SPICE Model Implementation of Parasitic Capacitances for Pixel Signal in AMLCDs

초록

In this paper, we report a novel method for extracting SPICE model for a unit cell of AMLCD. We investigated the influence of the parasitic capacitance on a pixel voltage drop of AMLCD. In this work, we generated a SPICE model for a unit cell of TFT-LCD by taking all of parasitic capacitances into account. In order to calculate the capacitance, we employed a finite element method. We calculated 21 capacitances including LC capacitance as a function of the applied voltage. In order to generate a SPICE model for LC capacitance, we used a piecewise linear voltage-controlled capacitor model with calculated values. Especially, we found that the parasitic capacitances and increase the voltage drop of the pixel electrode while the capacitances and decrease the voltage drop of the pixel electrode. Furthermore, the waveform of made the fluctuations of pixel signal while that of compensates those fluctuations.