ACEL矩阵屏的拓扑与容抗特性

交流矩阵显示屏在直流脉冲驱动过程中存在“交叉效应”问题,其原因在子象元点之间电容互相耦合作用.分析并定量计算这种耦合作用,以及确定备象元上的电压分布关系,对于改善图象质量、降低电源功耗有着重大意义.本文提出一个三维拓扑结构来模拟交流矩阵屏.避过分折该拓扑中节点与支路关系,推导出直流脉冲驱动时各种情况下屏的等效电容计算公式和象元电压分布公式.文章所提出的公式简单、直观、严格,并给出了证明.这些公式对指导此类屏的驱动电路设计具有一定意义.

THE TOPOLOGY AND CAPACITANCE OF ACEL MATRIX SCREENS

The "Cross-over" effect is usually observed in the case of DC impulse driving ACEL (alternating current electroluminescence) matrix screen, because of the image-element capacitors crossed-coupling. On a panel of the screen,one picture may be displayed by number ways,but the DC power consumed and picture quality are changed greatly. The most important reason of this behaviors is the crossed coupling of the capacitors. Accurate calcula-tion of the equivalent capacitors and the voltages of image-elements are very important to improve the image quality and reduce the power consumption. This paper gives a new three dimention topology as analogue of the ACEL matrix screen. With the topology, also a plain and strict, way is offered to calculate the equivalent capacitors and the distribution of image-element voltages for ACEL matrix screens.