The system utilizes a high frequency, high voltage plasma power source that requires only one electrode or an external
capacitive electrode for input to the plasma display discharge tube. The external capacitive effect greatly reduces the cost
in producing this plasma tube as no internal electrode or glass to metal seals are required. Also eliminated are any
grounds or electrical returns as required in conventional systems. Ignition of the plasma discharge now appears to occur
extending outwardly into space without a return connection. In actuality high frequency electrical currents are flowing thru
the capacitive reactance of the plasma tube with the surroundings where the glass enclosure acts as the dielectric between
the two. The user, by hand contact to the control pads, forms the other plate of this virtual capacitor. a frequency of approximately 200 KHZ.