METHOD AND APPARATUS FOR ACTIVATING A LIQUID CRYSTAL DISPLAY

摘要

A method and circuit for activating a liquid crystal matrix display panel in which during each selecting period, each liquid crystal cell pixel of the matrix, whether selected or unselected, receives either a primary selecting signal voltage or non-selecting signal voltage as well as an additional different secondary voltage to generate substantially homogeneous crosstalk noise over the entire display. The signal voltage applied to a pixel during a selecting period can vary between a primary selecting or non-selecting voltage applied for a first time interval followed by or preceded by a secondary voltage intermediate the selecting and non-selecting voltage applied for a second interval. Alternatively, the primary signal voltage applied to the pixel for a first time interval can be a selecting or non-selecting voltage and secondary voltage applied for a second time interval can be the other. In another embodiment of the invention, the relative duration of the primary and secondary voltages affects the darkness gradation of the display.