等离子体平板显示器放电特性的数值模拟

【作者】 杨兰兰；

【导师】 屠彦；

【作者基本信息】 东南大学 ， 物理电子学， 2003， 硕士

【摘要】 本论文从PDP(plasma display panel)的放电机理出发，利用流体模型编制了PDP放电的数值模拟软件。该软件可以对传统的对向放电式、表面放电式以及新型荫罩式PDP结构的放电过程进行数值模拟，从理论上对彩色PDP显示单元的放电特性进行分析研究。在本文中，分别使用本地场近似的LFA(local field approximation)流体模型和假设碰撞反应系数、传输系数和电子的平均能量相关的EME(electron meanenergy)流体模型对PDP放电过程进行模拟，比较分析模拟结果，得出EME模型和LFA模型对放电的繁流、起辉放电、熄灭等过程的描述的基本趋向是大致相同的，而从模拟工作电压与实际电压的接近程度和放电效率角度比较，EME模型的模拟结果跟理论和实验结果更为相符。使用EME模型模拟计算新型荫罩式结构和传统的表面放电式结构，对这两种结构的模拟结果进行比较分析。模拟结果表明，在相同的模拟工作电压下，荫罩式结构中的各种粒子的平均浓度均比表面放电式结构提前达到峰值，且平均浓度的最大值比表面放电式高，放电效率也高于表面放电式结构，这意味着新型荫罩式结构的亮度高，响应频率快。对新型荫罩式结构分析了单元结构的变化对电子平均温度和放电效率的影响，并观察了随压强的变化电子平均温度的变化趋势，模拟结果表明斜边或弧状的内斜式结构可提高放电效率，且电子温度随压强的变化趋势同文献相符。更多还原

【Abstract】 Plasma display panel (PDP) is one of the leading technologies for large-area high-brightness flat panel displays. As the size of the discharge cell is very small, it is difficult to measure the physical quantities such as the density and the temperature directly. Computer simulation has become a useful tool to understand the discharge characteristics in the display cell.Among the numerical simulations, fluid model has been used widely. Two fluid models are presented in this paper: LFA(local field approximation) and EME(elctron mean energy). LFA model does not take into account the electron energy redistribution due to thermal conduction and convection and assumes the transport and rate coefficients are the functions of the reduced field. Recently, non-LFA model, such as EME model, has been used to improve the fluid simulations of gas discharge. In the EME model, the electron energy balance equation is taken into account and the transport coefficients are assumed to be the functions of the electron mean energy.In this paper, a software is programmed to simulate the discharge process of plasma display cell of coplanar-electrode type, the matrix-electrode type and the novel shadow-mask PDP according to the gas discharge mechanism and fluid simulation theory.The simulation results show that both LFA model and EME model can be used to investigate the discharge characteristics of the cell, but the EME model is preferred for its better coincidence with theories and experiments. With non-synchro method, the calculation time of EME model is greatly reduced. The variation with the time of the mean density of all particles, electron temperature and their space distributions in the discharge cell are calculated in this paper.The characteristics of shadow-mask PDP are compared with those of coplanar-electrode PDP by EME model. The result shows that the shadow-mask PDP has many advantages, such as the greater mean value of the particle densities, the higher response speed and discharge efficiency. Moreover, how to optimize the cell structure of shadow-mask PDP has been investigated. The influence of the height,width and the shape of the metal barrier is calculated in this paper. The simulation results show that the shape of the barrier boundary has great influence on discharge efficiency. The variation of electron temperature with gas pressure is also investigated and its result is coincident with the recorded data.更多还原