Reduction of effects caused by imbalanced driving of liquid crystal cells

摘要

A method of operating a liquid crystal cell during a given period of time without requiring DC-balancing of the cell includes the step of applying image producing electric fields to the cell during a first portion of the given period of time. The method uses input image data to control how the cell is operated and the image producing electric fields depend in a predetermined way upon the input image data. The method further includes the step of applying additional electric fields to the cell during a second portion of the given period of time. In this method, the image producing electric fields and the additional electric fields are such that the cumulative time integral of the electric fields that are present in one direction across the liquid crystal material is not substantially equal to the cumulative time integral of the electric fields that are present in the opposite direction during the given period of time during the operation of liquid crystal cell. Also, the additional electric fields are electric fields configured to reduce the amount of image sticking caused by the image producing electric fields compared to the amount of image sticking that would occur if only the image producing electric fields were applied to the cell during the given period of time.