ACTIVE MATRIX DISPLAY DEVICES AND METHODS OF DRIVING SUCH

摘要

An active matrix display device of the kind having two terminal non-linear switching devices (15) such as thin film diodes connected in series with the electro-optic, e.g. LC, display elements (12) between associated row and column address conductors (16, 17), in which the display elements are driven using pulse width modulated data signals and a wide range of grey-scale levels is achieved by using selection signals whose form is determined such that the current flow through the switching devices upon selection is controlled in an appropriate manner. To this end, the selection signals can be shaped to provide a more constant charging level over the selection period.