Plasma is a display technology for thin flat display devices usually used for large TV screens. Plasma screen pixels are small cells sandwiched between two layers of glass that contain gases, which when electrically charged excite phosphors in the cell to emit light. Plasma displays should not be confused with LCDs, another lightweight flatscreen display using different technology.
Plasma displays are bright, have a wide colour gamut, and can be produced in fairly large sizes - currently up to approximately 150 inches (measured diagonally).
They have a very low-luminance "dark-room" black level compared to the lighter grey of the unilluminated parts of an LCD screen.