Cathode ray tube of the index tube type

A picture display device comprising a cathode ray tube (1) having means (5) for generating at least one electron beam, a display screen (10) provided with a phosphor pattern comprising phosphor elements luminescing in different colours and index elements inside an evacuated envelope, and means (9) for deflecting the electron beams across the display screen over the phosphor elements and over the index elements, scanning the electron beam in a direction parallel to the phosphor elements and having means for moving the electron beam in a direction perpendicular to the phosphor elements and imparting video information to the means for generating the electron beam, the picture display device comprising receiving means (12) for receiving data emanating from the index elements, and a deflector means for controlling the deflection of the electron beam(s) in response to said data in a direction transverse to the phosphor elements, characterized in that the display device comprises an electron gun having a main lens portion, and the deflector means comprises at least two electrostatic deflectors (41, 42) positioned in front of the main lens portion (DML), said electrostatic deflectors having opposite effects.