Eliminating crosstalk in thin film transistor/liquid crystal displays

Abstract

One of the problems inherent in active matrix displays, which can prevent them from achieving gray-scale images of CRT quality, is crosstalk, whereby information is coupled along columns of the display. While alternating data voltages line by line can reduce such crosstalk, it requires a sacrifice of resolution in the displayed image. The authors have developed a scheme for reducing crosstalk by a cancellation technique based also on a change of drive waveforms, but producing no loss of resolution. This approach does, however, require a factor of two increase in bandwidth or switching speeds. The technique can be applied to all types of active matrix displays, including thin-film-transistor, MIM, and diode types.