Modular Plasma Display: Tubes coated on their inner surfaces with red, green, and blue phosphors are lined up, with crisscrossing display and address electrodes in front of and behind them. When current flows through a pair of electrodes at any intersection point, the charge causes gas in the tube to emit ultraviolet light, which in turn makes the phosphor coating glow. Each intersection point is a subpixel; corresponding segments of three tubes form a full pixel.