Dynamic modeling of liquid crystal display cells using a constant charge approach

We present a new formulation for the dynamic modeling of twisted nematic liquid crystal display cells based on a constant charge assumption instead of the commonly used "fixed voltage" model. This formulation is based on a tensor representation of the director field, which is solved using a combination of finite-element and finite-difference methods. It allows the accurate modeling of liquid crystal pixel cells in thin-film-transistor-driven active matrix displays, extensively used in flat panel computer and television displays.