDP, [2][3][4] while the study of coplanar-type PDP requires at least two-dimensional modeling. [5][6][7] Because of its low speed, three-dimensional simulations are not common, though three-dimensional variations of the cell structure are widely performed in experiments.…”

Energy distribution of ions and fast neutrals in microdischarges for display technology

“…By the use of self-consistent fluid models, a good picture can be obtained of the electric fields and the particle densities and fluxes in microdischarges. [5][6][7][8][9] However, these fluid models do not describe the energy distributions of the plasma particles. In this work, we attempt to predict-on the basis of the results of fluid models-the energy distribution of ions and fast neutrals impinging on the surface.…”