DC plasma has been popular for many years as the media for digital displays. DC plasma provides a relatively bright display ideal for panel meters and various types of test equipment. Numerical 7-segment displays are used in most cases, and therefore the display drivers for de plasma are configured specifically for this application. DC plasma displays require a rather high voltage to fire (ionize) the gas and maintain conduction. Firing voltages are generally in excess of 100 V and operating current levels are from
0.2 mA to 3 or 4 mA depending on the display’s physical size and the brightness required. Multiplexing may be used in some applications to minimize the number of parts required.