Flat cathode ray tube display apparatus

A flat cathode ray tube display apparatus comprising a cathode ray tube having an envelope, a luminescent screen extending over a substantially flat faceplate, a deflection electrode array within the envelope extending parallel to the screen and comprising a plurality of individual deflector electrodes, a planar electrode spaced from the deflection electrode array and overlying the screen, means in the envelope for producing and directing a line scanning electron beam substantially parallel to the faceplate between the deflection electrode array and the screen, a drive circuit comprising a plurality of output stages each of which is connected to a respective electrode of the deflection electrode array, the deflection electrode array being operable by the drive circuit for deflecting the line scanning beam in a direction towards said faceplate in field scanning manner whereby the electron beam is scanned over the luminescent screen in a television raster fashion, characterized in that the deflection electrode array comprises one deflector electrode for each conventional standard raster line to be displayed, and in that the drive circuit is operable to switch the voltage applied to each deflector electrode from a first predetermined level to a second predetermined level in sequence so as to step the line-scanning beam in the field direction.