Frispel
sedan 2001
A Planar Gas Discharge or Plasma Display Panels (PDP) display utilizes the same principle the Nixie tube does. It's construction consists of sandwiching a hollow center layer filled with neon and a small amount of mercury between a glass front and a ceramic back. A thick conductive paint forms the Cathodes on the inside of the ceramic back. The Cathodes form the segments of each digit. Each digit is covered by a separate Anode that is deposited on the inside of the glass front. The Anodes are formed from a thin transparent layer of tin oxide. When a sufficient voltage is applied between a cathode segment and it's anode, the gas around the cathode segment breaks down and begins to glow. Like the Nixie tube, the digits glow with a orange-red color. Voltage requirements for these displays are typically 180-200 volts DC).