| 摘要 |
A method for driving a matrix viewing device displaying grey levels comprising a source of electrons at the crossing of line and column electrodes, consisting of applying a line selection voltage (Vls) on the line electrode and a voltage corresponding to the grey level on the column electrode. The grey levels are distributed into two families (F1), the first grouping the darkest grey levels, the second (F2) grouping the least dark grey levels. If the grey level belongs to the first family (F1), the voltage is pulse-width-modulated, if it belongs to the second family, the voltage is amplitude-modulated. The amplitude of the pulse-width-modulated voltage and the maximum amplitude of the amplitude-modulated voltage are reduced relatively to those required if the control was performed for all the grey levels by amplitude modulation or by pulse width modulation.
|
