VERFAHREN UND VORRICHTUNG ZUR KONTRASTEINSTELLUNG BEI UNTERRAHMENGESTEUERTEN BILDANZEIGEN

摘要

The invention relates to a method and a device for contrast control in impulse-bandwidth controlled picture displays such as plasma displays. With this type of display the time interval available for displaying a picture is divided into several consecutive partial time intervals and the luminance signal assigned to a picture element is generated by transforming an analogue luminance value into a predetermined number of voltage pulses present during one or more of the partial time intervals. If the contrast is changed the predetermined number of voltage pulses which can be generated in each of the partial time intervals is modified.