Automatic extraction of an equivalent circuit from a TFT-LCD unit cell for LCD TV application

In this article, we present a novel scheme for automatic generation of an equivalent circuit for unit cell of LCD-TV. In order to automatically extract a circuit model, a computer program generates an electrical connectivity of resistors and capacitors from the layout information through a so-called pattern analysis with electrode and port information. Thereafter, the Ericksen-Leslie's equation and two types of Laplace's equation in the dielectric and conductor domain are solved by finite element method (FEM). Finally, we can obtain a resistive equivalent circuit and a capacitive equivalent circuit in an independent manner. For combining two types of independent equivalent circuits, we propose a node insertion algorithm which enables us to generate an equivalent RC circuit without increasing the capacitive elements.